U.S.S. GUITARRO (SS-363) — war patrol report SS-363_GUITARRO.pdf

— page 1 —
START OF REEL
JOB NO. [HANDWRITTEN: 7-108]
[HANDWRITTEN: AR-125]
[HANDWRITTEN: SS GUITARRO (55-363)]
OPERATOR [SIGNATURE: R. M. Murray]
DATE [HANDWRITTEN: 7-10-78]

1.0
1.1
1.25
1.4
1.6
2.8
3.2
3.6
4.0
2.5
2.2
2.0
1.8

THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

[SEAL: DEPARTMENT OF DEFENSE, UNITED STATES OF AMERICA]

MICROFILMED BY
NPPSO-NAVAL DISTRICT WASHINGTON
MICROFILM SECTION

REEL TARGET - START AND END
NDW-NPPSO-521/1 (6-78)

— page 2 —
[HANDWRITTEN: G-GUITARRO (SS-363)
WWII PATROL FILE
ALL MATERIAL ON THIS REEL IS DECLASSIFIED
FOR DECK LOG JANUARY 1944 - DECEMBER 1945
CONSULT NATIONAL ARCHIVES WHICH HAS CUSTODY

J.A. KOONTZ]

— page 3 —
Dictionary of
American Naval
Fighting Ships

VOLUME III • 1968

NAVY DEPARTMENT

OFFICE OF THE CHIEF OF NAVAL OPERATIONS

NAVAL HISTORY DIVISION • WASHINGTON

— page 4 —
coast of Luzon. She commenced her approach to the lead
escorts of a large convoy 7 August and after missing
the first target scored three hits on frigate
blowing off her bow and sinking her in a spectacular
explosion. The remainder of the convoy and
Guitarro eluded the determined attacks of an escort
destroyer. She surfaced the next day to sink a small
coastal vessel with her deck gun, and then steamed
toward Cape Bolinao, where she was to rendezvous with
Raton the next day.
Guitarro detected a convoy along the coastline 10
August, maneuvered from beachside, and fired four
torpedoes. Tanker Shinei Maru exploded and burned
furiously as Guitarro dived to avoid depth charges. The
submarine suffered considerable outside damage but no
serious injury, and she departed for the vicinity of Cape
Calavite with Raton. While submerged the morning of
21 August Guitarro heard a distant depth charge attack,
and soon sighted the smoke of a convoy. Hampered by
an unfavorable current and a radically maneuvering
convoy, she was unable to mount an attack on two tankers;
but a cargo ship turned into her and received four
torpedoes. Passenger-cargo ship Uga Maru was sunk.
and Guitarro escaped amid a violent depth charge attack.
The versatile submarine, finding the water too shallow
for a torpedo attack, surfaced 27 August to engage three
coastal tankers with her deck gun and succeeded in
sinking Nanshin Maru. To other tankers were damaged
but managed to escape into shoal water. Guitarro re-
turned to Fremantle to complete her patrol 8 September
1944.
In company with Bream, Guitarro departed Fremantle
8 October 1944 for her third war patrol in Philippine
waters. As the epochal Battle for Leyte Gulf developed,
Guitarro played an important role. She sighted the Jap-
anese Central Force under Admiral Kurita on the night
of 23 and 24 October and tracked the ships through
Mindoro Strait, unable to close for an attack. Her con-
tact reports on the force were vital to the success of the
ensuing engagements, which by 26 October resulted in the
virtually elim-
inated the Japanese naval forces in the Pacific.
Guitarro, Bream, and Raton rendezvoused 30 October
and she observed
that night. Unable to score any hits until the next day
Guitarro managed to work her way inside the screen and
fire no less than nine torpedoes at 0847. She observed
one cargo ship break in half and was rocked 50 feet by the
mendous explosion from another direct hit on an ammu-
nition ship. Guitarro was driven down 500 feet by the
force of the explosion, prompting Comdr. Haskins to re-
port: "The Commanding Officer never wishes to hit an
ammunition ship any closer than that one." She teamed
up with Bream and Ray 4 November to sink passenger-
cargo ship Kagu Maru. After Bream's initial attack,
Guitarro added four hits before diving to avoid escort
vessels.
Remaining off western Luzon, Guitarro and her wolf
pack next encountered cruiser Kumano in convoy. Dam-
aged in the Battle off Samar, the cruiser had been repaired at
Manila and was en route to Japan when the submarines
struck. Guitarro fired nine torpedoes and gained three
hits, but failed to sink the cruiser. Pounded by torpedoes
from the other boats, Kumano was finally finished off
ashore by one of her sisters, and eventually towed
by carrier aircraft 25 November 1944. Guitarro, mean-
while, had returned to Fremantle 16 November. For her
outstanding performance on her first three patrols, the
submarine was awarded the Navy Unit Commendation.
Guitarro departed Fremantle 11 December 1944 on her
fourth war patrol, transiting Lombok Strait 17 December
to patrol the South China Sea. After putting in at Mios
Woendi 17 January 1945 for repairs, she made an attack
with undetermined results on a convoy off Cape Batagan.
Finding targets scarce, she returned to Fremantle 15
March.
The hard-working submarine again put out to sea 9
April on her fifth war patrol, and was unsuccessfully at-
tacked by aircraft and a patrol boat in Lombok Strait.

Guitarro

A ray of the guitar-fish family.

(SS-363): dp. 1,526 t. 311'9"; b. 27'3"; dr. 15'3"; s. 20
k.; cpl. 60; a. 1 3", 10 21" tt.; cl. Balao)

Guitarro (SS-363) was launched 26 September 1943 by
Manitowoc Shipbuilding Co. of Manitowoc, Wis.; spon-
sored by Mrs. Ross T. McIntire, wife of the Chief of the
Bureau of Medicine and Surgery; and commissioned
at Manitowoc 26 January 1944, Lt. Comdr. E. D. Haskins
in command.
Guitarro departed Manitowoc for Chicago 13 February,
and there she was placed in a floating drydock. Steamer
Minnesota towed to the drydock to New Orleans, arriving
22 February, and steaming from New Orleans 1 March, she operated out
of Balboa, Canal Zone, for several weeks and departed
for Pearl Harbor 2 April 1944.
Arriving at Pearl Harbor 17 April, Guitarro prepared
for her first war patrol off Formosa. She got under-
way on this duty 7 May 1944. On the night of 30 May
the submarine encountered heavily escorted cargo vessel
Shisen Maru, and scoring two hits sent her to the bottom.
She evaded counter-attacks by the screen ships and headed
south with a wolf pack of four submarines under the command
of Comdr. F. W. Fenno. On the night of 2 June Guitarro
made a moonlight periscope approach and fired two
torpedoes at frigate Awaji, sinking her immediately. The
submarine was then forced down to avoid depth charges,
torpedo, and aircraft attacks. She returned to Darwin,
Australia, 19 June, and 2 days later sailed for Fremantle,
arriving 27 June 1944.
Departing on her second war patrol 21 July 1944,
Guitarro set course for the South China Sea off the west

— page 5 —
She then made her way to the northeast coast of Sumatra,
where she engaged in a new mission, the laying of mines,
off Berhala Island. After an uneventful patrol astride
the shipping lanes between Borneo and Singapore,
Guitarro anchored off Saipan 27 May 1945. Next day
she departed for Pearl Harbor, where she arrived 8 June.
Arriving at San Francisco 18 June 1945, Guitarro de-
commissioned at Mare Island 6 December and was placed
in reserve. The veteran submarine recommissioned 6
February 1952, and after overhaul at San Diego engaged
in a series of training exercises off the coast until 10
September 1953. She again decommissioned 22 September
1953 for conversion to snorkel equipment at
Mare Island Shipyard. Guitarro subsequently recommis-
sioned 15 May 1954 and commenced the training of
Turkish sailors prior to transfer to Turkey under the
Military Defense Assistance Program. Guitarro decom-
missioned and was loaned to Turkey 7 August 1954 where
she now serves as Prevese (S-22).
Guitarro was awarded four battle stars and a Navy
Unit Commendation for her service in World War II.
Her first, second, third, and fifth war patrols were desig-
nated successful.

— page 6 —
[HANDWRITTEN: 1ST COPY]

SS363/A16-3
Serial 03
DECLASSIFIED

U.S.S. GUITARRO,
% Fleet Post Office,
San Francisco, Cal.

27 June 1944.

From: The Commanding Officer.
To : The Commander in Chief, United States Fleet.
Via : Official Channels.

Subject: U.S.S. GUITARRO, Report of War Patrol Number ONE.

Enclosure: (A) Subject Report.
(B) Track Chart (original only).

1. Enclosures (A) and (B), covering the first war
patrol of this vessel conducted in the area around FORMOSA
during the period 7 May 1944 to 27 June 1944 are forwarded
herewith.

[SIGNATURE: E. D'H. Haskins]
E. D'H. HASKINS.

[STAMP: DECLASSIFIED]
[HANDWRITTEN: BY OP-09B-2]
[HANDWRITTEN: NND-ART. 0445, OPNAVINST 5510.1C]
[HANDWRITTEN: 988 DATE 5/30/22]

[STAMP: DECLASSIFIED]
[HANDWRITTEN: 8 03513]

[HANDWRITTEN: 83408]

— page 7 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.
(A) PROLOGUE.

     Arrived PEARL from BALBOA, C.Z. on 17 April 1944.
     Two days were allotted for voyage repairs, and a two
     week training program carried out. During the train-
     ing and loading periods APR equipment, new type oil
     rings and expanders for GM (278A) engines, and com-
     plete charging panels for MK.18 torpedoes were
     installed.

     Sound tests and deperming were accomplished.

     Ready for sea and departed PEARL on 7 May 1944,
     with a full load of Mark 18 Mod. one torpedoes.

(B) NARRATIVE.

                                   7 May

     1300 (VW) Underway from SUBMARINE BASE, PEARL HARBOR, T.H.,
               for FIRST war patrol in accordance with COMMANDER
               TASK FORCE SEVENTEEN operation order No. 155-44.
               Met escort PC-752 at entrance buoys.

     2030 (VW) Released escort and made trim dive.

                                   8 - 11 May

               Enroute PEARL to MIDWAY. Conducting training
               dives and drills. Sighted five friendly planes.

                                   11 May

     0545 (Y) Sighted MIDWAY islands.
     0740 (Y) Moored at Submarine Pier, MIDWAY.
     1530 (Y) Underway from Submarine Pier, MIDWAY, having safety
               tank filled with fuel.
     1800 (Y) Escort planes departed.

                                   12 May

               Crossed international date line and omitted this
               day from calendar.

                                   13 - 18 May

               Training dives and drills enroute patrol area.
               On 17 May sighted and exchanged calls with USS
               PAPACON homeward bound.

                                   - 1 -                               ENCLOSURE (A)

— page 8 —
CONFIDENTIAL
U.S.S. CUITARRO, Report of First War Patrol.

19 May

1242 (K) Sighted masts bearing 310°T (Ship Contact #1), and
          dived. Nothing could be seen through periscope so
          ten minutes later surfaced, bent on four engines
          and headed toward, assuming we had been the over-
          taking vessel. Finally at
1325 (K) Sighted an object bearing 210°T on the horizon, so
          changed course 100° and pursued on four engines.
          Never again sighted anything although the visibility
          remained good. Reached the conclusion we had
          sighted a vessel making more than eighteen knots
          on a normal course to ours, so at
1525 (K) Broke off the chase and resumed westerly course.

20 May

0434 (K) Dived.
2002 (K) Surfaced. Passing through NANPO SHOTO.

21 May

0455 (K) Dived.
2032 (K) Surfaced. Passing through NANPO SHOTO.

22 - 23 May

          We are now west of NANPO SHOTO proceeding to
          station on the surface.

24 May

0400 (H) Crossed 130th Meridian East and entered patrol area.
          Patrolling on surface heading for SAKISHIMA GUNTO.

25 May

0415 (H) Dived. Passing to east of MIYAKO RETTO and headed
          up to northwest.
2026 (H) Surfaced and headed west toward the northern tip
          of FORMOSA.

26 May

0505 (H) Dived.
1414 (H) Sighted unidentified aircraft (Plane Contact #1)
          bearing 265°T distance 10 miles.
1947 (H) Surfaced and continued westward.

          - 2 -                               ENCLOSURE (A)

— page 9 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.

27 May

0001 (H) Sighted two white lights later identified as naviga-
          tional lights at SANCHO KAKU, east coast of FORMOSA.
0405 (H) Dived and headed up the coast. Patrolled fifteen
          miles off KIRUN HARBOR.
1205 (H) Sighted motor sampan (Ship Contact #2) which was
          patrolling off the harbor. We are now in the area
          and wish to keep our presence undetected until some-
          thing big comes along.
2049 (H) Surfaced. Headed down east coast of FORMOSA while
          heading for rendezvous with PICUDA.

28 May

0415 (H) Dived.
1924 (H) Surfaced and continued toward rendezvous point.

29 May

0148 (H) Picked up strong SJ radar interference.
0220 (H) Radar contact 8000 yards bearing 175°T which turned
          out to be PICUDA. Exchanged recognition signals
          and at
0420 (H) Completed transfer of registered publications.
0441 (H) Dived and headed up toward channel between YONAKUNI
          SHIMA and IRIOMOTE SHIMA.
1954 (H) Surfaced.

30 May

0413 (H) Dived, patrolling back and forth across channel.
0801 (H) Sighted nine large sailing and motor sampans -
          immediately dubbed FISHROM ONE - range 6000 yards.
          Closed to 2000 yards and watched the fleet sail by.
          (Ship Contact #3).
1235 (H) Sighted ZERO to north distance 7 miles (Plane Con-
          tact #2).
1422 (H) Sighted ZERO to east distance 2½ miles (Plane Con-
          tact #3).
1725 (H) Sighted masts of ship bearing 300°T. Commenced
          approach. (Ship Contact #4) Target group consisted
          of one deeply laden AK-AP identified as AFRICA
          MARU class page 99 ONI 208-J revised, heavily
          escorted. Leading escort one TERUTSUKI class DD
          with single raked stack. Two small escorts one on
          each quarter.

          - 3 -                               ENCLOSURE (A)

— page 10 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.

30 May

1825 (H) Fired three torpedoes from bow tubes. First torpedo
(Attack aimed at stack, second at after mast and third just
#1.) ahead of bow. The leading destroyer escort was about
3000 yards ahead of the target and the starboard
1826 (H) escort had moved up forward of the beam. At
1828:25(H)First torpedo hit.
1828:32(H)Second torpedo hit. When smoke of the second explosion
cleared away target's back was observed to be broken
just aft of the bridge - probably due to heavy loading -
and forward part was elevated at an angle of 20° to
the horizon. Commenced sinking rapidly. A nice
Memorial Day present.
1830 (H) Sunset.
1830 (H) Escort was still headed toward so went deep, rigged
for depth charge attack and at
1832 (H) Received first of 34 depth charges, some fairly close.
DD joined near escort in the fun.
1840 (H) Heard many explosions and breaking up noises in
direction of target.
1851 (H) Last depth charge.
1929 (H) Came to radar depth.
2013 (H) Surfaced and cleared area to South.
From later information believe target to be join-
ing up with large south bound convoy later encountered.
He had slowed speed at sunset and was heading toward
convoy anchorage off IRIOMOTE SHIMA.
2130 (H) Proceeded to rendezvous and join FENNO'S FERRETS.

31 May

0420 (H) Dived.
0445 (H) Sighted PICUDA heading toward on surface. PICUDA
passed 800 yards abeam. Fired two submarine
identification stars - neither of which worked so,
0447 (H) Surfaced and proceeded to exchange recognition
signals with PICUDA. We are now a FERRET. Here
goes our fuel which we've been so carefully hoarding.
We do not have #4 MB converted to carry fuel.
Proceeded to east on scouting line on surface.

1 June

0137 (H) Proceeding east and northeast on the surface. At
Changed course to southwest.

- 4 - ENCLOSURE (A)

— page 11 —
CONFIDENTIAL
U.S.S. GUITARRRO, Report of First War Patrol.

2 June

0040 (H) Received contact report from FENNO. Headed to
          intercept.
0045 (H) Received new contact report from FENNO.
0147 (H) Sighted torpedo hit in target bearing 342°T distance
          25 miles. Headed toward at full speed.
0216 (H) Made radar contact at 17,000 yards and commenced
          approach. (Ship Contact #5)
          Target group was coming down the east coast of
          FORMOSA about twelve miles off the beach. It con-
          sisted of one tanker, one unknown, one escort on
          the beach side.
0302 (H) Sighted target. Off to the right near NASHO TO
          could be seen a burning ship and gunfire bouncing
          off it.
0307 (H) Forced down by DE type escort - not listed above -
          which came in fast apparently by radar, speed about
          25 knots, before firing range could be reached.
0310 (H) One depth charge.
0340 (H) Surfaced on four engines.
0341 (H) Radar contact 250°T range 7900 yards. Commenced
          approach. (Ship Contact #6)
          Target group consisted of one unknown and two
          escorts. Former target group now to the south.
          Range 17000 yards.
0357 (H) Sighted escort, zero angle on bow, range 1500 yards,
          coming in fast. We were at flank speed on four
          engines but he closed steadily. At
0358 (H) Escort opened fire. Dived as shell smacked into
          water close aboard.
0359 (H) Three depth charges, too close for comfort. Went
          deep.
0401 (H) Four more depth charges fairly close.
0409 (H) Periscope depth.
0417 (H) Sighted ship (Ship Contact #7) periscope range 1800
          yards. (Range determined by periscope and checked
          later by torpedo run.)
          (Attack
          #2.)
          Target group consisted of one large tanker, length
          over 500 feet. Subtended more than 2/3 of periscope
          at 1800 yards, identified as similar to NISSYO MARU
          on page 273 of ONI 208-J revised. No escort observed.
0418 (H) Opened outer doors.
0419 (H) Fired four torpedoes, first two at MOT, third at
          stack and fourth just ahead of bow.

- 5 - ENCLOSURE (A)

— page 12 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.

2 June

04:20:48(H) First torpedo hit with terrific explosion. The
GUITARRO shook like a leaf, the circuit breaker on
the sound training motor was tripped out and a light
bulb in the forward torpedo room smashed. It was
the loudest explosion anyone on board had ever ex-
perienced when a torpedo hit. With the sound gear
temporarily out and the Commanding Officer whipping
the periscope around to observe a possible unseen
escort or plane, the second torpedo to hit was not
heard. It should have hit as it was aimed for the
same spot as the first and when the Commanding
Officer got back on the target a new cloud of smoke
and water was seen. A possible hit is claimed for
the second torpedo. At
04:21:05(H) the third torpedo hit. The target had increased in
draft at least fifteen feet and slowed from 12 to 5
knots, so at
04:27 (H) Fired two torpedoes.
04:29 (H) One torpedo hit. That's three sure and possibly
four in this target.
04:30 (H) Heard 17 explosions, possibly distant depth charges.
04:32 (H) Heard torpedo running toward us from 175°T. relative
bearing 270°. Did not wait to see whether it was an
escort or submarine but went to 200 ft. Torpedo
passed overhead aft and was tracked out.
04:34 (H) Heard several explosions, among them two identified
as depth charges. Commenced reload.
05:00 (H) Came to periscope depth and observed target sinking
in two sections. All hands watched this one through
the periscope.
05:05 (H) Target sank. Headed south.
05:08 (H) Sunrise.
05:09 (H) Sighted group of ships (Ship Contact #8) which were
lying to. It looked as though they were waiting for
the escorts to clear the submarines away before
proceeding. Target group consisted of one 4 goal
post AK, one tanker, one unknown ship having an
after stack and two tripod masts (similar to mast
page 262 ONI 208-J revised). Planes overhead and one
CHIDORI type escort.
05:16 (H) Numerous explosions to south.
06:20 (H) Broke off approach. Target group drawing away to
south, minimum range 14000 yards.
07:20 (H) Numerous planes sighted during the morning maintain-
ing an air umbrella over the area. (Plane Contact
#4)

- 6 - ENCLOSURE (A)

— page 13 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.

2 June

0730 (H) Heard ten distant explosions. Decided that since the
           enemy convoy had been running through in sections,
           perhaps more would come along, so got right on
           the track and headed north paralleling the coast.
           Sea calm.
1035 (H) Sighted smoke bearing 017°T.
1045 (H) Went to normal approach course and pulled high speed.
1130 (H) Sighted tops of ships (Ship Contact #3).
1153 (H) Sighted CVE.
           Target group consisted of one CVE, one tanker,
           three AK's, one AP and one escort. CVE turned
           toward at one stage of the approach to launch planes
           then resumed station. Was unable to close to attack
           position in spite of high speed. Minimum range four
           miles.
1252 (H) Broke off the approach.
1421 (H) Sighted MAVIS type plane 6 miles to South.
1512 (H) Heard two loud distant explosions.
1521 (H) Convoy smoke disappeared to South.
1710 (H) Sighted smoke bearing 024°T. Commenced approach.
           (Ship Contact #10)
1714 (H) Sighted BETTY bearing 016°T distance 5 miles.
1716 (H) Sighted MAVIS and ZERO apparently over target.
1819 (H) Sighted small motor sampan bearing 300°T distance
           2 miles.
1828 (H) Sunset.
1924 (H) Identified target as a large passenger vessel. As
           darkness approached she suddenly turned on the lights
           of a Hospital Ship (Ship Contact #10). In addition
           she had three red crosses, one at each mast as well
           as the larger one amidships. Before reaching us she
           turned out the two mast head crosses, leaving only
           the other.
1935 (H) Watched ship go by from perfect attack position,
           range 2300 yards.
2010 (H) Surfaced and sent contact message, (GUITARRO 020400)
           and at
2045 (H) Received MPC receipt.
2100 (H) Received message from FENNO giving new patrol point
           to headed up the coast to pass through the SLOT be-
           tween KASHO TO and FORMOSA before heading over east-
           ward.

- 7 -                                        ENCLOSURE (A)

— page 14 —
CONFIDENTIAL
U.S.S. GUITARRRO. Report of First War Patrol.

                                                                2 June

2215 (H) Sighted ship coming up from a stern bearing 235°T.
         (Ship Contact #11)
2225 (H) Dived and commenced moonlight periscope approach.
(Attack Suspected this fellow of being FENNO because I knew
#3.)    he was south of us and this ship looked low and dark.
2230 (H) Sighted additional vessel about two thousand yards
         astern of target.
2244 (H) Identified target as a MINEKAZE class DD. After
         evaluating all the elements point to a belief that the two ships were
         making a night sweep of the area in combination with
         aircraft because of the recent activity.
2245 (H) Fired two torpedoes.
2248:10(H) Second torpedo hit amidships. Target exploded
         throwing debris high in the air. True bearing now
         325°T.
2250 (H) Heard torpedo approaching from 270°T, the direction
         of the other enemy vessel, followed at
2254 (H) by the first of twenty depth charges, some close
         aboard. A few light bulbs broken and cork knocked
         off. We had started to go under the torpedo so kept
         right on going for the depth charges. Found a nice
         double density layer and let him rage above. He'll
         be out of charges soon anyhow.
         Sound conditions were good but target's screws
         stopped when the torpedo hit and were never heard
         again although his friend could be heard clearly
         running around above. Ship breaking-up noises and
         explosions were heard on the target's bearing two
         minutes after torpedo hit.
2305 (H) Last of depth charges.

                                                                3 June

0023 (H) Surfaced on four engines to clear the area and get
         in a much needed battery charge. Observed large oil
         slick and bits of debris in former position of target.
0028 (H) Received message from FENNO changing our rendezvous.
0045 (H) Sighted MAVIS close aboard. Dived.
0125 (H) Surfaced on four engines. Still hopeful about that
         battery charge. The APR equipment is working wonder-
         fully. All Jap patrol planes we have run into have
         been heard but never sighted - consequently we are fore-
         warned

                                                                ENCLOSURE (A)
                                     - 8 -

— page 15 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.

3 June

     We have not picked up one single plane on the SD
     radar since MIDWAY and tonight surely verified its
     being out of order. If the APR could only be made
     directional, it would be invaluable.
     All hands have had a strenuous forty-eight
     hours and welcome a quiet day submerged.
0410 (H) Dived.
1930 (H) Surfaced.
2050 (H) Received message from FENNO placing us on new scout-
          ing line. Headed west to pass south of FORMOSA at
          high speed.

4 June

0515 (H) Dived.
1942 (H) Surfaced in the center of five lights believed to
          be on fishing vessels. Avoided on the surface.
          Reached patrol station and headed on southerly
          course.

5 June

0002 (H) Received message from FENNO ordering us to return to
          base.
0019 (H) Dived to avoid plane. (Plane Contact #6).
0020 (H) Surfaced and sent message requesting permission to
          remain in the vicinity for a few days.
0140 (H) Dived to avoid plane.
0240 (H) Surfaced, and received affirmative reply to message.
0253 (H) Dived to avoid plane. This is getting monotonous.
          Apparently one of the wolf pack attacked a convoy
          and the hounds are out. The night flying patrol
          planes have picked up our position and with this
          radar make things unpleasant. In the midst of all
          our ups and downs the PICUDA naively asks us by VOYCALL
          "What is the matter - Why don't you answer up?"!
0500 (H) Sighted unidentified plane 4 miles to the northeast.
          (Plane Contact #7)
0600 (H) Sighted MAVIS about 4 miles to the west. (Plane Con-
          tact #8)
1543 (H) Sighted small sampan.
1938 (H) Surfaced and proceeded to south along convoy route.

6 June

0304 (H) Strong indications on the APR. Dived.
0228 (H) Surfaced.
0437 (H) Dived.
2010 (H) Surfaced.

          - 9 -                               ENCLOSURE (A)

— page 16 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.

6 June
2133 (H) Sighted first of several white lights believed to be
fishing vessels. Avoided on the surface.

7 June
0425 (H) Dived.
0915 (H) Sighted BETTY on easterly course, altitude 6000 feet.
0949 (H) Surfaced.
2110 (H) Received COMSUBSPAC 062058.
Our intention had been to patrol up the east coast
of FORMOSA then cut over to YONAKUNI SHIMA and if
nothing else showed up to work out the guns' crew on
FISHRON ONE before departing to the east. Orders
from PEARL changed all that, so headed southeast en
route DARWIN.

8 June
0017 (H) Received contact report, cut in three engines and
headed to intercept. Ran all day on surface.
0855 (H) Made trim dive.
2114 (H) Surfaced.
2119 (H) Arrived at interception point and patrolled slowly
toward south.

9 June
0426 (H) Gave up the hope of interception and proceeded to-
ward south on the surface.
0900 (H) Passed southern boundary of patrol area.

10 June
Sighted several 50 gal. oil drums and life rafts,
the debris of a sinking. Exercised the 20 MM. guns'
crews on the oil drums.

11 June
2200 (H) Passed to command of TASK FORCE 71.

12 June
0647 (H) Sighted unidentified enemy bomber dead ahead,
distance 10 miles. Dived.
1835 (H) Surfaced.
2213 (H) Made radar contact on land and proceeded through
MOLUKKA PASSAGE.
- 10 - ENCLOSURE (A)

— page 17 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.

                                                               13 June

0134 (H) Dived.
1847 (H) Surfaced.

                                                               14 June

0432 (H) Dived.
1836 (H) Surfaced. Encountered heavy seas.
2340 (H) Radar interference similar to that made by friendly
           submarines.

                                                               15 June

0002 (H) Radar contact at 8000 yards, with interference all
           around the dial. Avoided. Range opened to 10000
           yards and submarine drew away to north.
0415 (H) Radar interference to the south. It increased in
           intensity until all around the dial. At
0445 (H) Dived.
0500 (H) Picked up screws.
0517 (H) Sighted friendly submarine on the surface. Passed
           2000 yards away.

                                                               16 June

0512 (H) Dived.
1835 (H) Surfaced.

                                                               17 June

0450 (H) Dived. Proceeding through the MALAY BARRIER east of
           TIMOR.
1835 (H) Surfaced.

                                                               18 June

0450 (H) Dived.
1732 (H) Surfaced.

                                                               19 June

0526 (H) Made rendezvous with R.A.N. ML #315 and proceeded to
           DARWIN.
0825 (H) Moored to BOOM JETTY, DARWIN, AUSTRALIA.

                                     - 11 -                               ENCLOSURE (A)

— page 18 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.

                                                                20 June
At DARWIN.

                                                                21 June
1430 (H) Underway from DARWIN en route FREMANTLE, having
         transferred torpedoes and spare parts to PARGO and
         HARDER.

                                                                22 - 26 June
En route FREMANTLE.

                                                                27 June
0725 (H) Made rendezvous with escort, USS ISABELL.
1015 (H) Moored, North Wharf, FREMANTLE, WESTERN AUSTRALIA.

                                - 12 -                                ENCLOSURE (A)

— page 19 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.

(C) WEATHER.

No unusual weather was encountered.

(D) TIDAL INFORMATION.

No unusual tides or currents encountered. It is noted
that in daylight all southbound traffic hugs the east coast of
FORMOSA to take advantage of the strong southwest current,
whereas north bound traffic pulls out to use the JAPAN CURRENT.

(E) NAVIGATIONAL AIDS.

Two white lights were observed on FORMOSA at SANCHO KAKU.
It is not determined whether these are meant to be navigational
aids or not but they are always there and visible for ten miles.

The light on KASHO TO was observed burning - one flash
every five seconds.

- 13 - ENCLOSURE (A)

— page 20 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.
ENCLOSURE (A)
- 14 -

| No. | Time Date | Lat. & Long. | Type | Initial Range | Course | Speed | How Contacted | Remarks |
|---|---|---|---|---|---|---|---|---|
| 1 | 1300(K) | 26-27N | Unknown | 20,000 | 210 | 20 | Binoculars | Believed to have Radar |
| | 19 May | 146-44E | boat | | | | | 89 Meg.C. Faded out 1 hr. | after broke off attack. |
| 2 | 1730(F) | 25-16N | 1 Patrol | 8,000 | various | 7 | Periscope | Not Zigzagging - Attack #1 |
| | 27 May | 122-09E | boat | | | | | |
| 3 | 0800(H) | 24-18N | 8 Sailing | 7,000 | 28J | 7 | Periscope | |
| | 30 May | 123-25E | Trawlers | | | | | |
| 4 | 1725(H) | 24-30N | 1 AK; 2 PC | 16,000 | 092T | 8.5 | Periscope | |
| | 30 May | 123-25E | 1 DD. | | | | | |
| 5 | 0216(H) | 22-39N | 1 Unknown | 17,000 | 21J | 12 | Radar | |
| | 2 June | 121-23E | 1 Tanker | | | | | |
| 6 | 0341(F) | 22-32N | 2 Unknown | 7,900 | 21J | 12 | Radar | |
| | 2 June | 121-16E | 1 Unknown | 1 Hulk | burning | | | | | |
| 7 | 0417(F) | 22-32N | 3 Escorts | 21J | 11 | Periscope | Attack #2 Bright moonlight |
| | 2 June | 121-16E | 2 Unknown | | | | | (night) |
| | | | 1 AK | | | | | |
| 8 | 0509(F) | 22-30N | 1 Tanker | 14,000 | --- | 11 | Periscope | |
| | 2 June | 121-13E | 1 Unknown | | | | | |
| 9 | 1130(H) | 22-36N | 1 AK | 20,000 | 19J | 12 | Periscope | Attack #3 |
| | 2 June | 121-04E | 1 CVE | 1 Escort | 1 Tanker | | | | | |
| 10 | 1924(H) | 22-34N | 1 Hospital | 16,000 | 19J | 11 | Periscope | |
| | 2 June | 121-02E | Ship | | | | | |
| 11 | 2230(H) | 22-31N | 1 Minekaze | 7,000 | 04J | 13 | Periscope | |
| | 2 June | 121-15E | 1 Unknown | | | | | |

— page 21 —
CONFIDENTIAL
U.S.S. GUITARRO, SS-363

(G) AIRCRAFT CONTACTS
No. | Time | Date | Lat. & Long. | Type | Initial Range | Course | Altitude | How Con-tacted | Remarks
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
1 | 1400 | 26 May | (H) 25-05N | Unknown | 10,000 | 310 | 300 ft. | Periscope | Not detected.
| | | | 123-03E | | | | | |
2 | 1235 | 27 May | (H) 24-10N | Zero | 14,000 | 310 | 400 ft. | Periscope | Not detected.
| | | | 123-30E | | | | | |
2 | 1422 | 30 May | (H) 24-15N | Zero | 5,000 | 280 | --- | Periscope | Not detected.
| | | | 122-25E | | | | | |
3 | 0700 | 30 May | (H) 22-30N | Various | --- | --- | --- | Periscope | Not detected - Covering
| | | | 121-10E | | | | | | ship contacts 7,8,9 & 10.
4 | 1600 | 2 Jun | (H) 22-32N | Mavis | 2,000 | 030 | 500 ft. | Binoculars | Dove to avoid.
| | | | 121-22E | | | | | (night) |
5 | 0050 | 3 Jun | (H) 21-45N | Mavis | 2,000 | --- | 250 ft. | Binoculars | These 3 contacts believed
| | | | 119-16E | | | | | (night) | to be the same plane.
| Strong indication or
| before each sighting
| 148 Meg.C. Dove to avoid
| each time. Remained
| merged after 0253 contact.
6 | 0010 | 3 Jun | (H) 21-40N | Unknown | 8,000 | 180 | 300 ft. | Periscope | Not detected.
| | | | 119-20E | | | | | |
7 | 0140 | 5 Jun | (H) 21-39N | Mavis | 8,500 | 270 | --- | Periscope | Not detected.
| | | | 119-22E | | | | | |
8 | 0253 | 5 Jun | (H) 21-56N | Betty | 15,000 | 010 | 250 ft. | Periscope | Not detected.
| | | | 121-10E | | | | | |
9 | 0600 | 5 Jun | (H) 04-40N | Nell | 14,000 | 135 | 300 ft. | Periscope | Not detected.
| | | | 128-15E | | | | | |
10 | 0645 | 7 Jun | (H) 04-40N | Nell | 14,000 | 135 | 300 ft. | Periscope | Not detected.
| | | | 128-15E | | | | | |

(A) ENCLOSURE
15

— page 22 —
CONFIDENTIAL
TORPEDO ATTACK REPORT FORM

U.S.S. GUITARRO (SS363) Torpedo Attack No. 1 Patrol No. 1

Time 1825 (H) Date 30 May 1944 Lat. 24-30N Long. 122-30E

TARGET DATA - DAMAGE INFLICTED

Description (Details)

A large heavily laden MKFIM type AK-AP of the AFRICA MARU
class (page 99 ONI 208-J revised). Escorted by one DD, TERUTSUKI
class with single raked stack, which was 3000 yards ahead. Two
additional escorts one on each quarter, the one on the star-
board side was of the KOMEBASI type while the other was a PC type.
Estimated at 9500 tons.

Ship(s) Sunk (Number, type, tonnage, name)

One 9500 ton AK-AP (same as above)

Ship(s) Damaged or
Probably Sunk

None

Damage determined by

Heard and observed two hits. Target's back was broken
just aft of bridge and forward part of ship inclined up at
20° to the horizon. Commenced sinking rapidly.
Breaking up noises and explosions were heard from the target
bearing, and her screws stopped for good at the first hit.
Sound conditions excellent.

Target draft 27 feet Course 092°T Speed 8.5 Range 3300 yds.

Own ship Speed 3 Course 035°T Depth 64' Angle 1°Down.

FIRE CONTROL AND TORPEDO DATA

Type Attack:

This attack was a combination submerged periscope and sound
attack. Sound conditions were excellent and since it was
necessary to pull high speed to close the track periscope
exposures were infrequent. Target not zigzagging. Could not
close the track to 3000 yards. The torpedo run was 3 minutes
and 25 seconds for a run of 3300 yards. The escort apparently
heard the fish and turned toward - these Mk.18 Mod.1 torpedoes
are noisy - but the target saw nothing and sailed on.

- 16 - ENCLOSURE (A)

— page 24 —
CONFIDENTIAL
TORPEDO ATTACK REPORT FORM
U.S.S. GUITARRO (SS363) Torpedo Attack No. 2 Patrol No. 1
Time 0417 (H) Date 2 June 1944 Lat. 22-30N Long. 121-16E

TARGET DATA - DAMAGE INFLICTED

Description (Details)

Large tanker, MKMTFK, length over 500 ft. Ship subtended
more than 2/3 of periscope at 1800 yards. Similar to MISSIYO
or class on page 273 ONI 208-J revised. Was one of convoy
travelling in relays, and at time of attack no escort was
observed other than aircraft. Approximately 10,500 tons.

Ship(s) Sunk (Number, type, tonnage, name)

One 10,500 ton AO (same as above)

Ship(s) Damaged or
Probably Sunk

None

Damage determined by

Saw and heard three hits and observed spray and smoke
from what may have been another possible hit. Target was ob-
served to sink 46 minutes after first attack.

Target draft Unknown Course 210°T Speed 12 Range 1900 yds.

Own Ship Speed 3 Course 270°T Depth 62' Angle 0°

FIRE CONTROL AND TORPEDO DATA

Type Attack:

Attack started as moonlight periscope attack and daybreak
came along before a conclusion. Used a snap periscope range
first set up and was lucky. Used periscope spread. After
firing first four torpedoes target draft increased 15 feet and
speed slowed from 12 to 5 knots.

- 18 - ENCLOSURE (A)

— page 26 —
CONFIDENTIAL

TORPEDO ATTACK REPORT FORM

U.S.S. GUITARRO (SS363) Torpedo Attack No. 3 Patrol No. 1
Time 2230 (H) Date 2 June 1944 Lat. 22-33.5N Long. 121-15E

TARGET DATA - DAMAGE INFLICTED

Description (Details)

One of two vessels patrolling the scene of submarine act-
ivity. Identified as MINEKAZE class destroyer with short broken
deck forward, after stack amidships and low contour to after gun.

Ship(s) Sunk (Number, type, tonnage, name)

One MINEKAZE type DD (above) - 1200 tons.

Ship(s) Damaged or
Probably Sunk

None

Damage determined by

Seeing and hearing explosion as one torpedo hit amidships
and target exploded, throwing debris high in the air. Sound
conditions good. DD's screws stopped on hit and never started
again, and after the observed explosion many minor explosions
were heard on that bearing. On surfacing large oil slick
observed in vicinity of target.

Target draft 9'6" Course 040°T Speed 11 Range 2600 yds.

Own ship Speed 3.0 Course 316°T Depth 65' Angle 0°.

FIRE CONTROL AND TORPEDO DATA

Type attack:

Night submerged periscope attack in bright moonlight.
Radar range and bearing were used before diving and target's course
ascertained. Torpedoes were set at five feet and two fired,
the first one aimed ahead, the second at MOT. First one missed.
Own ship was almost parallel to target. Swung around
slowly and used bow tubes.

- 20 - ENCLOSURE (A)

— page 27 —
CONFIDENTIAL

ATTACK NO. 3

Tubes fired -                               #3                  #4
Track angle -                               128                 131
Gyro angle -                                34 R                36 R
Depth set -                                 5 ft.               5 ft.
Power -                                     Electric            Electric
Hit or miss -                               Miss                Hit
Erratic -                                   No                  No
Mk. torpedo -                               18-1                18-1
Serial # -                                  54540               54405
Mk. exploder -                              8-5                 8-5
Serial # -                                  7949                7948
Actuation set -                             Impact              Impact
Actuation actual -                          ---                 Impact
Mk. warhead -                               18-1                18-1
Serial # -                                  1943                1328
Explosive -                                 Tpx.                Tpx.
Firing interval -                           10 sec.             10 sec.
Type spread -                               --- divergent ---
Sea conditions -                            --- calm ---
Overhaul activity -                         U.S. Submarine Base, Pearl Harbor.

- 21 -                                      ENCLOSURE (A)

— page 28 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.

(I) MINES.
    No mines encountered.

(J) ANTI-SUBMARINE MEASURES AND EVASION TACTICS.
    The MK.18 Mod.1 torpedo, although having no wake is a very
    noisy torpedo. Hence the escort will usually hear it and turn
    toward the firing submarine.

    It is noted on one occasion where a convoy was passing
    through waters in which a wolf pack was attacking, the merchant
    ships would stop and wait until the escorts and aircraft had
    forced down any submarines, then proceed in a body.

(K) MAJOR DEFECTS.

    Engine Air Induction

    Presence of excessive water in the engine air induction
    was first noticed on a routine dive on 14 May. The drains
    could not handle the leaking and below 90 feet the leaking ceased.
    On 2 June during heavy depth charging, following attack #3,
    the induction flooded approximately 50%. On all dives after
    2 June the water leaked in faster than the drains could handle
    it, and leaking did not cease below 90 feet. The drains were
    kept shut during dives subsequent to 2 June, and upon surfacing
    it was necessary to ride the airlock until the induction could
    be drained.

    On 3 June the induction was inspected. The gasket appeared
    to have most of the life beaten out of it, although it was not
    cut or torn. When the induction was closed the valve appeared
    to be a metal to metal contact with the seat. The cause of
    this condition was no doubt due to improper original adjustment
    of the linkage.

    It is almost impossible to operate the engine air induction
    hull flappers, as a result of carrying salt water in the in-
    duction. This trouble is partially due to lack of ZERK
    fittings on the flappers. Upon sounding the diving alarm it
    takes two men to close the flapper - one to operate the link-
    age, and one to hang on the flapper and ride it shut.

    Auxiliary Engine

    Trouble first encountered following depth charge attack
    at SAKISHIMA GUNTO on 30 May. After running for any length of

- 22 - ENCLOSURE (A)

— page 29 —
CONFIDENTIAL
U.S.S. CUITARRO, Report of First War Patrol.

time it became impossible to shut the outboard induction in
power, and only with great difficulty in hand.
Attempts were made to free the valve by using lapping
compound on outboard valve stem, unsuccessfully. Trouble
believed due to improper cooling of valve stem, but opportunity
to repair must await return to port.
Vent Riser
Vent riser from #1 main ballast began leaking after near
depth charging on 2 June. Leaks started in two flanges; the
one overhead in the forward torpedo room and in the
flange next to it on the port side. These leaks start when
the boat is at 150 feet and increase down to deep submergence
where the leaks become a stream of water the size of a pencil.
This is right over the torpedo charging panel.

(L) RADIO.
All radio equipment operated satisfactorily. VOYCALL was
used with other submarines but keyed transmissions used.

(M) RADAR.
SD
The SD radar was completely unsatisfactory. Not one
single aircraft was picked up on it, although it was functioning
fairly well on leaving MIDWAY. A MAVIS flying boat was sighted
distance 1500 yards elevation 25° at night - but unfortunately
no time could be taken to calibrate our SD on her at that time.
The need of a testing apparatus such as an echo box is strongly
felt to determine whether the equipment is or is not working.

APR
The equipment, installed at PEARL just prior to departure
for patrol proved to be of great value. It picked up many
enemy radar, sometimes to as great a distance as 200 miles.
After once picking up an enemy radar, we could determine
whether it was sweeping or steady, and if sweeping when it
steadied on us. Also aircraft equipped with radar - in this
respect it is noted that all patrol planes we encountered were
radar equipped, and many were heard searching which were not
sighted - could be noted and by the increase or decrease of
intensity of their radar interference their movements indicated,
at least as far as decreasing or increasing the range.

The SD radar was completely out of order and we were forced
to depend on the APR alone. On the nights of June 1st and 2nd
when we were forced down by aircraft, the APR gave ample warn-
ing by loud indications of an aircraft being picked up by enemy
radar. We were so persistent on 3 June that the next night we de-
cided to dive as soon as a fairly loud indication of an aircraft
was heard on the APR. By this means we attempted to pre-
vent being picked up by enemy radar, and thus cut our nightly
dives to a minimum. It appeared to work, because only one dive
was necessary that night.

- 23 -
ENCLOSURE (A)

— page 30 —
CONFIDENTIAL
U.S.S. CUITARRO, Report of First War Patrol.

We were provided with two frequency units, one 75 - 300
Mcs. and the other 300 - 1000 Mcs. The first proved to be most
useful. Not much opportunity to check surface ship radar was
granted, but we definitely established that aircraft gave an
indication at 98.8 Mcs. and 148 Mcs., while shore based radar
was noted at 79 Mcs.

It is considered highly desirable that this equipment be
made directional. While attempting to intercept on the surface
at high speed enemy aircraft could be easily detected. Also
highly important enemy convoys using radar could be detected
and tracked. In this respect it should be noted that the SP
of a friendly submarine in the vicinity blasted in on
the APR at a great intensity and completely gave away the
proximity of that vessel to us or an alert enemy.

(N) SOUND GEAR AND SOUND CONDITIONS.

The JP equipment was disappointing. Either it is not in
its best working condition or the operation is faulty. In any
case, its sole claim to glory is picking up two torpedoes fired
at us. In many cases screws plainly heard on the supersonic
gear could not be heard on the JP, even when coached on.

Sound conditions were generally very good. Slow heavy
screws would come in at 6000 to 7000 yards with light screws
at slightly greater ranges. Water was always deeper than 100
fathoms in this area.

(O) DENSITY LAYERS.

| Time and Date | Lat. and Long. | Surf. Temp. | Remarks |
|---|---|---|---|
| 1943(H) 23 May | 23-41N 129-44E | 75° | Isothermal to 80 ft. Sharp drop to 70° between 80 and 100 ft. Gradual drop to 69° between 100 and 180 ft. |
| 2005(H) 25 May | 24-45N 123-00E | 81° | Isothermal to 120 ft. Gradual 2° drop to 79° between 120 ft. & 180 ft. |
| 1200(H) 27 May | 25-00N 122-15E | 79° | Sharp drop to 76° between surface & 40 ft. Gradual drop to 75° at 120 ft. Sharp drop to 73° at 120 ft. |
| 2044(H) 28 May | 23-13N 123-04E | 82° | Isothermal to 60 ft. Dropping to 79° at 120'. Isoballast to 200 ft. |
| 1303(H) 30 May | 24-25N 123-21E | 80° | Isothermal to 80 ft. Isoballast to 300 ft. (Note: We could hear DD's every move while we were at 300 ft.) |

- 24 - ENCLOSURE (A)

— page 31 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.

Time | Lat. | Surf.
and | and | Temp. | Remarks
Date | Long. |
1103(H) | 23-10N | 81° | Isothermal to 80 ft. Sharp drop to
31 May | 125-10E | | 76° between 80 and 180 ft.
1530(H) | 22-07N | 83° | Steady drop to 78° at 140 ft.
2 June | 125-07N | | Isoballast from 140 to 300 ft.
2114(H) | 21-20N | 84° | Isothermal to 80 ft. Sharp drop to
3 June | 120-13E | | 82° at 100 ft. Isoballast to 130 ft.
| | | | Sharp decline to 76° at 180 ft.
2024(H) | 18-41N | 84° | Isothermal to 100 ft. Sharp decline
6 June | 126-05E | | to 78° at 240 ft.

The above density layers were considered worthy of note
as indicating prevalent conditions in the localities concerned.

NOTE: 2000 lb. SBT card used. All depths indicated are SBT
blister depths.

(P) HEALTH, FOOD, AND HABITABILITY.

Usual colds, stomach disorders and minor injuries were
encountered during this patrol. There were no epidemics or
anything of a serious nature.

Food and habitability were average.

(Q) PERSONNEL.

Both Officers and men performed their duties in a highly
satisfactory manner, in accordance with the best traditions of
the naval service. A few men who have made a number of patrols
showed some indications of being jittery but not to the extent
of affecting their performance of duties.

Number of men on board during patrol- - - - - - - 73
Number of men qualified at start of patrol- - - - - 29
Number of men qualified during patrol - - - - - - 27
Number of unqualified men making their 1st patrol - 44

A progressive training program has been carried out dur-
ing this patrol with very gratifying results and has succeeded
in qualifying a number of men for advancement in rating. As
a whole the state of training of unqualified men at the start
of the patrol was adequate considering the existing wartime
conditions. It is a policy of this ship not to rate a man
until he has qualified in submarines.

- 25 - ENCLOSURE (A)

— page 32 —
CONFIDENTIAL

U.S.S. GUITARRO, Report of First War Patrol.

(R) MILES STEAMED - FUEL USED.

PEARL to area             4,240 miles     45,513 gals.
In area                   2,439 miles     30,894 gals.
Area to FREMANTLE         3,995 miles     46,165 gals.

(S) DURATION.

Days enroute to area      16
Days in area              16
Days enroute to base      18
Days submerged            22

(T) FACTORS OF ENDURANCE REMAINING.

Torpedoes         Fuel             Provisions         Personnel

13                28,000 gals.     20 days            10 days

Limiting factor this patrol - Patrol terminated by order
of TASK COMMANDER.

(U) REMARKS.

Mark 18 Mod 1 Torpedoes

This vessel carried a full load of Mk.18 Mod.1 torpedoes
which proved very satisfactory and more than met the expectations
of this command.

Maintenance proved to be no problem on this patrol. One
minor ground on one torpedo was experienced and remedied. One
hydrogen eliminator coil burned out and was replaced.

Charging was accomplished by the open circuit voltage
method which reduced handling to a minimum. Torpedoes in the
outboard racks of the forward room were charged in conjunction
with torpedoes in the tubes and inboard racks. This was made
possible by obtaining extra charging leads and installing them
in the outboard torpedoes prior to leaving port. This eliminated
having racks rigged frequently for long periods of time.

Open circuit voltage was used as a data plane for the
charge. The 7 ampere charging rate was used until successive
hourly readings remained the same. Data was then scaled for
all torpedoes based on the information available. In this
manner complete information was compiled for three out of
four torpedoes forward, and all torpedoes aft. Length
of average charge was three hours.

- 26 -                               ENCLOSURE (A)

— page 33 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of First War Patrol.

Routing and charging procedure recommended by PEARL
HARBOR TORPEDO SHOP was followed to the letter for the first
three charges. It was then noted that specific gravities
rarely fell over eight or ten points during the six day period
whereupon the charging interval was increased to eight days. No
water was required during the entire patrol.

Performance was excellent. Eleven torpedoes were fired
in spreads during three attacks. Six sure and one possible
hit resulted. The Commanding Officer did not hear the seventh
shot hit, but observed the resultant spray and smoke, hence
only a possible hit is claimed, even though the torpedo was
fired at the MOT as was the torpedo preceding which hit.

The Mark 18 Mod 1 warheads hit with a terrific explosion,
and lived up to any possible expectation. Depth control was
good, one torpedo being set at 5 ft. and hitting a destroyer
amidships to demolish it.

It is recommended that greater care be taken in filling
the batteries with electrolyte as specific gravities of
torpedoes ranged from 1283 to 1264 in fully charged
condition thereby making comparison of charge difficult.

On the whole we are delighted with this torpedo and will
welcome another full load.

New Oil Rings and Expanders for GM (278A) Engines

Subject rings and expanders were installed at PEARL prior
to leaving on first patrol. Not only was lub oil consumption
cut in half by these rings but also smoke, which has been the
bogey of these engines, was virtually eliminated.

This vessel travelled from NEW ORLEANS to PEARL with
replated liners and the old scraper rings and so an
excellent comparison is available. Too high praise cannot
be given to these rings which have given us a "clear stack."

- 27 - ENCLOSURE (A)

— page 34 —
FC5-16/A16-3
Serial: 0372

C-O-N-F-I-D-E-N-T-I-A-L

FIRST ENDORSEMENT to
CO USS GUITARRO Conf.
ltr. SS363/A16-3 Ser.
033 dated 27 June 1944,
Report of 1st War Patrol.

SUBMARINE SQUADRON SIXTEEN (Es)
U.S.S. RASHER, Flagship,
4 July 1944.

[STAMP: 8 03513]

From: The Commander Submarine Squadron SIXTEEN.
To : The Commander-in-Chief, UNITED STATES FLEET.
Via : The Commander Submarines, SEVENTH FLEET.
The Commander SEVENTH FLEET.

Subject: U.S.S. GUITARRO (SS363) - Report of First War Patrol -
Comment on.

1. The first war patrol of the U.S.S. GUITARRO was conducted
in the area around FORMOSA. The GUITARRO left PEARL HARBOR 7 May 1944
and on 7 June 1944 received orders to proceed to FREMANTLE, AUSTRALIA
for refit. GUITARRO arrived FREMANTLE 27 June 1944 after a fifty day
patrol with eighteen days spent in assigned area.

2. The GUITARRO made three successful attacks firing eleven
torpedoes for six sure hits and one possible.

ATTACK NO. 1 - This was a combination periscope and sound attack
on a large heavily loaded AK-AP with three escorts. High speeds
were necessary to close the track so observations were few. Two
hits out of three were heard and observed and the targets back
was broken. It is noted that just after firing, one escort turned
towards the Mark 18 Mod. 1 torpedo, evidently hearing the torpedo
running.

ATTACK NO. 2 - While operating as one of a wolf pack and trying to
obtain position on a contact GUITARRO was forced down twice by
escorts. The second escort forced GUITARRO down, range 1500 yards,
by gunfire. Twenty minutes after being forced down GUITARRO came
to periscope depth, sighted a large tanker, range 1800 yards. A
quick set up was obtained and four torpedoes were fired for two
sure hits. Ten minutes later two more torpedoes were fired for
one sure hit. Shortly after firing sound heard a torpedo running
towards GUITARRO and she then went deep.

ATTACK NO. 3 - A night submerged attack in bright moonlight plot-
ting course and speed before diving. Two torpedoes were fired at
a MINEKAZE type DD obtaining one hit.

3. The material condition of the GUITARRO is excellent.
Zerk fittings are being installed in the engine air induction flappers
of all boats undergoing refit. All defects will be corrected during the
normal period.

- 1 -

— page 36 —
FE24-71/A16-3 UNITED STATES NAVY 12a/gr.
Serial: 0717 18 July 1944.
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to:
USS.GUITARRO Conf. Ltr.
A16-3 Serial 033 dated
27 June, 1944. Report
of First War Patrol.

From: The Commander Submarines, SEVENTH FLEET.
To : The Commander in Chief, UNITED STATES FLEET.
Via : The Commander, SEVENTH FLEET.

Subject: U.S.S. GUITARRO (SS363) - Report of First War
Patrol - Comment on.

1. The First Patrol of the USS GUITARRO was con-
ducted in the vicinity of FORMOSA as a unit of a Wolf-pack
under the Operational Control of the Commander Submarines,
PACIFIC.

2. GUITARRO's aggressive and skillful tactical
employment while in contact with the enemy and the success
attained in each of her three attacks are indicative of
excellent training and indoctrination. The sinking of an
escort tanker twenty minutes after being forced down by
enemy's gun fire and depth charged, was particularly out-
standing.

3. The Commanding Officer's remark regarding the
effectiveness of new type oil rings and expanders in eliminat-
ing main engine exhaust smoke is noted with satisfaction.

4. This patrol is designated as successful for
purpose of award of Submarine Combat Insignia.

5. The Force Commander congratulates the Command-
ing Officer, Officers and Crew on a well-conducted and
effective first patrol in which the following damage was in-
flicted upon the enemy:

SUNK

- AK (AFRICA MARU Class - EC) 9,500 Tons (Attack No.1)
- AO (NISSYO MARU Class - EC) 10,500 Tons (Attack No.2)
- DD (MINEKAZE Class - EC) 1,200 Tons (Attack No.3)

TOTAL 21,200 Tons

8 0358
- 1 -

— page 37 —
UNITED STATES NAVY
FE24-71/A16-3
Serial: 0717
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to:
ComSubPac Conf. Ltr.
A16-3 Serial 033 dated
27 June, 1944. Report
of First War Patrol.

Subject: U.S.S. GUITARRO (SS363) - Report of First War
Patrol - Comment on.

— page 38 —
[STAMP: Reg. No. 11393]
[STAMP: R. S. No.]

UNITED STATES FLEET
COMMANDER SEVENTH FLEET

A16-3(F-3/roj)
Serial: [HANDWRITTEN: 02301]

C-O-N-F-I-D-E-N-T-I-A-L

THIRD ENDORSEMENT to
USS GUITARRO conf. ltr.
A16-3 Serial 033 dated
27 June 1944. Report
of First War Patrol.

From: Commander Seventh Fleet.
To : Commander in Chief, United States Fleet.

Subject: U.S.S. GUITARRO (SS363) - Report of
First War Patrol.

1. Forwarded.

2. Commander Seventh Fleet welcomes the
U.S.S. GUITARRO to this area and congratulates the
Commanding Officer, Officers, and Crew for a very
successful first patrol during which 21,200 tons of
enemy shipping were sunk.

18 AUG 1944

8 03513

[SIGNATURE: H. W. Graf]
H. W. GRAF,
Chief of Staff.

Copy to:
ComSubs7th
ComSubRon-16
CO U.S.S. GUITARRO

— page 39 —
[HANDWRITTEN: 137 COPY]

3836/A16-3
Serial 037
DECLASSIFIED

U. S. S. GUITARRO (SS363)
c/o Fleet Post Office
San Francisco, California

8 September 1944.

From: The Commanding Officer.
To : The Commander in Chief, United States Fleet.
Via : Official Channels.

Subject: USS GUITARRO, Report of War Patrol Number TWO.

Enclosure: (A) Subject Report.
(B) Track chart. (original only)
(C) Target track charts. (original only)

1. Enclosures (A), (B) and (C), covering the second
war patrol of this vessel conducted in South China Sea area during
the period 21 July 1944 to 8 September 1944 are forwarded herewith.

E. D. H. HASKINS.

[STAMP: DECLASSIFIED-NHT. 0445, OPNAVINST 5510.1C]
[HANDWRITTEN: BY OP-09B9C DATE 5/30/22]

[STAMP: DECLASSIFIED]

[HANDWRITTEN: L 93141]

— page 40 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

(A) PROLOGUE.

     Arrived FREMANTLE, WESTERN AUSTRALIA from first war
patrol on 27 June 1944 and commenced refit by Submarine
Repair Unit, Navy #137. During this period #4 MB tank
was converted to carry fuel, a keying circuit was added
to the SJ radar, and the bridge was cut down to decrease
silhouette. Strut bearing clearances were all found to
be too low and were increased during docking.

     Sound tests and deperming were accomplished.

     Ready for sea and departed FREMANTLE on 21 July 1944
with a full load of Mark 18, Mod. one torpedoes.

(B) NARRATIVE.

                                   21 July

1400 (H) Underway from FREMANTLE, WESTERN AUSTRALIA for SECOND
          war patrol in accordance with COMMANDER TASK FORCE
          SEVENTY-ONE operation order. Met escort,
          H.M.A.S. HORSHAM at harbor entrance. Conducted training
          day and night approaches and at
2315 (H) Released escort and headed North.

                                 22 - 23 July

     Enroute FREMANTLE to EXMOUTH GULF, WESTERN AUSTRALIA.
Conducting training dives and drills.

                                   24 July

0830 (H) Sighted light on NORTHWEST CAPE.
0930 (H) Sighted friendly patrol plane, distance five miles.
1030 (H) Moored alongside fuel barge, EXMOUTH GULF.
1632 (H) Underway from alongside barge. At evening twilight fired
          four rounds of 4" ammunition at wreck off NORTHWEST CAPE.
1835 (H) Sighted H.M.S. CLYDE, exchanged recognition signals
          upon request, gave her navigational data in order to
          enter EXMOUTH GULF.

                                 25 - 26 July

     Underway EXMOUTH GULF to MALAY Barrier, conducting
training drills and dives enroute.

                                   - 1 -                               ENCLOSURE (A)

— page 41 —
CONFIDENTIAL
U.S.S. GUITARRO. Report of Second War Patrol.

                                                                27 July

1450 (H)    Sighted coast of BALI, distance sixty miles.
1532 (H)    Dived.
1948 (H)    Surfaced and stood in toward LOMBOK STRAIT.
2344 (H)    Commenced transit of strait on four engines.

                                                                28 July

0203 (H)    Contacted three enemy patrol craft by radar (Ship Con-
            tact #1) one of which was sighted, and evaded on the
            surface. Weather was favorable as moon had set and sky
            was much overcast. Attempted transit in bright moonlight
            would have been difficult.
0325 (H)    Completed transit.
0503 (H)    Radar contact on two patrol boats (Ship Contact #2),
            range 8000 yards and 2000 yards, one on each bow.
            Avoided on the surface.
0537 (H)    Dived.
0620 (H)    Sighted one of the above patrol vessels bearing 209°T,
            distance 8000 yards. It appeared to be a PC type.
1912 (H)    Surfaced.

                                                                29 July

0535 (H)    Dived.
1052 (H)    Surfaced and headed up between BORNEO and the CELEBES.
2001 (H)    Made SJ radar contact on an aircraft, (Plane Contact #1)
            range 5600 yards and dived.
2020 (H)    Surfaced.

                                                                30 July

0518 (H)    Sighted small boat, (Ship Contact #3) either patrol or
            fisherman, range 1500 yards and avoided on the surface.
0530 (H)    Dived.
1914 (H)    Surfaced.
2025 (H)    Made radar contact on patrol vessel (Ship Contact #4),
            range 11,000 yards. Avoided on the surface.

                                                                31 July

0042 (H)    Made radar contact on patrol vessel (Ship Contact #5),
            range 8000 yards. Avoided on the surface.
0538 (H)    Dived.
0820 (H)    Sighted aircraft (Plane Contact #2), MAVIS, range 4000
            yards to South.
1925 (H)    Surfaced and stood up toward MAKASSAR STRAIT.

                                                                ENCLOSURE (A)
                                        - 2 -

— page 42 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

1 August

0035 (H) Crossed the Equator.
0508 (H) Dived.
0550 (H) Sighted two large topsail schooners, one half mile off
             CAPE MANGKALIHAT, distance 9000 yards (Ship Contact #6).
             These ships carried royals and one had five jibs. They
             headed North close inshore.
1940 (H) Surfaced and headed up through the CELEBES SEA.

2 August

0527 (H) Dived.
0702 (H) Surfaced.
0804 (H) Sighted periscope on port beam distance 1600 yards.
             Turned away at flank speed and avoided (Ship Contact #7).
1231 (H) Dived.
1921 (H) Surfaced.
2200 (H) Commenced transit of SIBUTU PASSAGE.

3 August

0131 (H) Had just cleared Northern Entrance to the PASSAGE when
             two large patrol boats were sighted, one slightly on the
             port bow, the other on the starboard bow, range about
             15,000 yards. Bright moonlight. Later discovered the
             PUFFER had been busy having fun in this area yesterday,
             and the stable-door lockers were busy locking--except we
             inadvertently got inside their barn at the wrong time!
             Avoided one successfully on the surface, but the other
             sighted us and gave chase. We slowly drew away at flank
             speed, after the range had closed to 11,000 yards. He
             was about the size of a DE, but apparently wasn't doing
             the 20.2 knots we were clocking. After a slow hour and a
             half lost him (Ship Contact #8).
0513 (H) Dived.
1915 (H) Surfaced.

4 August

0512 (H) Dived.
1820 (H) Sighted sailboat, range 8000 yards, on southerly course.
             (Ship Contact #9).
1923 (H) Surfaced.
2327 (H) Sighted small patrol boat (Ship Contact #10) on the
             starboard bow, range 7000 yards. Avoided on the surface.

- 3 - ENCLOSURE (A)

— page 43 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

5 August

0130 (H) Converted #4 MB tank from fuel ballast to ballast tank.
0523 (H) Dived.
1940 (H) Surfaced.

6 August

0522 (H) Dived.
0723 (H) Sighted two small sailboats to the North, range 6000
           yards. (Ship Contact #11). We are now running close
           to MINDORO coast.
1933 (H) Surfaced. Attempted to establish VOYCALL and area fre-
           quency communication with RATON unsuccessfully.
2220 (H) Went ahead at four-engine speed to attempt interception
           of east bound convoy.

7 August

           Heading up toward the area at four engine speed.
0145 (H) Picked up radar interference to NE.
0225 (H) Entered area.
0226 (H) Exchanged recognition signals by keyed SJ radar with
           friendly submarine, believed to be RATON. Again
           attempted to establish radio communication unsuccessfully.
0255 (H) Friendly submarine headed out toward West at high speed
           as determined from radar interference.
0257 (H) Commenced search plan for east bound convoy.
0320 (H) Made radar contact to NE, range 17,000 yards. (Ship Con-
           tact #12) Determined contact to consist of at least
           three ships. Commenced end-around to intercept. Enemy
           base course about 120°T. Haze and increased visibility
           prevented complete end-around prior to sunrise.
0430 (H) Dived to radar depth. No radar contact.
0515 (H) Picked up target group in periscope -- still no radar
           contact. Went to periscope depth. Target group con-
           sisted of two small freighters 2500 - 3000 tons, with
           two escorts, one a CHIDORI. Target group zigged away
           to left, minimum range 8000 yards. Unable to close.
0557 (H) Secured from battle stations. Headed up toward CAPONES
           ISLAND LIGHT.
1923 (H) Sighted searchlight beam in the vicinity of CAPONES
           ISLAND LIGHT.
1927 (H) Surfaced.
2000 (H) Made radar contact to NE, range 11000 yards. Commenced
           tracking. (Ship Contact #13) Target group originally
           consisted of two vessels. Later this developed into a
           large convoy with many ships -- reference: ASPRO serial
           -- about five miles beyond the original contact.

- 4 -                                                    ENCLOSURE (A)

— page 44 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

7 August

toward the beach. Both vessels were later sighted and
identified as destroyers. The leading one was making
large "S" sweeps at 15 knots, the lagging one -- which
was originally 2500 yards on the port quarter of the
first -- was not zigging as radically and made eight
knots -- convoy speed. Both pinging. Commenced an
approach on leading destroyer, identified as SHIGURI class DD
(ONI 41-42, DD66-75). Attained attack position and at
2053 (H) Fired three torpedoes at leading destroyer -- range 1900
(Torpedo yards. Target had apparently steadied on new leg one
Attack minute prior to firing. After firing target turned
#1.) toward radically. All torpedoes missed ahead. Not de-
tected and cleared to NW. to gain attack position on
lagging destroyer. Attained attack position and at
2102:26(H)Fired three torpedoes at lagging destroyer identified
(Torpedo as FUBUKI-ANAGIRI class DD (ONI 41-42, DD 44-55),
Attack range 1400 yards.
#2.)
2103:39(H)First torpedo hit depth charge racks.
2103:47(H)Second torpedo hit aft of after stack.
2103:57(H)Third torpedo hit at #1 Gun and blew off the bow.
Saw and heard all hits.
2105 (H) Tremendous explosion which lighted up the sky, flame
shot up about 200 feet, and burning particles splattered
in the water close aboard. The Commanding Officer at
first thought we were illuminated by starshells until
realization came that depth charges were exploding in
the air. The torpedo which hit amidships lifted the
middle of the target which then sagged back with the
bow -- what was left of it -- and stern pointing in a
"V". Target burned with bright orange flame and much
smoke and at
2108 (H) Sank.
Headed in toward convoy, which was now on the radar
screen, with no torpedoes forward while making a
hurried reload.
This convoy was a large and heavily protected one.
Each ship observed had one escort which was of small
type -- PC or SC class. In addition, there were two
outer cordons of escorts consisting of DD's, DE's,
and CHIDORI's. The outer cordon was roving and zigzaging
at twice convoy speed about five miles from the main
body, making wide sweeps. The inner cordon was about
two to three miles from the main body and maintained
convoy speed. At

- 5 - ENCLOSURE (A)

— page 45 —
CONFIDENTIAL
U.S.S. GUITARRO. Report of Second War Patrol.

7 August

2116 (H) Commenced approach on large AK with small escort ahead.
          Entire convoy had reversed course 180° since pyrotechnic
          display preceding. The moon came out and the visibility,
          which had allowed a surface approach undetected to within
          1100 yards on the second attack, now increased suddenly
          and prevented swinging ship to fire stern tubes without
          detection at a range of 2800 yards. This action was by
          now a melee. Bow tubes ready ready.
2120 (H) Sighted destroyer astern which came out of the haze at
          high speed, range 2400 yards, sighted us and turned toward.
2121 (H) Dived. Sound reported DC coming in.
2123 (H) One depth charge at 80 feet. Went deep and rigged for
          depth charge attack.
2130 (H) Two more, followed by fifteen depth charges which were
          too well directed. Two plugs in the main engine salt
          water pumps blew out and main engine air induction and
          ship's ventilation lines flooded.
2137 (H) Last depth charge. Of many escorts, which seemed to
          ring us around completely, two remained close aboard
          pinging loudly for over an hour while the convoy cleared.
2357 (H) Surfaced and cleared to NW.

8 August

0434 (H) Put in a much needed battery charge. Unable to reach
          CAPE BOLINAO tonight for our rendezvous with RATON.
          Attempted to send her a message establishing scouting
          line off POINT BOTOLAN, but had difficulty establishing
          communication, so sent it blind in the hope she would
          get it. Sent GUITARRO serial to VIXO via NPM.
          Dived eight miles off BOTOLAN POINT and headed close
          inshore.
0826 (H) Sighted MAVIS to South, distance two miles. (Plane Con-
          tact #3)
0835 (H) Sighted five ships, two trawlers of about 150 tons with
          three sampans heading down the coast (Ship Contact #14).
          They passed 2000 yards away.
1155 (H) Sighted one sampan heading down coast, range 8000 yards.
          (Ship Contact #15)
1530 (H) Sighted group of seven ships, range 10000 yards. (Ship
          Contact #16) They were of small coastal type ranging
          from 250 to 750 tons. They passed 2500 yards away.
1600 (H) Sighted line of eight vessels, (Ship Contact #17) range
          11,000 yards. This group consisted of coastal vessels

- 6 -
ENCLOSURE (A)

— page 46 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

8 August

slightly larger than the preceding group, and ranged
from 450 to 900 tons. Marked the last two vessels care-
fully as potential gun victims. The last one was the
biggest, about 900 tons, and the one just ahead was
identified as similar to MINATO MARU type, classed in
Deep Sea Fishing type ONI 208-J estimated at 700 tons.
1630 (H) Headed out toward West, and at
1800 (H) Turned down coast to parallel track of coastal vessels.
1926 (H) Surfaced and bent on four engines to overtake enemy ships.
2015 (H) Sighted small stern lights of column of ships. A 4" gun
crew manned the gun.
2020 (H) Radar contact on our target, range 8000 yards. Our
intended target was the biggest and last ship, but we
were here thwarted by Japanese intelligence. All the
ships in column showed stern lights to help steer
except the last one who had no ship astern and so
reasonably showed no light — thereby giving no
point of aim. The night was very black, the position about
four miles off coast with a mountain background so a
point of aim was desirable. We passed up the unreason-
able one, and at
2045 (H) Opened fire on the second ship from the end of the line.
(Gun Range 2650 yards. First shot hit and set target on fire.
Attack Now we had a dandy point of aim. Third shot hit and
#1.) fourth ricocheted off target. Ceased fire after five
shots. Target burned until he sank, and pip disappeared
from radar screen. The leader fired a green Very star
and the other ships doused their lights and scuttled for
the beach and shallow water. With CAPONES ISL. three
miles ahead, turned away to the NW at full speed. Headed
over to CAPE BOLINAO to rendezvous with RATON.

9 August

Established satisfactory radio communication by key
on VOYCALL circuit with RATON and established scouting
line for both night and day.
0140 (H) Radar contact to North, distance 11,000 yards. Here we
go again. Commenced tracking. When range closed to
8000 yards sighted target and identified as DD or DE.
Much interference on APR equipment indicated he had
radar. (Ship Contact #13)
He was patrolling a point, pinging, and making figure
eights. Bright moonlight prevented surface attack and
he would not remain on one course long enough to make a
submerged attack so, at

- 7 - ENCLOSURE (A)

— page 47 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

9 August

0240 (H) Broke off attack and headed up toward BOLINAO hoping to
          find a convoy inboard of the patrolling vessel.
0508 (H) Dived and headed in close to beach -- two miles off.
0540 (H) Sighted smoke bearing 041°T.
1010 (H) Masts in sight.
1022 (H) Sighted five ships. (Ship Contact #19) range 14000 yards,
          heading down the coast. They were small coastal type
          vessels of 150 to 500 tons. Passed 2500 yards away.
1038 (H) Surfaced and headed out to patrol line. Sighted RATON on
          way out. Search plan by night consisted of an East-West
          line off CAPE BOLINAO with RATON five to ten miles off-
          shore--she reported radar out of commission--and GUITARRO
          15 to 25 miles offshore with synchronized patrol. During
          day light both ships close inshore, RATON North of Lat.
          16°-20', GUITARRO to South.

10 August

0345 (H) Headed in toward day patrol station close inshore off
          CAPE BOLINAO.
0456 (H) Dived.
0840 (H) Sighted four sailboats (Ship Contact #20) to the north-
          east on a southerly course.
0900 (H) Sighted smoke bearing 136°T.
0902 (H) Picked up pinging on sound gear from the direction of the
          smoke.
0925 (H) Sighted two planes to the South. (Plane Contact #4) one
          an EMILY, the other a small float plane which looked
          ship based.
          The signs were plain. Smoke plus pinging plus planes
          equals convoy.
0940 (H) Went to battle stations as masts appeared heading up the
          coast. Commenced approach. (Ship Contact #21)
          When first sighted, smoke and masts could be seen
          heading up the LUZON coast, hugging the shore. At that
          time our position was one mile and a half offshore, and
          intent was to remain in that position and hit the convoy
          from the beach side. The sea was very calm with enemy
          aircraft overhead and periscope exposures were of
          necessity of short duration and infrequent. Leading
          ship was a medium AK, with a vessel, later identified
          as a KATORI class light cruiser, in column open order
          on her starboard quarter. Astern of the cruiser was a
          medium tanker with an escort on her port bow and one on
          her port quarter. Astern were more ships. One escort

- 8 -
ENCLOSURE (A)

— page 48 —
CONFIDENTIAL
U.S.S. GULLIANO, Report of Second War Patrol.

10 August

was about 9000 yards to seaward from the leading ship
bearing 320° relative from her.
Picked cruiser -- then still unidentified -- as first
target with intent to fire stern tubes at her, four bow
tubes at the tanker, and remaining fish at any target of
opportunity.
With range to the target about 4500 yards, a new
column was observed inboard of target group with an angle
on the bow zero. It consisted of one small escort on the
beach bow, two large AK's in column, and more ships
astern. Small distance between columns prevented going
between the two, and small distance to the beach pre-
vented moving closer to the beach than we already were.
Target was now identified as a KATORI class light
cruiser with high bow, single stack and high fore and
mainmasts (ONI 41-42 CL's 18-20). Her resemblance to
the HOUSTON class of heavy cruisers is remarkable at
small angles on the bow. It is believed that the
float plane was hers -- catapult was bare -- and that
she was providing part of the air coverage for the convoy
when out of range of land-based planes. Waited until
KATORI and AK were coming in line and at
1029:16(H)Fired four torpedoes from after tubes.
(Torpedo At completion of firing we were dead ahead of
Attack column with escort headed toward us, angle on the bow
#3.) zero, range about 1400 yards. No time to fire bow tubes
so started down. At
1032 (H) First torpedo hit - cruiser.
1032:11(H)Second torpedo possible hit - cruiser.
1033 (H) Fourth torpedo hit - AK.
1035 (H) Heavy explosion from one of the torpedoed ships. The
RATON later reported that she had observed our target
burning furiously from stem to stern with clouds of black
and white smoke covering tops and even freeboard and that
she looked to be in serious trouble. Inasmuch as the
KATORI carried gasoline for her plane as well as ammuni-
tion and torpedoes, it is believed that she experienced
the explosion and thereafter the furious fire. Periscope
observation about an hour and a half later at a range of
less that 4000 yards from hits showed no evidence of
attacked vessels, nor smoke of burning. Those raging
fires were probably extinguished only one way. She is
considered probably sunk.
From torpedo run time and position of overlapping
targets the fourth torpedo hit the medium AK.

- 9 - ENCLOSURE (A)

— page 49 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

10 August

1036 (H) First depth charge. Ran under the convoy and counted
          forty three depth charges during next fifteen minutes -
          none close.

1220 (H) Got tired of being pushed around by escort vessels, one
          of which was pinging up ahead and one on the starboard
          quarter. Came to periscope depth. Two destroyers in
          sight, one on port bow range 2400 yards, one on star-
          board quarter range 4000 yards. They were searching at
          seven knots, both pinging. One medium AK was observed
          heading up the coast out of range, apparently the tail-
          end of the convoy. Searched for attacked vessels, but
          neither the cruiser nor the AK, nor any sign of a burn-
          ing ship were in sight, although the visibility was
          excellent.

1237 (H) Commenced approach on closest destroyer. At
(Torpe-   Fired four torpedoes at FUBUKI-HIBIKI class destroyer.
do Attack (ONI 41-42 DD 56-59) First torpedo ran for 45 seconds
#4.)      and quit. Second torpedo hit just abaft bridge.
          Observed tremendous explosion which shook this vessel
          and temporarily blew out QB panel. Bits of metal rained
          in the air, some of which on sinking struck the hull.
          Range at firing about 1600 yards. Fourth torpedo hit.
          This one was a spare and not needed for then last seen
          destroyer was sinking with bow under water and only part
          of stern visible.

1241 (H) Went deep and rigged for depth charge attack. The clan
          soon gathered, and the search was very efficient and
          well conducted, using a retiring search curve. No
          charges were dropped until

1403 (H) When six heavy very close depth charges were dropped
          which caused considerable superficial damage. Many light
          bulbs and shades were smashed throughout the ship, gages
          decalibrated, motor cooling sea line broken, electrical
          circuits topside knocked out, master sea and stop valve
          commenced leaking, etc.

1700 (H) Pinging faded out.

1845 (H) Periscope depth, all clear.

1925 (H) Surfaced and cleared the area to the West.
          Sent contact report, established radio communication
          with PATON and designated new rendezvous. Sent GUITARRO
          serial

- 10 - ENCLOSURE (A)

— page 50 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

                                        11 August

                  Proceeding to new area in accordance with COMMANDER
                  TASK FORCE SEVENTY-ONE despatch serial      of 10 August.
0521 (H)          Dived to spend a day of rest.
1942 (H)          Surfaced.

                                        12 August

0542 (H)          Effected rendezvous with RATON and exchanged information.
0638 (H)          Headed SW. on scouting line conducting surface patrol.

                                        13 August

                  Surface patrol on scouting line with RATON. At
2000 (H)          Effected rendezvous.
2030 (H)          Resumed patrol.

                                        14 August

1953 (H)          Headed north at two engine speed on surface conducting
                  area search.

                                        15 August

1310 (H)          Commenced surface patrol across EMPIRE - SINGAPORE
                  trade routes, base course 300°T and reverse. RATON on
                  the line to SE. Unpleasant weather, large seas, squally
                  and overcast.
                  Master gyro compass follow up failed today. Steering
                  by auxiliary gyro.

                                        16 August

                  Uneventful surface patrol. Weather still bad.

                                        17 August

0400 (H)          Headed southeast on surface with RATON to east on
                  patrol line. We are due to shift station tomorrow
                  and by heading south we can cover the MANILA - SINGAPORE
                  route as we go.

                                        18 August

0510 (H)          Rendezvous with RATON. Headed East on surface.
2230 (H)          Intercepted RASHER's contact message of south bound
                  convoy, and knowing that HARDER and pack could not as

                                        - 11 -                                ENCLOSURE (A)

— page 51 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

18 August

yet be in their area, decided to cover the convoy with
GUITARRO and RATON before arrival MANILA:
2300 (H) Headed North off BOTOLAN POINT and sent RATON off
CAPONES ISLAND LIGHT.

19 August

0500 (H) Dived off BOTOLAN POINT and headed close inshore.
Sighted many sampans during the day heading both up and
down the coast. (Ship Contact #22)
1020 (H) Sighted MAVIS to southeast, distance three miles. (Plane
Contact #5)
1500 (H) Sighted MAVIS to southeast, distance five miles. (Plane
Contact #6)
1501 (H) Sighted unidentified bomber to northeast, distance four
miles. (Plane Contact #7)
1615 (H) Sighted NELL to southeast distance four miles. (Plane
Contact #8)
2025 (H) Surfaced.
Decided that since convoy had not shown up as expected,
they had either put into a harbor, or by passed us, and
since we were in another wolf pack's area whose arrival
should be tonight, we should pull out to our own area,
at
2215 (H) Headed south.

20 August

0529 (H) Dived off CAPE CALAVITE. RATON's assigned position close
inshore to North of light, we to South.
0730 (H) Sighted EMILY to East, distance ten miles. (Plane Con-
tact #9)
1900 (H) Surfaced.
2125 (H) Sighted hospital ship, (Ship Contact #23) properly
lighted, which headed down the channel between GOLO
ISLAND and CALAVITE, then rounded CALAVITE and headed
south.
2246 (H) Made radar contact on patrol boat at 8000 yards (Ship
Contact #24), which was headed across MINDORO to CALAMIAN
GROUP. Hoped he was an escort going down to meet a
convoy and bring it back. Let him go.

21 August

Headed in toward CAPE CALAVITE and at
0457 (H) Dived.
0555 (H) Heard distant depth charges or aerial bombs.

- 12 - ENCLOSURE (A)

— page 52 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

21 August

0600 (H) Sighted smoke to southeast.
0605 (H) Sighted masts of ships, (Ship Contact #25) and picked
up pinging, on sound gear. Range about 18,000 yards.
Commenced approach. Master gyro compass follow-up has
been out of commission for one week. Steering by aux-
iliary gyro. TDC and conning tower repeaters kept
matched to auxiliary gyro manually, by an officer who
rotated the follow-up mechanism.
0620 (H) JP sound gear reported ten torpedoes fired in direction
of convoy. At this time convoy was in the midst of a
column course change from northeast to north. Most of
the ships had a large port angle on the bow whereas the
two leading ones had almost a zero angle.
0623 (H) Sound of torpedo hits followed by frenzied depth charging.
Later events proved either MADDOX or RAY had just attacked.
Ships all changed course in all directions.
0640 (H) Convoy steadied down heading north with GUITARRO dead
ahead about six miles offshore. Depth charging still
going on and from sound of explosions large charges were
being used.
0650 (H) Convoy zigged radically to his right and headed close
inshore to CALAVITE. Came to normal approach course and
pulled high speed to get in. An unfavorable westerly
set of 1.2 knots handicapped this closing of the range.
Target group consisted of two large tankers in column
followed by large M. Further aft was an unidentified
maru. A burning vessel believed to be a tanker
could be seen to the south. Possibly an additional
was far aft in column but poor visibility against a
shore background prevented positive observance. At this
time all escort vessels - three in eight - were to the
west of convoy, playing games with submarine or sub-
chasers which had attacked. Observed depth charging at about
four miles, and explosions were very loud at that dis-
tance. More about these charges later. Still pulling
high speed with dummy hopes as range slowly decreased.
First tanker - heavily - out of range. Shifted
to second tanker. Second tanker - nice ship - out of
range. Shifted target to third ship, a large AK.
Target was identified as similar to KUNAZIMA MARU
page 213 ONI (Revised). Compared to length of the
large tankers, at least 500 feet, the AK length was be-
tween 415 and 425 feet long. Estimated at 6000 tons. At

- 13 -
ENCLOSURE (A)

— page 53 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

21 August

0717 (H) Target fired after gun in direction of escorts, and
        turned radically towards us through ninety degrees.
        Believed he had either sighted us, another submarine,
        or something suspicious in the water, but he turned
        back slowly to original course. This was real coopera-
        tion, as the target decreased the distance to the track
        by some 600 yards, placing him just within range of our
        MK.18 torpedoes - and making him the only target within
        range. It is believed that the gunfiring was possibly a
        signal recalling the escorts, since they started coming
        up at high speed heading toward the target group. Three
        escorts - CHIDORI type - heading up. At
0721 (H) Fired four torpedoes. Escorts coming up fast with a
(Torpedo bone in their teeth.
Attack
#5.)
0724:40(H)First hit, torpedo run 3700 yards.
0725:20(H)Second hit, followed by heavy explosion.
0727 (H) Went deep as escorts were getting too close.
        First barrage of heavy depth charges. During the next
        eleven minutes a total of fifty depth charges were
        dropped, all heavy and most close. This vessel has
        experienced four sustained depth charging in this pa-
        trol, with prolonged search after each one, but these
        depth charges dropped were the heaviest yet encountered.
        It is believed that depth charges heavier than 600 lbs.
        are being used. Damage sustained included all bridge
        electrical circuits out, bridge TBT's ruined, JK-QC sound
        gear damaged, packing gland on port shaft shot, which
        caused flooding of the motor room and spare parts lock-
        ers, with subsequent damage to electrical spares. A
        bucket brigade was necessary to keep ahead of the flood-
        ing.
        Later events showed this convoy to have been the
        victim of a perfect unplanned wolf-pack attack. The RAY,
        passing through our area hit the convoy, followed by an
        attack by the HADDO, also a transient, and then by the
        GUITARRO. With such excellent sound conditions we could
        never have pulled full speed for so long at the range we
        did in order to get in had not the escorts been pulled
        off by the HADDO's attack. At
0756 (H) Loud breaking-up noises were heard both on the JP and
        super sonic sound gear on true bearing of the target.
        His screws - sound conditions were excellent and picked
        up screws at 8000 yards - stopped at time of first hit,

- 14 -
ENCLOSURE (A)

— page 54 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

21 August

and never started again. Both leading tankers were
followed past CAPE CALAVITE and escort vessels were
plainly audible. These breaking up noises were heard
over a period of 15 to 20 minutes, at which time they
stopped. Subsequent surface investigation of the site
of the attack showed much debris, including an abandoned
lifeboat, broken boat cradle, life jackets, a stateroom
door, cork, timbers, fuel oil on the water, etc. Target
is considered to have sunk. Evaded to NW.
1420 (H) Heard six distant depth charges. Must be the lads giving
up.
1527 (H) Came to periscope depth. One escort in sight, about
12,000 yards astern.
1917 (H) Surfaced. Established communication with RATON and
headed south for patrol near CALAMIAN group.

22 August

0507 (H) Dived.
0610 (H) Heard four distant explosions to the north.
1620 (H) Sighted NELL (Plane Contact #10) to east, distance ten
miles.
1909 (H) Surfaced.
2258 (H) Rendezvous with RATON. Exchanged information.
2327 (H) Resumed patrol line.

23 August

0507 (H) Dived.
1920 (H) Surfaced.

24 August

Headed back to patrol stations off CALAVITE on scout-
ing line with RATON.
0500 (H) Dived and headed close inshore, three miles off the CAPE,
RATON to south. Much debris of our former sinking still
in the water. It remained in the vicinity for the next
two days.
1923 (H) Surfaced.

25 August

0503 (H) Dived.
0640 (H) Sighted two RUFES, (Plane Contact #11) to south distance
three miles.

- 15 - ENCLOSURE (A)

— page 55 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

                                                              25 August

1155 (H) Sighted JAKE to NW, distance three miles. (Plane Con-
          tact #12).
1700 (H) Sighted coastal sampan (Ship Contact #26) which headed
          south close inshore.
1925 (H) Surfaced.
2147 (H) Rendezvous with RATON.
2205 (H) Resumed patrol.

                                                              26 August

0440 (H) Dived.
1430 (H) Sighted 100 ton coaster (Ship Contact #27) which headed
          south close to the CAPE.
1917 (H) Surfaced.
2000 (H) Received message from RATON that pinging and air cover
          had been heard and observed about 1300 (H) apparently
          headed south, 25 miles off CALAVITE. Went on speed and
          headed south to search.
2350 (H) Search barren. Established new patrol line across
          PALAWAN - MANILA route.

                                                              27 August

0504 (H) Dived.
1435 (H) Sighted masts of ships bearing 043°T. Commenced approach.
          (Ship Contact #28).
          Target group consisted of three coastal tankers, light
          unescorted. Similar to AKASU MARU, (EC) page 270 ONI
          208-J (revised) with the exception of the forward bridge
          structure which was missing. Length about 280 feet.
          Estimated tonnage 2000 tons. It is believed these
          vessels had no escort due to their light draft unloaded
          and subsequent immunity to torpedo attack - as later
          proved. At
1523 (H) Fired two torpedoes at lagging vessel. No hits. Setup
          was good and it is believed one torpedo ran under bow
          which had a draft of about four feet. Draft aft about
          seven feet.
1532 (H) One torpedo exploded at end of run. Tankers did not
          hear it or if so took no action but continued to hold
          course and speed toward shoal water off COLOCONTO ROCKS.
          Came around in a cold rage that two fine torpedoes
          had been fruitlessly expended on our indifferent friend
          and trailed at six knots.
1842 (H) Surfaced and proceeded to close the range, with 4" gun
          crew standing by. When range to lagging tanker was

                                                              - 16 -
                                                              ENCLOSURE (A)

— page 56 —
CONFIDENTIAL
U.S.S. GUITARRO. Report of Second War Patrol.

27 August

2850 yards - the moon was shining through clouds and
target looked big as a house -
1929 (H) Opened fire with 4" gun. First shot a bullseye in the
(Gun after superstructure and pilot house and set him a fire.
Attack Other ships, well ahead, turned toward rocks and shoal
#2.) water. After several more hits target's rudder jammed
and he commenced swinging in circles. After 31 rounds
fired, with ten hits, target was in bad shape, sinking
aft and on fire. Closed the range to 1400 yards and
opened up with after 20 MM. One shot, a hit, and gun
jammed. Target then opened fire with rapid fire gun
the size of a .30 caliber and rapidity of fire of a
20 MM. Came around fast and opened the range but he
sprayed our bridge and scored about four hits on the
bridge, shears and fairwater. No personnel injuries.
Fired one more round of 4" ammunition. Opened the range
to 6000 yards whereupon target got his big gun - a
4.7" - going, and threw a few shots around us - not
close. Had been going to shoot at him some more at
range of his pea-shooter but his big gun - unobserved in
daylight through periscope - changed all that. It
was only a dying flurry as when last seen he was burning
fiercely and sinking with stern going under. Target is
considered to have sunk. This target was picked up at
10,600 yards on radar, with a 170 degree angle on the
bow, whereas our radar does not pick up destroyers until
about 8,000 yards, with a similar angle.
Proceeded back toward CALAVITE at four engine speed.
RATON was detached at dark and departed area. Due to
our distance from patrol line, because of the chase, no
opportunity presented itself to have her assistance in
the above engagement.

28 August

Patrolling 25 miles off CAPE CALAVITE as it is
believed Japanese have moved their shipping out after
the last submarine attack on inshore convoy.
0505 (H) Dived.
1305 (H) Sighted two SAILYS to southeast, distance 7 miles.
(Plane Contact #13)
1917 (H) Surfaced and headed west to rendezvous with GUNNEL.

- 17 - ENCLOSURE (A)

— page 57 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

                                                                29 August

0343 (H) Effected rendezvous with GUNNEL. Assigned patrol sta-
                tions for next day, and informed her of our date of
                leaving station.
0421 (H) Rendezvous completed. Headed east on search line.
0535 (H) Dived.
1922 (H) Surfaced.
2000 (H) Heard distant intermittent pinging to south but high
                speed search revealed nothing. Pinging moved rapidly
                to southeast, and faded out. Then shoal water was
                reached at
2205 (H) Broke off search.

                                                                30 August

0035 (H) On station, commenced East - West patrol.
0505 (H) Dived.
2036 (H) Surfaced and proceeded to clear area in accordance with
                COMMANDER TASK FORCE SEVENTY-ONE operation order.
                Attempted to inform GUNNEL by radio to that
                effect, but communication was unsuccessful due to much
                interference.

                                                                31 August

                Proceeding on surface off coast of PALAWAN. At
0548 (H) Sighted four small fishing boats.
0600 (H) Sighted patrol boat to southwest, distance 7 miles (Ship
                Contact #29), and attempted to avoid on surface.
                Attempt unsuccessful due to his high speed, so at
0643 (H) Dived.
1055 (H) Surfaced and stood south in the SULU SEA.

                                                                1 September

                Heading into SIBUTU PASSAGE on surface.
0735 (H) Sighted 1AVIS to east circling over TAWI-TAWI
                anchorage. (Plane Contact #14) Also sighted what
                appeared to be masts of ship which suddenly came in
                line. (Ship Contact #30) As we were only 14 miles
                from the beach
0737 (H) Dived. Ship apparently did not come outside the
                anchorage.
1925 (H) Surfaced and proceeded to south in CELEBES SEA.

                                                                - 18 -
                                                                                                ENCLOSURE (A)

— page 58 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

2 September

0706 (H) Commenced surface patrol across track of reported convoy
          north of MAKASSAR STRAIT.
0925 (H) Radar contact on aircraft at 18 miles. (Plane Contact
          #14) Sighted MTTY to east. Range closed so, at
0926 (H) Dived. As this plane was believed to be air cover for
          convoy remained submerged to conduct submerged patrol.
1640 (H) Surfaced and abandoned patrol. Headed south through
          MAKASSAR STRAIT.
1945 (H) Crossed the equator.
2010 (H) Sighted patrol boat bearing 240°T, distance 6 miles.
          (Ship Contact #31). Avoided on surface.
2034 (H) Sighted patrol boat bearing 110°T, distance 6 miles.
          (Ship Contact #32). Avoided on surface.

3 September

0242 (H) Sighted small unidentified boat bearing 170°T, distance
          4 miles. (Ship Contact #33) Avoided on surface.
0436 (H) Sighted patrol boat bearing 200°T, distance 8 miles.
          (Ship Contact #34) Avoided on surface.
0600 (H) Passed CAPE ILLIAN abeam.
0745 (H) Sighted sailboat bearing 190°T, distance 8 miles. (Ship
          Contact #35) Passed close aboard and observed native
          crew.
0815 (H) Cleared strait and stood into FLORES SEA.
1655 (H) Radar contact on aircraft, 13 miles. (Plane Contact #16)
1657 (H) Sighted unidentified plane heading in
1658 (H) Dived.
1732 (H) Surfaced.

4 September

0233 (H) Sighted patrol boat (Ship Contact #36), bearing 255°T,
          distance 4 miles, and avoided on surface. This is the
          advance guard of LOMBOK.
0336 (H) Made radar and sight contact on two patrol boats (Ship
          Contact #37), one bearing 240°T, range 6 miles, the
          other bearing 105°T, range 5 miles. Avoided on surface
          by going between them. The night, although bright moon-
          light, was hazy enough to make our camouflage work.
0445 (H) At entrance to LOMBOK STRAIT. Headed in on surface.
0555 (H) Dived.
1030 (H) Surfaced, well clear and stood south.
1845 (H) Radar interference believed to be friendly submarine,
          bearing 135°T.

- 19 -
ENCLOSURE (A)

— page 59 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

5 - 7 September

Enroute FREMANTLE, W.A.

8 September
0820 (H) Moored starboard side to submarine nest, North Wharf,
FREMANTLE, W.A.

- 20 - ENCLOSURE (A)

— page 60 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

(C) WEATHER.

     No unusual weather was encountered. Seas were for the most
part calm, sometimes glassy, and skies much overcast.

(D) TIDAL INFORMATION.

     During the southward transit of LOMBOK STRAIT a current of
four knots to the south was encountered.

(E) NAVIGATIONAL AIDS.

     It is believed that prior to convoy arrival off CAPONES
ISLAND LIGHT a flashing light is shown at intervals as a beacon.

- 21 -                                        ENCLOSURE (A)

— page 61 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.
(F) SHIP CONTACTS.

No. | Time | Date | Lat. & | Type | Initial Est. Course | How con- | Remarks
| | | Long. | | Range | & Speed | tacted |
1 | 0203- | 28 Jul | 8-36S | 3 Patrol | 5,500- | Var. up to | R | Avoided
| | | 115-45E | boats | 1,400 | 17 | |
2 | 0503- | 28 Jul | 7-52S | 2 Patrol | 8,000- | Var. | R | Avoided
| | | 110-04E | boats | 2,000 | 6 | |
3 | 0518- | 29 Jul | 2-25S | 1 Small | 1,500 | 120 | SN | Avoided
| | | 118-07E | boat | | 5 | |
4 | 2025- | 30 Jul | 2-18S | 1 Patrol | 11,000 | Var. | R | Avoided
| | | 118-22E | boat | | 3 |

— page 62 —
CONFIDENTIAL
U.S. GUITARRO, Report of Second War Patrol.

No. | Time Lat. & | Type | Initial Est.Course | How con- | Remarks
    | Date Lon. | Range & Speed | C/C | tacted
21 | 0900-H 10-17N | 1 KATORI | 17,000 | 010 | 8 | P | Torpedo at-
   | 10 Aug 119-46E | 1 MIMIKI | | | | (smoke) | tack #3
   | | (4 tiny escorts, DDs & Marus) | | | | |
22 | 0812to 15-19N | 3 small | 5,000 | 170 | 5 | P | -
   | 1916-H 119-59E | ships | | | | |
   | 19 Aug | | | | | |
23 | 2115-H 13-27N | 1 Hospital | 20,000 | 200 | 13 | SN | -
   | 20 Aug 120-14E | ship | | | | |
24 | 2246-H 13-21N | 1 Patrol | 3,20

— page 63 —
CONFIDENTIAL
U.S.S. GUITARO, Report of Second War Patrol.

(G) AIRCRAFT CONTACTS.

Contact Number | #1 | #2 | #3 | #4 | #5 | #6

S Date | 29 Jul | 31 Jul | 8 Aug | 10 Aug | 19 Aug | 19 Aug
U
M Time (Zone H) | 2001 | 0820 | 0826 | 0925 | 1020 | 1500
A Position: Lat. | 04-53S | 00-57S | 15-14N | 16-15N | 15-15N | 15-15N
R Position: Long. | 118-00E | 111-10E | 119-50E | 119-45E | 119-50E | 119-55E
I Speed | 13 | 2 | 2 | 2 | 2 | 2
N
E Course | 010 | 028 | 295 | 020 | 140 | 155

Trim. | Surf. | 82' | 64' | 64' | 64' | 64'
Min. since last | Not | Not | Not | Not | Not | Not
SD radar search | in use | in use | in use | in use | in use | in use

A Number | 1 | 1 | 1 | 2 | 1 | 1
I
R Type | Unkn. | MAVIS | MAVIS | MAVIS | MAVIS | MAVIS
C | | Sub. | Sub. | float | Sub. | Sub.
R Probable mission | Unkn. | Search | Search | Search | Search | Search
A
F How contacted | SJ | Peri- | Peri- | Peri- | Peri- | Peri-
T | | scope | scope | scope | scope | scope

Initial range | 5,000 | 4,000 | 4,000 | 6,000 | 4,000 | 10,000
Elevation angle | Unkn. | 2° | 10° | 3° | 4° | 3°
Range & rel.brg. | Undet. | Undet. | Undet. | Undet. | Undet. | Undet.
when S/M detected

(State Beaufort) C Sea | 0 | 2 | 0 | 0 | 0 | 2
Q (Direction | (80°) | 060° | 000° | SW | W | SW
H (relative)
D Visibility (miles) | 40 | 20 | 40 | 15 | 20 | 40
T Clouds (Height | 2000 | 1500 | 3000 | 3000 | 4000 | 3000
I (in feet)
O Clouds (Percent | 100% | 90% | 20% | 90% | 75% | 100%
N (overcast)
S (Bearing | 270° | - | 285° | - | - | -
(relative)
(Moon angle | 60° | - | - | - | - | -
(Percent | 50% | - | - | - | - | -
(illum.

- 24 -
ENCLOSURE (A)

— page 64 —
CONFIDENTIAL

U.S.S. GUITARRO, Report of Second War Patrol.

(G) AIRCRAFT CONTACTS.

| Contact Number | #7 | #8 | #9 | #10 | #11 | #12 |
|---|---|---|---|---|---|---|
| Date | 19 Aug | 19 Aug | 20 Aug | 22 Aug | 25 Aug | 26 Aug |
| Time (Zone H) | 1500 | 1635 | 0720 | 1620 | 0640 | 1155 |
| Position: Lat. | 15-19N | 15-19N | 13-27N | 13-48N | 13-27N | 13-30N |
| Position: Long. | 119-55E | 119-55E | 120-02E | 120-02E | 120-13E | 120-17E |
| Speed | 2 | 2 | 2 | 2 | 2 | 2 |
| Course | 155 | 300 | 115 | 100 | 050 | 020 |
| Trim | 64' | 64' | 63' | 63' | 63' | 63' |
| Min. since last SD radar search | - | - | - | - | - | - |
| Number | 1 | 1 | 1 | 1 | 2 | 1 |
| Type | Bomber | NELL | LILY | NELL | RUFE | JAKE |
| Probable mission | Sub. Search | Sub. Search | Sub. Search | Trans-port | Sub. Search | Sub. Search |
| How contacted | Peri-scope | Peri-scope | Peri-scope | Peri-scope | Peri-scope | Peri-scope |
| Initial range | 12,000 | 10 Mi. | 10 Mi. | 10 Mi. | 3 Mi. | 3 Mi. |
| Elevation angle | 3° | 2° | 1° | 1° | 1° | 6° |
| Range & bearing | Undet. | Undet. | Undet. | Undet. | Undet. | Undet. |
| When S/M detected (State) | Undet. | Undet. | Undet. | Undet. | Undet. | Undet. |
| Sea (Beaufort) | 2 | 2 | 2 | 2 | 0 | 0 |
| Wind (Direction) | WSW | WSW | SSW | SW | SW | SW |
| Wind (relative) | - | - | - | - | - | - |
| Visibility (Miles) | 40 | 20 | 10 | 10 | 10 | 10 |
| Clouds (in feet) | 3000 | 3000 | 0-3000 | 3000 | 3000 | 3000 |
| Clouds (Percent overcast) | 100% | 100% | 100% | 100% | 70% | 50% |
| Moon (Angle) | - | - | - | - | - | - |
| Moon (Percent illum.) | - | - | - | - | - | - |

- 25 - ENCLOSURE (A)

— page 65 —
CONFIDENTIAL

U.S.S. GUITARRO, Report of Second War Patrol.

Contact Number | 13 | 14 | 15 | 16
S Date | 28 Aug | 1 Sep | 2 Sep | 3 Sep
U | | | |
B Time (Zone H) | 1305 | 0725 | 0920 | 1655
L | Lat. | 13-27N | 4-56N | 1-10N | 5-30S
A Position: | Long. | 119-55E | 119-42E | 119-44E | 117-07E
R | | | |
I Speed | 2 | 16 | 10 | 16.5
N | | | |
E Course | 090 | 165 | 005 | 215
Trim | 64' | surf. | surf. | surf.
Min. since last | | | |
SD radar search | 1 | 0 | 0 | 0
A Number | 2 | 1 | 1 | 1
I | | | |
R Type | SALLY | MAVIS | BETTY | Unkn.
C | Sub. | Sub. | Sub. | Sub.
R Probable Mission | Search | Unkn. | Search | Search
A | | | |
F How contacted | Periscope | Binoculars | SD & sight | SD & sight
T | | | |
Initial range | 7 Mi. | 17 Mi. | 18 Mi. | 10 Mi.

Elevation angle | 3° | 3° | 4° | 3°
Range & rel.brg. | | | |
when S/M detected | Undet. | Undet. | Undet. | Undet.
(State | | | |
C Sea( (Beaufort) | 1 | 0 | 1 | 2
O (Direction | | | |
N (relative) | SW | - | SE | SE
D | | | |
I Visibility (miles) | 8 | 20 | 50 | 20
T | | | |
I Clouds (Height | 4000 | - | 9000 | 4000
O (in feet | | | |
U (Percent | | | |
S (overcast | 85% | 1% | 7% | 80%
(Bearing | | | |
(relative) | - | - | - | -
Moon (Angle | - | - | - | -
(Percent | | | |
(illum. | - | - | - | -

Type of Submarine camouflage on this patrol: 32/3S-B

- 26 - ENCLOSURE (A)

— page 66 —
CONFIDENTIAL
(H)

U.S.S. GUITARRO Torpedo Attack No. 1 Patrol No. 2
Time 2053 (H) Date 7 August 1944 Lat. 14-51N Long. 119-59E
Target Data - Damage Inflicted.

Description:

SHIGURI class destroyer (DD) identified by its small aft
stack, its smooth lines aft of the number two stack and small nar-
row bridge structure. Estimated tonnage 1379 tons.

Ship(s) Sunk:

None.

Ship(s) Damaged or Probably Sunk:

None.

Damage Determined by:

None.

Target draft 9'3" Course 220°T Speed 15 kts. Range 1940 yds.

Own Ship Data

Speed 10 kts. Course 115°T Depth (Surface) Angle 0°.

Fire Control and Torpedo Data

Type Attack:

This attack was made on the surface on a hazy dark night which
allowed a favorable firing range. Target was among outer con-
screens and was making wide "S" sweeps at twice convoy speed, about
ten miles out from convoy. For some unknown reason the target
zigged radically toward just after we fired although he had appar-
ently steadied down one minute prior to firing. He may have heard
the torpedoes fired. The slow speed of the Mk.18-1 allowed him
plenty of time to turn enough to avoid and make the torpedoes miss
ahead.

- 27 - ENCLOSURE (A)

— page 67 —
CONFIDENTIAL

TORPEDO ATTACK No. 1
                                        #1          #2          #3
Tubes fired                             A1          A2          A3
Track angle                             74 S        75 S        75 S
Gyro angle                              002         004         003
Depth set                               5'          5'          5'
Power                                   Electric    Electric    Electric
Hit or miss                             Miss        Miss        Miss
Erratic                                 No          No          No
Mark torpedoes                          18-1        18-1        18-1
Serial                                  54728       54319       54889
Mark exploder                           8-5         8-5         8-5
Serial                                  8631        8099        8080
Actuation set                           Impact      Impact      Impact
Actuation actual                        -           -           -
Mark warhead                            18-2        18-2        18-2
Serial                                  1810        2565        2617
Explosive                               Tpx.        Tpx.        Tpx.
Firing interval                         10 seconds.
Type spread                             Divergent
Sea Conditions                          Choppy
Overhaul activity                       Submarine Repair Unit Torpedo Shop,
                                        Fremantle, West Australia.
Remarks                                 All torpedoes missed ahead. Target turned
                                        toward radically after firing.

                                        - 28 -                      ENCLOSURE (A)

— page 68 —
CONFIDENTIAL
(B)
TORPEDO ATTACK REPORT
U.S.S. GUITARRO Torpedo Attack No. 2 Patrol No. 2
Time 2102(H) Date 7 August 1944 Lat. 14-51N Long. 119-51E.

Target Data - Damage Inflicted

Description:

FUBIKI class AMAGIRI type DD (EC) identified by its two large
stacks, raised after gun and vacant space amidships aft of #2
stack. This DD was 2500 yards on the port quarter of the DD fired
at several minutes earlier.

Ship(s) Sunk:

One FUBIKI - AMAGIRI class DD, 1650 tons.

Ship(s) Damaged or Probably Sunk:

None.

Damage Determined by:

Heard and observed all three hits. Target was demolished by
the three hits which set off its depth charges, blew off its bow
and broke its back between the stacks. A tremendous magazine
explosion lighted up the sky and made mill work out of what was
left of the hull. Observed the hulk sink.

Target draft 9'9" Course 140°T Speed 8 kts. Range 1430 yds.

Own Ship Data

Speed 11 kts. Course 040°T Depth (Surface) Angle 0°.

Fire Control and Torpedo Data

Type Attack:

This attack was a night surface radar attack made only ten
minutes after firing at the DD of torpedo attack #1. This DD had
been plotted in only approximately using PPI ranges and bearings
during the approach on the first DD. Due to flank speed and rapid
swinging of the boat, no information was available until we stead-
ied. The control party obtained only three ranges and bearings
before the firing bearing was obtained. The target evidently
heard or saw nothing although our turn away after firing took us
within 1100 yards of the target.

- 29 - ENCLOSURE (A)

— page 69 —
CONFIDENTIAL

                                        TORPEDO ATTACK No. 2

Tubes fired             | #4      | #5      | #6
Track angle             | 92 S    | 93 S    | 93 S
Gyro angle              | 030     | 031.5   | 032
Depth set               | 5'      | 5'      | 5'
Power                   | Electric| Electric| Electric
Hit or miss             | Hit     | Hit     | Hit
Erratic                 | No      | No      | No
Mark torpedo            | 18-1    | 18-1    | 18-1
Serial                  | 54878   | 54844   | 54569
Mark exploder           | 8-5     | 8-5     | 8-5
Serial                  | 8332    | 8311    | 8409
Actuation set           | Impact  | I.pact  | Impact
Actuation actual        | Impact  | I.pact  | Impact
Mark warhead            | 18-2    | 18-2    | 18-2
Serial                  | 2557    | 1867    | 2577
Explosive               | Tpx.    | Tpx.    | Tpx.

Firing interval         9½ seconds.
Type spread             Divergent
Sea conditions          Choppy
Overhaul activity       Submarine Repair Unit Torpedo Shop,
                        Fremantle, West Australia.
Remarks                 None.

- 30 -                                  ENCLOSURE (A)

— page 70 —
CONFIDENTIAL
(H)
U.S.S. GUITARRO
Time 1029(H) Date 10 August 1944 Lat. 10-17N Long. 119-46E.

TORPEDO ATTACK REPORT
Torpedo Attack No. 3
Patrol No. 2

Target Data - Damage Inflicted

Description:
  KATORI class CL (EC) identified by its high bow and freeboard,
  single straight stack, its amazing resemblance to the former U.S.S.
  HOUSTON when sharp angles on the bow were presented, and the prom-
  inent catapult amidships. Estimated 6000 tons.
  One medium MFM type AK (EU), heavily laden with small escort
  on the port bow, distance 3000 yards. The above listed CL
  with escort on its port quarter. Estimated 4000 tons.

Ship(s) Sunk:
  None.

Ship(s) Damaged or Probably Sunk:
  One KATORI class CL - probably sunk.
  One medium MFM type AK - damaged.

Damage determined by:
  Timed one and possibly two hits to the range of the cruiser
  followed by a heavy rumbling explosion and several smaller ex-
  plosions. U.S.S. RATON later reported seeing our target enveloped
  in flame and black and white smoke and in serious trouble. Due
  to the explosive nature of the gasoline, torpedoes and ammunition
  cargo carried by this cruiser, it is believed to have exploded and caught
  fire. Medium AK and CL were overlapping at time of firing. One
  torpedo hit with a range 1000 yards greater than that of the CL
  and hit the overlapping AK 1000 yards on the cruiser's port
  bow. Subsequent periscope observation 1 1/4 hours later less than
  4000 yards from position of cruiser at time of hitting showed no
  evidence of attacked vessels, nor smoke of burning.

Target draft 19'8" Course 009°T Speed 7 kts. Range 1620 yds.

Own Ship Data.
Speed 2 kts. Course 150°T Depth 65' Angle 1° down.

- 31 -
ENCLOSURE (A)

— page 71 —
CONFIDENTIAL
(B)
U.S.S. GUITARRO

TORPEDO ATTACK REPORT
Torpedo Attack No. 3 (Cont'd.) Patrol No. 2

Fire Control and Torpedo Data

Type Attack:

This was a daylight periscope attack in a glassy sea with air-
craft overhead only two miles off the coast from the beach
side. The original plan was to parallel the column of ships and
fire the stern tubes at the large ship and four bow tubes at the
next in line. As the angle on the bow increased this large ship
was identified as a light cruiser of the KATORI class. The ship
turned up for a stern tube shot and time of firing close at hand
so the situation had to be accepted. This maneuver was thwarted by
a heretofore unseen column of ships closer to the beach with a very
angle on the bow and limited the time allotted for firing. An
escort was then only 1400 yards away with a zero angle on the bow made
it necessary to go deep.

- 32 -

ENCLOSURE (A)

— page 72 —
CONFIDENTIAL

                                        TORPEDO ATTACK No. 3

Tubes fired                             #7          #8          #9          #10
Track angle                             102 S       105 S       104 S       107 S
Gyro angle                              140         143         141         145
Depth set                               8'          8'          8'          8'
Power                                   Electric    Electric    Electric    Electric
Hit or miss                             Hit         Miss        Hit         Hit
Erratic                                 No          No          No          No
Mark torpedo                            18-1        18-1        18-1        18-1
Serial                                  54641       54978       54345       54672
Mark exploder                           8-5         8-5         8-5         8-5
Serial                                  8617        8280        8335        8307
Actuation set                           Impact      Impact      Impact      Impact
Actuation actual                        Impact      --          Impact      Impact
Mark warhead                            18-2        18-2        18-2        18-2
Serial                                  2559        2500        1793        1829
Explosive                               Tpx.        Tpx.        Tpx.        Tpx.
Firing interval                         10 seconds.
Type spread                             Divergent
Sea conditions                          Calm
Overhaul activity                       Submarine Repair Unit Torpedo Shop,
                                        Fremantle, West Australia.
Remarks                                 Two hits in cruiser, one miss ahead, one hit
                                        in overlapping AK. Miss due to applied spread.

                                        - 33 -                                ENCLOSURE (A)

— page 73 —
CONFIDENTIAL
(F)

U.S.S. GUITARRO
Time 1237(H)

TORPEDO ATTACK REPORT
Torpedo Attack No. 4
Patrol No. 2
Date 10 August 1944 Lat. 16-17N Long. 119-46E.

Target Data - Damage Inflicted

Description:
FUPUKI - HIBIKI class DD (EC) identified by its very small
forward stack, raised after gun and stepped bridge structure. When
at first it was believed to have been a TERUTSUKI class DD
because the small stack forward was not visible at large angles on
the bow. When target presented a 90° angle on the bow the small
stack was an immediate identifying feature. Estimated 1850 tons.

Ship(s) Sunk:
One FUPUKI - HIBIKI class DD, 1850 tons.

Ship(s) Damaged or Probably Sunk:
None.

Damage Determined by:
Saw and heard two torpedoes hit, demolishing the forward part
of the ship as ship exploded. When last seen only a small portion
of the ship's stern was left out of the water.

Target draft 9'9" Course 090°T Speed 7 kts. Range 2000 yds.

Own Ship Data

Speed 2.5 kts. Course 220°T Depth 65' Angle 0°.

Fire Control and Torpedo Data

Type Attack:
This was a daylight periscope approach made on a destroyer of
an organized search group which was attempting to keep us down
while a convoy cleared. The Commanding Officer brought the ship
up from deep submergence still rigged for silent running. The new
connection to the TDC from the gyro supply allowed us to get a
rapid set up before cutting in the lighting motor generator to
energize the firing circuit. As soon as firing was accomplished
the periscope was secured and we were again rigged for silent
running.

- 34 -
ENCLOSURE (A)

— page 74 —
CONFIDENTIAL
TORPEDO ATTACK No. 4

|                       | #1      | #2      | #3      | #4      |
| :| :------ | :------ | :------ | :------ |
| Tubes fired           |         |         |         |         |
| Track angle           | 95      | 96      | 96      | 98      |
| Gyro angle            | 314.5   | 313     | 314     | 311     |
| Depth set             | 5'      | 5'      | 5'      | 5'      |
| Power                 | Electric| Electric| Electric| Electric|
| Hit or miss           | Miss    | Hit     | Miss    | Hit     |
| Erratic               | Yes     | No      | No      | No      |
| Mark torpedo          | 18-1    | 18-1    | 18-1    | 18-1    |
| Serial                | 54935   | 54371   | 55644   | 55052   |
| Mark exploder         | 8-5     | 8-5     | 8-5     | 8-5     |
| Serial                | 8207    | 8207    | 8207    | 8207    |
| Actuation set         | Impact  | Impact  | Impact  | Impact  |
| Actuation actual      | -       | Impact  | -       | Impact  |
| Mark warhead          | 18-2    | 18-2    | 18-2    | 18-2    |
| Serial                | 2378    | 2436    | 2427    | 2432    |
| Explosive             | Tpx.    | Tpx.    | Tpx.    | Tpx.    |
| Firing interval       | 0 sec.  | 11 sec. | 19 sec. | 30 sec. |
| Type spread           | Periscope divergent                     |
| Sea conditions        | Calm                                    |
| Overhaul activity     | Submarine Repair Unit Torpedo Shop,     |
|                       | Fremantle, West Australia.              |
| Remarks               | No. 1 torpedo stopped running after 700 yards. |
|                       | It is believed that a short circuit possibly |
|                       | due to long firing took place. Other misses |
|                       | due to applied spread.                  |

- 35 -                                                    ENCLOSURE (A)

— page 75 —
CONFIDENTIAL
(H)
U.S.S. GUITARRO

TORPEDO ATTACK REPORT
Torpedo Attack No. 5                                Patrol No. 2

Time 0721(H) Date 21 August 1944 Lat. 13-21N Long. 120-18E.

Target Data - Damage Inflicted

Description:

An MFM type AK with a high raked bow and high stack. The
absence of goal posts on AK this size makes identification diffi-
cult when observed against a land background. Target length about
435 feet well determined by comparison with two large tankers in
column. The curve at the main deck lines was very evident.

Ship(s) Sunk:

One AK of the KUTAYAMA HARU type (EC), 6000 tons.

Ship(s) Damaged or Probably Sunk:

None.

Damage Determined By:

Two times hits at which time targets screws stopped (never to
start again) followed by loud groaning and breaking up noises which
lasted twenty minutes. Investigation later at the position of
sinking revealed a great amount of debris such as a life boat, a
broken cradle, stateroom doors, ice box door, cork, fuel oil and
planking, etc. It is believed this ship was utilized to carry
fuel oil.

Target draft 25' Course 010°T Speed 7.5 kts. Range 4,230 yds.

Own Ship Data

Speed 3.2 kts. Course 090°T Depth 64' Angle 0°.

Fire Control and Torpedo Data

Type Attack:

This was a daylight periscope approach made very soon after
sunrise. The attack was almost lost due to a large target zig.
The coast making it necessary to pull very high speeds to
close the target group to make depth. The escorts had deserted the target group to
make depth charge attacks on submarines to the south or the
east. The GUITARRO might not have been able to get in undetected at such
high speed with abnormally good sound conditions. A wakeless
torpedo was an asset.
- 36 - ENCLOSURE (A)

— page 76 —
CONFIDENTIAL
TORPEDO ATTACK No. 5

| | #1 | #2 | #3 | #4 |
| :| :----- | :----- | :----- | :----- |
| Tubes fired | #1 | #2 | #3 | #4 |
| Track angle | 059 | 060 | 062 | 061 |
| Gyro angle | 036 | 039½ | 036 | 038 |
| Depth set | 8' | 8' | 8' | 8' |
| Power | Electric | Electric | Electric | Electric |
| Hit or miss | Hit | Miss | Hit | Miss |
| Erratic | No | No | No | No |
| Mark torpedo | 18-1 | 18-1 | 18-1 | 18-1 |
| Serial | 54611 | 54378 | 54950 | 54938 |
| Mark exploder | 8-5 | 8-5 | 8-5 | 8-5 |
| Serial | 8007 | 7981 | 8173 | 8407 |
| Actuation set | Impact | Impact | Impact | Impact |
| Actuation actual | Impact | - | Impact | - |
| Mark warhead | 18-2 | 18-2 | 18-2 | 18-2 |
| Serial | 1570 | 1556 | 1527 | 2464 |
| Explosive | Tpx. | Tpx. | Tpx. | Tpx. |
| Firing interval | 0 sec. | 1 sec. | 20 sec. | 37 sec. |
| Type spread | Periscope divergent |
| Sea conditions | Calm |
| Overhaul Activity | Submarine R repair at Torpedo Shop, |
| | Fremantle, W.A. Australia |
| Remarks | These torpedoes have not been charged in four |
| | days, yet ran a run of 2000 and 3550 yards. |
| | Misses due to poor spread. |

- 37 -
ENCLOSURE (A)

— page 77 —
CONFIDENTIAL
(H)
TORPEDO ATTACK REPORT
U.S.S. GUITARRO Torpedo Attack No. 6 Patrol No. 2
Time 1523(H) Date 27 August 1944 Lat. 12-47N Long. 120-06E.

Target Data - Damage Inflicted

Description:
Three coastal type tankers of about 2000 tons extremely light
and in column, not zigzagging. Only possible reason for lack of
escorts was the target draft. Target fired at was an engines aft
tanker similar to the ANAKASU MARU (ZC) but did not have the
bridge structure forward.

Ship(s) Sunk:
None.

Ship(s) Damaged or Probably Sunk:
None

Damage Determined by:
None.

Target draft 7' Course 195°T Speed 7 kts. Range 2470 yds.

Own Ship Data

Speed 2.5 kts. Course 134°T Depth 64' Angle 0°.

Fire Control and Torpedo Data

Type Attack:
This was a daylight periscope attack made without the harass-
ing presence of escorts. The torpedoes were set on four feet and
fired with a fairly good solution on the TDC. Sound tracked the
torpedoes on the correct bearing for over five minutes. It is
believed that one torpedo passed under the bow of the target and
one passed ahead.
One torpedo exploded after running eight minutes and thirty-
five seconds. This is the first end of run explosion we have de-
tected in the 31 Mk.18-1 torpedoes fired.

- 38 - ENCLOSURE (A)

— page 78 —
CONFIDENTIAL
TORPEDO ATTACK No. 6

Tubes fired #5 #6
Track angle 99 100
Gyro angle 343 342
Depth set 4' 4'
Power Electric Electric
Hit or Miss Miss Miss
Erratic No No
Mark torpedo 18-1 18-1
Serial 35062 54906
Mark exploder 8-5 8-5
Serial 7952 8075
Actuation set Impact Impact
Actuation actual - -
Mark warhead 18-2 18-2
Serial 2562 2515
Explosive Tpx. Tpx.
Firing interval 0 sec. 9 sec.
Type spread Periscope divergent.
Sea conditions Calm
Overhaul activity Submarine Repair Unit Torpedo Shop,
Fremantle, West Australia.
Remarks Believed #6 torpedo ran under the forward part
of target, as it was very shallow draft forward
(about 4'). No other reason for miss apparent.

- 39 - ENCLOSURE (A)

— page 79 —
CONFIDENTIAL
(H)

U.S.S. GUITARRO
GUN ATTACK REPORT
Gun Attack No. 1
Patrol No. 2
Time 1946(H) Date 8 August 1944 Lat. 15-16N Long. 119-57E

Target Data - Damage Inflicted

Sunk:
One 700 ton coastal type freighter similar to the MINATO MARU
listed in ONI 208-J revised. Ship passed close aboard during
afternoon and Commanding Officer compared features of this vessel
with the one listed in ONI 208-J revised.

Damaged or Probably Sunk:
None.

Damage Determined by:
Observed three hits in target. Saw target catch fire just
forward of the bridge structure and blaze brightly. Watched flames
slowly diminish as radar pip diminished. Flame went out just after
pip disappeared at a range of 4100 yards.

Details of Action
The GUITARRO had observed heavy coastal traffic for two days.
At 1600(H) sighted a column of coastal vessels and commenced trail-
ing. After dark we surfaced and went to four-engine speed to catch
the ships. All except the last ship in column were carrying weak
stern lights. Due to the dark night and mountainous background
nothing was visible except the small lights. Next to last ship in
column was picked and the stern light used as a point of aim with
radar reflection to compensate. SJ radar ranges and shots were
used and proved very effective.

Five rounds of high capacity ammunition were fired from our
4"/50 Cal. gun for three hits. Average range was
2600 yards. A calm sea made the shots very accurate and the high
capacity ammunition used caused loud explosions accompanied by a
bright flash of sparks.

- 40 -
ENCLOSURE (A)

— page 80 —
CONFIDENTIAL
(H)
U.S. GUITARRO
Time 1929(H) Date 27 August 1944 Lat. 12-28N Long. 119-57E.

GUN ATTACK REPORT
Gun Attack No. 2
Patrol No. 2

Target Data - Damage Inflicted

Sunk:
One 2000 ton coastal type tanker similar to the AMAKASU MARU
ONI 208-J revised, except that the bridge structure was missing.
Ship was observed through the periscope for some time, in fact an
abortive torpedo attack was made and comparisons were made with
other ships in ONI 208-J revised, this being the accepted one by
the Commanding Officer.

Damaged or Probably Sunk:
None.

Damage determined by:
Observed ten well placed hits and saw target catch fire.
Target commenced going down by the stern after he was hit the
fifth time. Target's rudder jammed and he commenced circling
while we pumped five more hits into him. When last seen he was
well down by the stern with his deck awash and was burning brightly
emitting clouds of white smoke.

Details of Action
This target was also the target of torpedo attack #6 and
torpedoes missed we commenced trailing at high speed. Surfaced at
dusk and went to four engine speed to overtake the ship. Com-
menced tracking on the SJ radar at 10,600 yards. The ship was lost
and filled the pointer's telescope at 1500 yards. The point of
aim was the waterline aft. At a range of 2700 yards opened fire.
The first shot was a hit and set him on fire about the pilot
house. The high capacity ammunition we are using starts nice fires.

The SJ radar spotted very effectively but due to choppy
sea some error was introduced because of difficult pointing. Twenty-
four rounds of high capacity and seven rounds of common ammunition
were fired from our Mk.9-Mod.23, 4"-50 Cal. gun for ten hits.
One round of 20 MM was fired and was also a hit. The after 20 MM
jammed after the first shot due to excess of peralkatone preserva-
tive used in the gun and magazines. The forward 20 MM was not used
because the tracers from this gun blind the 4" gun pointer and
trainer. In a dying flurry the target began to counter fire with
a machine gun (approx. .303 calibre) and a 4".7 gun before we
could get our .50 cal. and .30 cal. machine guns into action.

- 41 -
ENCLOSURE (A)

— page 81 —
CONFIDENTIAL
(H)
U.S.S. GUITARRO

GUN ATTACK REPORT
Gun Attack No. 2 (Cont'd.) Patrol No. 2
Average range for the engagement was 1700 yards.

Again during this action it was noted that 4" high capacity
ammunition starts fires shortly after hits are obtained.

- 42 - ENCLOSURE (A)

— page 82 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

(I) MINES.

     No mines were encountered.

(J) ANTI-SUBMARINE MEASURES AND EVASION TACTICS.

     Opportunity was afforded on one occasion to watch a depth
charge attack at a range of about four miles. The charges dropped
were very loud and subsequent depth charging after our own attack
on the convoy leads to a belief that heavier charges, in excess of
600 lbs. are being used.

     On another depth charge attack, after a search of many hours,
it may be interesting to note that the attacking vessel - which
almost scored direct hits - was lying to on the starboard bow,
neither pinging nor turning over his screws. On each quarter
pingers. When he came in on his dropping run his screws were not
heard on the sound gear - although a sweep had just been made -
yet his screws were heard through the hull just before dropping.
All hands in the conning tower were taken by complete - and un-
pleasant - surprise.

(K) MAJOR DEFECTS.

                                   Main Engines

     The parade of cracked liners on #1 and #4 engines continued
this patrol. Three more liners were renewed in one month on #1
engine, and both #1 and #4 engines are, at present, showing the
familiar signs indicating cracked liners.

     The cast iron liners on #1 and #4 engines were replaced with
chromium plated liners in New Orleans while enroute to PEARL. It
is believed that the liners furnished by General Motors at that
time were from a bad lot. To date seven liners have been changed
on #1 and #4 engines, while none have been changed on #2 and #3
engines. It is requested, and strongly urged, that the liners on
#1 and #4 engines remaining from the original New Orleans change
be replaced during this refit.

                                   Master Gyro Compass

     On the 15th of August, during normal surface operation, the
follow-up system stopped matching the master compass. During the
following few days the follow-up system was thoroughly checked.
A new power amplifier tube and two new grid rectifier tubes were
installed, but the system still refused to follow. Thus, it was
necessary on the last two torpedo attacks to feed the auxiliary

                                   - 43 -                               ENCLOSURE (A)

— page 83 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

gyro compass headings into the T.D.C. by manually twisting the
follow-up dial with the T.D.C. repeater energized.

Pitometer Log

This unit was a constant source of trouble this patrol. It
took the ship's force two weeks after refit to adjust the log so
that it would even approximate ship's speed. The C.O.C. repeater
was finally adjusted to read accurately at all speeds, but the con-
ning tower and T.D.C. remain erratic at low speeds.

(L) RADIO.

All radio equipment operated satisfactorily. VOXCALL only
usable for very short ranges, and this equipment will be thoroughly
checked.

(M) RADAR.

All radar equipment operated satisfactorily.

(N) SOUND GEAR AND SOUND CONDITIONS.

Sound conditions in general were very good. Both JT and
supersonic equipment performed satisfactorily.

(O) DENSITY LAYERS.

| Time & Date | Lat. & Long. | Surface Temp. | Remarks |
|---|---|---|---|
| 0530-H | 09-23N | 83° | Isothermal to 140 ft. Sharp decline to 80° |
| 29 Jul | 117-23E | | between 140 and 160 ft. |
| 0538-H | 09-59S | 83° | Isothermal to 180 ft. Sharp decline to 77° |
| 30 Jul | 118-09E | | between 180 and 200 ft. |
| 0527-H | 09-30N | 83° | Isothermal to 100 ft. Isoballast between 100 |
| 1 Aug | 119-29E | | and 170 ft. Isothermal from 180 to 240 ft. |
| 2100-H | 10-14N | 83° | Isothermal to 180 ft. Sharp decline to 76° |
| 7 Aug | 114-42N | | between 180 and 320 ft. |
| 1030-H | 10-59N | 84° | Gradual decline to 82° at 220 ft. Sharp de- |
| 10 Aug | 116-49E | | cline to 80° between 220 and 230 ft. Grad- |
| | | | ual decline to 76° between 230 and 330 ft. |
| 0627-H | 11-13N | 83° | Isothermal to 190 ft. |
| 12 Aug | 115-25 E | | |
| 0552-H | 11-14N | 82° | Isothermal to 160 ft. Slight decline to 81° |
| 13 Aug | 115-10E | | between 160 and 220 ft. |
| 0534-H | 11-16N | 84° | Isothermal to 80 ft. Isoballast to 140 ft. |
| 14 Aug | 115-26E | | Sharp decline from 82° to 75° between 140 |
| | | | and 200 ft. |

- 4 -
ENCLOSURE (A)

— page 84 —
The provided image is a page from a WWII submarine patrol report. Here's the transcription:

CONFIDENTIAL
U.S.S. GUITARRO, Report of Second War Patrol.

Time & | Lat. & | Surface | Remarks
Date | Long. | Temp. |
11 Aug | 17-54N | 84° | Isothermal to 90 ft. Sharp decline to 73°
16 Aug | 13-38N | 82° | between 90 and 130 ft.
19 Aug | 13-38N | 82° | Isothermal to 130 ft. Isoballast to 300 ft.
21 Aug | 13-38N | 84° | Isothermal to 100 ft. Isoballast to 140 ft.
24 Aug | 12-17N | 84° |

The above density layers were considered worthy of note as
indicating prevalent conditions in the localities concerned.

Note: 2000 lb. SET card. All depths indicated are SET blister
depths.

(P) HEALTH, FOOD AND HABITABILITY.

Health in general was excellent, the usual colds being con-
spicuous by their absence. One officer was on the sick list for
six days due to an old leg injury which did not convalesce properly.

Food and habitability were average. Meat obtained in FRE-

— page 85 —
CONFIDENTIAL
U.S.S. GUITAPRO, Report of Second War Patrol.

(T) FACTORS OF ENDURANCE REMAINING.

| Torpedoes | Fuel        | Provisions | Personnel |
| | | | |
| 4         | 8,000 gals. | 20 days    | 20 days   |

Limiting factor this patrol - Patrol terminated by operation
                                 order.

(U) REMARKS.

                                 Mark-18 Mod-1 Torpedoes.

This vessel carried a full load of Mk.18 Mod.1 torpedoes for
a second time. Many extra hours were spent placing torpedoes re-
board in a serviceable condition. Separate correspondence
has been initiated on this subject.

Of the twenty torpedoes fired ten hits were obtained, nine
misses, and one torpedo did not run properly, for a 50% hit per-
centage. Of the six attacks made four were daylight attacks at
such range that wakeless torpedoes were a decided asset.

                                 Main Engines - Lubricating Oil

It may be of interest to note that this vessel during a
year's operation of GM (278-A) engines has had no trouble with
bearing failures. Neither main bearings nor connecting rod bear-
ings have shown any signs of other than perfect condition. It is
believed this is due primarily to two factors. First, normal
operation of engines at 70-90 combination. Secondly, and this is
the point being brought out, deliberate practice of never running
the lubricating oil through the purifier or rather clarifier. The
lubricating oil used, Symbol 9370, is an additive oil, and clari-
fication of this oil destroys the additive and tends to emulsifi-
cation, with consequent poor lubricating qualities. After 300
hours use this lubricating oil is changed, in accordance with
standard procedure. Recent analysis of a sample of lubricating
oil used for 240 hours without clarification showed excellent con-
dition.

This procedure is in direct accord with the opinions of two
Standard Oil Company representatives, and although no Bureau of
Ships directive has as yet been received on this subject, operation-
al success obtained warrants mention of a method which may be of
great assistance to other submarines.

                                 - 16 -                                 ENCLOSURE (A)

— page 86 —
SUBMARINE SQUADRON EIGHTEEN

FC5-18/A16-3/(00) Care of Fleet Post Office
Serial 176 San Francisco, California,
17 September 1944

C-O-N-F-I-D-E-N-T-I-A-L

FIRST ENDORSEMENT to
USS GUITARRO (SS363) War
Patrol Report No. 2 dated
8 September 1944.

From: The Commander Submarine Squadron EIGHTEEN.
To: The Commander-in-Chief, UNITED STATES FLEET.
Via: (1) The Commander Submarines, SEVENTH FLEET.
 (2) The Commander SEVENTH FLEET.

Subject: U.S.S. GUITARRO (SS363) - Report of Second War
 Patrol - Comments on.

 1. This second patrol of the GUITARRO was conducted
in the area west of Luzon. For a period of 20 days the command-
ing officer acted as group commander of a coordinated sea-air
attack group consisting of GUITARRO and RATON. Upon departure
of the latter vessel the GUNNEL joined the GUITARRO for two days.

 2. The patrol was marked by six aggressive and highly
successful torpedo attacks and two gun actions. All torpedoes
fired were Mark 18-1.

 Attack No. 1 was a night surface attack on 7 August off
the Pescadores Islands on a SHIGURI type destroyer which was part
of the outer screen of a large and unusually heavily pro-
tected convoy. Four torpedoes were fired but a radical
change of course just after firing caused all torpedoes
to miss.

 Attack No. 2 was conducted ten minutes later against another
screening destroyer, a FUBUKI. The value of the wakeless
torpedo was amply demonstrated at this time since the
previous attack was undetected. On attack No. 2 three tor-
pedoes were fired and all hit, blowing up the destroyer.
A severe depth charging followed which prevented action
against the convoy.

 Attack No. 3 was conducted on 10 August against a large
convoy coming up the Luzon coast. Four torpedoes were fired
in a day periscope attack against a KATORI class light
cruiser and an overlapping AK. Two timed hits were made in
the KATORI and one in the AK. Another severe depth charg-
ing lasted two hours. Upon return to periscope depth the
rest of the convoy was seen going over the hill while two
destroyers were conducting a sound search close by.

- 1 -

— page 88 —
FCS-18/A16-3/(00)
Serial 0176

C-O-N-F-I-D-E-N-T-I-A-L
Subject: U.S.S. GUITARRO (SS363) - Report of Second War
         Patrol - Comments on.

                                        SUBMARINE SQUADRON EIGHTEEN

                                        Care of Fleet Post Office
                                        San Francisco, California,
                                        17 September 1944.

3.
         The GUITARRO will be refitted by the Submarine
Repair Unit, Fremantle W.A. The poor condition of the torpedoes
issued the GUITARRO before this patrol is being investigated.
The gyro compass and pitometer log will be placed in operating
condition. Cylinder liners on No. 1 and No. 4 main engines
will be replaced. Regarding the commanding officer's remarks on main
engine lubricating oil it is believed that the primary reason for
lack of bearing trouble is the fact that the engines have
been consistently operated at less than full power. However the
matter of not subjecting the lubricating oil to clarification
will be referred to the Bureau of Ships in separate correspond-
ence for consideration and recommendation.

4.
         The Squadron Commander heartily congratulates
the commanding officer, officers and crew of the GUITARRO for
this most aggressive and successful patrol. The high percentage
of hits, 10 out of 20 torpedoes fired, and the remarkable gun
performance indicates an exceedingly high state of training and
efficiency.

                                        [SIGNATURE: Eliot H. Bryant]
                                        ELIOT H. BRYANT.

— page 89 —
[HANDWRITTEN: 2420]

FE24-71/A16-3
Serial 01118
C-O-N-F-I-D-E-N-T-I-A-L

UNITED STATES NAVY
12a/pr
3 October 1944.

SECOND ENDORSEMENT to:
USS GUITARRO Conf. Ltr.
A16-3 Serial 037 dated
8 September 1944. Re-
port of Second War Patrol.

From:
To :
Via :
Subject:

The Commander Submarines, SEVENTH FLEET.
The Commander in Chief, UNITED STATES FLEET.
The Commander, SEVENTH FLEET.

U.S.S. GUITARRO (SS363) - Report of Second War
Patrol - Comment on.

1.
GUITARRO's Second War Patrol was conducted in the
SOUTH CHINA SEA off the West Coast of LUZON. The Commanding
Officer of GUITARRO, Lieutenant Commander E. D'H. HASKINS, U.S.N.
was in command of a Coordinated Search and Attack Group consist-
ing of GUITARRO and RATON.

2.
GUITARRO took advantage of every opportunity to
strike at the enemy. Two Fleet type destroyers and a medium AK
were sunk, and a Light Cruiser of the KATORI Class and a medium
AK were damaged, in skillful and aggressive torpedo attacks.
A small engine aft AK and a 700 ton coastal vessel were sunk by
gunfire in two well conducted night gun actions.

3.
The sinking of the HIBIKI Type destroyer in attack
No. 4 is considered the outstanding action of this patrol. A
Commanding Officer must possess the highest qualities of personal
courage, and complete confidence in his officers and crew, in order
to launch such an attack immediately after a severe depth
charging.

4.
GUITARRO conducted her submerged patrols from one
to two miles off the coast when patrolling the shipping routes off
the Coast of LUZON. This is necessary in order to intercept
coast-hugging convoys without the use of high submerged speeds.

5.
This patrol is designated "successful" for the
award of the Submarine Combat Insignia.

- 1 -
[HANDWRITTEN: 10 04246]

— page 90 —
FE24-71/A16-3
Serial 01118
C-O-N-F-I-D-E-N-T-I-A-L

UNITED STATES NAVY 12a/pr
3 October 1944.

SECOND ENDORSEMENT to:
USS GUITARRO Conf. Ltr.
FE24-71/A16-3 Serial 037 dated
8 September, 1944. Re-
port of Second War Patrol.

Subject: U.S.S. GUITARRO (SS363) - Report of Second War
Patrol - Comment on.

— page 91 —
UNITED STATES FLEET
COMMANDER SEVENTH FLEET

A16-3(F-5-4/whr)
Serial 02673                                                              23 OCT 1944

                                                                         Reg No. [HANDWRITTEN: 13887]
                                                                         R. S. No. [HANDWRITTEN: 10 0426]

CONFIDENTIAL

THIRD ENDORSEMENT to:
U.S.S. GUITARRO (SS363)
Conf. Ltr. A16-3 serial
037 of 3 Sept. 1944.

From:         Commander Seventh Fleet.
To :         Commander in Chief, United States Fleet.

Subject:      U.S.S. GUITARRO (SS363) - Report of Second War
              Patrol - Comment on.

1.            Forwarded.

2.            The Commanding Officer, officers and crew of
the GUITARRO are congratulated for the completion of a
highly successful war patrol.

                                                                         [SIGNATURE: C. E. Van Hook]
                                                                         C. E. VAN HOOK
                                                                         Deputy.

Copy to:
CO, U.S.S. GUITARRO (SS363)
ComSubSobs 7th Flt.
ComSubRon 18

— page 92 —
[STAMP: DECLASSIFIED - DOD DIR. 5200.9]
[STAMP: of 27 Sep 58]
[STAMP: BY [HANDWRITTEN: 92C] DATE [HANDWRITTEN: 4/12/77]]
[HANDWRITTEN: 1ST COPY]

SS363/A16-3
Serial 044
DECLASSIFIED

U.S.S. GUITARRO (SS363)
% Fleet Post Office
San Francisco, Cal.

16 November 1944.

From: The Commanding Officer
To: The Commander in Chief, United States Fleet.
Via: Official Channels.

Subject: USS GUITARRO, Report of War Patrol Number THREE.

Enclosure: (A) Subject Report.
(B) Track Chart. (original only)
(C) Target track charts. (original only)

1. Enclosures (A), (B) and (C), covering the third
war patrol of this vessel conducted in South China Sea area during
the period 8 October 1944 to 16 November 1944 are forwarded here-
with.

[SIGNATURE: F. D. H. Haskins]
F. D. H. HASKINS.

[HANDWRITTEN: 100823]

— page 93 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

(A) PROLOGUE.

Arrived FREMANTLE, WESTERN AUSTRALIA, from second war
patrol on 8 September 1944 and commenced refit by Submarine
Repair Unit, Navy #137. During this period VHF, a DFM
AFR analyzer, and independent pumps for main engine cooling
were installed.

Sound tests were held and noisy stern plane gearing re-
placed.

Ready for sea and departed FREMANTLE on 8 October 1944
with a full load of Mark 18, Mod. one torpedoes.

(B) NARRATIVE.

8 October

1325(H) Underway from FREMANTLE, WESTERN AUSTRALIA, for THIRD war
patrol in accordance with COMMANDER TASK FORCE SEVENTY-ONE
operation order. Met escort, H.M.A.A.S. PARKES at harbor
entrance. Conducted training day and night approaches and
at
2312(H) Released escort and headed north in company with BATFISH.

9 - 10 October

Enroute FREMANTLE to EXMOUTH GULF, WESTERN AUSTRALIA.
Conducting training dives, drills and radar tracking with
BATFISH enroute.

11 October

0137(H) Sighted light on NORTHWEST CAPE.
0800(H) Moored port side to USS Y-10 in EXMOUTH GULF. BATFISH along
other side of tanker.
1900(H) Underway from alongside USS Y-10.
2053(H) Cleared NORTHWEST CAPE and proceeded independently for
patrol area.

12 - 13 October

Underway EXMOUTH GULF to MALAY BARRIER, conducting train-
ing enroute.

- 1 -

— page 94 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

                                        14 October

1003(H) Sighted and exchanged recognition signals with friendly
        submarine
1450(H) Sighted coast of BALI.
1558(H) Dived.
1830(H) CRANSTON, Richard L., #250-73-58, EM2c, USN., died;
        diagnosis pneumonia(du).
1902(H) Surfaced.
1953(H) Held services for Burial at Sea and committed the body of
        the deceased to the deep.
2200(H) Commenced transit of LOMBOK STRAIT.
2317(H) Radar contact on patrol boat, range 10,500 yards, bearing
        065°T. (Ship Contact #1) Evaded on surface.

                                        15 October

0130(H) Completed transit of LOMBOK STRAIT.
0519(H) Dived.
0807(H) Sighted friendly submarine bearing 299°T, range 6,000 yards
        on a southerly course.
1231(H) Surfaced.
1437(H) Sighted friendly submarine south bound and passed at 12,000
        yards.

                                        16 October

0206(H) Radar contact on friendly submarine south bound. Passed at
        8,000 yards.
0515(H) Dived.
0652(H) Sighted sampan bearing 142°T, distance 4,000 yards. (Ship
        Contact #2)
1603(H) Sighted sampan bearing 205°T, distance 5,000 yards. (Ship
        Contact #3)
1853(H) Surfaced and stood up between BORNEO and CELEBES.
1940(H) Radar interference from friendly submarine bearing 032°T.
2035(H) Radar contact on patrol boat bearing 045°T, distance 12,000
        yards. (Ship Contact #4) Evaded on surface.
2130(H) Radar contact on patrol boat bearing 021°T, distance 12,500
        yards. (Ship Contact #5) Evaded on surface.

                                        17 October

0120(H) Radar contact on patrol boat bearing 098°T, distance 10,500
        yards. (Ship Contact #6) Evaded on surface.

                                        - 2 -                                 ENCLOSURE (A)

— page 95 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

17 October

0504(H) Dived.
1910(H) Surfaced.

18 October

0038(H) Crossed Equator.
0516(H) Dived.
1905(H) Surfaced.

19 October

Passed into CELEBES SEA.
0805(H) Dived.
1857(H) Surfaced.
2000(H) Commenced transit of SIBUTU PASSAGE.
2230(H) Completed transit. Headed up SULU SEA.

20 October

0605(H) Dived.
1326(H) Surfaced.
1345(H) Sighted ship believed to be enemy CA, bearing 055°T, distance
          16,000 yards. (Ship Contact #1)
1357(H) Dived and commenced approach. Ship making 22 knots. Un-
          able to close.
1425(H) Surfaced and chased at high speed. Ship disappeared on
          northeasterly course.
1509(H) Sighted friendly submarine on southerly course bearing 125°T
          distance 18,000 yards.
1528(H) Radar contact on aircraft at 15 miles. (Plane Contact #1)
1529(H) Sighted bomber.
1540(H) Plane disappeared at 21 miles.
2030(H) Radar interference from friendly submarine bearing 345°T.
          Exchanged recognition signals and calls by radar.

21 October

0628(H) Radar contact on aircraft at 10 miles, closing. Dived.
          (Plane Contact #2)
1840(H) Surfaced and stood up through CUYO PASS.

22 October

0500(H) Dived.

-3-
ENCLOSURE (A)

— page 96 —
CONFIDENTIAL
U.S.S. GUITARRO. Report of Third War Patrol.

22 October

1831(H) Surfaced.
1930(H) Radar interference from friendly submarine bearing 050°T.
2105(H) Sighted two spherical objects 100 yards away identified as
     floating mines. Maneuvered carefully and soon discovered
     at least twelve of these directly in our track. The moon
     set and navigation through a floating mine field with only
     the radar was too nerve racking, so at
2131(H) Dived. Later analysis leads to the belief that the enemy,
     desiring to use MINDORO STRAIT themselves on the night of
     the 23rd, had loosed floating mines to deny the use of the
     strait to our ships until then, the mines being self-
     destroying would be gone before time had arrived for de-
     sired passage.

23 October

0044(H) Surfaced and continued through MINDORO STRAIT.
0118(H) Radar contact on friendly submarine bearing 045°T, range
     10,700 yards. Exchanged recognition signals.
0509(H) Dived.
0650(H) Sighted two DAVTS to north, distance 4 miles. (Plane Contact
     #3)
0850(H) Sighted two RUPTS to west, distance 4 miles. (Plane Contact
     #4)
0855(H) Sighted three NEILS to west, distance 1 mile, very low.
     (Plane Contact #5)
0925(H) Sighted one JAKE to west, distance ½ mile. (Plane Contact
     #6)
1110(H) Sighted one JAKE to southwest, distance 2 miles. (Plane
     Contact #7)
1852(H) Surfaced.
1906(H) Made radar contact on convoy bearing 308°T, distance 22,500
     yards. (Ship Contact #8) Commenced tracking.
     Convoy was made out to consist of three medium AKs and
     three escorts. The leading escort a CHIDORI type, the
     others DEs. Convoy was heading southward toward shoal water
     off CALAMIAN GROUP, thence down either toward CORON BAY or
     the west coast of PALAWAN.
     The moon was bright and surface attack impossible. Con-
     voy would reach shoal water before moonset, so solved for
     base course and got on the target track at 14,000 yards.

- 4 -
ENCLOSURE (A)

— page 97 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

23 October

1953(H) Dived to radar depth and commenced approach. Base course
          150°T, speed 8 knots. Range decreased to 8,000 yards when
          target group for no apparent reason made a radical zig
          away to his right. At
2046(H) Minimum range 6,300 yards, range to trailing escort 5,400
          yards. Unable to close to firing range and unable to sur-
          face because of visibility conditions until range had
          opened. At
2215(H) Sound picked up screws and radar a contact at 17,500 yards,
          bearing 320°T. (Ship Contact #9) Range on this con-
          tact was closing, and although the moon was not quite down
          it was a case of now or never, so at
2225(H) Surfaced.
          Target group which we had attempted to close was seven
          miles to south and would be in shoal water before we could
          catch them. Commenced tracking new contact.
          Had at first supposed new contact was second section of
          the same convoy and expected an opportunity to make a sur-
          face attack on our unsuspecting friends.
          New contact as seen on the screen when we surfaced con-
          sisted of 15 to 20 ships, very large and making high speed.
          Made sight contact at 16,000 yards - no moon - on ten ships
          and made out the tops of three BBs. Contact developed into
          a task force making 18 knots, base course 080°T. Loud
          noises on the APR indicated close radar. GUITARRO sent
          contact report and joined the formation. We were inside
          the outer screen, one DD of which was on our starboard bow.
          Enemy main body on port beam. Surface attack was impos-
          sible both because of enemy radar and high speed. Target
          course led just south of CALAVITE. Indications were that
          this task force was headed for our landings at LEYTE. They
          had three probable routes. One - around CALAVITE and
          through VERDE ISLAND PASSAGE. Two - on up to MANILA in-
          stead. Three - by making a radical course change they
          could head down through MINDORO STRAIT. If the first two,
          any chance of our making a submerged attack from ahead was
          out, and we could only send a report on course to take
          the third, then we might rush due east and submerge ahead.
          We were making flank speed on four engines and gaining very
          slowly.
          It was apparent that the Japs had us on radar. Every
          time the range closed to 15,000 yards one large ship and a
          smaller one beside it would leave the formation as seen on

- 5 -
ENCLOSURE (A).

— page 98 —
pp
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

                                                                23 October

the screen and head over towards us. When we would change
course 50° and open the range, they would return to the
formation. This happened four times during the three hour
endurance run.

                                                                24 October

        The Japs had apparently been on a deception course in-
tended to mislead anyone spotting them before changing to
their intended route, for at
0130(H) Formation changed course to southeast and commenced closing
        the range. At
0139(H) With range 13,000 yards, dived to radar depth. Unable to
        close to less than 9,500 yards. At
0250(H) Surfaced and sent contact report. Unable to reach area by
        tomorrow so headed up off CALAVITE for submerged patrol.
0500(H) Dived and ran in to two miles off CAPE CALAVITE.
1025(H) Sighted masts and commenced approach. (Ship Contact #10)
        This turned out to be one of the two outstanding heart-
        breakers on this patrol. Target group turned out to con-
        sist of two ships, a NATORI class light cruiser, with an
        ATACO class heavy cruiser slightly on her starboard quarter
        unescorted. Pulled high speed and did everything but jump
        up and down and scream - and maybe a little of that - only
        to see them go by out of firing range at 20 knots. Minimum
        range 5,500 yards. They seemed to avoid C LAVITE - pos-
        sibly because of the many sinkings which have occurred
        close inshore - delicately curved around us and disappeared
        heading down MINDORO STRAIT.
1043(H) Sighted RUFE to southwest, distance three miles. (Plane
        Contact #8)
1145(H) Sighted two PETES to southeast, distance three miles.
        (Plane Contact #9)
1220(H) Sighted RUFE to northeast, distance five miles. (Plane
        Contact #10)
1522(H) Sighted three RUFES to east, distance one mile. (Plane
        Contact #11)
1849(H) Surfaced. This particular spot is hot with air patrols,
        all looking for submarines. Sent contact report.
        Stood up toward area.
2100(H) Received message changing our assigned area.
2300(H) On station north of LUBANG.

                                - 6 -                                 ENCLOSURE (A)

— page 99 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

25 October

0458(H) Dived.
0640(H) Sighted JAKE to west, distance 2 miles. (Plane Contact
     #12)
0652(H) Sighted two JAKES to west, distance 2 miles. (Plane Contact
     #13)
0903(H) Sighted PETE to southwest, distance 8 miles. (Plane Contact
     #14)
0940(H) Sighted JAKE to north, distance 2 miles. (Plane Contact
     #15)
0945(H) Sighted formation of four JAKES, to east, distance 4 miles.
     (Plane Contact #16)
1841(H) Surfaced.
1900(H) Strong indication on APR indicating radar equipped plane.
     Increased in intensity so at
1904(H) Dived.
1916(H) Surfaced. Indication gone.
2018(H) Radar interference indicating friendly submarine. Exchanged
     recognition signals and calls.

26 October

     Received message ordering change of station so at
0313(H) Headed south on three engines.
0507(H) Dived.
0715(H) Sighted unidentified plane to northeast, distance 15 miles.
     (Plane Contact #17)
1848(H) Surfaced.
1940(H) Radar contact on friendly submarine. Exchanged recognition
     signals and calls.
2103(H) Made SJ radar contact on unidentified aircraft to north,
     distance 11 miles. (Plane Contact #18).

27 October

     During the night had a grandstand seat at a large battle
     being waged on the other side of the PHILIPPINES. Gun-
     flashes lighted the sky almost continuously during the
     night.
0100(H) SJ radar contact on unidentified aircraft to northwest,
     distance 12 miles. (Plane Contact #19)
0339(H) Radar contact bearing 209°T, distance 10,000 yards. (Ship
     Contact #11)

     - 7 - ENCLOSURE (A)

— page 100 —
CONFIDENTIAL
U.S.S. CHATOPO, Report of Third War Patrol.

27 October

We were in bad water navigationally, in AMBULON PASS
with the mainland to the west and a reef to the right.
Contact was evidently a small patrol. At
0345(H) Dived to radar depth. Lost radar contact. Sound reported
two sets of screws and weak pinging from 185°T to 215°T.
0434(H) About nine explosions to the south.
0510(H) Lost contact on screws.
0558(H) Sighted masts of heavy ship believed to be cruiser to
southeast, range about nine miles. Disappeared over hori-
zon. (Ship Contact #12)
0650(H) Sighted unescorted destroyer, ASASHIO, bearing 100°T,
distance 12,000 yards. Unable to close to firing range.
(Ship Contact #13) We are now patrolling west of CORON BAY.
Heard several explosions during morning.
1852(H) Surfaced and sent message regarding probability of enemy
train at CORON BAY.

28 October

0230(H) Received orders to proceed north to join wolf pack. Headed
up.
0301(H) SJ radar contact on unidentified aircraft, bearing 310°T,
range 5 miles, closing. (Plane Contact #20)
0302(H) Dived.
0332(H) Surfaced.
0415(H) Radar contact on unidentified aircraft at 8 miles. (Plane
contact #21) Dived, and stayed down for the day.
1840(H) Surfaced and headed up to clear MINDORO STRAIT.

29 October

0510(H) Dived.
0825(H) Sound picked up screws bearing 280°T (Ship Contact #14).
Got on normal approach course and commenced periscope approach.
0837(H) Sighted masts.
0901(H) Identified ship as lone unescorted heavy cruiser, Aoba
class. This was the second great disappointment of the
patrol. Target was on course 280°T, speed 20 knots and in
spite of all we could do he passed beyond range and over
the hill. Minimum range 9,000 yards. Fifteen more minutes
half surface running this morning and we'd have had him. Either way
an hour less and we wouldn't have seen him. Neither way
could have made us feel better, except perhaps someone else
can get him from our contact report.

- 8 -
ENCLOSURE (A)

— page 101 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

                                                                29 October

1600(H) Sighted EMILY to westward, distance 3 miles. (Plane Con-
        tact #22).
1849(H) Surfaced. Sent contact report on cruiser.

                                                                30 October

        Heading north to rendezvous with BREAM off BOLINAO.
0152(H) Exchanged recognition signals with BREAM and commenced
        closing.
0326(H) Effected rendezvous with BREAM. Received orders by mega-
        phone and line-throwing gun.
0339(H) Headed west to take assigned patrol station twelve miles
        west of BOLINAO.
0425(H) On station.
0526(H) Dived.
0955(H) Sighted FITE to eastward, distance four miles. (Plane Con-
        tact #23)
1105(H) Sighted smoke on the horizon bearing 030°T. Commenced
        approach.
1115(H) Sighted RUFE in direction of smoke, distance ten miles.
        (Plane Contact #24)
1120(H) Sighted RUFE to eastward, distance eight miles. (Plane
        Contact #25)
1225(H) Sound picked up pinging bearing 035°T.
1300(H) Sighted convoy heading down the coast of LUZON. (Ship
        Contact #15)
1310(H) Heard two torpedo explosions followed by series of depth
        charges.
        Target group consisted of 7 AKs and 1 AP with about 5
        escorts, range 16,000 yards. Four aircraft overhead. Was
        unable to close to firing range in spite of high speed.
        Minimum range 9,000 yards. Watched target group pass by.
        The large AP was noticeably down by the bow, showing tor-
        pedo damage, but keeping formation third ship from the end,
        at 8 knots. Apparent scarcity of escorts later explained
        by sighting two which had been detached to work over BREAM.
1549(H) Sighted two FC type escorts to northwest searching and
        pinging. (Ship Contact #16) They headed down toward us
        slowly, pinging, and closest one passed 1,500 yards away.
1803(H) Surfaced and headed south at four engine speed to overtake
        convoy. Ran until south of CAPONES ISLANDS without making
        contact, so believed convoy had holed up in DASOL BAY for
        the night. Planned to await convoy off BOTOLAN POINT in
        the morning, so headed north slowly up the coast.

                                - 9 -                                 ENCLOSURE (A)

— page 102 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

31 October

0030(H) Reached patrol point off BOTOLAN POINT and patrolled until
0512(H) Dived and headed close inshore.
0753(H) Sound picked up pinging bearing 310°T. Sighted convoy
       bearing 324°T, range 12,000 yards. (Ship Contact #17)
Torpedo Commenced approach. Atmospheric conditions were very good.
Attack Sky overcast, raining, sea choppy. No aircraft visible.
#1     Convoy was in two columns heading down the coast. When
       first sighted all leading escorts were outboard of outboard
       column with GUITARRO inboard of inboard column. At
0814(H) Closest escort pulled over to inboard side of column with
       30° starboard angle on the bow. Decided to allow leading
       ships to pass and attempt shot at large AP sighted yester-
       day.
0817(H) Went to 100 feet to allow escorts - now two on our side of
       convoy, sharp on starboard bow - to pass overhead.
0835(H) Sound bearings indicated column course change toward us.
0844(H) Large ship went overhead.
0847(H) Periscope depth. We were now right in the middle of the
       convoy. See sketch (page 11). Situation as follows.
       GUITARRO was in outboard column of ships on opposite course.
0849(H) Columns had changed course 20° towards. Directly astern
       was an AK. Directly ahead were two AKs in column headed
       towards, closest ship about 2,000 yards. Escorts at 320°,
       240°, 160°, and 120° relative. Picked as first target a
       large flush-deck AK in inboard column bearing 095° relative,
       identified as TALON MARU type (MC) (Page 70 ONI 208-J re-
       vised), estimated at 8,000 tons. At
0850:42 Fired four stern torpedoes at above target. Shifted target
       to group composed of two large AKs (MU) one on port quarter
       of the other bearing 045° relative. Closest one about
       1,200 yards, outboard one about 2,500 yards. Got quick
       set-up and at
0851:54 Fired four bow tubes at this target group.
0852:00 Number three torpedo hit closest ship (on starboard bow)
       forward of stack.
0852:10 Number four torpedo hit same ship aft of stack.
0852:18 Number nine torpedo hit target on starboard quarter.
       Number ten torpedo hit same target. Run about 3,000 yards.
       This ship must have carried ammunition as it blew up
       amidships and practically disintegrated. At
0853:23 Number one torpedo hit outer ship on starboard bow at
       bridge.

- 10 -                                        ENCLOSURE (A)

— page 103 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

Additional ships astern.

GUITARRO.

- 11 -
ENCLOSURE (A)

— page 104 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

31 October

Swung periscope to take last look and ordered deep sub-
mergence as ship dead ahead was getting too close. Look
showed first target (stern tube shot) literally disinte-
grating, and close target with back broken, bow and stern
pointing in a "V", sinking. At
0853: Number two torpedo hit same target as number one - a time
hit with 2,300 yard torpedo run, followed by a tremendous
explosion. This ship was carrying ammunition and must have
gone in the air almost as far as MANILA. The shock was so
great at a range of 1,900 yards that the GUITARRO was
knocked down 50 feet in depth. Blue flame showed around
the periscopes and in the after engine room hatch. The
shock opened the vents on #1 F.O. and #3 F.O.B. tanks
showering the torpedo room and crew's mess with fuel oil.
The pit log sea connections were knocked off, spraying the
sound training M.C. with sea water, brushes were blown out
of the steering motor, valve wheels knocked off and the
usual light bulbs broken, etc. Several bits of metal rained
down and dropped against the hull forward.
The Commanding Officer never wishes to hit an ammunition
ship any closer than that one. Possible damage was done to
other ships in the convoy by the blast, but unfortunately
no information is available.
Went under the convoy.
0904(H) Finally eleven depth charges were dropped. The two ships
exploding must have disorganized the escorts, and as all
ships hit were on the inside column they thought us on the
beach side. Not close. Breaking up noises were heard on
the bearing of the closer ship and at
0935(H) Ceased. All three ships sank. Evaded to northeast.
1252(H) Periscope depth.
1522(H) Depth charges in the distance.
1840(H) Surfaced and headed back up to find rest of pack.

1 November

0315(H) Exchanged recognition signals with BREAM.
0422(H) Effected rendezvous. Received patrol station 60 miles west
of BOLINAO.
0800(H) Dived to rest today.
1811(H) Surfaced.

- 12 - ENCLOSURE (A)

— page 105 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

                                        2 November

             Received orders from BREAM to patrol inshore just north
             of DASOL BAY. Headed in.
0455(H) Dived.
1305(H) Sighted formation of five sampans heading down the coast.
             (Ship Contact #18)
1550(H) Sighted EMILY to eastward distance three miles. (Plane
             Contact #26)
1834(H) Surfaced.
1915(H) Received radar message from BREAM assigning patrol station
             tomorrow off CATONE ISLANDS. Headed down.

                                        3 November

0043(H) Sighted RATON coming up to join our pack. Exchanged
             recognition signals and information.
0417(H) Radar contact on BREAM coming down to take position.
0445(H) Dived, and headed close inshore.
1010(H) Sighted column of seven sail and three motor sampans head-
             ing down the coast. (Ship Contact #19)
1725(H) Sighted coastal vessel painted as hospital ship heading
             up coast close inshore. (Ship Contact #20)
1840(H) Surfaced.
1849(H) Exchanged calls with friendly submarine.
1921(H) Received orders from BREAM by radar, and headed back north
             toward BOLINAO.

                                        4 November

0507(H) Dived and headed close inshore north of DASOL BAY. BREAM
             to north of us and RATON still further north.
1130(H) Sighted one RUFE and two WELLS to southeast, distance four
             miles. (Plane Contact #27)
1327(H) Sighted three WELLS and one RUFE to east, distance four
             miles. (Plane Contact #28)
1532(H) Heard explosions to north.
1537(H) Sighted smoke bearing 007°T.
1538(H) Sound picked up pinging on same bearing.
1605(H) Sighted masts bearing 003°T. (Ship Contact #21) Commenced
             approach.

Torpedo Target group consisted of one large AP(EU) with four
Attack small craft which looked like heavily loaded LCTs. They
#2         had a ramp forward to let down. Two were on either
             side of the AP. The only escort visible - unless the LCTs
             acted as escorts - was a PC type which seemed busy charg-

                                        - 13 -
                                                              ENCLOSURE (A)

— page 106 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

                                                                4 November

ing around on the starboard quarter of the group. The AP
was constant helming rapidly on base course 180° speed 10.
Air cover for this group of ships - actually the AP was
the only real ship, unless a convoy was astern of her - was
very heavy. One float plane remained at about 500 - 800
feet as a spotter. Two bombers working as a pair, skimmed
the water about 50 feet off it, and another bomber did the
same on his own. Undoubtedly they all had voice communi-
cation and to be spotted was bad business.
                                                                At
1631(H) Sound reported four torpedoes running to north. BREAM was
         attacking. Watched target group.
1636(H) An explosion - probably torpedo end-of-run. One of the
         LCTs veered to the west and pulled out of formation, and
         slowed down.
1641(H) Got set up to shoot, target now making 10 - 11 knots, base
         course 190°T. It was a beautiful new ship, painted pearl
         gray but had entirely too much air cover to suit us.
1642(H) Fired four bow tubes with target showing an 80° starboard
         angle on bow.
1645:28 Watched #2 torpedo hit the AP in the engine room, throwing
         a large cloud of smoke, spray and steam in the air. Target
         which had about a 40° angle on bow when hit, slewed around
         another 20° - or was knocked around - and stopped. Its
         screws never turned over again. Torpedo run 3,100 yards.
1648(H) Sound reported screws of an escort. Looked to see target
         sagging down by stern and stopped. At
1650(H) Went deep and commenced evasion. Had been bucking a 1½ - 2
         knot southerly current off our point today, so evaded to
         south in the hope target would drift along. Also BREAM and
         RATON were to north.
1723(H) First depth charge, followed by a series of half-hearted
         ones.
1900(H) On the way up to periscope depth. Had heard no screws for
         almost an hour. Two loud ship explosions which sounded like
         boilers almost overhead, followed by very loud breaking-up
         noises. Our AP was coming down to join us. The surface
         current had moved her down at about the same speed as we
         had made at deep submergence. The ship was obviously
         breaking up almost overhead and pieces of metal were drop-
         ping down, hitting the hull forward and aft. Put on left
         full rudder and went ahead full, to get out of there before
         she sank on us. The ship above sank at an estimated dis-
         tance of not more than 1,000 yards from us and rocked us

                                        - 14 -                                        ENCLOSURE (A)

— page 107 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

4 November

gently as it went down.
Screws came in and milled around, probably picking up
survivors.
2005(H) Screws faded out.
2042(H) Periscope depth.
2110(H) Surfaced.

5 November

Received message from BREAM assigning patrol station
north of CAPONES ISLANDS. Headed south.
0157(H) Sighted lights of properly marked hospital ship which
headed down the LUZON coast. (Ship Contact #22) Avoided.
0453(H) Dived and headed close inshore.
0645(H) Sighted seven HELLS in formation to east, distance five
miles. (Plane Contact #29)
0700(H) Sighted ZERO to southeast, distance five miles. (Plane
Contact #30)
0738(H) Sighted masts of two ships to south. (Ship Contact #23)
Made ships out to be PC type anti-submarine vessels coming
up the coast searching. We were in a bad spot as we were
on the beach side of the two ships and could not possibly
get outboard, whereas our maneuverability to avoid was
practically nil in as close as we were to the beach. To
make it worse the inboard ship which had originally a ten
degree starboard angle gave us a zero angle, apparently to
inspect all such coves as we were in. At
0800(H) Rigged for silent running and went deep until the menace
had passed.
0837(H) Periscope depth. From looks of all the aircraft and anti-
submarine vessels the Nips mean to clean up this coast for
a while. Expected our two PCs back so headed out from
beach.
1047(H) Sighted masts of several vessels over horizon to southeast
with pinging on the same bearing. (Ship Contact #24) Un-
able to close.
1108(H) Sighted unidentified aircraft to east, distance five miles.
(Plane Contact #31)
1300(H) Intermittent explosions for the next twenty minutes, to the
north. Could be anything but sounds like depth charges.
1452(H) Sighted three unidentified bombers to northeast, distance
six miles. (Plane Contact #32)
1845(H) Surfaced.

- 15 -
ENCLOSURE (A)

— page 108 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

5 November

1945(H) Received message from BREAM by radar directing northerly
          course and patrol tomorrow just north of DASOL BAY. Headed
          up.
2345(H) Sighted ship bearing 042°T, distance about 16,000 yards,
          pinging. (Ship Contact #25) From our APR interference and
          its plotted position this is a patrol off DASOL BAY to
          guard the anchorage. Avoided.

6 November.

0102(H) Radar contact on BREAM.
0313(H) Exchanged information with BREAM.
0434(H) Radar contact bearing 090°T, distance 10,200 yards,
          believed to be same enemy patrol previously sighted.
0435(H) Dived. BREAM visible to north.
0525(H) Sighted sailboat bearing 135°T, distance 2,500 yards.
          (Ship Contact #26)
0645(H) Sighted NELL to south, distance three miles, very low.
          (Plane Contact #33)
0700(H) Sound reported pinging and screws bearing 170°T.
0710(H) Sighted second sailboat between us and beach bearing 090°T,
          distance 3,000 yards. (Ship Contact #26)
0714(H) Sighted smoke bearing 161°T.
0718(H) Sighted masts bearing 151°T. (Ship Contact #27) Commenced
Torpedo Attack. Convoy consisted of two heavy cruisers in column
          approach. Convoy consisted of two heavy cruisers in column
          with merchant ships astern and in column on the outboard
          side. As to escorts the Commanding Officer only saw three
          but on first sighting this convoy and seeing that fat
          cruiser, after being unable to get in on four cruisers
          previously during this patrol, there was only one target
          for us and the rest of the ships - except for leading
          escorts - could have been made of green cheese. I paid no
          attention to them. Also air cover with a calm sea with a
          swell made periscope exposures of short duration. Target
          appeared to be ATAGO class and was not zigzagging. Decided
          to fire bow and stern tubes simultaneously with offset
          spread so as to get the maximum concentration of torpedoes
          in the water as quickly as possible. At
0800(H) Outboard leading escort had a zero angle on the bow. At-
          tempted to get inside. At
0804(H) Sound reported outboard leading escort, now bearing 140°
          relative, had us on his sound gear and had shifted to short
          scale.

- 16 - ENCLOSURE (A)

— page 109 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

6 November

0805(H) Fired forward and after tube nests simultaneously (only
    three torpedoes aft) in pairs spraying the water with a
    gorgeous concentration of nine torpedoes (just as if
    ten) in 46 seconds, track angle 55° port, torpedo run
    3,600 yards. Went deep and rigged for depth charge attack.
0808:56 Timed Hit in cruiser, possibly two. It is believed
    #8 hit together but as there was only one explosion only
    one hit is claimed.
0809:10 Two timed hits in cruiser. Torpedoes #3 and #10.
0814(H) First depth charge followed by five more. This last
    right pert, had been right on us, and made a deliberate
    attack, consequently the last two really shook us up. He
    crossed from starboard quarter to port bow and obviously
    was an assistant professor of the Sound School. All the
    emergency lights were knocked out, and amidst the swaying
    and heaving of the ship the tinkling of broken glass and
    absence of lights, the Commanding Officer grabbed a flash-
    light, expecting to see main power fail and depth gage drop.
    Fortunately we maintained main power and only dropped fifty
    feet in depth. The enemy immediately lost contact and we
    crept away licking our wounds.
    It is naturally impossible and undesirable to list the
    three sheets of damage sustained but let it suffice to say
    both radars were knocked out - the SD for three days - the
    stern planes and steering knocked out of alignment, sound
    gear and radio gear and insulators damaged, all
    bridge electrical circuits out, all sea valves opened ½ to
    2 turns and the thick 1¼" pressure proof quartz in the
    bridge gyro repeater was smashed to smithereens.
0817(H) Several loud ship explosions on bearing of the heavy
    cruiser.
    Evaded to southwest.
0850(H) During next two hours heard intermittent depth charging not
    close to north.
1136(H) Periscope depth, all clear. We now have many new Christians
    on board.
1849(H) Surfaced and cleared area to west.
2048(H) Exchanged radar challenges and information with BREAM.
2200(H) Effected rendezvous with BREAM and exchanged information
    by megaphone and line-throwing gun.
2242(H) Received orders from BREAM to leave area and head for base.
    Headed south.

- 17 -
ENCLOSURE (A)

— page 110 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

                                                                7 November

0505(H) Radar interference from friendly submarine.
0520(H) Dived.
0737(H) Sighted friendly submarine bearing 070°T, circling, dist-
        ance 9,000 yards.
1841(H) Surfaced.
2000(H) Departed area.
2020(H) Exchanged recognition signals by radar with friendly sub-
        marine.

                                                                8 November

0234(H) Radar contact on vessel believed to be patrol, bearing
        107°T, range 10,500 yards. (Ship Contact #28) Evaded on
        surface.
0509(H) Dived.
0635(H) Sighted periscope bearing 200°T, distance 2,500 yards.
        (Ship Contact #29) Periscope on opposite course. Went
        to 150 feet.
0740(H) Periscope depth. Sighted another periscope bearing 205°T,
        distance 1,500 yards on opposite course. (Ship Contact
        #30). Went to 150 feet.
0840(H) Periscope depth.
1842(H) Surfaced.
2300(H) Made radar contact on patrol boat bearing 270°T, distance
        16,000 yards. (Ship Contact #31) Evaded on the surface.

                                                                9 November

        Heading down through SULU SEA.
1040(H) Radar contact on unidentified plane at 16 miles. Lost
        contact at 22 miles. (Plane Contact #34)
1145(H) Radar contact on unidentified plane at 17 miles. Lost
        contact at 18 miles. (Plane Contact #35)
1908(H) Radar contact on unidentified plane at 8 miles. (Plane
        Contact #36)
1930(H) Radar contact on unidentified plane at 5 miles, closing.
        (Plane Contact #37) Dived.
2007(H) Surfaced.
2305(H) Sighted lights of hospital ship bearing 190°T, distance 15
        miles. From appearance and spacing of lights this vessel
        appeared to be the same one sighted on 5 November off LUZON.
        It crossed ahead from east to west and headed up the north-
        east coast of BORNEO at 16 knots. (Ship Contact #31)

                                                                - 18 -
                                                                ENCLOSURE (A)

— page 111 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

                                                                10 November

0020(H) Commenced transit of SIBUTU PASSAGE.
0230(H) Completed transit and headed south into CELEBES SEA.
1130(H) During next four hours sighted seven small craft. Avoided
                 on surface. (Ship Contact #32)
1900(H) Headed down into MAKASSAR STRAIT.
2112(H) Crossed Equator.

                                                                11 November

0840(H) Sighted vessel believed to be "Q" ship. It was two
                 masted vessel with no stack, making 15 knots on various
                 courses. Evaded on surface. (Ship Contact #33)
1700(H) During the afternoon sighted ten sailboats and three small
                 patrol craft. Evaded on surface. (Ship Contact #34)
2135(H) Radar contact on friendly submarine. Exchanged recognition
                 signals and information by radar.

                                                                12 November

0200(H) Commenced transit of LOMBOK STRAIT.
0513(H) Dived.
1300(H) Completed transit.
1759(H) Surfaced and stood south.
1805(H) Sighted friendly submarine on northerly course. Exchanged
                 recognition signals and information.

                                                                13 November.

                 Enroute.

                                                                14 November.

1100(H) MILLER, James N., Flc, USN., was placed on the sick list;
                 diagnosis appendicitis.
1700(H) Sighted friendly submarine and exchanged recognition signals
                 and information.

                                                                15 November

                 Enroute.

                                                                16 November

1015(H) Moored alongside submarine nest, North Wharf, Fremantle, W.A.

                                                                ENCLOSURE (A).
                                                                - 19 -

— page 112 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

(C) WEATHER.
No unusual weather was experienced. Seas were for the
most part calm, sometimes very calm with a swell. Many rain squalls
encountered.

(D) TIDAL INFORMATION.
During the southward transit of LOMBOK a current of 1 -
2 knots to the south was encountered.

(E) NAVIGATIONAL AIDS.
None observed.

- 20 - ENCLOSURE (A)

— page 113 —
CONFIDENTIAL

U.S.S. GUITARRO, Report of Third War Patrol.

(F) SHIP CONTACTS.

Time Lat. & Type Initial Est.Course How con- Remarks
No. Date Long. Range & Speed tacted
1 2317-H 08-38.0S Patrol 10,500 010 15 R Avoided
  14 Oct 115-47.0E
2 0652-H 04-03.2S 2-masted 8,000 215 4 P
  16 Oct 118-04.0E sail sampan
3 1603-H 03-46.0S Sailing 5,000 100 4 P
  16 Oct 118-14.0E sampan
4 2035-H 03-30.0S Patrol 12,000 --- --- R Avoided
  16 Oct 118-30.0E
5 2135-H 03-14.0S Patrol 12,500 --- --- R Avoided
  16 Oct 118-32.0E
6 0120-H 02-40.0S Patrol 10,500 --- --- R Avoided
  17 Oct 118-33.0E
7 1345-H 06-36.0N War ships 16,000 050 16 P Attempted
  20 Oct 119-06.0E to close
8 1906-H 13-00.6N Convoy 22,500 150 8 R Attempted
  23 Oct 119-21.0E 6-8 ships to close
9 2225-H 12-58.7N Task Main group 080 18 R Attempted
  23 Oct 119-23.0E Force 17,500 to close
10 1025-H 13-34.0N 1 CA 10,000 140 18 P Attempted
   24 Oct 120-20.0E 1 CL to close
11 0339-H 12-02.2N 2 Escorts 10,800 110 22 R Avoided
   27 Oct 119-51.6E
12 0558-H 12-06.2N Cruiser 18,000 095 24 P Over the
   27 Oct 121-07.0E hill
13 0650-H 11-58.0N DD 12,000 085 20 P Over the
   27 Oct 120-58.2N ASASHIO hill
14 0837-H 14-24.2N Cruiser 16,000 280 20 P Over the
   29 Oct 119-45.5E AOBA hill
15 1300-H 16-09.2N Convoy 16,000 170 8 P Over the
   30 Oct 119-45.0E 11-12 ships hill
16 1549-H 16-11.7N 2 Patrol 14,000 135 12 P Pinging
   30 Oct 119-35.0E boats
17 0735-H 15-17.9N Convoy 12,000 160 8 P Sunk 3
   31 Oct 119-49.9E
18 1305-H 15-58.4N 5 Sailing 9,000 170 4 P Avoided
   2 Nov 119-44.9E sampans
19 1910-H 15-00.3N 7 Sail & 8,000 165 5 P Avoided
   3 Nov 119-57.0E 3 motor sampans
20 1735-H 14-56.3N Hospital 10,000 145 10 P Avoided
   3 Nov 120-01.2E ship
21 1605-H 16-03.0N Convoy 10,000 180 10 P Hit 1 AP.
   4 Nov 119-43.4E 5-6 ships

- 21 - ENCLOSURE (A)

— page 114 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

No. | Time Date | Lat. & Long. | Type | Initial Est. Range | Course & Speed | How contacted | Remarks
22 | 0157-H 5 Nov | 15-20.0N 119-40.2E | Hospital ship | 20,000 | 130 11 | SN | Avoided
23 | 0738-H 5 Nov | 15-02.6N 119-56.0E | 2 PC boat | 12,000 | 004 8 | P | Avoided
24 | 1047-H 5 Nov | 15-04.2N 119-59.3E | Convoy 4 ships | 14,000 | 330 9 | P | Attempted to close
25 | 2345-H 5 Nov | 15-47.4N 119-37.0E | Patrol | 16,000 | --- 12 | SN | Avoided
26 | 0710-H 6 Nov | 16-00.4N 119-43.0E | Sail boat | 3,000 | 350 5 | P | Avoided
27 | 0718-H 6 Nov | 15-54.7N 119-44.8E | Convoy | 14,000 | 340 12 | P | Damaged cruiser
28 | 0234-H 8 Nov | 12-26.8N 120-27.0E | Patrol | 10,500 | 225 15 | R | Avoided
29 | 0635-H 8 Nov | 12-02.2N 120-58.0E | Submarine | 2,500 | --- 2 | P | Avoided
30 | 0740-H 8 Nov | 12-00.7N 121-00.0E | Submarine | 1,500 | --- 2 | P | Avoided
31 | 2305-H 9 Nov | 05-12.0N 119-33.0E | Hospital ship | 22,000 | 330 18 | P | Avoided
32 | 10 Nov CELEBES SEA | | 7 Small boats | 12,000-16,000. | Var. Var. | SD | Avoided
33 | 0840-H 11 Nov | 03-28.0N 118-26.0E | C Ship | 14,000 | Var 15 | SD | Avoided
34 | 11 Nov MAKASSAR FLORES SEA & small patrol craft. | | 10 Sail Various | Various | Var Var | SD | Avoided

- 22 -
ENCLOSURE (A)

— page 115 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

(G) AIRCRAFT CONTACTS

| No. | Time Date | Lat. & Long. | Type | Initial Range(Miles) | How contacted. | Remarks |
|---|---|---|---|---|---|---|
| 1 | 1528-H 20 Oct | 06-34.0N 120-05.0E | Unk. | 15 | R | |
| 2 | 0628-H 21 Oct | 09-25.0N 121-33.0E | Unk. | 10 | R | |
| 3 | 0650-H 23 Oct | 12-49.0N 119-58.0E | 2 Rufe | 3 | P | |
| 4 | 0850-H 23 Oct | 12-49.0N 119-54.0E | 2 Rufe | 4 | P | |
| 5 | 0855-H 23 Oct | 12-49.0N 119-54.0E | 3 Nell | 15 | P | |
| 6 | 0925-H 23 Oct | 12-49.0N 119-53.0E | Jake | 8 | P | |
| 7 | 1110-H 23 Oct | 12-49.0N 119-49.0E | Jake | 2 | P | |
| 8 | 1043-H 24 Oct | 13-28.0N 120-15.0E | Rufe | 3 | P | |
| 9 | 1145-H 24 Oct | 13-28.0N 120-15.0E | 2 Pete | 3 | P | |
| 10 | 1220-H 24 Oct | 13-29.0N 120-19.0E | Rufe | 10 | P | |
| 11 | 1522-H 24 Oct | 13-29.0N 120-19.0E | 3 Rufe | 2 | P | |
| 12 | 0640-H 25 Oct | 14-02.0N 120-03.0E | Jake | 8 | P | |
| 13 | 0652-H 25 Oct | 14-00.0N 120-03.0E | 2 Jake | 1½ | P | |
| 14 | 0903-H 25 Oct | 14-02.0N 120-03.0E | Pete | 8 | P | |
| 15 | 0940-H 25 Oct | 14-02.0N 120-03.0E | Jake | 8 | P | |
| 16 | 0945-H 25 Oct | 14-02.0N 120-03.0E | 4 Jake | 4 | P | |
| 17 | 0715-H 26 Oct | 13-35.0N 119-52.0E | Unk. | 15 | P | |
| 18 | 2103-H 26 Oct | 13-02.0N 120-09.0E | Unk. | 11 | R | |
| 19 | 0100-H 27 Oct | 12-08.0N 120-53.7E | Unk. | 12 | R | |
| 20 | 0301-H 28 Oct | 11-57.8N 119-53.0E | Unk. | 5½ | R | |

- 23 -
ENCLOSURE (A)

— page 116 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

No. | Time | Date | Lat. & | Long. | Type | Initial Range(miles) | How con- | tacted. | Remarks
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
21 | 0415-H | 28 Oct | 11-59.0N | 119-54.0E | Unk. | 9 | R. | -
22 | 1600-H | 28 Oct | 14-37.0N | 119-36.0E | Emilie | 3 | P | -
23 | 0955-H | 30 Oct | 16-12.0N | 119-45.0E | Pete | 4 | P | -
24 | 1115-H | 30 Oct | 16-12.0N | 119-45.0E | Rufe | 10 | P | -
25 | 1120-H | 30 Oct | 16-08.0N | 119-40.0E | Rufe | 8 | P | -
26 | 1550-H | 2 Nov | 15-55.0N | 119-45.0E | Emilie | 3 | P | -
27 | 1130-H | 4 Nov | 15-57.0N | 119-43.0E | 2 Nell | 1 Rufe | 4 | P | -
28 | 1527-H | 4 Nov | 15-55.0N | 119-41.0E | 3 Nell | 1 Rufe | 4 | P | -
29 | 0645-H | 5 Nov | 15-05.0N | 119-55.0E | 7 Nell | 5 | P | -
30 | 0700-H | 5 Nov | 15-05.0N | 119-55.0E | Zero | 5 | P | -
31 | 1108-H | 5 Nov | 15-05.0N | 119-50.0E | BiPlane | 5 | P | -
32 | 1452-H | 5 Nov | 14-57.0N | 119-44.0E | 3 Unk. | 6 | P | -
33 | 0645-H | 6 Nov | 15-55.0N | 119-43.0E | Nell | 5 | P | -
34 | 1040-H | 9 Nov | 08-16.0N | 120-16.0E | Unk. | 16 | R | -
35 | 1145-H | 9 Nov | 08-08.0N | 120-15.2E | Unk. | 17 | R | -
36 | 1908-H | 9 Nov | 05-58.0N | 119-47.0E | Unk. | 8 | R | -
37 | 1930-H | 9 Nov | 05-55.0N | 119-47.0E | Unk. | 5 | R | -

Type of submarine camouflage on this patrol: 32/3SS-B.

- 24 -
ENCLOSURE (A)

— page 117 —
CONFIDENTIAL
(H)
U.S.S. GUITARRO
TORPEDO ATTACK REPORT
Torpedo Attack No. 1 Patrol No. 3
Time 0735(H) Date 31 October 1944 Lat. 15-17.9N, Long. 119-49.9E.

Target Data - Damage Inflicted

Description:

Weather was rainy and all of formation not seen. Observed six
AKs in two columns with two PC type escorts ahead and three on the
seaward beam, other ships astern. There were also trailing escorts
which were not observed, but whose pinging could be heard. A TAMON
MARU (EC) type AK led the inshore column of two other large AKs in
open formation. Two AKs led another AK in the seaward col-
umn. The TAMON MARU was identified by its low sloping flush deck
and raised hatch covers, loading booms were rigged upright and not
as shown in ONI 208-J (revised).

Ship(s) Sunk:

TAMON MARU (EC), Estimated Tonnage, 8,200 Tons.
Large AK (EU), Estimated Tonnage, 7,500 Tons.
Large AK (EU), Estimated Tonnage, 7,500 Tons.

Ship(s) damaged or probably sunk:

None.

Damage determined by:

Observed and timed two hits in TAMON MARU and watched its am-
munition cargo blow up and destroy it.
Observed and timed two hits in large AK next in shoreward
column and observed its back break and commence sinking amidships
with bow and stern at sharp up angles on a "V".
Observed on hit and timed two hits in last AK of shoreward
column. The last hit was timed as we were going deep. This ship
was an ammunition ship and blew up with a tremendous explosion that
jarred the GUITARRO and knocked us down materially in depth.
Distinct breaking up noises heard on estimated sinking positions
of all three ships.

Target draft 26' Course 140°T Speed 8 kts. Range 2,820 yards.
Target draft Unk. Course 145°T Speed 8 kts. Range 1,220 yards.
Target draft Unk. Course 140°T Speed 8 kts. Range 2,640 yards.

- 25 -
ENCLOSURE (A)

— page 118 —
CONFIDENTIAL
(H)
TORPEDO ATTACK REPORT
U.S.S. GUITARRO Torpedo Attack No. 1 Patrol No. 3

Own Ship Data
Speed 2 kts. Course 320°T Depth 66' Angle 0°

Fire Control and Torpedo Data

This was a day periscope attack made on a cloudy choppy day,
ideal for this type attack. The GUITARRO obtained a firing position
dead ahead of the second ship in the seaward column on parallel and
opposite course. Four torpedoes aft were fired at the leading ship
shoreward and four forward at the second and third. The third ship
was not quite overlapping the second and just in the right position
to take the two that missed aft. Plan was to fire two remaining
torpedoes at ship dead ahead but he was too close to us.

- 26 - ENCLOSURE (A)

— page 119 —
CONFIDENTIAL

TORPEDO ATTACK No. 1

Tubes fired | #7 | #8 | #9 | #10 | #1 | #2 | #3 | #4
Track angle | 120°S | 121°S | 120°S | 121°S | 58°S | 59°S | 61°S | 61°S
Gyro angle | 61 L | 63½L | 68 L | 69 L | 58½R | 60 R | 65 R | 64½R
Depth set | 5' | 5' | 5' | 5' | 5' | 5' | 5' | 5'
Power | Elec. | Elec. | Elec. | Elec. | Elec. | Elec. | Elec. | Elec.
Hit or miss | Hit | Hit | Miss | Miss | Hit | Hit | Hit | Hit
Erratic | No | No | No | No | No | No | No | No
Mark torpedo | 18-1 | 18-1 | 18-1 | 18-1 | 18-1 | 18-1 | 18-1 | 18-1
Serial | 54321 | 55864 | 54459 | 56372 | 54984 | 56438 | 55782 | 55763
Mark exploder | 8-5 | 8-5 | 8-5 | 8-5 | 8-5 | 8-5 | 8-5 | 8-5
Serial | 8302 | 8061 | 8662 | 9667 | 7959 | 8376 | 9317 | 9643

Actuation set | Impact | Impact | Impact | Impact | Impact | Impact | Impact | Impact
Act. actual | Impact | Impact | -- | -- | Impact | Impact | Impact | Impact
Mark warhead | 18-2 | 18-2 | 18-2 | 18-2 | 18-2 | 18-2 | 18-2 | 18-2
Serial | 1688 | 1786 | 3461 | 3452 | 3229 | 3297 | 3512 | 3477
Explosive | Tpx. | Tpx. | Tpx. | Tpx. | Tpx. | Tpx. | Tpx. | Tpx.
Firing interval 8 seconds.
Type spread Divergent.
Sea conditions Choppy
Overhaul Activity Submarine Repair Unit Torpedo Shop,
                   Fremantle, West Australia.
Remarks            None.

- 27 -                                                              ENCLOSURE (A)

— page 120 —
CONFIDENTIAL
(H)
                                        TORPEDO ATTACK REPORT
U.S.S. GUITARRO                  Torpedo Attack No. 2                  Patrol No. 3
Time 1605(H) Date 4 November 1944 Lat. 16-03 N, Long.119-43.4 E.

                         <u>Target Data - Damage Inflicted</u>

Description:

     Large AP(EU) flanked on each side by two large landing craft
similar to our LCTs. One PC type observed on starboard quarter.

Ship(s) sunk:

     One large AP(EU), Estimated tonnage 10,000 tons.

Ship(s) damaged or probably sunk:

     None.

Damage determined by:

     Observed and timed one hit in ship's engine room, throwing up
a mass of smoke, steam and spray, starting a large fire and causing
him to sag down by the stern. His screws stopped and never started
again. One hour and fifty-four minutes later two muffled explo-
sions overhead were heard and he broke up and sank within a
thousand yards of GUITARRO which rocked as he went down. Breaking-
up noises and hissing steam lines sounded as though the ship was
coming down directly on us. Bits of metal struck GUITARRO's hull
fore and aft. All breaking-up noises were audible through the hull
much to the discomfort and worry of all hands.

Target draft 20'(aprox.) Course 196°T Speed 11 kts. Range 3,390.

                               <u>Own Ship Data</u>

Speed 2 kts. Depth 66' Course 166°T Angle 1° down.

                         <u>Fire Control and Torpedo Data</u>

     This was a day periscope attack made in a calm sea with planes
overhead. The electric torpedo again proved its worth as we had to
fire outside three thousand yards. The long range and wakeless
torpedo also saved us from heavy countermeasures from near escort
and allowed us to observe our inflicted damage.

                                  - 28 -                               ENCLOSURE (A)

— page 121 —
CONFIDENTIAL

                                                                TORPEDO ATTACK No. 2

Tubes fired                                     #1              #2              #3              #4
Track angle                                     81 S            81 S            82 S            81.5S
Gyro angle                                      68 L            69 L            65 L            65.5L
Depth set                                       6'              6'              6'              6'
Power                                           Electric        Electric        Electric        Electric
Hit or miss                                     Miss            Hit             Miss            Miss
Erratic                                         No              No              No              No
Mark torpedoes                                  18-1            18-1            18-1            18-1
Serial                                          54825           56494           55018           55838
Mark exploder                                   8-5             8-5             8-5             8-5
Serial                                          9603            9407            9706            9792
Actuation set                                   Impact          Impact          Impact          Impact
Actuation actual                                -               Impact          Impact          Impact
Mark warhead                                    18-2            18-2            18-2            18-2
Serial                                          1420            3336            3306            2452
Explosive                                       Tpx.            Tpx.            Tpx.            Tpx.

Firing interval                                 8 Seconds.

Type spread                                     Divergent.

Sea conditions                                  Calm.

Overhaul Activity                               Submarine Repair Unit Torpedo Shop
                                                Fremantle, West Australia.

Remarks                                         Torpedoes #54838 and #55018 exploded on the
                                                beach after a 5,200 yard run.

                                                - 29 -                                  ENCLOSURE (A)

— page 122 —
CONFIDENTIAL
(H)
U.S.S. GUITARRO                     TORPEDO ATTACK REPORT
                                    Torpedo Attack No. 3                     Patrol No. 3
Time 0718(H) Date 6 November 1944 Lat. 15-54.7N, Long. 119-44.8E.

                                    <u>Torpedo Data - Damage Inflicted</u>

Description:
          One ATAGO class heavy cruiser followed at 2,000 yards by
another CA ahead and inshore of an undetermined number of merchant
men. Many escorts of PC type surrounded the convoy. Four escort
vessels were visible from GUITARRO's attack position and others
heard. Four aircraft were making sub search circles ahead and over
the convoy.

Ship(s) sunk:
          None.

Ship(s) damaged or probably sunk:
          One ATAGO class CA 9,900 tons. (TC)

Damage determined by:
          Claimed three and possibly four hits in ATAGO heavy cruiser.
The concentration of nine torpedoes fired this was the min-
imum to expect. First hit should have been #1 & #8 torpedoes as
they were fired simultaneously as were #3 and #10 which hit one
second apart.

Target draft 18' Course 000°T Speed 12 kts. Range 4,500 yards.

                                    <u>Own Ship Data</u>
Speed 2 kts. Depth 66' Course 200°T Angle 0°.

                                    <u>Fire Control Data</u>
          This was a day periscope attack in a calm sea with swells,
with heavy escort and air coverage. A course was chosen so that
both bow and stern tubes would bear. From experience we have
found that Mk 18-1 torpedoes take their large gyro angles very
accurately. Both bow and stern tubes were fired simultaneously

                                    - 30 -                                 ENCLOSURE (A)

— page 123 —
CONFIDENTIAL
(H)
TORPEDO ATTACK REPORT
U.S.S. GUITARRO
Torpedo Attack No. 3
Patrol No.

thus putting the maximum concentration of torpedoes in the water in
minimum time. We should have obtained six hits but the range was
greater than judged and the spread was large enough to make the
second pair of torpedoes miss astern. Our electrics again proved
their worth allowing us to fire at extreme range without alerting
the target. One escort had picked us up just before firing and if
he had had wakes to come down, we could probably have gotten more
of the terrific working over that we got.

- 31 -
ENCLOSURE (A)

— page 124 —
CONFIDENTIAL

                                TORPEDO ATTACK No. 3

Tubes fired         #1    #2    #3    #4    #5    #6    #8    #9    #10
Track angle         55 P  57 P  56 P  57 P  59 P  60 P  55 P  57 P  56 P
Gyro angle          77 L  79 L  80 L  75 L  73 L  75 L  107R  105R  105R
Depth set           6'    8'    6'    8'    6'    8'    6'    8'    6'
Power               Elec. Elec. Elec. Elec. Elec. Elec. Elec. Elec. Elec.
Hit or miss         Hit   Miss  Hit   Miss  Miss  Miss  Poss. Miss  Hit
Erratic             No    No    No    No    No    No    No    No    No
Mark torpedo        18-1  18-1  18-1  18-1  18-1  18-1  18-1  18-1  18-1
Serial              54399 56461 56448 55817 56429 55788 55823 55834 54822
Mark exploder       8-5   8-5   8-5   8-5   8-5   8-5   8-5   8-5   8-5
Serial              9908  8249  8960  9320  8684  9674  9331  9908  9346
Actuation set       Impact Impct. Impct. Impct. Impct. Impct. Impct. Impct. Impct.
Act. actual         Impact --    Impact --    --    --    Impact Impact --
Mark warhead        18-2  18-2  18-2  18-2  18-2  18-2  18-2  18-2  18-2
Serial              3515  3043  3432  3524  3372  3431  3449  3440  3435
Explosive           Tpx.  Tpx.  Tpx.  Tpx.  Tpx.  Tpx.  Tpx.  Tpx.  Tpx.

Firing interval 8 Seconds.

Type spread         divergent.

Sea conditions      Glassy.

Overhaul activity:  Submarine Repair Unit Torpedo Shop,
                    Fremantle, West Australia.

Remarks: #1 and #8, #2 and #9, #3 and #10 tubes were fired simultan-
         eously. The torpedo for #7 tube had been flooded and over-
         haul was not quite complete at time of attack.

- 32 -                                                ENCLOSURE (A)

— page 125 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

(I) MINES.
On the night of 22 October a series of floating mines were
observed close aboard off the southwest tip of MINDORO. GUITARRO
was forced to dive to go under them. It is believed these mines
were used in conjunction with the Jap task force movements through
the strait on the night of 23 - 24 October.

(J) ANTI-SUBMARINE MEASURES AND EVASION TACTICS.
By the use of large gyro angles - which electric torpedoes
take well - this ship attempted to be other than at the expected
place at time of attack by escorts - namely not on the beam.

Density layers were of considerable help in running silently.

(K) MAJOR DEFECTS. (C. & R.)

Steering

Hand steering practically refused to function at deep sub-
mergence; believed due to: (a) Hull distortion, causing greater force
to be required to move rudder and (b) "Equalizer" line (which was
placed across power pump outlets to eliminate creep) which bypasses
the small output of the hand pump.

Periscopes

Both periscopes are very dirty inside and the stadimeters of
both periscopes were jarred out of adjustment by explosions.

Extensive overhaul to optical parts is indicated.

Stern Planes

Stern planes are excessively noisy both in power and in hand
due to probable misalignment after several close heavy explosions.
Thorough overhaul and removal of noise is necessary.

ENGINEERING) I.C.F.C. Panel

On 10 October smoke was detected coming from the I.C.F.C.
panel in the pump room. Inspection revealed that both #1 and #2
supply switches had burned out, and the bakelite backboard was
charred. Cause: bolts from bus to switches too small to carry

- 33 - ENCLOSURE (A)

— page 126 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

load causing excess temperature and resultant failure. Remedy:
The switches and backboard were removed and #1 and #2 I.C. panels
were hooked directly to the bus - by-passing the switches. It is
recommended that the bolts from the type S62-1, 60 amp. tumbler
switches to the buss be enlarged to carry the load. Normal load
is 45 amps.

Kleinschmidt Evaporators

On 19 October the water produced by the Kleinschmidts tested
unsuitable for battery use. #2 was determined to be the offender.
The unit was dismantled and pressure tested. The coils tested
sound, so the scale was removed from the upper shell and the unit
tested satisfactory for battery use for ten days, and then once
again showed a positive Silver Nitrate test. For the balance of
the patrol all battery water was made by #1 unit. These coils
have had three acid flushings without renewal, and it is recommended
that both units be completely overhauled this refit.

Pit Log

On 31 October during Attack #1, the explosion of the ammuni-
tion skip close by occurred before the pit log could be rigged in.
The sword connections were blown off spraying salt water on the
QC-JK training MG set and the JP-1 sound equipment. The pit log
bellows was damaged beyond repair and was replaced. The equipment
salted was washed and dried and is operating satisfact-
orily. Following this explosion the rotary distance transmitter
functioned erratically and it is recommended that the entire unit
be carefully overhauled this refit.

Master Gyro Compass

The master compass became noisy following attack #1. The
noise seems to emanate from the follow-up gear train, but no troubl
developed as yet. This should be checked this refit for pos-
sible misalignment.

The heavy countermeasures following attack #3 smashed the
bridge gyro repeater. The pressure-proof binnacle was ruptured
and the glass shattered, flooding the repeater and cable. The
repeater was removed from the bridge and the cable taped to prevent
further damage. Every effort is being made to salvage the selsyns.

- 34 - ENCLOSURE (A)

— page 127 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

Reduction Gear

On the night of 31 October following attack #1 in which a
large ammunition ship blew up causing severe shock to the USS GUITARRO,
a noise was detected in the port reduction gear. This noise was
just audible to the ear at speeds below standard. The Engineering
Officer at this time checked the port reduction gear with stetho-
scope, and while the noise was audible it was impossible to deter-
mine the exact source. It was decided at this time to maintain a
constant vigil over this reduction gear paying special attention to
lubrication and bearing temperatures. The following week of obser-
vation gave us nothing in the way of a clue, and the noise seemed
to decrease somewhat in intensity. Up through 6 November the temp-
eratures were all normal, and the starboard main and pinion bearings
were consistently a few degrees higher than the port.

On the 6th of November the severe depth charging following
our attack on a heavy cruiser once again caused heavy shock to the
GUITARRO. Upon surfacing the night of the 6th, the noise in the
port reduction gear was about the same intensity as previously
noted on 31 October. It was still impossible to determine the
source, but the steady clicking seemed to match the pinion speed
closer than shaft speed. Following this attack the port inboard
pinion bearing aft commenced running a little hotter. The noise
was still not audible at high speeds due to excess background noise.

On 14 November, while running at 75 - 90 combination on four
engines, the noise first became audible to the ear, and was accom-
panied by some vibration in the deck plates. The port after pin-
ion bearing had by this time risen to about five degrees higher
than the starboard, but the temperature of 145°F. was not abnormal
for 245 shaft R.P.M's.
The fact that from commissioning up until the 6th of November
#2 main motor after pinion bearing ran about 3 degrees cooler than
#3 motor bearing, whereas now #2 is running about 5 degrees hotter
than #3, would indicate that whatever condition existed on 31
October was aggravated on 6 November. It is believed that the
trouble may be due to possible misalignment resulting from severe
external shock.
Constant vigilance was maintained on the return to base with
the idea in mind that if the condition of noise and vibration
coupled with higher bearing temperature should show any signs of
further aggravation, the port shaft would be secured and return
completed on one shaft.

Indications are that trouble is located in #2 main motor pinion
gear. Reduction gear should be disassembled and trouble investi-
gated and corrected prior to another patrol.
- 35 -
ENCLOSURE (A)

— page 128 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

(L) RADIO.
All radio equipment functioned satisfactorily.

(M) RADAR.
Both radars were knocked out by the severe depth charging on
6 November. By excellent work on the part of NEWTON, M, RT2c,
655-33-70, USNR and KINRAITH, F.C., CRM(AA), 337-10-16, USN., the
SJ was back in shape by dark but it took three days to repair the
SD.

(N) SOUND.
Sound conditions were the best for submarines yet experienced
in this area. JP consistently picked up screws at 25,000 yards.
Density layers materially assisted escape tactics. All sound
gear functioned well.

(O) DENSITY LAYERS.

| Time & Date | Lat. & Long. | Surface Temp. | Remarks |
|---|---|---|---|
| 2121-H | 10-28N | 82° | Isothermal to 120'. Gradual decline of 1° |
| 21 Oct | 121-42E | | 120'-160'. Moderate decline of 1° from |
| | | | 160'-175'. Gradual decline of 1° from 175' |
| | | | - 260'. |
| 2000-H | 12-50N | 82° | Isothermal to 150'. Very sharp decline of |
| 23 Oct | 119-30E | | 4° between 150'-170'. Continued decline of |
| | | | 6° between 170'-285'. |
| 1600-H | 16-00N | 84° | Gradual decline of 1° to 160'. Sharp de- |
| 30 Oct | 120-00E | | cline of 2° between 160'-180'. |
| 0912-H | 15-10N | 84° | Isoballast to 340'. |
| 31 Oct | 119-52E | | |
| 1700-H | 15-55N | 83° | Isothermal to 140'. Moderate decline of 1° |
| 4 Nov | 119-40E | | between 140'-200'. Sharp decline of 7° be- |
| | | | tween 200'-310'. |
| 0600-H | 15-56N | 83° | Moderate decline of 3° between periscope |
| 6 Nov | 119-40E | | depth and 250'. Sharp decline of 6° between |
| | | | 250'-320'. |

The above density layers were considered worthy of note as
indicating prevalent conditions in the localities concerned.

Note: 2,000# S.B.T. card. All depths indicated are SBT blister
depths.

- 36 - ENCLOSURE (A)

— page 129 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Third War Patrol.

(P) HEALTH, FOOD AND HABITABILITY.

Health in general was average. Between FREMANTLE and area
many severe colds were noted. One death occurred on board.
CRANSTON, Richard L, EM2c, 250-73-58, USN., was turned in on 12
October with Catarrhal fever. He apparently responded to treatment,
but suddenly developed pneumonia on the next day and died on the
afternoon of 14 October. One case of appendicitis developed two
days prior to return to base but was neutralized with penicillin.

Food and habitability were average.

(Q) PERSONNEL.

Both officers and men performed their duties in a highly sat-
isfactory manner, in accordance with the best traditions of the
naval service.

Number of men on board during patrol74
Number of men qualified at start of patrol- - - - - 56
Number of men qualified during patrol- - - - - - - 5
Number of unqualified men making their first patrol - 16

(R) MILES STEAMED - FUEL USED.

FREMANTLE to area 3,547 miles 36,680 gals.
In area 2,135 miles 17,964 gals.
Area to FREMANTLE 3,000 miles 43,253 gals.

(S) DURATION.

Days enroute to area 17
Days in area 14
Days enroute to base 9
Days submerged 23

(T) FACTORS OF ENDURANCE REMAINING.

Torpedoes | Fuel | Provisions | Personnel
2 | 27,000 gals. | 30 days | 30 days

Limiting factor this patrol - Patrol terminated by orders,
due to expenditure of torpedoes.

- 37 - ENCLOSURE (A)

— page 130 —
CONFIDENTIAL

U.S.S. GUITARRO, Report of Third War Patrol.

(U) RADIO AND RADAR COUNTERMEASURES.

     The only information ascertained on enemy radar was APR indi-
cations on the frequencies given:

                                                              Megacycles
     (a) By task force on 23 October

— page 131 —
CONFIDENTIAL
U.S.S. CUITATRO, Report of Third War Patrol.

     In one attack nine torpedoes were fired - one stern torpedo
had been flooded and repairs were not quite completed - at an enemy
heavy cruiser. It is believed four hit, that #1 and #6 hit simul-
taneously, but since only three explosions were recorded only three
hits are claimed. Immediate, intensive and accurate countermeasures
were taken due to having been detected by sound prior to firing.
Range was underestimated by 500 yards, only one opportunity to fire
was available, yet it is believed maximum damage to the enemy was
inflicted by the use of simultaneous firing.

                         Mark 18-1 Torpedoes.

     This makes the third full load of Mark 18-1 torpedoes carried
by this boat. We have fired fifty-two war shots for twenty-nine
hits (includes two probable). This results in a hit percentage of
55.8%.

     All torpedoes received this patrol were in excellent condition
and maintained the high performance record we have come to expect
from them. All but one target fired at necessitated a torpedo run
of more than 2,000 yards and three of the targets a torpedo run of
greater than 3,000 yards.

     One torpedo suffered a flooded afterbody due to a split gasket
on #7 handhold. This torpedo was disassembled, the motor and field
coils soaked in fresh water for 16 hours, and then baked dry, re-
taped and varnished. All leads were renewed and a special charg-
ing connection of original design was used to replace the ruined
one. The battery was washed down with fresh water and soda solu-
tion. Fifty hours later the torpedo was back in commission with a
full charge in the battery, no grounds, and a nine megohm reading
on the armature.

     Another torpedo developed a short circuit across the securing
stud and negative terminal of the charging plug. Cause of the
short circuit is still undetermined as no foreign material was
found in the afterbody. The negative terminal and securing studs
melted and allowed the charging connection to drop against the
torpedo, causing a dead short circuit across the battery and
burning a hole in the torpedo. The torpedo was flooded for an
attack prior to discovery of the damage. The afterbody completely
flooded and the battery compartment flooded approximately 1/3 of
the way up the battery.

                                  - 39 -                         ENCLOSURE(A)

— page 132 —
CONFIDENTIAL
U.S.S. CUITADRO, Report of Third War Patrol.

The torpedo was useless as the two inch hole in the shell
could not be repaired. The torpedo was disassembled and all parts
were cleaned and saved, the battery grounds were cleared and a
A twenty hour low amperage charge was necessary
as the battery was badly sulphated. The battery now shows no
grounds and maintains a high specific gravity.
[UNCLEAR: faint stamp]

- 40 - ENCLOSURE (A)

— page 133 —
SUBMARINE SQUADRON TWELVE
gh
F05-12/A16-3/F35-121
Serial #

Care of Fleet Post Office
San Francisco, California
24 November 1944

From: The Commander Submarine Squadron TWELVE.
To: The Commander in Chief, United States Fleet.
Via: (1) The Commander Submarines, SEVENTH FLEET.
     (2) The Commander SEVENTH FLEET.

Subject: U.S.S. GUITARRO (SS363) - Report of Third War Patrol.

1. The third war patrol of GUITARRO was conducted in the
South China Sea and adjacent to the Luzon West Coast. Its duration
was forty days with twenty-nine days north of the Malay Barrier.

2. After several contacts which could not be developed into
attacks GUITARRO was finally rewarded with the opportunity to
execute a most brilliant and successful attack upon a
heavily escorted convoy. Eight torpedoes were fired from bow and
stern tubes which resulted in six hits and disposed of three AKs.

3. In the second attack on 4 November four torpedoes were
fired at a large AP at range of 3,390 yards to produce one hit for a
successful attack.

4. On 6 November an attack with nine torpedoes was made upon
what appeared to be a CA which resulted in three timed hits. This
attack was noteworthy from the standpoint of volume of fire.

5. The death of CRANSTON, Richard L., 250-73-50, EM2c, USN,
is deeply regretted.

6. Because of a complete four engine overhaul on last refit,
1 September 1944 to 22 September 1944, and the short patrol, it will
only be operated under light load conditions. All were found in good
condition. stern plane diving gears showed signs of having been
with low oil level in case and will require much honing.
required unit may show an increase in the noise because of ex-
cessive wear on these gears. The timing motor on the TDC will be
for proper operation. Due to heavy depth charging, the
steering gear of this boat requires close checking and repair; this
in forward battery well developed a leak by cracking a welded seam,
which will be welded with CRS rod.

7. The Squadron Commander extends his hearty congratulations
to the Commanding Officer, officers and crew for the heavy and im-
portant damage inflicted upon the enemy.

[SIGNATURE: C. W. Wilkins]
C. W. WILKINS

— page 134 —
FE24-71/A16-3
Serial 01496
C-O-N-F-I-D-E-N-T-I-A-L

UNITED STATES NAVY
12a/ar
8 December 1944.

SECOND ENDORSEMENT to:
USS GUITARRO Conf. Ltr. A16-3
Serial 044, dated 16 November,
1944. Report of Third War
Patrol.

From: The Commander Submarines, SEVENTH FLEET.
To: The Commander in Chief, UNITED STATES FLEET.
Via: The Commander, SEVENTH FLEET.

Subject: U.S.S. GUITARRO (SS363) - Report of Third War
Patrol - Comment on.

1. GUITARRO's Third War Patrol was conducted off the
west coast of LUZON in a coordinated attack group consisting of
RATON, GUITARRO and BREAM, under the tactical command of BREAM's
Commanding Officer.

2. GUITARRO had another extremely active, interesting
and successful patrol. Two convoys, one large Task Force and
several important men-of-war were sighted before an attack could
be made. The first attack made up for the previous disappointment,
however. Eight torpedoes were divided between three large AKs
in a beautifully executed attack for six hits which sank all three
targets.

3. On the second attack one hit from four torpedoes
sank a large AP which had been damaged by one hit from BREAM eleven
minutes earlier. The credit for this sinking is divided equally
between BREAM and GUITARRO.

4. The third attack was on the larger of two CAs ac-
companying a large convoy northbound out of MANILA. Three stern
torpedoes were fired coincidentally with the entire bow nest in
six seconds. Three hits were made from the nine torpedoes.
The Commanding Officer has since identified this heavy cruiser as
a MOGAMI type. Within the next two and one half hours the two
cruisers in this convoy were attacked by three other submarines.
RATON both attacked the two cruisers and RAY and RATON both
attacked the MOGAMI type. The details of the latter two attacks
are not yet known, but it is believed that RAY made two hits
which blew off the bow. In spite of all this damage the cruiser
remained afloat and was last seen by RAY being towed south. This
is believed to be the cruiser that was subsequently sighted off
SANTA CRUZ, and finally sunk there by our planes. GUITARRO is
tentatively being given credit for damaging one half CA MOGAMI type.

- 1 -

— page 135 —
```
FE24-71/A16-3
Serial 01496
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to:
COMSUBPAC Conf. ltr. A16-3
Serial 044, dated 16 November,
1944. Report of Third War
Patrol.

Subject: U.S.S. GUITARRO (SS363) - Report of Third War
Patrol - Comment on.

— page 137 —
ในบทนี้ เราจะมาดูวิธีการสร้างและใช้งานฟังก์ชันในภาษา Python กัน

ฟังก์ชันคืออะไร?
ฟังก์ชันคือกลุ่มของคำสั่งที่ถูกรวมเข้าด้วยกันเพื่อทำงานเฉพาะอย่างใดอย่างหนึ่ง การใช้ฟังก์ชันช่วยให้โค้ดของเราเป็นระเบียบ อ่านง่าย และสามารถนำกลับมาใช้ใหม่ได้ (reusability)

โครงสร้างของฟังก์ชัน
ใน Python เราใช้คีย์เวิร์ด `def` เพื่อประกาศฟังก์ชัน ตามด้วยชื่อฟังก์ชัน วงเล็บ `()` และโคลอน `:`

```python
def ชื่อฟังก์ชัน():
    # บล็อกคำสั่งของฟังก์ชัน
    print("นี่คือภายในฟังก์ชัน")
```

ตัวอย่าง: ฟังก์ชันง่ายๆ ที่ไม่มีพารามิเตอร์และไม่มีค่าคืนกลับ

```python
def greet():
    print("สวัสดีครับ/ค่ะ!")
    print("ยินดีต้อนรับสู่โลกของฟังก์ชัน Python")

# เรียกใช้งานฟังก์ชัน
greet()
```

ผลลัพธ์:
```
สวัสดีครับ/ค่ะ!
ยินดีต้อนรับสู่โลกของฟังก์ชัน Python
```

พารามิเตอร์ของฟังก์ชัน
ฟังก์ชันสามารถรับข้อมูลจากภายนอกได้ ข้อมูลเหล่านี้เรียกว่า "พารามิเตอร์" (parameters) หรือ "อาร์กิวเมนต์" (arguments) เราสามารถกำหนดพารามิเตอร์ในวงเล็บหลังชื่อฟังก์ชัน

```python
def greet_name(name):
    print(f"สวัสดีครับ/ค่ะ, {name}!")
    print("

— page 138 —
[STAMP: U. S. No.
1 0516]
27 DEC 1944

UNITED STATES FLEET
COMMANDER SEVENTH FLEET

A16-3(F-3-4/vmw)
Serial: 7076

[STAMP: CONFIDENTIAL]
THIRD ENDORSEMENT to:
USS GUITARRO (SS363) conf. ltr.,
Ser. 044 dated 16 Nov. 1944.

From: Commander SEVENTH Fleet.
To : Commander in Chief, United States Fleet.

Subject: U.S.S. GUITARRO (SS363) - Report of Third War
 Patrol - Comment on.

1. Forwarded.

2. Subject report covers the Third War Patrol of GUITARRO,
which was conducted in the South China Sea off the west coast
of Luzon. The results are considered an outstanding achievement and a material
contribution to the subsequent defeat of the Japanese Forces.

3. On the night of 23-24 October 1944 the GUITARRO
sighted a large force of enemy combatant ships - units of the Japanese
Central Force which later passed through San Bernardino Strait. The
GUITARRO was unable to make a surface attack because of enemy radar
and high speed. Although the enemy had the GUITARRO on radar, the
submarine avoided the investigating ships and made contact reports
on the composition, location, speed and course of the Japanese Force.
These reports, in conjunction with those of other submarines, enabled
the planes of our fast carriers to make successful attacks on this
force on 24 October.

4. The GUITARRO has been credited with 28,200 tons sunk
and 7,000 tons damaged on the patrol covered by subject report. It is
understood that, in view of the heavy damage inflicted by the GUITARRO
and RAY on the CA (MOGAMI Class), a recommendation is being made to
ComSubSeventh Fleet that each of the above submarines be given credit
for 1/3 sinking of such cruiser, instead of 1/2 damage. The GUITARRO's
attack was made after being discovered by the cruiser's escorts, and re-
sulted in heavy depth charge attacks by the escorts, inflicting sub-
stantial damage on GUITARRO.

5. All attacks by the GUITARRO were daylight submerged
attacks and were skillfully and aggressively directed by the Commanding
Officer.

6. The GUITARRO's Commanding Officer, Officers and crew
are congratulated on an extremely successful patrol.

Copies to:
ComSubRon-12
ComSubS7thFlt
CO USS GUITARRO

[SIGNATURE: C. E. Van Hook]
C. E. VAN HOOK,
Deputy.

[STAMP: 1 0516]

— page 139 —
[HANDWRITTEN: 1ST copy]

SS363/A16-3
Serial 01

DECLASSIFIED [HANDWRITTEN: A-L]

U.S.S. GUITARRO (SS363)

Care of Fleet Post Office,
San Francisco, California.
15 March 1945.

From: The Commanding Officer.
To : The Commander-in-Chief, United States Fleet.
Via : [UNCLEAR: Officer in Charge]
Subject: USS GUITARRO - Report of War Patrol Number FOUR.
Enclosure: (A) Report of War Patrol, 1st Phase.
(B) Transmittal for 2nd Phase ((Conf. U. only)).
(C) Report of 4th War Patrol, 2nd Phase.
(D) Transmittal for 2nd Phase ((Conf. U. only)).

1. Enclosures (A) through (D), covering the fourth war
patrol of this vessel conducted along the Indo China Coast areas
during the period 11 December 1944 to 15 March 1945, are forwarded
herewith.

[SIGNATURE: T.B. Dabney]
T.B. DABNEY.

DECLASSIFIED ART. 0445, OPNAVINST 5510.1C
[HANDWRITTEN: BY OP-09D2 DATE 5/30/22]

DECLASSIFIED

[STAMP: 114381 FILMED]
[STAMP: 16 APR]

— page 140 —
CONFIDENTIAL

U.S.S. GUITARRO, Report of Fourth War Patrol.

(.) PROLOGUE.

Arrived FREMANTLE, WESTERN AUSTRALIA, from third war
patrol on 16 November 1944 and commenced refit by Submarine
Repair Unit, Navy 137. During this period attempts were made to
locate and eliminate a clicking noise in the port reduction gear
which developed during the third war patrol. The noise was not
eliminated nor was the cause determined. (See separate report under
engineering casualties). Correction of the noise/vibration
of the stern planes was also attempted but due to the lack of
parts this defect could not be corrected.

2 December 1944. Commander E. D.W. HASKINS, USN, was relieved
as Commanding Officer by Commander T. B. DABNEY, USN. The follow-
ing changes in officer personnel took place during this refit.

HASKINS, Eugene D'Hamal, Comdr., USN.
Reported - 26 January 1944.
Detached - 3 December 1944.

BLACK, Robert Glenwood, Lieut., D3-V(G), USNR.
Reported - 24 September 1944.
Detached - 3 December 1944.

BLOMINGER, Milton Lee, Ensign, USN.
Reported - 25 January 1944

— page 141 —
U.S.S. CHUTTAPRO Report of Fourth War Patrol.
(E) PRELIMINARY.

11 December 1944.

1315(H) Underway from FREMANTLE, WESTERN AUSTRALIA, for EXMOUTH GULF,
in accordance with COMMANDER TASK FORCE SEVENTY-ONE
order. Met escort off ROTTNEST ISLAND and conducted training
approaches and at
2030(H) Released escort and set course for EXMOUTH GULF in company with
USS CHARR.

12 - 13 December 1944.

Enroute FREMANTLE to EXMOUTH GULF, WESTERN AUSTRALIA.
Conducted training dives, drills and radar tracking with BURNARD
enroute. Conducted three hour full power run to determine if port
reduction gear was satisfactory. Reduction gear temperature
satisfactory but noise is still present and increasing slightly.

14 December 1944.

0700(H) Sighted VLAING HEAD 11 miles.
0750(H) Moored port side to BURNARD alongside USS Y-10 at EXMOUTH GULF.
0945(H) Underway from alongside BURNARD enroute to Patrol Area.

15 - 16 December 1944.

Underway EXMOUTH GULF to patrol Area via LOMBOK STRAIT conduct-
ing training exercises and dives.

17 December 1944.

0022(H) Sighted submarine and identified silhouette as friendly, bearing
040° T. range 15,000 yards. Was just about to challenge when at
0026(H) SD radar plane contact 10 miles closing, fast so at
0027(H) both of us made quick dive. Contact with Sub was never regained.
0103(H) Surfaced.
0112(H) SD radar plane contact at 12 miles closing, fast so made another
quick dive.
0207(H) Surfaced.
2215(H) Commenced transit of LOMBOK STRAIT. All quiet until
2246(H) SJ radar contact bearing 342° T. range 11,750 yards. Appeared
to be a small surface craft. Tracked with T.D.C. and found him
circling on station at from 8-12 knots. Successfully evaded on
surface.
2340(H) SJ radar contact on friendly submarine bearing 306° T. range
14,300 yards.

- 2 -
ENCLOSURE (A)

— page 142 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Fourth War Patrol.

13 December 1944

0027(H) Completed transit of LOMBOK STRAIT.
1141(H) SD radar plane contact at 8 miles closing fast so made a quick dive.
1244(H) Surfaced and sighted plane dead ahead, range 6 miles. No SD radar
indications. Dived. Decided to remain submerged for at least two
hours. Weather was very squally and visibility decreasing so at
1441(H) Surfaced.

19 December 1944

0304(H) Dived. Decided to remain submerged during daylight for the remainder
of the transit of the JAVA SEA.
1010(H) JP sound gear picked up screws bearing 050° T. After several looks
with screws getting louder at
1050(H) Finally located a small patrol boat of "PC" design at about 6000 yards
on parallel course. Boat was camouflaged in zebra fashion with black
and green stripes. PC disappeared to west.
1831(H) Surfaced.

20 December 1944

0835(H) Submerged. Master Gyro tumbled. Rotor out of balance (See
casualty report).
1832(H) Surfaced.

21 December 1944

0557(H) Submerged. Using Auxiliary Gyro.
1919(H) Surfaced.

22 December 1944

0330(H) SJ radar contact. Exchanged recognition signals with USS FLOUNDER
1521(H) Submerged. Using Auxiliary Gyro.
1551(H) Surfaced. Commenced transit of KARIMATA STRAIT.
2038(H) Received message changing our area to G-4 with U.S.S. GUITARRO,
2129(H) SJ radar contact. Exchanged recognition signals with USS PAMPANITO.
2400(H) Completed transit of KARIMATA STRAIT.

23 December 1944

0855(H) Sighted sailboat over the horizon on starboard beam by high periscope.
1008(H) Sighted masts dead ahead over the horizon. Bearing was steady and
masts getting closer so submerged. Identified masts to be those of
a small 75' sailboat. Remained submerged to avoid detection.

- 3 -
ENCLOSURE (A)

— page 143 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Fourth War Patrol.

23 December 1944

1805 (K) Surfaced.
1835 (K) SD radar contact 14 miles. Submerged. Fire Control Drill.
1850 (K) Surfaced. Master gyro back in commission.

24 December 1944

0820 (K) Commenced transit of Channel between GREATER NOEINA and SOEBI
ISLANDS.
1117 (K) Completed transit.
1700 (K) Fire Control Drill.

25 December 1944

0849 (K) Trim dive.
0920 (K) Deep dive.
1009 (K) Surfaced.
1600 (K) Held Divine Services. Master Hayes conducting service.
1900 (K) Observed Christmas Day with an excellent meal prepared by the
Commissary Department.

26 December 1944

0100 (K) Entered Patrol Area C-4.
0135 (K) SJ radar interference.
0150 (K) Exchanged recognition signals with GURNARD. GURNARD assigned
us a patrol station south of Lat. 11-48N, off entrance to CAMRANH
BAY. With heavy overcast unable to obtain a good fix but navi-
gator managed to take a noon sight and combined with a long contact
on radar we established a fairly decent position.
0300 (K) Rough seas, rain squalls, and heavy overcast. Made quick dive
to 100 feet. Decided to remain submerged for several hours in
case "Nips" had been able to "DR" our radio transmissions.
1030 (K) Surfaced with CAMRANH BAY about 50 miles on port beam.
1307 (K) Closed beach to 15 miles and dived taking periscope observations
every half hour. Heavy seas made depth control impossible. Unable
to see the beach because of poor visibility.
1834 (K) Surfaced. Discovered we have a current of almost four knots in
a southwesterly direction, setting us towards the beach.
2020 (K) Received message informing us GURNARD was endeavoring to contact us.

27 December 1944

0621 (K) Made a quick dive. Heavy seas wind of about 30-40 knots. Went to
100 feet. Taking a look every half hour from 60 feet. Depth control
difficult. Visibility poor, unable to see beach. Considered patrol
on surface but decided this not desirable in view of the
difficulty.

- 4 - ENCLOSURE (A)

— page 144 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Fourth War Patrol

27 December 1944.

0621(H) in submerging in heavy seas and the possibility of air patrols and
beach radar.
1330(H) Surfaced.

28 December 1944.

0108(H) Radar contact with GUILARD.
0600(H) Dived off entrance to Bay. Commenced submerged patrol. There seems
to be no way to stay off entrance to CAIRANH Bay with a 4 knot
current. You just get a look as you go by and that's all.
0833(H) Aircraft sighted (JAKE).
0840(H) Aircraft sighted (JAKE).
1300(H) Heavy underwater explosions, either depth charges or bombs.
1505(H) "DR" sound gear reports light fast screws bearing 080° T. Rain
squall in that direction. Visibility 5,000 yards. Nothing in sight.
1600(H) Sighted dim outline of ship in direction of rain squall. Visibility
5000 yards. On course 350° T. Bearing of target 060° T., range
estimated at 5000 yards. Battle stations submerged. Angle on the
bow appears to be zero.
1605(H) Made out ship to be DD. Unable to get a good range because of poor
visibility. Angle on the bow now 90° P. Estimated range 4000 yards.
Bearing 075° T.
1609(H) Change course 050° T. Range still about 4000 yards angle on bow
90° P. DD seems to be making a sweep around to the north, estimat-
ed speed 12 knots.
1610(H) JP picked up screws bearing 130° T. Commenced swinging right to
130° T, making ready all tubes. Sighted dim outline of a second
ship which was a large man-of-war. Rain had him almost
obscured. Estimated range 5000 yards. Unable to determine angle
on bow. On the same periscope exposure picked up the outline of a
third ship which was definitely a DD, bearing 120° T., range est-
imated at 5000 yards.
1620(H) Next look showed the large ship with a 20° Port angle on bow, range
closing rapidly. TDC had twenty knots cranked in but no solution.
1621(H) Angle on bow now 80° port on large ship; range read 1600 yards but
later developments indicate that the range must have been about
400 yards. Target looked to be either a KONGO Class BB or NACHI
Class CA and covered almost entire field of periscope. Commenced
swinging to left, changing course to 120° T, standing by to shoot
when tubes were ready.
1622(H) Torpedo tubes reported ready, but target had zigged toward and pass-
ed down port side very close aboard at a range which I later judged
to be 200 yards. When I picked up the target, the bearing was 197°
relative with 150° port angle on the bow, range 1600 yards. One
explosion not close. Target zigging radically. Had not seen any
planes but when five more bombs fell in quick succession at
1623(H) went deep. Target increasing speed by sound. Other screws but no
depth charges.

It was unfortunate and disappointing situation. With the GUITARRO
directly on the BB's track the only chance was to shoot when BB was
first sighted. His speed must have been 25 knots or greater. The
entire contact from the time sound first picked up the BB's screws
until the bombs fell lasted only 3 minutes.
- 5 - ENCLOSURE (A)

— page 145 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Fourth War Patrol.

28 December 1944.

1711 (H) Screw contacts and pinging faded out.
1749 (H) Periscope depth. Secured from Silent running and Battle Stations.
1816 (H) Surfaced.
2015 (H) Rendezvous with GURNARD. Assigned patrol station North of
     Lat. 11-48.
2015 (H) Discovered #7 H.P.T. vent would not close by hand or hydraulic.
     Endeavored to outer superstructure aft to discover trouble but
     because of high seas was forced to abandon this idea. After room
     reported something loose in superstructure as we went deep
     after aerial bombs fell.
2115 (H) After constant working of #7 H.P.T. lever in power the obstruction
     what ever it was, came loose and the vent closed normally there
     I was glad that the vent had frozen in the open position and not
     the closed position. Diving under these conditions would have
     exciting.

29 December 1944

0223 (H) SD plane contact at 9 miles. The ocean was as bright as day from
     a full moon so decided to dive and remain submerged for the remainder
     of the day.
0700 (H) Sighted small escort vessel bearing 089° T. Range 3000 yards.
     Angle on bow zero. Went to 150 feet and rigged for silent running.
     The screws and pinging of two additional small vessels were heard
     on either beam as we leveled off. I do not know what their presence
     meant but presumed that the Japs had decided to make a careful
     search as a result of yesterday's contact. Alternate pinging and
     light screws milling around in vicinity.
0810 (H) Screws and pinging faded out in direction of beach.
0900 (H) Periscope depth. All clear.
1910 (H) Surfaced. Bright moonlight. Opened out from land to avoid being
     silhouetted against moon by possible off shore patrol boats.
2032 (H) SD radar contact on what appeared to be a small patrol boat. Range
     11,000 yards. Avoided. He appeared to be on course North, parallel
     to beach and about 10 miles off-shore, making 8-10 knots.

30 December 1944

0551 (H) Dived.
1918 (H) Surfaced. Opened out from beach. Bright moonlight.
2309 (H) Rendezvous with GURNARD.

- 6 - ENCLOSURE (A)

— page 146 —
CONFIDENTIAL
USS GUITARRO, Report of Fourth War Patrol.

31 December 1944.

0600(H) Dived.
1230(P) Underwater explosion.
1510(H) Numerous underwater explosions, nothing in sight.
1920(P) Surfaced.
2000(P) Rendezvous with GUDGEON.

1 January 1945.

0607(H) Dived.
1232(H) Surfaced.
1241(H) Rendezvous with GUDGEON.

2 January 1945.

0540(P) Dived.
0805(P) Sighted small sailboat in close to beach.
1045(P) Heard many underwater explosions. Nothing in sight.
1100(P) Surfaced.
1115(P) Rendezvous with GUDGEON.

3 January 1945.

0547(H) Radar contact 1,000 yards bearing 262° T. This fellow came out
from behind a small island close in shore. COG finally made out
a structure of what appeared to be a large P.C. boat. Track-
ed target heading for us on 090° T. at 10 knots, so our
Dawn was breaking, and in order to avoid being sighted, we
0605(P) Dived. Periscope observations at daylight revealed nothing.
0815(H) Heard distant underwater explosions.
1040(H) More explosions.
1100(H) Stern planes jammed on 25° rise. The twin motor operating
on "no load". The boat took 15° up an angle and promptly went to
150 feet. Heavy underwater explosions. The bow was much while
frantically. For a few minutes which seemed an eternity, we
momentarily expected anything from aerial bombs to shell.
with the aid of negative tank, flooding of auxiliaries, and the
stopping of the screws we slowly settled to 150 feet. All hands
were ordered forward to remove the up angle. This helped some.
Everytime we went ahead two thirds to keep from going deeper the
boat took a large up angle. After much trimming and very
gradual changes of speed we were able to get a decent
50 rpm. Bow planes had very little effect, changing the bubble
no more than two or three degrees due to full rise position of the
stern planes. We were unable to take any periscope observations
due to swells and varying density of the water near the surface.

- 7 -
ENCLOSURE (A)

— page 147 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Fourth War Patrol.

3 January 1945

1100 (H) All hands were ordered to take comfortable stations and refrain from
moving about which would affect the trim of the boat. Lt. Bernard,
the First Lieutenant and Mr. Kerr, the Engineer Officer, with two
auxiliary men and two volunteers, proceeded to disassemble the
stern plane train and worm gear box located between the torpedo
tubes. We were fortunate indeed that this casualty did not occur
in the vicinity of Luzon or on an approach because we were
positive that under no circumstances would we have been able to
maintain speed to regain depth. Naturally, with no planes on her, it
would have been impossible to effect the desired. The entire stern seemed about to be rent apart. We worked
feverishly with wooden wedges, jack bars, and cable to arrest the
fore and aft movement of the stern plane ram. Our maximum speed
was 4.5 knots. Any greater speed resulted in violent motion of
the planes which might have done serious damage to the after
Trim Tank. After a conference with the First Lieutenant and
Engineer Officers, concluded that the planes should be secured at
zero if possible and that this could only be accomplished submerged.
GUINARD offered to stand by until tomorrow night in case any
serious developed.

1930 (H) Surfaced. Contacted GUINARD by light regarding our condition.
Received message from CTF 71 regarding our difficulty.
2204 (H) Sent GUITARRO Serial No. 009 to CTF 71 regarding our difficulty.
2342 (H) Contacted GUINARD by light and informed her of our difficulty.
Received message from CTF 71 offering assistance. Informed CTF 71
that GUINARD was standing by. Proceeding in company with GUINARD.
Stern planes were cast loose and the
open out from both. Stern planes were cast loose and the
madly from the effects of a choppy sea.

4 January 1945

0103 (H) Received message directing us to proceed to West of Mindoro.
0500 (H) Dived. Decided to dive early in order to secure planes as soon
as possible. GUINARD offered some time later after first obtaining
an early morning scope for us.

1600 (H) Completed securing stern planes on 4° dive position. The First
Lieutenant and Engineer Officers and four auxiliarymen deserve
the highest credit for this job. It took almost thirty hours of
continuous work on their part to complete.

1900 (H) Surfaced. Contacted GUINARD.
1915 (H) Parted company with GUINARD.
1951 (H) Received Serial #49 from CTF 71 informing us that our rendezvous
was indefinite.

- 8 - ENCLOSURE (A)

— page 148 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Fourth War Patrol.

4 January 1945

2330 (H) Sent GUITARRO Serial #2 to CTF 71 informing him of our intention
to arrive at point 0800(H) 6 January 1945.

5 January 1945

0450 (H) Exchanged recognition signals with USS CAIMAN.
0745 (H) Sighted USS BREAM. Exchanged visual signals with her. BREAM
stood by while we made a trim dive.
0906 (H) Parted company with USS BREAM.
0950 (H) SD Radar contact at 34 miles but plane did not come closer than
32 miles so we did not have to dive.

6 January 1945

0200 (H) Arrived at a point 15 miles west of point decided patrol along
North-south line here and to dive during daylight hours to prevent
embarrassing contacts with planes.
0624 (H) Dived.
1827 (H) Surfaced.

7 January 1945.

0620 (H) Dived.
1827 (H) Surfaced.

8 January 1945

0617 (H) Dived.
1827 (H) Surfaced.

9 January 1945

0620 (H) Dived.
1827 (H) Surfaced.
1935 (H) Received Serial from CTF 71 telling us to move south to new
position off MARIE LOUISE in order to clear new air-surface zone.
2358 (H) Sent Serial to CTF 71 acknowledging order to move south.
Also sent weather report in response to CTF 71, Serial 81.
2400 (H) Took up new station.

10 January 1945

0616 (H) Dived.
1830 (H) Surfaced.
2100 (H) Heard object hit forward torpedo room and aft near maneuvering room.
Pit log will not raise. Sound heads O.K. Believe object might have
been water-soaked log. OOD did not see anything on surface. Sounding
gave 2350 fathoms.

- 9 - ENCLOSURE (A)

— page 149 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Fourth War Patrol.

11 January 1945

0520 (H) Received CTF Serial ordering us to rendezvous with friendly
convoy off MINDORO ISLAND. Acknowledged receipt.
0553 (H) Set course for MINDORO STRAIT.
0801 (H) Sighted friendly PBM plane.
1145 (H) Sighted friendly PBM plane.
1520 (H) Sighted friendly PBM plane.
2313 (H) Made SJ Radar contact on land bearing 120° T. Range 65,000 yard.
Commenced transit of MINDORO PASS.

12 January 1945

This is a very anxious moment for all hands. The necessity of
remaining surfaced in vicinity of Mindoro Island during daylight,
for communication purposes until the arrival of the friendly convoy
in mid-afternoon presented many problems. We considered the
possibility of being bombed by Jap planes if we were surfaced
and the same possibility of being bombed by our own if we were
caught diving or surfacing. We broke out our largest ensign
armed with every recognition signal possible awaiting dawn. As
day began to break "swarms" of patrol planes came out of the
East and headed in our general direction. However, they seemed not in
the least interested in us. Only one plane came closer than 5
miles. We identified ourselves with a green rocket and this plane
immediately turned away. As soon as it was fully light ships of
every description could be seen proceeding up and down the MINDORO
COAST and all perfectly oblivious to our presence. For this we
were deeply grateful.

0630 (H) Received instructions from CTF 77 to rendezvous with the DD FOOTE
and DE NICKEL, at 0900 and proceed in company with them to LEYTE
ISLAND.
0722 (H) Sight contact on USS FOOTE and USS NICKEL. Exchanged recognition
signals.
0749 (H) USS FOOTE took station 1500 yard on Stb'd bow and USS NICKEL 1500
yards on port bow. Set course for LEYTE ISLAND. Informed USS FOOTE
(SOPA) that we had previous instructions to join a LEYTE bound
convoy and then to detached if possible and
proceed independently to MIOS WOENDI.
1415 (H) USS FOOTE gave us orders from CTF 77 to proceed independently
to MIOS WOENDI.
1430 (H) Reluctantly parted company with our friends of the surface Navy.

13 January 1945

0000 (H) Sent GUITARRO serial #4 to CTF 71 informing
him of our ETA at MIOS WOENDI.
0606 (H) Made trim dive.

- 10 - ENCLOSURE (A)

— page 150 —
CONFIDENTIAL

U.S.S. GUITARRO, Report of Fourth War Patrol.

13 January 1945

0625 (H) Surfaced.
1310 (H) Sighted PEARL BANK Light bearing 185° T. distance 10 miles.
1333 (H) Dived off PEARL BANK to await darkness for transit.
1930 (H) Surfaced.
2049 (H) Received message from CTF 71 to check our ETA times along route
     to MIOS WOENDI.
2345 (H) Sent message to CTF 71 correcting our ETA.

14 January 1945.

0600 (H) Made trim dive.
0615 (H) Surfaced.
0705 (H) "SD" radar contact on B-24.
1135 (H) "SD" radar contact on B-24.
2118 (H) "SD" radar contact on unidentified night flying plane.
2353 (H) Commenced transit of STAOE PASSAGE.

15 January 1945

0035 (H) Sighted light on what appeared to be a small boat. No SD Radar
     contact. Boat finally disappeared behind one of the many small
     islands to north.
0100 (H) Completed transit of STAOE PASSAGE.
0258 (H) AFR contact. Turned on "SD" radar and immediately picked up a
     pip at 8 miles. The contact closed quickly to 4 miles without
     an IFF identification so at
0300 (H) we dove as best we could. Luckily, the boat was slightly heavy aft
     and we took no more than a 7° down bubble. No bombs but plenty
     of excitement for all hands. The diving officer did a nice job
     though, and we leveled off at 100' without any difficulty. From
     daylight until dark today we saw planes, too numerous to
     describe. We saw almost every conceivable type of plane
     of from one to fifteen or twenty in formation. Evidently
     planes were from MORATAI. Of all the planes we saw only a
     few approached closer than two miles and none of these turned
     to be difficult. If a recognition flare was fired they immediately
     drew off and left us alone. Somebody must have given them a lot
     of briefing.

16 January 1945

Today is almost the same as yesterday with regard to planes. They
were quite numerous but gave us no trouble.

- 11 - ENCLOSURE (A)

— page 151 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Fourth War Patrol.

16 January 1945.

1557(H) Made rendezvous with H.M.A.S. FALCO. Proceeding to USS TUNDI
in company.

17 January 1945.

1345(H) Moored sth'd side to USS CLIFFORD, at FICS TUNDI.

- 12 - ENCLOSURE (A)

— page 152 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Fourth War Patrol.

(C) Weather

     The monsoon ran strictly according to form in the Capes
PADARAN - VARELLA area, with winds of up to twenty-five knots blowing
continuously from the northeast. An overcast of high cirrus clouds
was practically invariable, and was usually accompanied by a low
layer of scud to solid cloud.

(D) TIDAL INFORMATION

     The monsoon current was a distinct and irritating problem off
CAMRANH BAY. The set varied consistently from about 180° T. off the
entrance to about 210° T. twenty or more miles out. The velocity
varied with the wind velocity according to doctrine, but with a time
lag of about two days between wind changes and currents changes. The
current averaged from 2.5 to 4.0 knots over twelve hour periods.
Usually staying about 3.3. The battery was panting and exhausted
after trying ever to stay in one place all day. No explanation
is offered for the fact that the current runs faster by day than by
night.

(E) NAVIGATIONAL AIDS.

     No lights were observed to be lighted from MUI DAVAICH to
HON LON, but piloting by radar at night and by periscope in daylight
was made easy by the many conspicuous humps and bumps on the coast
itself. Small rugged islands along the coast and off the coast
offer good land marks as well as cover for patrol vessels. (HON LON
is evidently a favorite spot for these low fellows). HON LON,
though dark, is very conspicuous by day.

- 13 -
ENCLOSURE (A)

— page 153 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Fourth War Patrol.
(F) SHIP CONTACTS.

No. | Date | Time | Lat. & Long. | Type | Initial Co. Range | Spd. | Brng. (T) | How. Cont. | Remarks
----|------|------||------||------|||
1   | 16 Dec | 0730 | 10-48.7 S    | "SS" | 13,000            | 209  | 357       | SD        |
    |      |      | 114-57.4 E   |      |                   |      |           |           |
2   | 17 Dec | 2246 | 09-34 S      | Unkn. | 11,750            |      | 342       | "R"       | 2202 Lost
    |      |      | 116-41 E     |      |                   |      |           |           | Brg. 245
    |      |      |              |      |                   |      |           |           | Rng. 12000
3   | 17 Dec | 2340 | 09-34.8S     | "SS" | 14,200            |      | 306       | "R"       | SJ Radar
    |      |      | 116-41 E     |      |                   |      |           |           | interference
    |      |      |              |      |                   |      |           |           | contact
    |      |      |              |      |                   |      |           |           | disappeared
    |      |      |              |      |                   |      |           |           | soon after
4   | 19 Dec | 1010 | 05-02 S      | Unkn. |                   |      | 050       | "R"       | Sighted
    |      |      | 116-48 E     |      |                   |      |           |           | small
    |      |      |              |      |                   |      |           |           | sampan
    |      |      |              |      |                   |      |           |           | at 1030
    |      |      |              |      |                   |      |           |           | lost
    |      |      |              |      |                   |      |           |           | sight at
    |      |      |              |      |                   |      |           |           | Brg. 340
    |      |      |              |      |                   |      |           |           | 030°T
    |      |      |              |      |                   |      |           |           | lost
    |      |      |              |      |                   |      |           |           | at 1120
    |      |      |              |      |                   |      |           |           | 110°T
5   | 22 Dec | 0530 | 02-31N       | "SS" | 12,000            |      | 024       | "R"       | Identified as
    |      |      | 109-04E      |      |                   |      |           |           | USS FLOUNDER
    |      |      |              |      |                   |      |           |           | (SS251)
6   | 22 Dec | 2128 | 02-10.7N     | "SS" | 8,500             |      | 315       | "R"       | Identified as
    |      |      | 109-00E      |      |                   |      |           |           | USS PONITO
    |      |      |              |      |                   |      |           |           | (SS 265)
7   | 23 Dec | 0855 | 00-27.3S     | Sailboat | 14,000            |      | 070       | SD        | Avoided
    |      |      | 108-00E      |      |                   |      |           |           |
8   | 23 Dec | 1000 | 00-27.3S     | Sailboat |                   |      | 050       | SD        | Dived - peris
    |      |      | 108-00E      | 90 tons |                   |      |           |           | Avoided
9   | 26 Dec | 1545 | 11-30.3N     | (1) AP | 11,000            |      | 080       | "R"       | Sighted
    |      |      | 109-30E      | (1) CA |                   |      |           |           | at 1600
    |      |      |              | (1) DD |                   |      |           |           | Lost
    |      |      |              |      |                   |      |           |           | contacts
    |      |      |              |      |                   |      |           |           | 1600 LCT
10  | 29 Dec | 0700 | 11-48.5N     | "PG" | 4,000             |      | 089       | "R"       | Avoided
    |      |      | 100-31E      |      |                   |      |           |           |
11  | 29 Dec | 2012 | 11-31N       | Unkn. | 10,000            |      | 352       | "R"       | Lost contact
    |      |      | 109-29.5E    |      |                   |      |           |           | at 2050
    |      |      |              |      |                   |      |           |           | 13,000 yds.
12  | 3 Jan  | 0547 | 12-02 N      | "PG" | 15,000            |      | 262       | "R"       | Avoided
    |      |      | 100-32E      |      |                   |      |           |           |
13  | 5 Jan  | 0440 | 12-35.8N     | "SS" | 11,000            |      | 085       | SD        | Identified as
    |      |      | 113-24E      |      |                   |      |           |           | USS CABEZON
    |      |      |              |      |                   |      |           |           | (SS 334)
14  | 6 Jan  | 0745 | 17-35.3N     | "SS" | 12,000            |      | 151       | SD        | Identified as
    |      |      | 113-24E      |      |                   |      |           |           | USS PERCH
    |      |      |              |      |                   |      |           |           | (SS 313)
15  | 14 Jan | 1040 | 04-42.5N     | Sailboat | 13,600            |      | 188       | "R"       | Avoided
    |      |      | 121-52.9E    |      |                   |      |           |           |
16  | 15 Jan | 0036 | 03-30N       | Unkn. | 8 Miles           |      | 010       | SJ        | Avoided
    |      |      | 125-29E      |      |                   |      |           |           |

- 14 -
ENCLOSURE (A)

— page 155 —
CONFIDENTIAL
USS GUITARRO - Report of Fourth War Patrol
CC ABOVE DATA
(I) MINOR
(J) ANTI-SUBMARINE MEASURES AND EVASION TACTICS.

The Japanese employed the usual anti-submarine devices off GAIM
BAY. On two occasions during the light of the moon surface patrols were
encountered off the entrance. The purpose of these patrols was not
definitely known but it is believed that either they had definite knowledge
of our presence in the vicinity, or that convoys were expected in the
vicinity. No contacts with ships were made on either day following the contacts. On
one occasion we were forced to dive for a night flying plane. Another
Japanese plane was picked up on the APR-1 on evening upon surfacing. One
peculiar and unexplainable fact about this area was the almost daily occurrence
of heavy explosions which could be heard over the sound gear and through the
hull. The explosions sounded like depth charges and were considered to be a
large number but periscope observations revealed nothing in sight.

(K) MAJOR MATERIAL DEFECTS

1. On 16 December 1944 an excessive amount of noise from the master gyro
compass mutator panel was noted. Inspection revealed that a resistor in the
Transmitter Rectifier Unit had dropped down to the bottom of the screen
housing and was vibrating. This resistor, a C.H.D. 5, is one of the
111-1, and its removal had no apparent effect on the compass operation.
It is believed that this resistor has been knocked off during the heavy depth
charging of last patrol, as it showed evidence of violent removal from its
mounting.

2. On 20 December 1944 the master compass tumbled and steering was shifted
to the Mark IX compass. The first inspection revealed a spring similar to
the coil springs which center the gyro units, lying adrift on the sensi-
tive element. The spring was removed and the compass was leveled. The
compass started continuous procession which endured for 3 hours. Another
inspection revealed that the north-south balance weight was not so
tightening nut and had traveled to the opposite end of the threaded
rod.

3. An exacting process of locating this weight was commenced, with 5
hours settling time allowed between each adjustment. Four days later, on
Dec. 24, an azimuth revealed an error of only 1° East, so steering
was shifted back to the master compass.

- 16 -
INCISUFI (A)

— page 156 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Fourth War Patrol

2. KLEINSCHMIDT DISTILLING UNITS

The potable water produced by the evaporators this patrol was so high
in nickel content as to make it unpalatable. After the Fremantle water had
been removed from the tanks, many members of the crew became sick from evapora-
tor water. We considered running potable water through the Ion Exchangers to
remove the nickel, but decided that the chemical filters would not stand
the load of both battery and potable water. It is strongly advised that the
present coils which have had four coil cleanings, should be removed and the
ship be given this refit.
An alternate suggestion would be the installation of Ion Exchangers in the
fresh water lines from the evaporators.

3. MAIN REDUCTION GEARS

The three hour full power run conducted while enroute to Exmouth Gulf
from Fremantle was successfully completed. The maximum bearing temperature
was 165° F. with 70° F. injection temperature. The noise in the port gear
localized in the spiral gear of the attached lube oil pump; and the
intensity has increased somewhat. It is now possible to hear the port gear
on the JP-1 sound gear while rigged for silent running and making 38 shaft
turns.

4. STERN PLANES

On 3 January 1945, at which time the ship was submerged at periscope
depth, control of the stern planes was lost. Following an inspection by the
Engineer Officer and First Lieutenant it was discovered that no power or
motion was being transmitted to the worm gear on the longitudinal connection
rod located between 90 and 100 torpedo tubes. The upper half of the gear
housing was removed and by inspection it was apparent that the gear
nut had been stripped. Due to the location of this gear box, further
disassembly was attempted
inability to secure the planes, further repairs could not be effected.
Further repair was not attempted.
At night, following the surfacing the planes commenced flailing from full
rise to full dive and it was feared that after Trim tank might become
damaged at the packing glands. By careful use of slow surface speeds,
and numerous wedges, the shaft was secured with the planes on 4
degrees dive. Following this the bull gear hub was drilled as well as the
worm gear shaft and lengths of 3/8" steel drill rod inserted to prevent
rotation and aft motion of the connecting shaft. Chain falls were used in
to secure the shaft. The sump of the gear housing was at the time
full of oil sludge containing many small particles of metal, which apparently
came from the oil retaining rings and the traveling nut. The excessive
wear in the bull gear, pinion gear, traveling nut and the ball bearings
would seem to be the result of combined misalignment and faulty lubrication
over an extended period of time. This gear failure is the second we have
experienced on our stern planes, and it is very strongly desired by the
Commanding Officer that a complete examination be made of bearings and of
stern plane gears for excessive wear and misalignment.

- 17 -
ENCLOSURE (A)

— page 157 —
CONFIDENTIAL
U.S.S. GUITAREO, Report of Fourth War Patrol.

4. STERN PLANES CONT.

The gear box on the overhead was considered excessively noisy at the
time of the last refit and would have been replaced had a spare been
available. It is desired that these gears also be replaced if possible.

5. AIR CONDITIONING & REFRIGERATION.

The air conditioning plants operated satisfactorily until 15
December 1944, at which time a considerable rise in the temperature
of the discharge air from both sets of coils were noted. There was
no appreciable rise in injection temperatures at this point, yet the
temperature in the boat was 6-9° higher. The expansion valve
proper coil in the after battery compartment did not seem to be operat-
ing properly and was removed and inspected for excessive wear
or defects. It appeared normal and was reinstalled. It was then
found that the plant with the bypass open on this unit, that
the boat could be made habitable. It is considered that possibly the
needle valve, controlled by the solenoid may be rust or dirty, but
no attempt to pull this valve was made on patrol. During the
next refit it is desired that the entire air-conditioning and refrig-
eration systems be thoroughly overhauled, that new dehydrators be installed,
that all the systems be checked thoroughly for leaks and calibrated
to give the best possible performance. The sporadic operation
of the units gives rise to the belief that the dehydrators are no
longer functioning properly, and that there may possibly be water or
moisture collecting in the expansion valves, which were frozen on
two occasions. In addition there are serious leaks in the refrig-
eration system, which were detected with the Helide torch and it
is desired that these be eliminated during the coming refit.

6. #7 M.P.T. VENT

On 26 December 1944 following an approach which was thwarted
by aircraft bombing, it was noted that #7 M.P.T. failed to shut
either in power or hand. At the time it was believed that an ob-
struction in the superstructure was the cause of the failure. Con-
siderable knocking in the superstructure had been noticed when the
ship was rigged for silent running and it was believed to be related
to the failure. An attempt was made to examine the superstructure
for obstructions, but rough seas prevented this from being done.
Shortly after the failure, the hydraulic lever operated a number of
times and the vent finally shut. Difficulty was experienced on one
other occasion in shutting the vent in power and the vent has been
sluggish in power operation. It is desired that the hydraulic
cylinder be checked thoroughly during the refit period and the
superstructure be examined carefully for possible obstructions.

- 18 - ENCLOSURE (A)

— page 158 —
CONFIDENTIAL
U.S.S. GUITARRO, Report of Fourth War Patrol.

7. TORPEDO & GUNNERY

On December 21 all torpedo tubes were made ready to fire at a
KATO Class Battleship but the attack was frustrated by six not-to-close
depth charges which shook the boat somewhat. The tubes were secured and
submergence ordered. One hour and fifteen minutes after the tubes were
secured, ENSIGN J. I. COLE noted a sound of escaping air from the
vicinity of #3 tube. He immediately located the leak in the firing valve
pilot valve line. By his quick action in bleeding down the impulse
line and opening the inner door and vent, it is believed he prevented
a torpedo being fired with the outer door closed.

The leak was due to a ruptured line just at the silver soldered
joint of the pilot valve. It was impossible to repair this leak so the
valve housing was removed and the nipple drilled out. A 4 inch
length of high pressure tubing and nipples was constructed and
installed. A 350 pound test pressure was put on this line and
several inboard slugs fired. As far as we are able to determine, it works.

(I) RADIO

A continuous watch was stood by this vessel on the following fre-
quencies: 4370 KCS and 9250 KCS for the purpose of copying NIXO
traffic. Reception on these frequencies was satisfactory and it was never
necessary to shift to a frequency higher than 9250 KCS. Consider-
able jamming from Jap stations was encountered on both 4370 and December
did not prevent traffic reception. Between December 11, 1944 and December
19, 1944, abnormal drifting of frequency was experienced on all fre-
quencies, but this trouble cleared, probably due to atmospherics.
During the entire patrol 9250 KCS proved to be the best frequency
for reception. Direct communications with NIXO were very satisfactory.
8470 KCS was used exclusively. Interference from other sources was negligible.
Several attempts were made to communicate by voice call over the wolf pack
frequencies but all were unsuccessful. In one instance, the ship to which
we were transmitting was only 7,000 yards away. Voice call reception, however
was fairly good. The reason for our inability to transmit has not been
determined. Because of our inability to transmit voice, all transmitting
was by CW, and fairly good results were obtained.

(K) RADAR

The SJ performed in an outstanding manner during its period of
operation. The ranges to land obtained on it proved conclusively that
it is not the medium unit itself which often determines the power output,
but the alignment and proper installation of the wave guide, feeder unit
and power tube assembly. When all this had been done on this submarine
as shown by the ease with which second return echoes were obtained on even
medium size mountain peaks (5000 feet).

- 19 -
ENCLOSURE (A)

— page 159 —
CONFIDENTIAL

U.S.S. GUILJARRO. Report of Fourth War Patrol.

(N) RADAR CONT. SD-4

How well the SD performed this patrol is shown in the startling fact that 31 aircraft but one obtained on it and at a minimum of 9 miles. The maximum range obtained on a target, presumably a high flying patrol bomber, was 34 miles.

Enroute to the area trouble was experienced in loading the unit and keeping the sweep clear of local noise interference. Replacement of the 8014-A oscillator tube and retuning of the diplexer eliminated the above faults. A remote control switch for keying the unit was also installed, removing the inconvenience the operator formerly had of stretching continually over the navigator to cut in the high voltage.

An attempt will be made during the coming refit to move the SD to some other position than over the chart desk and to shift the QAO wavemeter to an adjacent main there it may be viewed with convenience. At present it is up against the control room overhead.

A good test of the ability of the radar was obtained on the small islands north-west of YAEIMATA STRAIT, whose height above sea level was from 60 to 1000 feet. These were contacted at a range from 12 to 19 miles and the range and target verified visually and by the SJ-A.

Since reports have been obtained of so many inefficient SD's, all our transmitters and receivers of all our fundamentally alike, the good one appears to be in a good installation of the coaxial line and a properly matched antenna of high standing wave ratio.

IFF

No material or operation troubles were encountered in the FM interrogator and the APX transponder. Both were used very sparingly and on the few occasions enroute to the barrier responded with definite indications at ranges from 14 to 19 miles.

APR-1 - SPA

The potential value of this combined radar detecting and indicating receiver is unlimited, but at present it is used at approximately 50% efficiency. The addition of the AP/SIA-1 makes identification of radar pulses definite and has proven conclusively that an audible indication of radar is not a certain indication of a radar unit. During this patrol there were found seven frequencies in the TN-2 band which originated from the interior of the ship. Their values were as follows: 100 CS, 180 CS, 200 CS, 240 CS, 280 CS, 310 MCS.

There arises the problem of using the TN-2, (80-300Mc) TN-3 (300-1000Mc) and the TN-4 (1000-3000Mc) coils on the TN-2 antenna since the one for the higher frequencies is not installed. Some means should be made to improvise an antenna to span all the above hand bands efficiently.

- 20 - ENCLOSURE (A)

— page 160 —
CONFIDENTIAL

U.S.S. GUITARRO, Report of Fourth War Patrol.

The new slotted type antenna proved to be a great improvement over the
solid back in receiving target side lobes at close range. The echo from
the U.S.S. GUITARRO at 1200 yards persisted over an azimuth of 15 to 20
degrees with the new antenna, whereas on previous occasions this angle would have been
approximately 160 to 170°. Since no aircraft contacts were obtained
there was no opportunity to determine whether the aircraft
detection ability to contact them at larger ranges and greater
altitudes. An indication as to the performance of any radar equipment is the ranges
obtained on definite and easily identifiable objects. The following ranges
are used as a standard of performance for this unit.

Submarine                               12,000 to 14,000 yards.
Aircraft (9,000 ft. peak)               160,000 to 170,000 yards. Second return echo
Periscope light                         38,000 to 42,000 yards.
China Coast (6,000 ft. peak)            110,000 to 140,000 yards. Second return echo
U.S.S. TEALL type                       14,000 to 16,000 yards.

It is hoped that the following alterations and repairs be made to
the unit during the coming refit:
1. Clean out of mud.
2. Increase the angle of tilt of the P.J. unit so that the scope
may be viewed without needing one's head between it and the ready light
indicator panel.
3. Properly overhaul the motor generator. It has not been
satisfactory for the past four patrols. The defect seems to be a misalign-
ment of the armature.
4. Center the precision screw with respect to the main
top bearings.
5. Remove excess clearance from the bearings and gears of the
antenna training unit.
6. Install cover tubing grease lines to the middle and bottom
of the torque tube so that they may be lubricated from a position
on the shears on the bridge.

The interference of a similar SJ first appears at ranges
that vary by 40,000 yards and contact on the other sub is usually lost
at 10,000 yards. The interference is obtained on all bearings. No
recommendation in changing reception signals or messages by
transmit and receive and the pulse amplifier proved a boon in making this
a master arm at long ranges.

The atmosphere throughout most of this patrol was conducive to good
ranges. The sky is continually blanketed with low hanging clouds
and a cool temperature prevailed.

- 21 -
CONFIDENTIAL (A)

— page 161 —
CONFIDENTIAL
U.S.S. GUDGEON Report of Fourth War Patrol.

(I) RADAR CONT.

One definite contact was obtained off CALLAHAN BAY and appeared to be
a warning air search radar using one revolution every 2 minutes.
Its characteristics were: Frequency 200mcs. PRF 1000-1100 P/s, Pulse
width 6-8 micro-seconds, Sign 1 strength 4-5. This unit seemed to have direction
characteristics indicated by regular variation in signal strength as the
antenna was rotated.

RADIO

No trouble was encountered in transmission yet a resistance check
on the antennas at the base of the trunk shows almost a zero
to ground. A complete overhaul of the trunk should be made. No major
difficulties worthy of note were encountered in the receivers but it is
hoped that Kingsbury high frequency unit will be installed to facilitate
reception on the higher bands.

Plans are herewith submitted to relocate the units in the Radio shack
to make room for the Kingsbury and spare parts cabinet. The I.C. Safe
is to be removed since it is of no value to the present date.

(F) SOUND

The seas and weather encountered in this area of the South China
coast was not conductive to good sound reception. The seas were continuously
heavy and high winds prevailed. It is worthy to note that in all contacts
made, the J-L was still the first to detect them although the
contact ranges were much shorter than on previous patrols. On the Cruiser
with rough weather and low visibility the maximum range was approximately
4000 yards. The QB and JL then responded. When coached on the bearing
giving no poor is evinced by inability of the destroyer escort
to detect us previous to being sighted by aircraft and subsequent failure
to locate us with short deep submergence although searching almost directly
over us.

The policy of manning the JL-1 and JL during submerged patrol
surface search seems to be a good one, since it divides the work
almost evenly between the two supersonic units. The QB is not
effective to the ranging and it is best turned up to a speed
with this a prominent factor in mind.

A complete overhaul of the projector head shafts and fiber bearings
will be necessary since they are becoming noisy and jerky during training.

- 22 -
INCLOSURE (A)

— page 162 —
(C) [UNCLEAR: DISH] [UNCLEAR: AMES]

| Time of | Lat. & | Surface | Remarks |
| Date | Long. | Temp. | |
| 2100(2) | 8-25S | 85° F. | Isothermal to 120' No break |
| Nov. 21 | 115-51W | | or negative |
| 0209(2) | 9-05S | 72° F. | Isothermal to 140' |
| Dec. 2 | 110-04W | | |
| 2200(2) | 10-05S | 76° F. | Isothermal to 200' |
| Dec. 7 | 109-24W | | |
| 2100(2) | 11-4W | 76° F. | Isothermal to 250' |
| Dec. 17 | 107-50W | | |
| 2100(2) | 12-0S | 82° F. | Isothermal to 110' |
| Jan. 7 | 120-42

— page 163 —
CONFIDENTIAL
U.S.S. CHUTTARK, Report of Fourth War Patrol

(R) FUEL STATUS - USN.

Base to Area. 1711 21,150 gallons
In area 2520 32,045 gallons
Area to Base 2068 20,785 gallons

(S) DURATION:

Days enroute to Area 7
Days in Area 25
Days enroute 6
Days submerged 19

(T) FACTORS AND DURATION OF PATROL:

Torpedos Fuel Provisions Personnel
24 45,000 30 days 30 days

Limiting factor on this patrol was the casualty to the stern plane
which made diving and depth control very difficult and periscope watch
impossible except in a flat sea.

(U) RADIO & RADAR COMMUNICATIONS:

None.

(V) REMARKS:

The casualties which occurred on this patrol were more than normally
to be expected. With the facts which are at hand it appears to me that
the issue for a considerable number of the casualties may be due in part, if
not totally, to the severe depth charging and the explosion of an ammunition
at close quarters during the third war patrol of this vessel. The effect
so heavy on lesions has manifested itself in direct damage to the hull
and indirect damage caused by a distortion of parts of the hull.
First, the port reduction gear has developed a noise, which appears to be
increasing gradually with time. This noise could at first be heard only 2/3
speed submerged in the maneuvering room. However the intensity has seemed
increased now to the extent that it can be heard at 1/3 speed and can also
be detected by JP sound gear. Pinion bearing temperatures on the port
gear are higher than ever before.
Second, the port shaft has developed an intermittent squeal which can be
heard over "JP" sound gear.
Third, the stern plane worm gears are worn excessively. This wear may be due
entirely to lubrication difficulties but I am of the opinion that the degree
of wear indicates the possibility of mis-alignment.

- 24 - ENCLOSURE (A)

— page 164 —
U.S.S. GUDGEON
SERIAL 10, Report of Fourth War Patrol

(V) REMARKS CONT.

Fourth, the crack in the 200# air line to the firing valve on #3 tube
and the possibility of rupture due to shock.
Fifth, the cracking noise in the hull over the after torpedo room when the
vessel is below 200' indicates the working of metal plates which may be
loose.
Sixth, the deterioration of #7 M.B.T. vent indicates either a bad
adjustment of the linkage or perhaps a mis-alignment of the operating lever.

Eight Mk 18-1 torpedoes were carried aft during this patrol. This is
the fourth patrol that Mk 18-1 torpedoes have been carried for a total of
20 torpedoes carried.
Although no electric torpedoes were fired this patrol it is felt that
these torpedoes are in the best condition of any yet received.
A torpedo (5596) in #10 tube was charged on December 1 for 3 hours along
with the other torpedoes in the after torpedo room. The firing
cell readings of 1-765, 2-770, and 3-1270 were obtained. The torpedo was ventilated for 15 minutes
with the blower and re-filled in the tube. The torpedo was then
removed and re-charged with air after the torpedo was replaced in the tube and
the air was removed and re

— page 165 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

A. PROLOGUE

Arrived at MICS WOENDI and moored to U.S.S. GRIFFIN at 1245, 17 January
1945. U.S.S. GRIFFIN commenced a five day refit. The following major work
was accomplished:-

(1) Repaired stern plane casualty.
(2) Complete overhaul of all main and auxiliary engines.
(3) Complete overhaul of all batteries.
(4) Repairs to air conditioning and refrigeration units.

Ready for sea 25 January 1945. Due to impending operations, ship
was held over until 30 January 1945. During the period 25 - 30 January, 3
days of training with a submarine schedule, half of each day was given to the
submarine for training runs and half to the other half. The submarine acted
as target for sound runs and the other half as target for torpedo runs. At
1500 (Iboe) 30 January 1945, departed MICS WOENDI for patrol.

B. NARRATIVE

The following named officers and chief petty officers, together with
the total number of war patrols each has made, were attached to and serving
on board this vessel at the beginning of the second phase of the fourth war
patrol:-

DABNEY, Thomas Bullard Commander U.S.N. 7
ENNIS, William Waggaman Lieutenant U.S.N. 4
TRAYLOR, James Thomas Lieutenant U.S.N. 3
BRACCIA, Anthony Augustine Lieutenant U.S.N.R. 0
SCHILANSKY, James Leonard Lieut. (jg) U.S.N.R. 3
FARR, Arthur Harrison Lieut. (jg) U.S.N.R. 3
BERNARD, David George Lieut. (jg) U.S.N.R. 3
HAWES, Donald Keene Ensign U.S.N.R. 1
CROWNOVER, Edgar Paul Ensign U.S.N. 7

BARNES, Clifford McCarty CEM(AA) U.S.N. 1
FISHER, Frank Aubrey CEM(AA)(T) U.S.N. 1
HIRSCH, Irvin Jack CTM(T) U.S.N.R. 1
KEINWATH, Frank Charles CMM(AA) U.S.N. 5
KOFEY, Theodore (n) CMOM(AA) U.S.N. 3
RAGSDALE, James Brittain CT(AA)(T) U.S.N. 9
RAWDON, Clark Allen CEM(AA)(T) U.S.N. 10
STEWART, John Henry COS(T) U.S.N. 4
WALLS, Carl Harold CTM(AA)(T) U.S.N. 6

- 1 -

— page 166 —
C-O-N-F-I-D-E-N-T-I-A-L
USS GUITARRO
Fourth War Patrol

30 January 1945.

1400(H) Departed MTOS WOENDI for patrol in accordance with C.T.F. 71
despatch of January 1945. HMAS STAVELL acting as escort.
1644(H) Made trim dive.
1653(H) Surfaced.
1730(H) Conducting Radar Tracking drill and night surface approaches
with escort.
2100(H) SJ radar contact with unidentified ship at 17,500 yards. Ship
was headed for BIAK. Did not attempt to exchange recognition
signals with him as he was apparently a large merchantman which
came no closer than 12,000 yards.
2130(H) While policing the boat, discovered a stow-away from the U.S.S.
GRIFFIN sleeping in one of the after battery bunks.
2234(H) Received a message from C.T.G. 71.5 saying that MILES, Richard
Eugene, 859 31 79, Sealc., USNR was missing from the U.S.S.
GRIFFIN and presumed to be aboard the GUITARRO, and if aboard
we were to transfer him to HMAS STAVELL for return to MTOS
WOENDI. The stowaway on board was assumed to be MILES.

31 January 1945.

1400(H) Transferred stow-away to HMAS STAVELL. This man denied he was
MILES and insisted that he was JONES, C.E., 625 29 73, Sealc.,
USNR from the USS GRIFFIN. After searching the boat and find-
ing no other culprits aboard, decided that he must be the man
we were looking for, despite his false name. He was greatly dis-
appointed at being sent back and pleaded to remain aboard in
any capacity. Despite his complete equipment, which he car-
ried in a well tailored canvas bag, and his loud protests, we put
him into the boat and sent him off.
1600(H) Chief of the Boat discovered MILES, Richard E., 859 31 79, Sealc.,
USNR secluded in the motor room. As the escort was now long gone
there was nothing to do but keep him aboard. So at
1615(H) we sent a message to C.T.G. 71.5 informing him of the situation.
1620(H) Practice gun firing.

1 February 1945.
0518(H) Made trim dive.
0525(H) Surfaced.
1606(H) Sighted masts of large convoy bearing 255°T (almost dead ahead),
range 30,000 yards. Convoy was on a northerly course just east
of MOROTAI ISLAND. We slowed to 6 knots and altered course to
pass astern. Put up our largest colors, lowered sound heads
and made ready all emergency identification signals. Convoy
was well screened by aircraft and destroyers. When nearest
escort had closed to ten miles, we commenced to challenge him
with 12" light and by sound gear. After about 5 minutes

- 2 -

— page 167 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

B. NARRATIVE (Cont.)

1 February (Cont.)

frantic flashing the DD finally saw us and replied. I am sure
our presence was quite a surprise because there was considerable
searchlight flashing from all quarters shortly thereafter. About
fifteen minutes later a Liberator bomber proceeded to investigate
us very closely. We fired our recognition rocket and mortar
and spread a /W/ ensign its full length. After much deliberation,
the bomber departed.
1938(H) Dived.
1952(H) Surfaced.
2250(H) Master gyro out of commission (see casualty report).

2 - 3 February 1945.

0849(H) Dived.
0900(H) Surfaced.
2215(H) Sent message to C.T.F. 71 informing him of gyro casualty.
2320(H) Received C.T.F. 71 serial directing us to proceed to rendezvous
point.
0330(H) Transmitting SIPUTU PASSAGE. Sent message to C.T.F. 71 informing
him of our ETA at point.
0730(H) Transmitting passage at PEARL BANK.
1400(H) Received message from C.T.F. 71 directing us to proceed to ren-
dezvous with U.S.S. NICHOLAS (DD449).

5 February 1945.

0630(H) Sighted U.S.S. NICHOLAS (DD449).
0705(H) Fell in with NICHOLAS. NICHOLAS sent us a message that he had
10 gallons of ice cream for us and would take any mail that we
had. This was a very pleasant surprise and was deeply appre-
ciated by all hands.
0800(H) NICHOLAS came alongside to port and with both vessels making
14 knots, the DD passed us a breeches-buoy. The transfer of
supplies took place quickly and efficiently. We sent the DD
a case of eggs which they greatly appreciated since they had
not seen any since November. This transfer by breeches-buoy
was an interesting and instructive experience.
1015(H) Lookout sighted man in water about 1500 yards to starboard.
Sheered out of column and approached him. Rescue party on
deck. Made out man to be either a Phillipino or Japanese
soldier carrying a rifle and astride a ten foot bamboo pole
of about 3" diameter. With the help of our men on deck we
hoisted him aboard. Despite his weakness from several days
of exposure, he insisted on rendering a snappy military
salute. The rescued person identified himself as a Phillipine
boy about 18 years old and a member of the Philippine Con-
bulary. He and some friends were caught in a small boat

- 3 -

— page 168 —
1-0-N-F-I-D-E-N-T-I-A-L
USS GUITARRO
Fourth War Patrol

B. NARRATIVE (Cont.)

5 February (Cont.)

during a typhoon. Our pharmacist's mate looked him over and
prescribed some warm food. A gunner's mate provided some
clean dry clothes. Later we transferred him to the destroyer
which had rescued 5 others from the same boat.
2305(H) Parted company with NICHOLAS.

6 February 1945.

0500(H) Sent message to C.T.F. 74 informing him of ETA area.
0755(H) Dived.
0809(H) Surfaced.
1120(H) Dived.
1137(H) Surfaced.

7 February 1945.

0639(H) Dived.
0709(H) Surfaced.
1020(H) Unidentified plane closing fast.
1023(H) Dived.
1131(H) Surfaced.
2300(H) Entered Area.

8 February 1945.

0050(H) Exchanged recognition signals with USS BASHAY (SS241).
0615(H) Dived 10 miles off INDO CHINA Coast - commenced submerged
patrol.
1928(H) Surfaced - patrolling close inshore.
2225(H) Radar contact on small patrol boat course 060°, speed 10 knots,
range 9,000 yards.

9 February 1945.

0613(H) Dived off coast - periscope patrol.
1020(H) Sighted 3 Japanese "Tei" patrolling up and down coast.
1100(P) Sighted two Japanese (Koli and Jake). These explosions
1150(H) Heard first explosions, heavy explosions. Some were estimated
sounded like both depth charges and bombs. Some were estimated
to be as close as 2 miles and others at 8 - 10 miles.
The first charge went off just after a periscope observation.
We continued to take periscope observations at 10 - 15 minute
intervals - expecting to sight a large convoy of some descrip-
tion. Although our position was within 5 - 8 miles of boat.
no ships were sighted. The visibility to seaward was very
poor, with heavy overcast and rain. Finally at
1345(H) last of explosions. No more planes - all quiet.
1920(H) Surfaced. Patrolling northward close inshore.

- 4 -

— page 169 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

3. NARRATIVE (Cont.)

10 February 1945.

0135(H) Exchanged recognition signals with USS BENGALL (SS320).
BENGALL ordered us to patrol 15 miles off beach on surface
today. BENGALL would patrol submerged off beach.
0659(H) Dived.
0717(H) Surfaced.
0900(H) SJ radar contact bearing 090° T., 20,000 yards.
0901(H) Sighted masts of ship.
0908(H) As we were close to the beach and momentarily expecting to
sight aircraft, decided to dive since his angle on the bow
was small, so to
0908(H) Dived and commenced approach. Battle stations submerged.
0940(H) Ship identified as HIKANA MARU (AP), 11,000 tons, making 15
knots on course 170° T. Broke off approach much to the disap-
pointment of all hands. Took photos from 3000 yards. Ship
was marked in accordance with international law.
1017(H) Surfaced after ship was well clear.
1210(H) Sighted aircraft bearing 355° T., range 10 miles so made a quick
dive.
1319(H) All clear - surfaced.
1535(H) SD contact 9 miles closing so made quick dive.
1721(H) Surfaced.
1939(H) Exchanged recognition signals with USS BENGALL.
2000(H) Commenced patrol close inshore enroute to rendezvous with
BASHW tomorrow evening.

11 February 1945.

0423(H) At northern edge of area, opening out from coast to eastward
on the surface.
1137(H) Plane contact on SJ radar at 16 miles.
1227(H) Plane contact on SJ radar at 15 miles.
1227(H) Plane closed to 12 miles so dived.
1327(H) Surfaced.
1925(H) Exchanged recognition signals with USS BASHW.
2030(H) BASHW came close aboard. We stove and transferred pilot
cautions in accordance with C.T.F. 71 message.

12 February 1945.

0938(H) Patrolling on surface 25 miles off coast.
1117(H) SD radar contact 5 miles so made quick dive.
1246(H) Surfaced.
1400(H) SD radar contact at 14 miles closing, so made quick dive.
1749(H) Surfaced.
Received C.T.F. 71 Serial telling BENGALL to take GUITARRO
and BLOWER and proceed to intercept enemy task force headed
north.
1935(H) Contacted BENGALL by radar - sent visual message informing
her of contents of C.T.F. 71 Serial. Departed area in com-
pany with BENGALL enroute to rendezvous with BLOWER.

- 5 -

— page 170 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

13 February 1945.

B. NARRATIVE (Cont.)

0600(H) Received message from BERGALL, placing us on scouting line,
        course north, speed 12. ten miles to East of BERGALL, and
        telling us to secure SD radar.
0800(H) On station - patrolling on surface
1035(H) SJ radar plane contact at 16½ miles bearing 010°T. Sighted
        plane but unable to identify. Plane disappeared in heavy
        overcast.
1110(H) SJ plane contact 7 miles, bearing 190°T. Lookout sighted
        plane zero angle on bow - 2 engine land based bomber similar
        to "Nell". Range closed to 5 miles and coming in very low so at
        dived to 120 feet.
1112(H) All clear so surfaced.
1135(H) SJ radar contact on plane at 7 miles, bearing 217°T, closing
        fast and identified as same plane as before, so at
1145(H) dived to 120 feet.
1146(H) All clear.
1230(H) 8 large explosions.
1235(H) JP sound gear picked up fast screws bearing 298°T. Battle
        stations submerged - all ahead 2/3 coming to course 300°T.
1241(H) 1 heavy explosion.
1247(H) 4 heavy explosions still nothing in sight.
1249(H) Sighted foretop of what appeared to be BB. Range estimated
        at 12-14 miles. Nothing else in sight. Bearing drawing to
        right. Screws getting weaker.
1250(H) Changed course to 320°T endeavoring to close - considered
        possibility that one of the ships might be seriously damaged
        and we could get in a shot.
1255(H) Screws faded out - nothing in sight. Secured from battle
        stations. Decided to surface and give chase.
1315(H) Sighted large flying boat in clouds about 3 miles away,
        circling our position. Unable to positively identify.
1320(H) Finally he turned toward us so we were forced to go to 120 feet.
1348(H) Surfaced - plane at 9 miles, closing on radar, so dived im-
        mediately. These planes are certainly persistent.
1411(H) All clear so surfaced to try to overtake task force. All
        engines on propulsion.
1426(H) SJ radar contact on plane bearing 310°T, range 7 miles.
        closed to 5 miles and OOD and lookout identified as Jap "Emily"
        with zero angle on the bow and closing at a range of 4 miles, so at
1425(H) Dived.
1531(H) Surfaced - all clear.
        Four engines on propulsion - radar contact on USS BERGALL
        south of us. We made several attempts previously to get a
        contact report but planes prevented us. Finally broadcast con-
        tact blind to C.T.F. 71 and also on Wolf Pack frequency. He
        ordered us to take station 10 miles on starboard beam, course
        North, speed 16.

- 6 -

— page 171 —
CONFIDENTIAL USS GUITARRO Fourth War Patrol

B. NARRATIVE (Cont.)

13 February 1945.
1731(H) Radar contact at 8 miles closing fast, so at
1733(H) Dived.
1818(H) Surfaced - all clear.
2000(H) Strong "APR" contact at 100 megacycles. Cut in SD radar - plane
at 14 miles - unidentified - closed to 13 miles and then opened
out.
2010(H) Received message from BERGALL to reduce speed to 10 knots.

14 February 1945.
0130(H) Received message from BERGALL to change course to 250°T.
0243(H) Heard and felt two explosions.
0851(H) Cut in SD radar - contact at 7 miles closing us, so at
0852(H) Dived.
1017(H) Surfaced.
1125(H) SD plane contact at 10 miles.
1132(H) Plane closed to 8 miles, so made quick dive.
2000(H) Entered our area.

15 February 1945.
0606(H) Dived off coast for submerged patrol.
1400(H) Sighted "Emily" bearing 338°T, range 3 miles.
1610(H) Sighted "Jake" and "Kate", range 3 miles, bearing 260°T patrolling
to north along coast.
1630(H) Sighted "Thelma" bearing 240°T, range 5 miles.
1930(H) Surfaced - patrolling close inshore.

16 February 1945.
0619(H) Dived.
1403(H) Sighted "Thelma" bearing 265°T, range 8 miles on northerly
course.
1423(H) Heard one distant explosion.
1424(H) Heard two distant explosions.
1930(H) Surfaced.
2030(H) Exchanged recognition signals with USS HAKE.

17 February 1945.
0616(H) Dived.
0706(H) Sighted wreckage of tanker - bow and stern detached in about 20-
30 feet of water close in to beach.
1230(H) Sighted "Rufe" bearing 180°T, 10 miles on northerly course.
1325(H) Sighted ship bearing 235°T, range estimated 18,000 yards.
1327(H) Battle Stations.
1340(H) Came to normal approach course, 340°T, all ahead 2/3 endeavoring
to close beach. There was a 3 knot current or better setting
about 170°T. Cannot turn too much toward target or we would be
set down out of range - our only chance was to gain bearing.

- 7 -

— page 172 —
C-O-N-F-I-D-E-N-T-I-A-L U.S. GUITARRO Fourth War Patrol
GUITARRO (Cont.)
17 February (Cont.)

1344(H) Made out ships to be one AO, estimated 8000 tons, one AK 6-7000
        tons, 1 DD and 2 escort vessels plus air cover. Bearing of target
        now 289°T, range 10,000 yards. Doesn't look as though we could
        close. Target had just rounded NUOC ISLAND and turned in toward
        beach again.

1415(H) Target now bore 300°T, range 10-11,000 yards and opening. De-
        cided we would not be able to close within effective torpedo
        range. Apparently the current close inshore was much less than
        that where we were. Concluded our best chance was to open out
        from the beach and sail around on surface. His speed through the
        water was about 7 knots. Apparently the convoy was going to stay
        underway all night. If we were lucky we would overtake him about
        2100 that night and attack on surface.

1510(H) Sighted aircraft bearing 315°T, range 7 miles on southerly
        course.

1604(H) Surfaced 12 miles off beach. Went ahead full on four engines,
        making 16 knots in fairly heavy sea - opening out from beach.
        A successful end-around run depended on our being able to re-
        main surfaced about 15 miles off the beach during three hours
        of daylight and not be detected by aircraft. For the remainder
        of the day day aircraft varying in number from one to three were
        constantly in sight, at range of 10 to 15 miles. How they failed
        to see us is difficult to explain. Extra lookouts were placed on
        the landmark rises. Each time a plane came into sight a lookout
        was assigned to keep him under constant surveillance until he dis-
        appeared. Several times we had as many as three planes in sight
        at once. As the visibility close to the water was hazy, we de-
        cided to arm the 20MM in case a low level plane surprised us be-
        fore we could dive.

1715(H) Sighted a "Rufe" bearing 315°T, elevation 3°, range 14 miles.
        This plane remained constantly in view for the remainder of day-
        light. He was patrolling north and south along the coast, taking
        what we decided was the low level convoy escort, so by taking
        bearings on his mean position, we were able to track the convoy
        as it advanced up the coast.

1902(H) The night was now falling now and from our plot we decided our
        position was close to being abeam of the convoy so we commenced
        to slowly close the beach and work ahead.

2052(H) After rounding the shelter south of CAPE BATANGAN we turned
        south and picked up the convoy by radar. It was several minutes
        before we were able to distinguish between the ships and the
        beach. At 12,000 yards, bearing 245°T, we manned tracking party.
        The ships were about 10 miles south of the Cape. We tracked
        for about one half hour and determined the targets course to be
        350°T, speed nine. We had been maneuvering in water 60 - 90
        feet and until the convoy rounded CAPE BATANGAN, we would not

- 8 -

— page 173 —
C-O-N-F-I-D-E-N-T-I-A-L
USS GUITARRO
Fourth War Patrol

B. NARRATIVE (Cont.)

17 February (Cont.)

be in safe diving water. We had now to decide whether to at-
tack immediately or wait until they rounded CAPE BATANGAN which
I estimated would be around 2300. I did not believe there would
be an anchor in the vicinity since there were no really good anchor-
ages which afforded any protection. If I attacked now, we would
have to cross about 6 miles of water of 60 feet and less. De-
cided to wait until the convoy rounded CAPE BATANGAN. Unfortu-
nately, the convoy anchored about 2230 about two miles off shore
in the shelter of the Cape in about 40 feet of water. No escorts
appeared to be underway. Two escorts could be plotted in close
to the two big targets in a compact formation. The ships in this
group were within 400-500 yards of each other. Another escort
was anchored about two miles to the south of this group. Running
on the surface to a firing range of the MK 23 high speed torpedo
involved crossing a stretch of some four miles of very shallow
water which varied in depth from 40 to 60 feet. This I did not
consider prudent. I could not understand the action of the con-
voy anchoring in an open roadstead unless the convoy's sea-
ward flank was protected by mines. Since the current appeared to run
about threeknots up to the 20 meter curve, we decided to run the
three Mk fourteen torpedoes at low speed for an 8000 yard run.
Checked all torpedoes and charged air to 2900 psi.

18 February 1945.

0012(H) Battle stations. Commenced surface approach at 1/3 speed to
avoid being detected by escorts' sound gear and thus alerting
the convoy before we fired.
0130(H) Fired 3, #5 and #6 tubes at 10 second intervals with about 1°
left gyro, 150° spread. Range at firing 8460 yards. We fired
at the closest large pip of the cluster which was centrally
located. Turned away at 1/3 engine speed.
0139(H) Heard and felt first explosion at 9 minutes and 10 seconds
after firing first torpedo. 25 seconds later heard and felt
second explosion. 10 seconds later felt third explosion.
0141(H) Felt two heavy rumbling explosions.
0145(H) Lost radar contact on large pip (13,750 yards) at which we had
fired. This had previously been of about same strength as other
large pip at this range. We believe the AK sank at this time.
0146(H) Radar contact on escorts was lost at over 14,000 yards. One
large pip persisted and this was finally lost at
0600(H) when range opened to better than 17,000 yards. Cleared the
area to transmit the contact over Wolf pack frequency and send
message to C.T.F. 71.
0614(H) Unable to contact C.T.F. 71 but gave message to GRIFFIN for re-
lay. Reception was poor and the message was never receipted for.
0621(H) Dived.

- 9 -

— page 174 —
C-O-N-F-I-D-E-N-T-I-A-L
B. NARRATIVE (Cont.)

USS GUITAPRO Fourth War Patrol

18 February (Cont.)

1259(H) Surfaced to try and contact PB4Y search plane on VHF. Unable
     to raise him although we called for one hour.
1835(H) Sighted small ship bearing 320°T about 4 miles. The visibility
     was very poor with a light haze close to the water and a heavy
     rain cloud astern of target. The sun was setting and the light
     failing rapidly. After some maneuvering and tracking, we found
     the target to be much smaller than originally thought.
     Radar observations were difficult to maintain at 8000 yards,
     and its speed was about three knots. So broke off attack and
     decided to return to scene of last evening's crime and see what
     was there.

19 February 1945.

0145(H) Sighted many lights along the beach at CAPE BATANGAN. Finally
     decided this was a train. All hands were in favor of using
     the four inch to work over this train but after checking the
     chart, found the train out of range. Continued south and made
     a careful sweep of the anchorage and beach areas. All clear
     on the radar from 8-10,000 yards.
     Received message from C.T.F. 71 informing us that we would be
     in Wolf Pack with ELO ER in C-3.
0650(H) Exchanged recognition signals with USS ELO ER. ELO ER assigned
     us inshore patrol off TOURANE BAY. ELO ER would patrol seaward
     and endeavor to contact planes.
0840(H) SD plane contact at 20 miles.
1153(H) Sighted plane elevation 1°, 3½ miles. Unidentified but was two
     engine land based bomber, so dived to 120 feet.
1308(H) Surfaced.
1415(H) SD contact at 26 miles.
1421(H) Sighted plane at 10 miles, elevation 3°.
1423(H) Plane looked to be closing so dived. On the way down, the
     navigator identified the plane as a Liberator, so at
     surfaced and tried to contact plane on VHF. No response.
1435(H) Sighted land bearing 265°T. range 20 miles. As visibility
     poor, decided to remain on surface and close beach.
1515(H) Range to CAPE COMMAO 4 miles. Visibility becoming spotty, so
     dived for submerged patrol.
1730(H) Surfaced. Open 1 mile from beach to rendezvous with ELO ER 30
     miles off CAPE TOURANE.
1928(H) Picked up radar interference dead ahead.
2000(H)

20 February 1945.

0300(H) Finally after seven hours of futile effort, we proceeded to
     station off CAPE TOURANE.
0557(H) Dived off CAPE TOURANE for submerged patrol. Visibility good.
1325(H) Sighted masts of three sailboats bearing 228°T, range estimated
     at 12,000 yards.

- 10 -

— page 175 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

5. NARRATIVE (Cont.)

20 February (Cont.)

1410(H) Sighted unidentified aircraft on westerly course range 8 miles,
bearing 246°T.
1425(H) Sighted smoke in TOURANE BAY.
1645(H) Sighted sail boat bearing 070°T, 4 miles.
1928(H) Surfaced. Patrolling off CAPE TOURANE.

21 February 1945.

0621(H) Dived off CAPE TOURANE.
0850(H) Sighted two sail boats bearing 116°T, 5 miles.
0955(H) Sighted two planes bearing 234°T, 8 miles on course 320°T.
1240(H) Sighted sailboat bearing 255°T, 3 miles.
1933(H) Surfaced. Patrolling off CAPE TOURANE.

22 February 1945.

0614(H) Dived off CAPE TOURANE.
1754(H) Sighted masts of sailboat bearing 188°T.
1933(H) Surfaced.
2045(H) Contact on SJ radar at 14,110 yards bearing 249°T.
2047(H) Cut in 3 main engines, all ahead full - closing beach. Unable
to regain contact. Either contact was on the rock off the tip
of the Cape or it was a vessel making better than 16 knots.

23 February 1945.

0405(H) SJ contact at 245°T, 8,250 yards. This we believed to be the
sailboat which we saw frequently in the area and which we sus-
picioned might be engaged in anti-submarine work. He never
bothered us, but he appeared every day. We sighted him again
after daylight in about the same place.
0612(H) Dived off CAPE TOURANE.
0945(H) Sighted our friend the sailboat bearing 222°T, 3½ miles.
1332(H) Sighted aircraft (twin engine bomber - "Nell") bearing 270°T,
12 miles.
1933(H) Surfaced for patrol off CAPE TOURANE. Very bright moonlight -
visibility excellent.
2130(H) SD plane contact at 8 miles closing, so dived. This dive cost
us our grease gun. We had just completed our topside grease
routine and the grease gear was abandoned on the cigarette
deck in the mad shuffle to get below.
2203(H) Surfaced - all clear.
2237(H) SJ contact on USS MURA at 9,900 yards bearing 135°T.

- 11 -

— page 176 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol
B. NARRATIVE (Cont.)

24 February 1945.

0020(H) Made rendezvous with BLOWER for first time since the 19th of Febru-
ary. BLOWER told us to assume off-shore surface patrol 20 miles
north of CULAO RE ISLAND on even days and inshore submerged patrol
off CAPE LATINGAN on odd days - BLOWER would alternate with us.
0511(H) On station 20 miles north of CULAO RE ISLAND.
1018(H) Sighted two floating mines. Endeavored to sink with gun fire.
Efforts unsuccessful.
1330(H) Sighted another floating mine.
1435(H) Sighted masts. Thought this was a sailboat but could not say
definitely what he was. As the object was closing, decided to
dive and look him over.
1445(H) Dived -- race out to be sailboat, so at
1503(H) surfaced. Sailboat opened out from us toward beach.
1539(H) Received message from USS HOE giving posit of north bound tanker
and three escorts about 90 miles off beach heading north. We
could intercept, so we went to four engine speed. Sent USS HOE a
message telling him we expected to intercept convoy about 2200(H).
2020(H) On predicted track of convoy and about 16 miles ahead. Came to
opposite of course as given by HOE and commenced to close the range.
Should pick him up very soon. The moon was almost full and there
was hardly a ripple on the ocean. Any attack tonight must be sub-
merged. Radar interference bearing 110°T. According to our calcu-
lations this interference was too far to the West to be the HOE.
We also picked up radar interference bearing 187°T which we thought
was the HOE since it coincided with our predicted posit.
2030(H) Received a message from the HOE saying convoy had changed course
to 090°T and gave us a new posit. We altered course in the direc-
tion of the radar interference bearing 110°T endeavoring to gain
bearing and thus maintain our position ahead of convoy.
2120(H) HOE sent message saying she was attacking from ahead. Radar in-
terference at 090°T disappeared. Still no contact on the convoy.
2300(H) Radar contact with HOE again. She gave convoy's posit as bearing
255°T, distance 12 miles from her. Convoy speed 10, course 320°T.
So changed course to 270°T to intercept. Evidently HOE had been
thwarted in her attack by a radical zig of target.
2310(H) Sighted two orange balls of flame and heard two distant explo-
sions. These explosions had a true bearing of 235°T which was
somewhat in advance of the convoy's posit.
2352(H) SJ contact bearing 184°T, range 18,700 yards. Radar tracking
party.

25 February 1945.

0040(H) At least one of the escorts had radar which we picked up on the
APR at 156 megacycles. There were three escorts in all, one of
which must have been a DD as he was much easier to see than any
of the other two. Since the convoy had radar decided to track
from 16,000 yards and thus endeavor to keep beyond his radar range.

- 12 -

— page 177 —
C-O-N-F-I-D-E-N-T-I-A-L
USS GUITARRO Fourth War Patrol

B. NARRATIVE (Cont.)
25 February (cont.)

After 45 minutes of tracking we had a good solution. Target was
on steady course 320°T, speed 10 knots. We were 15° on his port
bow and 16,000 yards ahead, so dived and commenced approach.
Went to battle stations. Closing target's track on 010°T.
0054(H) Changed course to 120°T to close range. According to TDC, target
was 140°T, range about 14,000 yards. We were approximately 4000
yards off track.
0100(H) At 45 feet sweeping with radar, no contact so came up to 40 feet.
No contact. We should pick up the target very soon. His gener-
ated range was about 11,000 yards.
0110(H) Changed course to 110°T.
0113(H) Light fast screws bearing 095°T. At 40 feet still no contact on
radar. Could see nothing in periscope although visibility was
excellent.
0135(H) Came to course 070°T. Still no contact on SJ radar.
0200(H) Secured from battle stations. Screws and pinging very weak. De-
cided target must have rigged radically to course 020°T shortly
after we dived. It is possible that the target was taking bear-
ings on our SJ radar and upon seeing interference disappear when
we dived, he changed course. This is evidently what happened.
During her first approach. During our approach we kept getting
HOE's radar interference. We decided that since the relative
bearing of HOE's interference and the sound contact on convoy's
screws were only five degrees apart that the HOE must be con-
ducting a submerged approach, so at
0207(H) Surfaced. Contact on SJ at 18,000 yards bearing 002°T. Came to
course North astern of convoy.
0215(H) Came to course 030°T to open out to starboard of convoy.
0245(H) Heard and sighted a tremendous explosion as the large tanker went
up in a sheet of flame 300 feet high. The HOE had scored a good
hit. A dense pall of smoke then rose from the water and per-
sisted for some time afterwards. Another minor explosion followed
and the radar pip on the tanker disappeared abruptly. The escorts
dropped twenty depth charges and at
0326(H) the escorts headed for home without their tanker. This was quite
an inspiring sight. All hands were disappointed that we had not
been the fortunate submarine, but the HOE certainly deserved the
sinking. She had done an excellent tracking job throughout the
day and night. Her information was accurate and enabled us to
gain contact. The unselfish spirit of the HOE's Commanding Officer
enabled us to commence an approach which might well have snatched
the prize from under his nose.
0432(H) Changed course to 205°T, headed for our area.
0714(H) SD contact at 14 miles. Closed to 8 miles so dived.
1100(H) SD plane contact at 24 miles. Tried to contact on VHF and Voy
Call - no success.
1109(H) Dived.
1220(H) Surfaced.

- 13 -

— page 178 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITAPRO Fourth War Patrol

B. NARRATIVE (Cont.)

25 February (Cont.)

1232(H) SD cont at at 13 miles. Tried to contact on VHF and Voy Call
with no success.
1426(H) Contact with USS BLOWER.
1915(H) Fell in with USS BLOWER. Making sweep to south of CULAO RE,
thence up the coast to north through channel east of CAPE BATANGAN.

26 February 1945.

0230(H) BLOWER departed for diving inshore. Assigned us to off-shore
surface patrol.
0410(H) Sighted mine.
1010(H) Sighted mine.
1107(H) SD contact at 10 miles closing, so dived.
1226(H) Surfaced.
1330(H) Contacted CAVALLA on Voy Call and heard plane on same frequency.
CAVALLA relayed message from plane concerning convoy sighted north
of CAPE BATANGAN. Decided to try and intercept convoy off CAPE
TOURANE.
1520(H) Sighted masts of small boat. Manned 40MM and 20MM guns in case
he was a Jap.
1559(H) Passed sailboat abeam about 150 yards. It was about 50' in length
with two masts and practically covered over with a flimsy straw
matting. The occupants appeared to be of Chinese extraction.
There were women and children in the boat and probably friendly,
so we did not molest them.
2010(H) Patrolling close in to shore off CAPE TOURANE.
2100(H) SJ radar contact at 9000 yards. There appeared to be three ships,
none of which were very large. They had just rounded the southern
tip of CAPE TOURANE. Came to course 320°T - manned radar and gun
stations. Target was tracked at 9.5 knots, zigzagging between
280°T and 320°T. The target had a 100 starboard angle on
320°. We were gaining bearing on four engines. With a little
luck we would get into a good firing, at
2133(H) The target zigged to 270°T and remained on that course until they
disappeared into CAPE TOURANE BAY.
2205(H) We reversed course and endeavored to gain contact again but the
targets never reappeared.

27 February 1945.

0145(H) Exchanged recognition signals with BLOWER. She informed us that
she had encountered strong anti-submarine activity off CAPE
BATANGAN during the previous day. Four escort vessels had
patrolled in vicinity of her. BLOWER assigned us patrol station
off CULAO RE.
1123(H) Contact on SD at 16 miles. Endeavored to contact on VHF and Voy
Call - no success.

- 14 -

— page 179 —
C-O-N-F-I-D-E-N-T-I-A-L
B. NARRATIVE (Cont.)
USS GUITARRO
Fourth War Patrol

27 February (Cont.)

2137(H) Contact on SJ radar at 6300 yards bearing 242°T. Tracked at
about 1.5 knots. Target looked like a sailboat.
2238(H) Sighted a small pin point of light bearing 310°T followed shortly
thereafter by what appeared to be a rocket or flare. This left a
brilliant trail of fire for some seconds close to the water -
dived.
2340(H) Surfaced.

28 February 1945.

0503(H) Closing beach to dive. SJ plane contact at 9 miles - dived.
The night was very bright from a full moon.
0526(H) Surfaced.
0620(H) Dived about 12 miles off coast as dawn was approaching.
0639(H) Light fast screws and pinging by sound bearing 230°T.
0640(H) Sighted outline of two small vessels which appeared to be patrol
boats with zero angle on the bow, range 4000 yards (estimated).
0645(H) Put vessels astern, rigged for silent running. Remained at peri-
scope depth. We now had at least two sets of screws and
of "pingers". Pinging was on 15 Kcs.
0705(H) Daylight now and we could make out a total of 9 sailboats
(6-10,000 yards - two masts - about 75' in length. Nothing else
in sight - pinging continued and screws grew fainter. Finally at
0900(H) All pinging and screws faded out.
1431(H) Surfaced. Closed beach and looked for sailboats. A total of three
boats could be seen through high periscope, close in to beach.
1646(H) Sighted floating mine.
2100(H) Received message from C.T.F. 71 telling us to return to PERTH.

1 March 1945.

0040(H) SJ radar out of commission. We were in a dense fog - visibility
200 yards. Still in area.
0110(H) O.O.D. sighted torpedo wake bearing 050° relative, distance 100
yards, 120 starboard track. Torpedo wake passed 100 yards ahead
of ship. We had strong SJ and SD radar indications on APD. We
endeavored to contact this boat by Voy Call - no success.
0125(H) SJ radar back in commission - SJ interference bearing 075° rela-
tive. After about 45 minutes of constant challenging by us
we finally exchanged recognition signals with a friendly boat.
However, he refused to identify himself although we continued to
call him on SJ radar. The torpedo wake came from the starboard
hand, the same direction as the SJ interference. We could not,
of course, definitely identify the unknown ship as friendly, al-
though every indication points to an attack on us by one of our
own submarines.
1028(H) Plane contact on SJ radar bearing 060°T, range 38000 yards.
Plane closed to 6 miles, so at

- 15 -

— page 180 —
C-O-N-F-I-D-E-N-T-I-A-L
R. NARRATIVE (Cont.)

USS GUITARRO
Fourth War Patrol

1 March (Cont.)
1100(H) Dived.
1126(H) Surfaced.

2 March 1945.
0629(H) SD contact 14 miles, closing.
0646(H) Dived.
0704(H) Surfaced.
1446(H) Dived.
1511(H) Surfaced.

3 March 1945.
0715(H) Dived.
1904(H) Surfaced.

4 March 1945.
0725(H) Sighted periscope bearing 300°T, 6000 yards (estimated). Opened
out to East.
1037(H) Made quick dive about 30 miles to South of periscope. Thought he might
be making a daylight dive and if so, he would surface later.
1736(H) Surfaced.
1741(H) Lookouts sighted what appeared to be a surfaced submarine bearing
280°T, range 14,000 yards (estimated). It was believed that the
submarine was searching with its high periscope at frequent in-
tervals as the presence of a mast was indicated from time to time.
We worked around to south of him and at
1825(H) Dived. Battle stations submerged. We had only about 45 minutes
of light remaining.
1916(H) No contact -- secured from battle stations. If the object was a
submarine, he dived when we dove or changed course radically.
Decided to remain submerged for a while in case our friend was
in the vicinity waiting for us to surface.
1956(H) Surfaced.
2022(H) We were making three engine speed but the vibration from the screw
was so bad that we were forced to secure one engine to avoid possi-
ble serious damage. (See casualty report).

5 March 1945.
0640(H) Dived.
0835(H) Surfaced.
2100(H) Converted #3 and #5 F.B.T. to main ballast tanks.
2153(H) Dived.
2213(H) Surfaced.

- 16 -

— page 181 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol
B. NARRATIVE (Cont.)

6 March 1945.

0635(H) Dived.
0730(H) Surfaced.
1453(H) Dived - Submerged patrol.
2030(H) Surfaced.

7 March 1945.

0630(H) Dived 45 miles west of entrance to KARIMATA STRAIT.
1628(H) Sighted German submarine, 740 ton type, bearing 355°T,
5000 yards (estimated) range.
1630(H) Battle Stations. I had to decide whether to attack the subma-
rine or break off the approach since only CA's and above
ordinarily be attacked in KARIMATA STRAIT. Since he was a
valuable target without escort and as dead men tell no tales,
believed his sinking would be more or less a mystery to the Japs.
Decided that we would make the approach and fire four electrics
at him if we could attain a favorable position and a good set-up
that would assure a hit. We were directly across the entrance
to KARIMATA STRAIT about 10 miles from land in about 100 feet
of water. The day was clear and the sea was calm except for a
slight ripple on the water from a light breeze. Making an ap-
proach would necessarily have to be a cautious one to avoid
detection since small objects loomed up easily to the
eye at ranges of 2-300 yards. We avoided changing speeds and
remained at 40 RPM during the entire approach to prevent
presence of swirls which were quite noticeable in such a flat sea.
1631(H) Sub had a 60° angle on the bow, range about 4000 yards, speed
6 knots (120 RPM by sound). His bearing was 240° relative
giving him a course of 117°T, parallel to our own. We rigged
for silent running at this point because of his slow speed.
1636(H) The target now began the most elaborate submarine evasion plan
that I have ever seen. Speed was increased to 15 knots and 10
minutes later decreased to 11 knots. (This was detected by JP
sound gear from fairly accurate turn counts.) Never once during
observation was his course within 60° of any previous course.
During this period I took frequent looks and his courses went
about as follows: 11°T, 170°T, 340°T, 150°T, 090°T, 180°T,
260°T, 220°T. His closest range was 1400 yards. Finally at
1645(H) The submarine zigged to 280°T and disappeared over the horizon.
We never had any suitable set-up which was reliable enough to
fire with although our tubes were ready and standing by. I do
not believe that he sighted us since I never exposed more than
a few inches of scope at any time and then only for a few seconds.
We concluded afterwards that the submarine had just surfaced and
was taking a cut prior to taking a departure. We were fortunate
that we had not been a victim of his torpedoes since I think it
possible that we dived very close to him early in the morning.
1720(H) Lost sight and sound contact. Secured from battle stations.
1954(H) Surfaced. Transitting straits.

- 17 -

— page 182 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

B. NARRATIVE (Cont.)

8 March 1945.

0605(H) Exchanged recognition signals with U.S.S. SEA ROBIN.
1240(H) Sighted sailboat on horizon bearing 355°T.
1505(H) SD contact 18 miles. Dived.
1604(H) Surfaced.

9 March 1945.

0701(H) Dived.
1837(H) Surfaced.
1930(F) SD contact bearing 210°T. There were four small pips. They
          were on a line of bearing making about 6-8 knots, course 290°
          T about 3000 yards apart. Apparently they were A/S vessels
          making a sweep across the track to LOMBOK STRAIT. Shortly
          afterwards the ships changed course to 160°T and increased
          speed to 13 knots. We worked around ahead of them and in-
          creased the range to about 13,000 yards. The ships continued
          on about 160°T but speed was reduced to 10 knots. We finally
2022(H) lost them astern at
          range 14,000 yards bearing 350°T.

10 March 1945.

0245(H) Commenced transit of LOMBOK STRAIT.
0500(H) Completed transit of LOMBOK.

11 March 1945.

1000(H) Training dive.
1025(H) Surfaced.

12 March 1945.

0135(H) SJ radar interference bearing 027°.
1215(H) Training dive.
1235(H) Surfaced.
1255(H) Fired 5 rounds of 4" ammunition for test and training purposes.
1632(F) Training dive.
1645(H) Surfaced.

13 March 1945.

0230(H) Exchanged recognition signals with USS BOARFISH.
1137(H) Training dive.
1150(H) Surfaced.
1620(H) Sighted submarine by high periscope. Exchanged recognition
          signals with U.S.S. PERCH.
1750(H) Training dive.

- 18 -

— page 183 —
C-O-N-F-I-D-E-N-T-I-A-L
B. NARRATIVE (Cont.)                               USS GUITARRO                                Fourth War Patrol

                                                    13 March (Cont.)

1759(H) Surfaced.
2200(H) Exchanged recognition signals with U.S.S. CROAKER.
2300(H) Exchanged recognition signals with U.S.S. BLUEGILL.

                                                    14 March 1945.

Underway as before.

                                                    15 March 1945.

0630(H) Exchanged recognition signals with ROTTNEST ISLAND proceeding
         into harbor, FREMANTLE, W.A.
0745(H) Commenced sound tests.
0850(H) Secured from sound tests, proceeding into harbor.
0910(H) Moored alongside U.S.S. BURRALE, North Wharf, FREMANTLE, W.A.

                                                    - 19 -

— page 184 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

C. WEATHER

The northeast monsoon prevailed during most of the time in area, but
showed signs of breaking up toward the end of the period. The wind shifted
generally toward the south, but occasionally blowing from the north-
west, bringing some fog and rain. Spells of flat calm occurred on a few
occasions.

D. TIDAL INFORMATION

The northeast monsoon current was very strong all during this patrol,
responding not at all to shifts in wind direction or velocity.

Along the coast from SUFFLE ISLAND to CAPE BATANGAN the current set
parallel to the beach at 2.5 to 3.5 knots out to about 12 miles from the
mainland. At that distance the open sea current began to be felt, setting
about 190 at 1 knot.

From CAPE BATANGAN to CULAO CHAN the currents were erratic because
of the unpredictable effects of the confluence of the coastal current and
open sea current. Between CULAO REI and the mainland the current set
150, up to three knots; close north and south of CULAO REI the set was 180,
up to two knots; east of CULAO REI, the set was 180 to 190 about 1 knot;
while 20 miles north of CULAO REI sets of 140 to 240 were found, at speeds
up to 2 knots.

Off CAPE TOURANE the current was very consistent at 145, 2.5 knots,
slacking at about 1600(H) to 1.5 knots.

E. NAVIGATIONAL AIDS

No navigational lights were observed to be lighted, but the light-
houses on VUNG MOI, CULAO REI, and CAPE TOURANE are clearly visible by
day and make useful landmarks.

This coast along its whole length is provided with small, convenient-
ly distributed islands from one to twenty miles off the beach which are
valuable both as visual and as radar landmarks. There are numerous
hills along the beach itself, so that it is nearly always easy
to get an accurate position.

The coast from CAPE SA HOI to CAPE BATANGAN is very low, and land
contacts which appear on the radar to be along the beach are actually two
to seven miles inland. The actual coastline is not picked up until the
range is about 7,000 yards.

- 20 -

— page 185 —
C-O-N-F-I-D-E-N-T-I-A-L

USS GUITARRO Fourth War Patrol

F. SHIP CONTACTS

No. | Date | Time | Lat. | Long. | Type(s) | Initial Range | Est. Course | Con-tact | Remarks
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
1. | 2/1/45 | 1705(H) | 02-38N | 124-24E | 12 LCT's | 15,000 | 010 | SD | American convoy - Recog.Sig. exchanged
  | | | | | 1 DD | | | |
  | | | | | 2 DE | | | |
  | | | | | 1 AK | | | |
  | | | | | 4 MC | | | |
2. | 2/2/45 | 1343(H) | 02-29N | 125-51E | Sail-boat | 14,000 | 120 | SD | Avoided
3. | 2/2/45 | 1440(H) | 02-29N | 125-51E | Sail-boat | 9,000 | 275 | SD | Avoided
4. | 2/5/45 | 1545(H) | 11-26N | 121-03E | 1 DD | 15,000 | 335 | SD | American
  | | | | | 1 Tanker | | | |
5. | 2/5/45 | 1620(H) | 11-26N | 121-03E | 38 ships | 10,000 | 155 | SD | American
6. | 2/8/45 | 0045(H) | 14-10N | 102-15E | 1 SS | (Radar Interference) | -- | R | Exchanged recog. sigs with USS BASHAW (SS241)
7. | 2/8/45 | 2300(H) | 14-19N | 109-20E | Unk. | 9050 | 075 | R | Not sighted - Unidentified.
8. | 2/10/45 | 0901(H) | 14-19N | 109-29E | 1 AK HIKATA MARU | 27,000 | 170 14 kt | R | Dived after contact. Contact closed to 3000 yards.
9. | 2/13/45 | 1230(H) | 15-40N | 111-05E | Probable (BB) | 24,000 | 000 18 kt | P | Unable to close.
10. | 2/13/45 | 1611(H) | 15-40N | 111-05E | 1 SS | -- | -- | SD | Rendezvoused with USS BERGALL (SS320)
11. | 2/17/45 | 0708(H) | 19-16N | 109-18.5E | Wreck (AK) | -- | -- | P | --
12. | 2/17/45 | 1325(H) | 19-16N | 109-18.5E | 2 escorts 2 tankers | 15,000 | Northerly 10 kt | P | Enemy convoy. End rounded on surface. Sank one AK
13. | 2/18/45 | 1835(H) | 16-24.1N | 108-28E | Sailboat | 8,000 | 135 3 kt | SD | Avoided
14. | 2/20/45 | 1320(H) | 16-14.7N | 108-29E | 3 sail-boats | 4 miles | -- | P | Avoided

- 21 -

— page 187 —
CONFIDENTIAL USS GUITARRO Fourth War Patrol

G. AIRCRAFT CONTACTS
No. | Date | Lat. | Type(s) | Initial | Course | How | Remarks
| Time | Long. | | Range | Speed | contacted |
| (H) | | | | | |
1 | 2/2/45 | 02-50N | Liberator | 20 mi. | Southerly | R | Sighted 10 min after
| 0855 | 127-50E | | | | | contact.
2 | 2/2/45 | 02-29N | PV-1 | 12 mi. | East. | R | Sighted 2 min. after
| 1312 | 125-51E | | | | | radar contact.
3 | 2/3/45 | 03-31N | Unk. | 11 mi. | -- | R | Contact not sighted.
| 0812 | 121-52E | | | | |
4 | 2/3/45 | 03-58.8N | Unk. | 40 mi. | -- | R | Received IFF respon-
| 1155 | 121-01.8E | | | | | se. Closed to 8 mi.
| | | | | | | Not sighted.
5 | 2/3/45 | 03-31.5N | 2 unk. | 24 mi. | -- | R | Contact not sighted.
| 0607 | 121-52E | | | | | Rec. IFF response.
6 | 2/4/45 | 06-04N | 3 unk. | 55,40, | -- | R | Rec. IFF response.
| 0720 | 119-52E | | 10 mi. | | |
7 | 2/4/45 | 06-04N | PBM | 18 mi. | West- | R | Rec. IFF response.
| 0735 | 119-52E | | | erly | |
8 | 2/4/45 | 07-35N | Unk. | 30 mi. | -- | R | Rec. IFF response.
| 1210 | 120-03E | | | | | Not sighted.
9 | 2-5-45 | 11-26N | PBY | 20 mi. | South | R | Sighted 10. mi. Ex-
| 1200 | 121-08E | | | | | changed rec. sigs.
10 | 2/5/45 | 11-50N | PBY | 20 mi. | South | R | Plane escort for
| 1616 | 120-09E | | | | SD | U.S. convoy
11 | 2/5/45 | 11-50N | 5 unk. | 14 mi. | -- | SD | Plane escort for
| 1635 | 120-09E | 1 PBM | | | | U.S. convoy.
12 | 2/6/45 | 12-37N | Unk | 14 mi. | -- | R | Contacted on SJ.Lost
| 0030 | 119-47E | | | | | contact-range open.
13 | 2/6/45 | 12-33N | PBY | 18 mi. | 220 | R | Exchanged Rec.sigs
| 0738 | 117-10.6E | | | | |
14 | 2/6/45 | 12-50N | PBY | 20 mi. | East- | R | Sighted 20 min.after
| 1450 | 116-10E | | | erly | | contact.
15 | 2-7-45 | 14-10N | Unk | 15 mi. | -- | R | Closed to 8 mi. Not
| 1020 | 112-40E | | | | | sighted.
16 | 2/9/45 | 14-18N | 3 Nells | 5 mi. | North- | P | Submerged patrol.
| 1026 | 108-20E | | | erly | |

-23-

— page 188 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

G. AIRCRAFT CONTACTS (Cont.)

No. | Date | Time | Lat. | Long. | Type(s) | Range | Speed | Initial Course | How Contacted | Remarks
---|---
17 | 2/9/45 | 1100(H) | 14-18N | 108-20E | Jake | 4 mi. | --- | North-erly | P | Submerged patrol
18 | 2/9/45 | 1100(H) | 14-18N | 108-20E | Nell | 10 mi. | --- | South-erly | P | Submerged patrol
19 | 2/10/45 | 1210(H) | 14-44N | 109-29E | Bomber type | 10 mi. | --- | North-erly | SD | Dived when sighted.
20 | 2/10/45 | 1535(H) | 14-44N | 109-29E | Unk. | 9 mi. | --- | --- | R | Dived when contact-ed
21 | 2/11/45 | 1114(H) | 15-40N | 110-10E | Unk. | 15 mi. | --- | --- | R | Contacted on SJ radar.
22 | 2/11/45 | 1227(H) | 15-34N | 109-56E | Bomber type | 15 mi. | --- | --- | R | Sighted 1 min. after contact. Dived when closed to 12 mi.
23 | 2/12/45 | 0938(H) | 14-17N | 109-30E | Unk | 5 mi. | --- | --- | R | Dived on contact
24 | 2/12/45 | 1246(H) | 15-40N | 115-05E | Unk. | 14 mi. | --- | --- | R | Dived on contact
25 | 2/13/45 | 1035(H) | 15-40N | 115-05E | Unk. | 16½ mi. | --- | --- | R | Dived when closed to 7 miles.
26 | 2/13/45 | 1112(H) | 15-40N | 115-05E | 2 motor bomber | 7 mi. | --- | North-erly | R | Plane closed to 5 miles. Dived.
27 | 2/13/45 | 1145(H) | 15-40N | 115-05E | 2 motor bomber | 7 mi. | --- | --- | R | Plane closed to 5 miles. Dived.
28 | 2/13/45 | 1320(H) | 15-40N | 111-05E | Mavis | 3 mi. | --- | North-erly | P | Submerged patrol
29 | 2/13/45 | 1340(H) | 15-40N | 111-05E | Unk. | 9 mi. | --- | --- | R | Contacted upon sur-facing. Dived Immed.
30 | 2/13/45 | 1425(H) | 15-40N | 111-05E | Emil | 7 mi. | --- | --- | SD | Dived on contact
31 | 2/13/45 | 1542(H) | 15-40N | 115-05E | Unk. | 10 mi. | --- | --- | R | Closed to 7 mi. IFF response received.
32 | 2/13/45 | 2024(H) | 16-20N | 111-05E | Unk | 14 mi. | --- | --- | R | Received IFF respon-se.

- 24 -

— page 189 —
C-O-N-F-I-D-E-N-T-I-A-L
G. AIRCRAFT CONTACTS (Cont.)
USS GUITARRO
Fourth War Patrol

No. | Date | Time (H) | Lat. | Long. | Type(s) | Initial Range | Course | Speed | How Contacted | Remarks
--- | ---
33 | 2/14/45 | 0851(H) | 16-30N | 109-53E | Unk. | 7 mi. | -- | -- | R | Dived on contact.
34 | 2/14/45 | 1130(H) | 16-10N | 109-30E | Unk. | 10 mi. | -- | -- | R | Rec. IFF response.
35 | 2/15/45 | 1409(H) | 14-10N | 109-30E | Emily | 3 mi. | South- | erly | P | Submerged patrol.
36 | 2/15/45 | 1500(H) | 14-10N | 109-30E | 2 Zekes | 1 Kate | 5 mi. | South- | erly | P | Submerged patrol.
37 | 2/16/45 | 1403(H) | 14-04N | 109-24E | Thelma | 8 mi. | North- | erly | P | Submerged patrol.
38 | 2/17/45 | 0949(H) | 14-20N | 109-20E | Betty | 3 mi. | South | -- | P | Submerged patrol.
39 | 2/17/45 | 1200(H) | 14-16N | 109-18E | Rufe | 10 mi. | South | -- | P | Submerged patrol.
40 | 2/17/45 | 1500(H) | 14-16N | 109-18E | Unk. | 7 mi. | S. West- | erly | P | Submerged patrol.
41 | 2/17/45 | 1600(H) | 14-20N | 109-18E | Unk. | -- | -- | -- | SD | Probably air escort | for empty convoy.
42 | 2/19/45 | 0837(H) | 15-37N | 109-22E | Unk. | 20 mi. | -- | -- | SD | Closed to 10 mi. | Range opening.
43 | 2/19/45 | 1145(H) | 15-37N | 109-22E | Bomber | type | 4 mi. | North- | erly | SD | Dived on contact.
44 | 2/20/45 | 1300(H) | 16-47.7N | 108-38.6E | Unk. | 8 mi. | West | -- | P | Submerged patrol.
45 | 2/23/45 | 0955(H) | 16-07N | 108-30E | Bomber | type | 8 mi. | N.West- | erly | P | Submerged patrol.
46 | 2/23/45 | 1330(H) | 16-17.1N | 108-27.7E | Bomber | type | 12 mi. | West | -- | P | Submerged patrol.
47 | 2/23/45 | 2130(H) | 16-20N | 108-20E | Unk. | 8 mi. | -- | -- | R | Dived on contact.
48 | 2/24/45 | 1210(H) | 15-40N | 108-20E | Bomber | type | 12 mi. | -- | -- | R | Lost sight of con- | tact. Range opening.

- 25 -

— page 190 —
USS GUITARRO Fourth War Patrol

G. ABNORMAL CONTACTS (Cont.)

| No. | Date | Time | Lat. | Long. | Time(s) | Initial Range | Course | Speed | Contacted | Remarks |
|---|
| 49 | 2/25/45 | 1107(H) | 16-05N | 109-44E | Unk. | 20 mi. | --- | --- | R | Dived when closed to 9 miles. |
| 50 | 2/27/45 | 1113(H) | 15-22N | 109-24E | Unk. | 15 mi. | North | --- | R | Sighted after contact. Opening. |
| 51 | 2/27/45 | 2005(H) | 15-26N | 109-19E | Unk. | 15 mi. | --- | --- | R | Lost contact 2 min. later. |
| 52 | 2/28/45 | 0503(H) | 15-41N | 108-20E | Unk. | 19 mi. | --- | --- | R | Dived when closed to 9 mi. |
| 53 | 3/1/45 | 1028(H) | 12-50N | 110-30E | Unk. | 20 mi. | --- | --- | R | Dived when closed to 9 miles. |
| 54 | 3/8/45 | 1500(H) | 04-07S | 111-52E | Unk. | 18 mi. | --- | --- | R | Dived on contact. |

H. ATTACK DATA

See pages 27 and 28.

I. MINES

Many floating mines were encountered in the northern part of area C-2
to the north and east of O'LAO RE ISLAND. We endeavored to destroy one by
gun fire but were unsuccessful. The mines were the conventional type
spherical in shape with the protruding contact horns.

J. ANTI-SUBMARINE MEASURES AND EVASION TACTICS

Anti-submarine measures were for the most part true to form. In the
northern part of C-2, particularly off CAPE TOURANE and CAPE BATAN, numer-
ous sailboats were encountered within 8 to 10 miles of the beach. These
boats were not seen to be going anywhere and were not engaged in fishing.
Often times we encountered them singly at night.

In the early morning of 28 February, screws and pinging were heard on
all sound gear. They day began to dawn, two ships whose hulls
resembled two boats were observed at about 4000 yards. Later, as the mist
lifted and good visibility obtained, we made out a total of nine two-masted
sailing junks of estimated 75' length. The pinging and screws continued
and emanated from the same bearing as two of these vessels. We put to
western and opened out. At about 6000 yards we could make out no
details such as bridge structure behind the sails. The pinging died as the
boats drew away and changed bearing corresponding to their relative
position. For this reason, it is believed these noises were not fish noises.

— page 191 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

H. ATTACK DATA
U.S.S. GUITARRO TORPEDO ATTACK NO. 1 PATROL NO. 4
Time 0128(H) Date 17 Feb. 1945 Lat. 15-12N Long. 108-54E

Target Data - Damage Inflicted

Description Convoy consisted of 1 large AK (EC) similar to HOKUMEI MARU
             Page 214, ONI 208-J, Revised, one medium AO (EU), 2
             escorts, one DD. Sighted ships earlier in day through peri-
             scope. Was able to ascertain the formation and types of
             ships - ships also had air cover.

Ship(s) Sunk One large AK (EC) similar to HOKUMEI MARU, Page 214, ONI
             208-J, Revised.

Ship(s) Dam-
aged or
Probably Sunk

Damage Deter- Three timed hits - two loud rumbling explosions 3 and 5
mined by     minutes after initial hits. One large pip disappeared
             from radar screen at 13,000 yards while escorts and other
             large pip remained strong and constant at 17,000 yards.

Target Draft 24' Course Anchored Speed 0 Range 8500 (at firing)

Own Ship Data

Speed 9.8 Course 290 Depth Surface Angle 0 (at firing)

Fire Control and Torpedo Data

Type Attack:- Night surface attack on anchored convoy inside 20 meter
             curve. Ships were anchored 4 miles off shore. The AO, AK,
             and 2 escorts anchored in a very compact formation with the two large ships
             slightly overlapping. The ranges were within 300 yards of each other. One
             escort, thought to be the DD, anchored about 3 miles to the south of the
             group as if to picket the southern flank. The target was tracked on 340°T
             not indicating a current setting 130°T, ½ knot. 3 Mk 14-3A torpedoes
             were fired in low speed with an 8500 yard run to cover 150% of targets
             length. 1st hit - 9m 10s; 2nd hit - 9m 35s; 3rd hit - 9m 45s. At 12m,
             first muffled explosion - 14m, second muffled explosion.

- 27 -

— page 192 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

H. ATTACK DATA (Cont.)

Tubes Fired -                                 2          5          6
Track Angle -                             Unknown    Unknown    Unknown
Gyro Angle -                              1°L        1°L        1°L
Depth Set -                               6 ft.      6 ft.      6 ft.
Power -                                   Low        Low        Low
Hit or Miss -                             Hit        Hit        Hit
Erratic
(Yes or no) -                             No         No         No
Mark Torpedo -                            14-3A      14-3A      14-3A
Serial No. -                              40393      63590      63552
Mark Exploder -                           6-5        6-5        6-5
Serial No. -                              19622      25238      2920
Actuation Set -                           Impact     Impact     Impact
Actuation Actual -                        Impact     Impact     Impact
Mark Warhead -                            16-1       16-1       16-1
Serial No. -                              14773      17698      17378
Explosive -                               Torpex     Torpex     Torpex

Firing Interval - 10 seconds
Type Spread - Divergent
Sea Conditions - Calm
Overhaul Activity - Submarine Repair Unit, Navy 137.

- 23 -

— page 193 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

J. ANTI-SUBMARINE MEASURES AND EVASION TACTICS (Cont.)

Three night plane contacts were made during the time when the moon was
bright. One of these contacts was off CAPE TOURANE, one north of CULO RE,
and the third was off CAPE PADIRAN just at daybreak. Japanese radar inter-
ference on the APR on the night of 1 March was also thought to be airborne.

K. MAJOR DEFECTS

1. Main Engines

On 1 February, salt water was found in #4 M.E. sump. Inspection
revealed that #4, #7 and #8 units were leaking and that the lower liner
seal rings were badly mutilated, showing evidence of improper installation.
The liner seal rings on these units were renewed. Our experience has
indicated that these seal rings should be coated with Murphy's Oil Soap
before putting them on the liner, and the liner should be turned as it is
being lowered in place. This will prevent binding and rolling of the seal
ring, and increase the life of the seal ring in operation.

On 4 February the two inboard cylinder head studs on #10 unit of #4
M.E. broke off flush with the block. Around the inboard after stud a cir-
cle of metal about 2 inches in diameter and about 1/8 inch deep broke away
from the block. The failure appeared to be due to fatigue of the block
around the tapped stud hole. The broken studs were removed and re-tapped,
and the unit reassembled without attempting repair of the block. No
further trouble was encountered.

On 2 March #3 M.E. muffler commenced leaking and emitting sparks.
Inspection revealed that the elbow joining the exhaust valve and muffler
had blown through. A canvas corset was lashed over the hole, but proved
ineffective in stopping the night fireworks. In succeeding days #2, #4
and #1 mufflers blew through. The leak in #1 and #4 engines was due to
aft cracks on top of the muffler water jackets, while on #2
the holes appeared on the after end of the muffler around the vent sheet.
The holes in #3 M.E. exhaust elbow were finally patched with
copper, asbestos and canvas. All mufflers, elbows and tail pipes should
be renewed next refit.

2. Mark VII Mod 4 Arme Gyro Compass

On 1 February, following a complete compass overhaul by the ten-
der one week previous, the master compass had to be stopped due to vibra-
tion of the south rotor. The rotor was dismantled and one of the rotor
bearings (M.R.C. 200 R4) was found badly pitted and scored. The bad bear-
ing was renewed; but both rotor bearings could not be replaced, since one
of the two spare bearings was badly corroded. This spare bearing had never
been removed from its waterproof wrapping prior to this inspection, so it
had apparently been sealed with moisture on it. The chips were flushed
from the rotor and casing with alcohol, and the unit reassembled with new
gaskets, oil wicks, and oil. Three heat runs were made, but the vacuum
could not be maintained. The rotor was removed again and the oil and vacuum
gage were changed. Two more heat runs were made with no success. The

- 29 -

— page 194 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

MAJOR DEFECTS (Cont.)

2. Main Gyro
vacuum after a few hours would drop to 24 inches, and the rotor unit
still vibrate to some extent. A canvas sleeve was installed from an air supply duct
to provide cooling air. After ten days endeavors with no
success, it was decided to use the compass as a fire control instrument only.
The compass was found to be in error from 1° to 20° from the auxiliary
compass. The vacuum finally leveled off at 13 inches, but the rotor current
only dropped a few amps. In view of the fact that this vessel has
never had a run without a gyro compass casualty, it is strongly recom-
mended that a complete new gyro be installed at the first opportunity.

3. Main Reduction Gears
The condition of the gears became aggravated instead of improved
this patrol. The operating temperatures of the port gear have risen, and
the noise is slow, it indicates that something should be done in the
near future to correct the trouble. The gear is much noisier submerged,
and it can be heard over our #1 sound gear while we are making 40 turns
This condition is a source of worry to all hands, as shallow operating
areas and noisy machinery during silent running do not complement each
other.

4. Hull Vibration
Our starboard screw was inspected by divers at MIOS WOENDI and
found to have one damaged blade. During the second phase of this patrol,
the vibration in the ship became increasingly bad. At speeds between 14
and 18 knots the ship shudders convulsively making a high periscope watch
useless. The frequency of the vibration compares very closely to the num-
ber of shaft turns at the time. Since the magnitude of the vibration has
steadily increased it is felt that the strut and stern tube bearings on
the starboard shaft are absorbing high punishment, and the cycle is pro-
gressive. Some vibration can be noted at slow speeds submerged, so the
condition actually embraces our entire range of speeds.

L. RADIO

Bakers
From 4 February to 7 February signals received from VIXO were extreme-
ly poor. The dots and dashes were run together, making copying almost impossible. Mistakes during period listed
above were due to this condition. Frequencies used for Baker traffic were
4370, 9250, 12030, 15150 kc. No jamming on 4370 or 15150 kcs. Jamming from enemy
stations at the time we were able to copy VIXO on our two usable frequencies, and con-
siderable drift of frequency was noted.
Attempts to contact VIXO on the 4235 series were unsuccessful. All
traffic transmitted by this vessel was relayed either to VHAL or Z4N.

Wolf Pack Communications
This vessel has found the wolf pack communication system effective.
A local condition existing aboard this vessel would not permit the Wolf
Pack frequency to be used when the SJ radar was in operation, because of
extremely high interference and noise level which blocked out all but the
strongest signals.

- 30 -

— page 195 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

L. RADIO (Cont.)

     VHF

          As yet we have been unable to communicate directly with any allied planes
     in patrol areas. Our equipment has been checked over thoroughly and thought
     to be in good repair. We were able on occasion to hear one or two boats com-
     municating with the plane on the Wolf Pack frequency and were thus enabled
     to obtain information through other boats. The VHF was never successfully
     used. No trouble was experienced with the VHF but our inability to contact
     friendly planes on the B and D bands might be due to weak transmitter
     crystals. No test of the unit was made by the U.S.S. GRIFFIN due to lack
     of test equipment.

M. RADAR

     SJ-1

          Due to low visibility conditions which existed throughout the lat-
     ter part of the patrol, the SJ-1 was operated on an average of twenty
     hours a day. During daylight hours it was used primarily to detect low
     flying aircraft and the antenna was rotated at an approximate 6 RPM,
     and proved to be quite effective since over two score planes were
     detected by the unit. During darkness the speed of rotation was reduced
     to 3 RPM in order to increase the effective range of the search beam.

          Our continual source of worry, the motor generator, went out of
     commission enroute to the area. A check of the trouble found the key
     way on the alternator shaft badly chewed up, the key broken and the
     coupling to the motor driver worn out of round. Repairs were effected
     by machining a new keyway and key, and shimming the coupling to fit.
     The unit operated satisfactorily for three weeks and became faulty
     again. In this case, the commutator on the alternator were found
     badly burned and the brushes broken. It is our fervent hope that a
     new SJ motor generator will be installed during this refit.

          The startling fact that a new tube is not often a good tube was
     indicated as it has been on many other occasions. Most notable of these
     was the installation of an apparently new 706AY Western Electric magne-
     tron, which was no better than the faulty one. However, another new one operated
     satisfactorily. Other tubes necessary to check before using were the 6SN7,
     6AG7 and 6AC7 tubes. It seems a good policy and one now effected on this
     ship, to keep in reserve a complete set of tubes, which have proved satis-
     factory by actual operation.

          During the latter part of the patrol, the RAL receivers, especially
     when set on 2006 kcs, picked up a heavy interference when the SJ trans-
     mitter was operated. This seemed to arise from an intermittent ground
     in the high voltage circuit and made it difficult to hear any signals
     over the receiver. A check of the H.V. rectifier supply found
     no faults, but a more thorough inspection will be desired during the
     coming refit to determine and remedy this defect.

- 31 -

— page 196 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

1. RADAR (Cont.)

    Another major defect is the antenna torque tube. This tube is .009
    inch out of alignment and makes training of the antenna erratic at slow
    speeds.

    The occurance of a target pip on reciprocal bearings and at the same
    range when tracking a target close to the bow was noted with either of
    the periscopes or the SD mast raised. This should be borne in mind during
    radar attacks since the reflected echo off any of the above offending
    units is almost as strong as the real one and may lead one to believe
    there would be a target astern.

    SD-1

    This radar proved to be the old standby during this patrol and only
    rarely let us down. It detected planes on all bearings at exceptionally
    good ranges and at elevations below 5°. This combination of using the SJ
    in high speed antenna rotation and the SD keyed 5 out of every 30 seconds
    proved very effective when tracking an air escorted convoy and detected
    the planes long before they were sighted.

    The SD needed no repairs and outside of tuning the local oscillator
    in the receiver daily with the OAO wavemeter, and an occasional adjustment
    of the R.F. coils, it continually operated trouble free.

    The policy of operating the SD when diving for a detected plane until
    a depth of 40 feet was reached proved successful since we were able to
    note any change of range after we almost completely submerged, thus giving us an
    indication of whether or not we had been sighted.

    AFR/ANA/SPA

    Two definite Japanese radars were detected by the AFR during the lat-
    ter part of the patrol. The first, a 156 Mc surface search unit came ap-
    parently from a DD and the second, a 150 Mc air surface search radar, was
    airborne.

    During the almost tragic night of 1 March, when the SJ was out of
    commission for a short time to replace two defective tubes, a torpedo
    very narrowly missed the ship. Just prior to this occurance, two distinct
    radar signals of E-3 strength were received at 248 Mc (a harmonic of our
    SJ) with 100 P/S and 118 Mc with approximately 60 P/S (characteristic
    respectively). The sober fact that our submarines rely completely
    on SJ interference for identification makes it imperative to have some
    other means of recognition in enemy territory, when repairs are being ef-
    fected to the Sugar Jig. Since the SD is very characteristic of our
    boats, why not have an operator check closely for its signal before firing tor-
    pedoes at an unidentified vessel? A keyed signal from the SD can easily
    be detected on the search receiver and could in an emergency be used as an
    alternate means of radar identification.

    - 32 -

— page 197 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

M. RADAR (Cont.)

IFF

The BN and 13EK both operated satisfactorily and proved quite val-
uable enroute to the area from MIOS WOENJI, due to the large number of
allied planes encountered. No material defects were experienced and BN
responses were obtained out to a range of 60 miles and often many minutes
before actual SD contact.

N. SOUND GEAR AND SOUND CONDITIONS

Choppy seas tended to make sound conditions generally bad in the patrol
area. However, when calm weather prevailed the ranges increased remark-
ably. This was most noticeable on two separate occasions. The first, when escort-
ing a convoy in company with the USS HOE, the JP-1 picked up the screws of
the escorting DD at 17,000 yards. On the second instance, the same sound
gear noticed propeller beats of one of the DD's escorting two battle-
ships at approximately 25,000 yards. Otherwise the maximum range was 8000
yards.

The JP-1 continued to prove the value of sonic listening gear by con-
tinually detecting screws before the supersonic units. However, it was
easier to pick up pinging on the JK or QB than on the JP-1.

The JK and QB operated satisfactorily without any material defects,
and performed their duty in an efficient manner. However, two noticeable
defects, to wit: the noisy JK training gear and the jerky bearing indicator
syn in the receiver, will have to be repaired during the coming refit.

SOUND GEAR LISTENING RANGES

| Sound Contact No. | 1. | 2. | 3. | 4. | 5. | 6. |
|---|---|---|---|---|---|---|
| Date | 2/10/45 | 2/12/45 | 2/17/45 | 2/25/45 | 2/28/45 | 3/1/45 |
| Time (zone) | 2000(H) | 0215(H) | 0221(H) | 0041(H) | 0639(H) | 0600(H) |
| Water Depth (fathoms) | 200 | 200 | 50 | 100 | 30 | 30 |
| S Latitude | 14°N | 14°N | 14°20'N | 14°N | 14°N | 14°N |
| Longitude | 108°E | 108°E | 108°30'E | 110°E | 108°E | 108°E |
| U Course | 010 | 090 | 345 | 345 | 195 | 195 |
| Speed | 3 | 3 | 3 | 3 | 3 | 3 |
| B Keel Depth | 70 | 60 | 60 | 60 | 64 | 64 |
| TA Type Target | AH | DD | AO | DD | PC | PC |
| RG Range | 12,000 | 1,500 | 10,000 | 1,500 | 150 | 150 |
| ET Speed (Est.) | 4 | 17 | 9 | 14 | 6 | 6 |
| Turn Count (RPM) | --- | 200 | 110 | --- | --- | --- |
| Type Sound Equipment | JP-1 | JP-1 | JP-1 | JP-1 | JP-1 | JP-1 |
| in use by S/M | JK | JK | JK | JK | JK | JK |
| | QB | QB | QB | QB | QB | QB |

- 33 -

— page 198 —
CONFIDENTIAL USS GUITARRO Fourth War Patrol

N. SOUND GEAR AND SOUND CONDITIONS (Cont.)

| Sound Contact No. | 1. | 2. | 3. | 4. | 5. |
|---|---|---|---|---|---|
| What Did Sound Gear Pick up? | Screws | Screws | Screws | Pinging | Pinging |
| In Frequency Band (Kcs)? | 16 | 16 | 16 | 16 | 16 |
| Initial Range (Yds) | 3,500 | 25,000 | 8,000 | 18,000 | 2,000 |
| Maximum Range Contact Held (Yds) | 3,500 | 30,000 | 16,000 | 20,000 | 5,000 |
| Time Contact Lost | 1030(H) | 1348(H) | 1415(H) | 0200(H) | 0733(H) |
| Range Contact Lost (Yds) | 4,000 | 30,000 | 16,000 | 20,000 | 5,000 |

O. DENSITY LAYERS

No data of any value was taken as we operated in mostly shallow water.

P. HEALTH, FOOD, AND HABITABILITY

The health of the officers and crew was good. No cases of serious
illness were experienced.

Excellent food was prepared by the Commissary Department during the
second phase of the patrol. The U.S.S. GRIFFIN gave us some good pro-
visions and a Commissary Steward to go with them.

Q. PERSONNEL

The performance of the officers and men was in keeping with the high-
est traditions of the Naval service. The performance of the lookouts was
outstanding. A training routine was carried on continuously with particu-
lar attention to qualification, fire control and ship control.

(a) Number of men on board during patrol 75
(b) Number of men qualified at start of patrol 58
(c) Number of men qualified at end of patrol 66
(d) Number of unqualified men making first patrol 9
(e) Number of men advanced in rating during patrol 15

R. MILES STEAMED - FUEL USED (Second Phase)

| From Moendi to Area | 1994 miles | 21,905 gals. |
| In Area | 3830 miles | 64,228 gals. |
| Area to Fremantle | 1450 miles | 18,970 gals. |
| TOTAL FOR 2nd PHASE | 10,274 miles | 105,103 gals. |
| TOTAL FOR 1st PHASE | 7,299 miles | 74,080 gals. |
| TOTAL FOR PATROL | 17,573 miles | 179,183 gals. |

- 34 -

— page 199 —
C-O-N-F-I-D-E-N-T-I-A-L USS CHUBARRO Fourth War Patrol

S. DURATION

| | 1st Phase | 2nd Phase |
| :| :| :|
| Days enroute to area | 7 | 7 |
| Days in area | 25 | 33 |
| Days enroute to base | 6 | 5 |
| Days submerged | 19 | 12 |
| | --- | --- |
| | 32 | 45 | 87 |
| | | Repairs at Mios Moendi | 12 |
| | | GRAND TOTAL - - - - | 99 |

T. FACTORS OF ENDURANCE REMAINING

| Torpedoes | Fuel | Provisions | Personnel |
| :| :| :| :|
| 21 | 12,000 gals. | 30 days | 10 days |

Limiting factor this patrol - Terminated by OpOrder.

U. REMARKS

None.

V. RADIO AND RADAR COUNTERMEASURES

See pages 36, 37, and 38.

- 35 -

— page 200 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol

V. RADIO AND RADAR COUNTERMEASURES

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or station [HANDWRITTEN: U.S.S. GUITARRO (SS363)]

2. Area covered on this mission (give dates) [HANDWRITTEN: 14°N latitude, 109°E long-]
   [HANDWRITTEN: itude February 1 - February 28, 1945.]

3. Was enemy radar:
   Shipborne [HANDWRITTEN: X] Airborne [HANDWRITTEN: X] Landbased [HANDWRITTEN: Unknown]
   (a) Describe enemy installation [HANDWRITTEN: Unknown]

4. Intercept Equipment [HANDWRITTEN: AN/APR-1]

5. (a) Frequency [HANDWRITTEN: 150 Mc] Dial Readings [HANDWRITTEN: 150]
   (b) PRF [HANDWRITTEN: 1000 - 1100 P/S] How measured [HANDWRITTEN: Pulse meter]
   (c) Pulse Width [HANDWRITTEN: 2 micro seconds] How measured [HANDWRITTEN: Calibrated scope]
   (d) Sketch pulse [HANDWRITTEN: (drawing of a pulse)]

   (f) Polarization of enemy signal [HANDWRITTEN: Horizontal]
   (g) Sweep Rate [HANDWRITTEN: Constant]

6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI
   [HANDWRITTEN: Surface search]
   (b) Evidence for this conclusion [HANDWRITTEN: Came from night patrol plane]

7. Action of enemy radar, including distances and bearings at which he
   searched, tracked, faded, etc. [HANDWRITTEN: Fading effect due to a possible]
   [HANDWRITTEN: circling search flight.]

8. Narrative:
   This radar was detected on two different occasions. The first time
   in area [HANDWRITTEN: 14°N latitude and 109°E longitude], the plane seemed to be
   searching for submarines since a radar contact was obtained with the
   SD at 8 miles.
   On the second occasion, the plane radar was detected in an
   area [HANDWRITTEN: 12°N latitude, and 110°E longitude] and although an [UNCLEAR: T-5] strength signal
   was obtained, there was no actual radar contact with the SD or
   SJ.
   This plane may have been on a flight from BORNEO to SINGAPORE.

- 36 -

— page 201 —
C-O-N-F-I-D-E-N-T-I-A-L USS GUITARRO Fourth War Patrol
V. RADIO AND RADAR COUNTERMEASURES

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or station [HANDWRITTEN: U.S.S. GUITARRO (SS363)]
2. Area covered on this mission (give dates) [HANDWRITTEN: 14°N latitude, 109°E longi-]
   tude. [HANDWRITTEN: February 1 - February 28, 1945.]
3. Was enemy radar:
   Shipborne [HANDWRITTEN: X] Airborne Landbased Unknown
   (a) Describe enemy installation [HANDWRITTEN: Unable to view it]
4. Intercept Equipment [HANDWRITTEN: APP-1/ANA/SPA]
5. (a) Frequency [HANDWRITTEN: 156 Mcs] Dial Readings [HANDWRITTEN: 156]
   (b) PRF [HANDWRITTEN: 500 P/S] How measured [HANDWRITTEN: Pulse meter]
   (c) Pulse width [HANDWRITTEN: 4 micro sec.] How measured [HANDWRITTEN: Calibrated scope]
   (d) Sketch pulse
   [HANDWRITTEN: (drawing of a pulse shape, like a bell curve with a flat top)]
   (f) Polarization of enemy signal [HANDWRITTEN: Horizontal]
   (g) Sweep Rate [HANDWRITTEN: 2 - 4 R.P.M.]
6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI
   [HANDWRITTEN: Surface search]
   (b) Evidence for this conclusion [HANDWRITTEN: Came from Japanese DD escorting]
   [HANDWRITTEN: convoy]
7. Action of enemy radar, including distances and bearings at which he
   searched, tracked, faded, etc. [HANDWRITTEN: E-5 signal at 19,000 yards.]
8. Narrative:
   This radar came presumably from one of their escorts which included
   two DE's and one DD which convoyed a large tanker on a bright moon-
   light. No estimate of the maximum range it would detect a U.S. subma-
   rine was obtained, since a submerged approach was made from 16,000
   due to the excellent visibility. Swinging the ship to obtain the beam's
   to the excellent visibility. Swinging the ship to obtain the beam's
   best bearing gave a rough indication over a span of thirty degrees from
   the actual bearing. The operator seemed to be keying the unit at in-
   tervals of 10 seconds to a minute.

- 37 -

— page 202 —
bwl
SUBMARINE SQUADRON EIGHTEEN

FC5-18/A16-3
Serial 0225
Care of Fleet Post Office,
San Francisco, California.
March 15 1945.

C-O-N-F-I-D-E-N-T-I-A-L

FIRST ENDORSEMENT to
U.S.S. GUITARRO (SS363)
Report of Fourth War Patrol.

From: The Commander Submarine Squadron EIGHTEEN.
To: The Commander-in-Chief, UNITED STATES FLEET.
Via: (1) The Commander Submarines, SEVENTH FLEET.
     (2) The Commander SEVENTH FLEET.
Subject: U.S.S. GUITARRO (SS363)-Report of Fourth War Patrol.

1. The fourth patrol of the GUITARRO was of ninety-five (95) days
duration, including a fourteen day stop alongside the U.S.S. GRIFFIN at an
advance base for repairs. The first phase of the patrol was conducted off
the coast of Indo China, working in conjunction with the U.S.S. GURNARD.
During this period contact was made while submerged with an enemy heavy
cruiser. Unfortunately, due to poor visibility and radical maneuvers of
the cruiser and escorting destroyers, no attack was made. Six days later,
during a routine submerged patrol the stern planes jammed on hard rise,
necessitating withdrawal from patrol to effect repairs.

2. The second phase of the patrol commenced on 30 January 1945,
and was also conducted off the coast of Indo China, this time working in
conjunction with U.S.S. PERGALL. One attack was made during this period.

3. Attack #1 on 18 February 1945, was a night surface attack on
a convoy at anchor in an open roadstead off Cape Batangan. The convoy had
been contacted the previous evening and tracked to the anchorage. Due to
the depth of water and possible mine fields the commanding officer decided
to fire low power shots. Three Mark 14 torpedoes were fired at a range of
8460 yards using the closest large pip on the radar screen as point of aim.
Three explosions were heard commencing at nine minutes and 15 seconds after
firing corresponding to a torpedo run of 11,100 yards, indicating end of
run explosions or hits on other ships or on the beach.

4. During this second phase an enemy battleship was sighted on
13 February 1945, while submerged for a plane contact. Upon surfacing,
contact could not be regained on the battleship. On the evening of 23-24
February 1945, contact was made with a tanker and escorts. The U.S.S. HOE
which also had contact made an attack which was successful on either a
DD escort or on the tanker. Another convoy was contacted on 26 February
1945, but it got inside Tourane Bay before GUITARRO could get into attack

-1-

— page 204 —
FE24-71/A16-3
UNITED STATES NAVY
14/le
21 March 1945

Serial 0567
[STAMP: CONFIDENTIAL]

SECOND ENDORSEMENT to:
CO Conf. Ltr.
116-3 Serial 01 dated
15 March 1945. Report
of Fourth War Patrol.

From: The Commander Submarines, SEVENTH FLEET.
To: The Commander in Chief, UNITED STATES FLEET.
Via: The Commander, SEVENTH FLEET.

Subject: U.S.S. GUITARRO (SS363) - Report of Fourth War
Patrol - Comment on.

1. The Fourth War Patrol of the GUITARRO, under the com-
mand of Commander T. B. DABNEY, U.S.N., consisted of two phases, in-
terrupted by the necessity of returning to MIOS WOENDI for stern plane
repairs. During both phases the GUITARRO patrolled off the coast of
INDO-CHINA.

2. The first phase commenced on 11 December, and terminated
on 3 January when her stern planes suddenly jammed on 25° rise during
submerged operations. Upon examination it was discovered that the damage
was beyond the capacity of ship's force, and a very difficult and
hazardous passage to MIOS WOENDI was commenced. On 16 January GUITARRO
arrived safely alongside the Tender.

3. The second phase began on 30 January. On 8 February
GUITARRO again arrived on the INDO-CHINA Coast and continued her in-
shore patrol. On 13 February at 1250(H) GUITARRO sighted a Task
Force consisting of BB's, CA's and DD's, but was unable to close for
attack although GUITARRO joined BERGALL in a determined chase, no
further contact was made. On 17 February a convoy was observed to
pass along the coast in water too shallow for GUITARRO to close and
attack. That night a long range attack, torpedo run 8,000 yards, was
made on the convoy after it had anchored, and it is believed that one
ship was hit and damaged.

4. On 1 March, at 0110(F) the O.C.D. sighted a single tor-
pedo wake, bearing 050° relative, which passed about one hundred (100)
yards ahead. At this time GUITARRO reports being in a dense fog,
visibility two hundred (200) yards. The SJ had been out of commission
for fifteen minutes at the time, but there were strong SJ and SD radar
indications on the APR. At 0125, fifteen minutes later, the SD radar
was back in commission, and recognition signals were exchanged with
an unknown and unidentified unit. Efforts to establish identity were
unsuccessful.

- 1 -
[STAMP: 4 03293]

— page 205 —
The following text is transcribed from the image:

FE24-71/A16-3 UNITED STATES NAVY 14/pr
Serial 0567 21 March 1945
[HANDWRITTEN: C O N F I D E N T I A L]

SECOND ENDORSEMENT to:
USS GUITARRO Conf Ltr.
A16-3 Serial 01 dated
15 March 1945. Report
of Fourth War Patrol.

Subject: U.S.S. GUITARRO (SS363) - Report of Fourth War
Patrol - Comment on.

— page 206 —
FE24-71/A16-3
Serial 0567
CONFIDENTIAL

SECOND ENDORSEMENT to:
USS GUITARRO Conf. Ltr.
A16-3 Serial 01 dated
15 March 1945. Report
of Fourth War Patrol.

Subject: U.S.S. GUITARRO (SS363) - Report of Fourth War
           Patrol - Comment on.

7. The Force Commander congratulates the Commanding Officer,
Officers and Crew of the GUITARRO on the completion of this extremely
long and arduous patrol and on inflicting the following damage upon
the enemy:

                               D-A-M-A-G-E-D

1 - AX (Large - 2U)                               7,500 Tons.

                                                 [SIGNATURE: Eliot H Bryant]
                                                 ELIOT H. BRYANT
                                                 Chief of Staff.
JAMES FIFE.
ORIGINAL COPY.

DISTRIBUTION

Cominch             (3) Direct       CTG-71.5             (2)
Vice Opnav          (2) Direct       CTG-71.8             (2)
Vice Opnav Op-23c   (1)              ComSubRon-26         (2)
ComSubPac           (1)              DivComsSubRon-12     (1 each)
ComlstFlt           (1)              DivComsSubRon-18     (1 each)
Com2ndFlt           (2)              DivComsSubRon-26     (1 each)
Com7thFlt           (30)             S/M School, N.L. Conn. (2)
ComSubslstFlt       (4)              Comdt. NYD, Puget Sound. (1)
ComSubs2ndFlt       (7)              SubAd, Mare Island   (2)
CTF-71              (2)              S/Ms 7th Flt         (1)
CTG-71.3            (2)

[HANDWRITTEN: J. B. Miller]
J. B. MILLER,
Flag Secretary.

UNITED STATES NAVY
14/le
21 March 1945

THIS REPORT WILL BE DESTROYED PRIOR TO
ENTRY INTO ENEMY CONTROLLED WATERS.

[STAMP: 4 03293]

- 3 -

— page 207 —
UNITED STATES FLEET
COMMANDER SEVENTH FLEET

A16-3(8)(F-3-4/jk)
Serial: [HANDWRITTEN: 01545]

[STAMP: Reg. No. [HANDWRITTEN: 318]
R. S. No. [HANDWRITTEN: 4 0393]]
[STAMP: 15 APR 1945]

CONFIDENTIAL

THIRD ENDORSEMENT on:
CO USS GUITARRO Conf.
Ltr. A16-3, Serial
01 of 15 March 1945.

From: Commander Seventh Fleet.
To: Commander in Chief, United States Fleet.
Subject: U.S.S. GUITARRO (SS363) - Report of
Fourth War Patrol.

1. Forwarded.

[SIGNATURE: R. Cruzen]
[HANDWRITTEN: By direction.]
[UNCLEAR: R. CRUZE]

— page 208 —
[HANDWRITTEN: 1ST COPY]

SS363/A16-3
Serial 02

U.S.S. GUITARRO (SS363)

Care of Fleet Post Office,
San Francisco, California.
8 June 1945.

DECLASSIFIED
A-L

From:
To : The Commanding Officer, U.S.S. GUITARRO.
Via : The Commander-in-Chief, United States Fleet.
 (Official Channels).

Subject: U.S.S. GUITARRO, Report of War Patrol Number FIVE.

Enclosure: (A) Subject Report.
 (B) Track Chart for 5th War Patrol (ComSubSFac only).

 1. Enclosure (A), covering the fifth war patrol of this vessel
conducted in Tonkin Gulf during the period 9 April 1945 to 8 June 1945; is
forwarded herewith.

T.B. DABNEY.

DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
[HANDWRITTEN: BY OP-09B7C DATE 5/30/72]
[STAMP: DECLASSIFIED]

[HANDWRITTEN: 128002]

— page 209 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

A. PROLOGUE

Arrived FREMANTLE, W.A. on 15 March 1945 after a 95 day patrol. Completed
a two week refit, during which time the ship was docked, starboard screw re-
placed, and the "ST" Radar was installed.

The normal post repair, loading and training period was completed. Ready
for sea and departed FREMANTLE on 9 April 1945 with 23 Mark 12 mines and 16
Mark 18 torpedoes.

The following officers were detached this refit:-

Lieutenant William W. ENNIS, U.S. Navy.
Ensign Edgar P. CROWNOVER, U.S. Navy.

The following officers reported on board for duty:-

Lieut-Comdr. John C. RAIT, U.S. Navy.
Ensign John S. MEDD, Jr., U.S.N.R.
Ensign James B. HENNEGAN, U.S. Navy.

B. NARRATIVE

The following named officers and chief petty officers, together with the
total number of war patrols each has made, were attached to and serving on
board this vessel at the beginning of the fifth war patrol:-

DANEY, Thomas Bullard Commander U.S.N. 8
RAIT, John Crocker Lieut-Comdr. U.S.N. 0
BRACCIA, Anthony Augustine Lieutenant U.S.N.R. 1
TRAYLOR, James Thomas Lieutenant U.S.N. 4
SCHILANSKY, James Leonard Lieut.(jg) U.S.N.R. 4
FARR, Arthur Harrison Lieut.(jg) U.S.N.R. 4
BERNARD, David George Lieut.(jg) U.S.N.R. 4
MYLES, Donald Keene Ensign U.S.N.R. 2
MEDD, John Sidney, Jr. Ensign U.S.N.R. 0
HENNEGAN, James Bernard Ensign U.S.N. 0

FISHER, Frank Aubrey CEM(AA)(T) U.S.N. 2
HIRSCH, Irvin Jack CPhM(AA)(T) U.S.N.R. 6
KEINRATH, Frank Charles CRM(AA) U.S.N. 4
KOPEY, Theodore (n) CMOMM(AA) U.S.N. 4
RAGSDALE, James Brittain CY(AA)(T) U.S.N. 10
STEWART, John Henry CCS(T) U.S.N. 5
STUMPF, Howard Wilburn CMOMM(AA)(T) U.S.N. 4
WALLS, Carl Howard CTM(AA)(T) U.S.N. 7

- 1 -

— page 210 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

B. NARRATIVE (Cont.)

9 April 1945.

1400(I) Underway from FREMANTLE, W.A. for fifth war patrol in accordance
with Commander Task Group Seventy-One point One Operation Order No.
47-45 of 8 April 1945.
1737(I) Trim dive.
1757(I) Surfaced.
1900(I) Rendezvous with HMS SOLENT and HMS SLEUTH for training exercises.
2100(I) Commenced night training exercises.
2400(I) Exercises completed - set course for patrol area.

10 April 1945.

1120(I) Made trim dive.
1136(I) Surfaced.
1807(I) Exchanged recognition signals with RMN ZWAARDVISCH.
Conducted fire control drill.
2320(I) Exchanged recognition signals with USS BESUGO.

11 April 1945.

0719(I) Quick dive.
0749(I) Surfaced.
0950(I) Battle Surface. Fired all automatic weapons.
1119(I) Quick dive.
1140(I) Surfaced.
1503(I) Quick dive.
1533(I) Surfaced.
1600(I) Plotting and fire control drill.

12 April 1945.

0240(I) Received serial from CTF 71 directing us to put in at EXMOUTH GULF.
0255(I) Set course for EXMOUTH GULF.
0950(I) Sighted VLAMING HEAD Light bearing 081°T, 12 miles.
1355(I) Moored starboard side to USS COUCAL at EXMOUTH GULF.
1735(I) Underway for patrol area.
2325(I) Took departure for LOMBOK STRAIT.

13 - 14 April 1945.

Underway conducting training dives, Battle Surface and fire control
drills enroute to LOMBOK STRAIT.

15 April 1945.

0905(I) Dived.
1000(I) Surfaced.
1725(I) Sighted land bearing 013°T, 45 miles.

- 2 -

— page 211 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

B. NARRATIVE (Cont.)

15 April (Cont.)

2027(I) Commenced transit of LOMBOK. Small moon, good visibility, lights
           blinking on BALI, Japanese shore based radar on AFR - sweeping
           astern. Sea astern and current is very swift - south bound -
           was better in the "narrows" with terrific tide rips visible.
           making about ten knots or less over the ground.
2100(I) SJ contact dead astern, 5000 yards. Contact disappears in water
           on radar screen. We search astern. Nothing visible. Must
           a phantom.
2128(I) Captain, O.O.D., Jr. O.O.D. and 4 lookouts on the bridge sight a
           plane in our zenith. Range 500 feet. Engine purring smoothly - no
           exhaust flash. Single float - RUFE - moving fast - "Turn on the SD
           radar and key it 5 minutes out of every thirty seconds" from
           Captain - It's too late now. Bombs away? We don't hear anything.
           Possibly he doesn't see us since our wake blends in smoothly with the
           heavy tide rips. He is opening out to northward dead ahead. Both
           radars loose contact at about 7 miles.
2130(I) Contact on SJ radar, 8000 yards and closing fast from the port
           quarter. This guy must have us. I think he's another plane. There
           is nothing to do but take her down.
2133(I) Quick dive to 100 feet. In this current we are having a hard time
           controlling depth. No bombs! Maybe he didn't see us. Wait and
           sweat. Can't stay down long here or we'll be back in the INDIAN
           OCEAN - with a patrol boat on top of us.
2135(I) Surfaced. All ahead flank on four engines. Very anxious to get around
           before he returns again. Also decide to move over to the star-
           board side of channel and keep out of the groove. If that fellow
           saw us, he is sure to announce our presence.
2140(I) Here's another Jap. SJ contact bearing 105°T, range 8000 yards.
           This time its a patrol boat going south, headed for our diving
           position in "the narrows" - changed course forty degrees to left
           and at
2300(I) We lost this fellow at 10,000 yards.

16 April 1945.

0700(I) Made quick dive in JAVA SEA.
1728(I) Sighted US submarine (unidentified) bearing 210°T, 6000 yards,
           course 120°T. Did not attempt to exchange recognition signals
           as we looked in a hurry to make LOMBOK that night.
1900(I) Surfaced. Sighted sailboat bearing 270°T, distance 10,000 yards.
           Manned automatic weapons - closed to investigate. Boat turned out
           to be small 40' rig with women and children present so did not
           molest.

17 April 1945.

1351(I) Lookout sighted plane bearing 253°T, range 8 miles. Plane on
           southerly course, vanished in clouds. Dived.

- 3 -

— page 212 —
C-O-N-F-I-D-E-N-T-I-A-L
B. NARRATIVE (Cont.)

U.S.S. GUITARRO
Fifth War Patrol

17 April (Cont.)

1705(I) Surfaced.
2000(I) Commenced transit of KARIMATA STRAIT.

18 April 1945.

0240(I) Completed transit of KARIMATA.
0800(I) Dived for submerged patrol to avoid being sighted before we complete
special mission.

19 April 1945.

0613(I) Dived.
0620(I) On the bottom for the remainder of day, depth - 93 feet.
(See report of special mission.)

20 April 1945.

Special mission completed.
0737(I) Quick dive to 85 feet - depth of water 120 feet.
1000(I) Sighted plane (RIFE) bearing 240°T, distance 5 miles. Wonder if
he's looking for us?
1010(I) Sighted another plane bearing 200°T, range 3 miles. Made depth 105
feet. Must get as much water as possible over me and avoid hitting
the bottom. If I stir up any mud this guy will be on me.

21 April 1945.

0713(I) Dived on BORNEO - SINGAPORE traffic route for a patrol across
traffic lane.
1700(I) Surfaced.
2200(I) Commenced transit between GREATER NATOENA and SOEBI BESAR.

22 April 1945.

1045(I) SD plane contact at 9 miles, closing. Friendly response.
1048(I) Sighted friendly PB4Y2. Recircled us. We endeavored to communicate
on VHF and area frequency (voice and CW). No luck.
1115(I) Lost sight of plane.
1247(I) Dived.
1420(I) Surfaced.
1600(I) Fire control, tracking and T.D.C. drill.

23 April 1945.

1301(I) SD contact at twelve miles - closed to 10 miles. No IFF. Not
sighted. Lost contact at twelve miles. This contact consisted of
several pips.

- 4 -

— page 213 —
C-O-N-F-I-D-E-N-T-I-A-L
B. NARRATIVE (Cont.)

U.S.S. GUITARRO
Fifth War Patrol

23 April (Cont.)

1330(I) IFF response at 20 miles - numerous SD contacts at 12 miles.
         Sighted several formations of P-38's heading toward PALAWAN. One
         plane closed to three miles and then went on his way.

24 April 1945.

1030(I) Sighted periscope bearing 260°T, 1000 yards - turned away. Glad
         we were using Arma clock on three engines.
1200(I) IFF response at 15 miles. Sighted friendly LIBERATOR. Contact on
         VHF. He was proceeding to CHINA COAST - in Uncle sector. He had
         no information for us.
1607(I) SD contact at 18 miles - no IFF. Plane closed to 8 miles so dived.
1635(I) Deep dive - rigged for depth charge and silent running.
1651(I) Surfaced - fire control drill.
2245(I) SJ interference - exchanged recognition signals with USS LAGARTO.
         Closed and exchanged information on VHF. Relieved LAGARTO on
         station. She reported two possible torpedo attacks against her. No ship con-
         tacts. Numerous Jap plane contacts.

25 April 1945.

0845(I) Sighted coast of HAINAN ISLAND bearing 330°T, range 40 miles.
1312(I) 10 miles off beach - weather hazy - SD contact at 18 miles - closed
         to 8 miles, no IFF. So at
1320(I) Dived. Closed beach to 5 miles and looked over GAALONG BAY. All
         clear.
2046(I) Surfaced. Bright moonlight - no clouds - sea calm. Jap radar on APR.
2342(I) SD contact at 10 miles, closing - dived.

26 April 1945.

0009(I) Surfaced.
0620(I) Dived - closed beach for submerged patrol off GAALONG BAY - GAALONG
         POINT. Has about best possibilities for intercepting coast hugging
         traffic.
0950(I) Sighted several small sail boats - patrolling 4 miles off beach.
         Nothing in GAALONG BAY. Also noted radio or radar installations
         on hill.
1321(I) Unidentified explosion.
2042(I) Surfaced.
2144(I) Moon was very bright - sea calm. Jap radar on APR. Keying on SD radar
         5 seconds out of 60. Plane contact on SJ radar at 22,000 yards.
         Plane closed to 19,000 yards and lost contact.
2200(I) Sighted large searchlight on peak near water
         SAMAH BAY on the starboard beam. Large searchlight on peak
         trained directly at us. However, we were 15 miles off beach be-
         yond his range. Watching both radars carefully now for contacts. Be-
         lieve Japs are using shore based radar to detect us and then turning
         on searchlight to indicate our position to plane.

- 5 -

— page 214 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

B. NARRATIVE (Cont.)

26 April (Cont.)

2226(I) SJ contact at 14,800 yards bearing 003°T. This in the direction
of CAPE SAMAH. Contact closed to 8300 yards, so at
2227(I) Dived.
2312(I) Surfaced.
2326(I) SJ plane contact bearing 100°T, range 4000 yards, so dived. SJ
tracked plane opening out while submerging.

27 April 1945.

0009(I) Surfaced. In view of bright moonlight and persistent Jap air patrols
believe it unwise to remain in this vicinity tonight. LAGARTO re-
ported he had torpedoes fired at him on two occasions. It is pos-
sible they have small subs operating in conjunction with planes. Believe
the only safe course in this area while moon is bright is to change
our patrol area frequently. Remaining in one spot too long may be
disastrous. Decided to patrol possible shipping lanes between
YULINKAN and TOURANE BAY along edge of blind bombing zone. Closed
0500(I) Sighted small boat in water clearly visible in moonlight. Closed to
500 yards to investigate. Found boat to be small 30' fishing vessel -
3 occupants. This was the first of numerous contacts during day - all
same type and about the same number of crew. Did not molest.

0721(I) Dived.
0831(I) Surfaced.
0920(I) SJ contact at 30,000 yards, bearing 196°T. Radar Tracking Station.
0931(I) Contact closed to 26,100 yards. Sighted what appeared to be large
ship with small angle on bow - painted white. Atmosphere was hazy
and small boats had the appearance of much larger objects when picked
up on the horizon, but because of extreme range, I was sure this
was a large ship - possibly a hospital ship. Since his angle on the
bow was small, decided to dive and commence submerged approach.
0931(I) Dived.
1032(I) Object was not getting any closer, so surfaced and took another
look. Finally made him out as small sail boat (same as all
the others except his sail was rigged). It had three occupants.
Continuing on surface patrol. Many boats in sight.

28 April 1945.

0700(I) Dived. Sailboats still with us.
2009(I) Surfaced.
2213(I) Moon bright - sea calm - visibility good. Keying SD and using SJ
radar continuously. OOD and lookout sight torpedo wake across
our bow at 50 yards. We were zig zagging with Arma clock - that's
what saved us.
2214(I) Diving - passing 25 feet all hands heard distinct but not too heavy
explosion. Two lights were broken in engine room - no other ill
effects. Decided this was either end of run torpedo explosion or aircraft
bomb. As we had no contacts on SJ or SD, it is possible the attack
was made by a submarine. From all appearances the Japs must be DF'ing
our SD radar. There is no doubt in my mind that a torpedo was fired
at this vessel either by an aircraft or a submarine.
- 6 -

— page 215 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

B. NARRATIVE (Cont.)

28 April (Cont.)

2343(I) Surfaced - cleared area to East.

29 April 1945.

Aviators report ships in YULINKAN BAY. Will patrol there submerged
today.
0705(I) Dived. Closing beach for submerged patrol.
0930(I) Sighted two (100') sailboats in YULINKAN BAY.
1026(I) Sighted unidentified Jap plane patrolling along beach. Nothing in
YULINKAN BAY except two sailboats.
1510(I) Unidentified explosion.
2041(I) Surfaced. Same Jap radars on APR. Radars come on about moonrise and
remain on until midnight when they secure. They are keyed intermit-
tently at about 5 - 10 minute intervals.
2250(I) Possible SJ plane contact.

30 April 1945.

0621(I) Dived.
1758(I) Surfaced to have a better look at sailboat. Found him similar to
others, so at
1807(I) Dived.
2034(I) Surfaced.
2151(I) SJ plane contact 21,000 yards bearing 350°T.

1 May 1945.

0058(I) OOD heard what he believed to be sound of airplane motors. No con-
tacts on SD or SJ.
0102(I) Moon is up - atmosphere clear - lookout sights large twin motored
plane directly overhead. Elevation 1500 feet. Dived. No bombs.
It is difficult to explain how this plane closed us without being
detected on either radar as both radars are in good condition. We
have had to dive at least once each evening since arrival in the
area.
0229(I) Surfaced.
0643(I) Dived. Submerged patrol off YULINKAN BAY.
1155(I) Unidentified explosion.
1406(I) Sighted Jap (BETTY) plane off YULINKAN BAY. No shipping in YULINKAN
or SAMAH. Sighted various shore installations on Bay.
2041(I) Surfaced.
2210(I) Exchanged recognition signals with USS SEA LION.

2 May 1945.

0659(I) Submerged for patrol off SADDLE ISLAND between LING SUI POINT and
NAMKING ISLAND.

- 7 -

— page 216 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol
B. NARRATIVE (Cont.)

2 May (Cont.)

0915(I) Sighted small sailboat in Bay.
1750(I) Sighted two small sailboats in Bay.
2039(I) Surfaced. Will patrol close inshore off GAALONG POINT tonight.

3 May 1945.

0103(I) APR contact at 175 megacycles - saturation pip bearing South.
0105(I) SJ plane contact 15,000 yards bearing 180°T.
0123(I) SJ plane contact at 10,000 yards, bearing 220°T. Dived. Plane
closed to 6000 yards before our SJ went under.
0220(I) Surfaced.
0240(I) SJ and SD plane contact at 22,000 yards. APR contact on 175 mega-
cycles. This plane remained within 6 - 12 miles until
0301(I) All clear on radar. Received message from C.T.F. 71 informing us
that a Navy PRIVATEER plane was lost in vicinity of HAINAN ISLAND.
Decided to spend today on surface trying to locate any possible
survivors. Searching to East and South of HAINAN ISLAND.
1907(I) Plane contact on SD radar at 6 miles closing. Dived.
1958(I) Surfaced.
2045(I) SJ contact at 2000 yards bearing 080°T. Investigated and found to
be small sailboat.
2325(I) SJ plane contact 23,000 yards bearing 265°T.

4 May 1945.

0329(I) SJ contact bearing 002°T, range 7350 yards. Radar tracking party
manned. Tracked target on course 315°T, speed 4 knots.
0403(I) Commenced closing target for a 90° port track.
0416(I) Made out target to be small sailboat, 30 - 40' long, with sail
rigged. Secured from battle stations.
0643(I) Dived for submerged patrol off SOUTHWEST POINT. Endeavoring to
spot traffic using Western shore during daylight hours. Sighted
a few very small fishing boats.
2025(I) Surfaced. Patrolling along coast off SOUTHWEST POINT endeavoring
to pick up any traffic trying to go North during darkness. Do Not
believe present traffic spotted in YULINKAN and SANAH BAYS could
be coming from South since we covered these approaches very care-
fully. Do not believe traffic is using East coast of HAINAN. Avi-
ators and boats to North have not reported any contacts there
and we have patrolled East coast for several days.

5 May 1945.

0627(I) Dived for submerged patrol off SOUTHWEST POINT. Only small fishing
vessels sighted - none over 40' in length.

- 8 -

— page 217 —
C-O-N-F-I-D-E-N-T-I-A-L
B. NARRATIVE (Cont.) U.S.S. GUITARRO Fifth War Patrol

5 May (Cont.)

2027(I) Surfaced - patrolling inshore off SOUTHWEST POINT. The water here
is shallow, 10 fathoms and less and rather spotty within 8 miles
of beach. There are numerous contacts with fishing craft. Those
without their sails rigged can seldom be picked up on the radar.
An alert watch is required to avoid running these boats down.
Several have come within 100 yards.

6 May 1945.

0615(I) Dived off LEONG SOI BAY. Will cover the Eastern approaches to
YULINKAN BAY since they offer the only opportunity for daylight
submerged attack if traffic is running close inshore.
2100(I) Surfaced. Patrolling inshore along West coast to intercept traffic
moving at night, although I don't believe Japs are moving during
darkness. Only small fishing boat contacts.

7 May 1945.

0624(I) Dived off GAALONG BAY.
1333(I) Sighted USN 'PRIVATEER' patrol plane.
2057(I) Surfaced. Patrolling West coast of HAINAN. Many small boat contacts.

8 May 1945.

0618(I) Dived off LEONG SOI BAY.
0754(I) Distant explosion.
2044(I) Surfaced. Zoomies report several ships in YULINKAN BAY. Will
patrol off West coast tomorrow with hopes that we can intercept
these ships returning northward. These ships must have entered
YULINKAN from the West coast of HAINAN as yesterday's air
searches reported nothing on INDO CHINA Coast. The only shipping
sighted was located to North of HAINAN.

9 May 1945.

0621(I) Dived off SOUTHWEST POINT.
0925(I) One distant explosion.
2055(I) Surfaced - patrolling along coast.

10 May 1945.

0625(I) Dived off SOUTHWEST POINT.
2058(I) Surfaced. Patrolling along coast. Numerous fishing boat contacts
as before.

11 May 1945.

0607(I) Dived off YULINKAN BAY. Zoomies report ships there.
2054(I) Surfaced - patrolling East and West off YULINKAN and SAMAH BAY.
No contact.
- 9 -

— page 218 —
C-O-N-F-I-D-E-N-T-I-A-L
B. NARRATIVE (Cont.)
U.S.S. GUITARRO
Pa 1

12 May 1945.

0618(I) Dived off YULINKAN BAY.
1055(I) Sighted USN 'PRIVATEER' patrol plane.
2045(I) Surfaced - patrolling East and West line along coast off YULINKAN
          and SAMAH BAYS.

13 May 1945.

0621(H) Dived for submerged patrol off YULINKAN BAY.
0845(I) One distant explosion.
1250(I) Sighted one USN 'PRIVATEER'.
2054(I) Surfaced. Radio reception had been very poor the previous evening
          and we had missed several serials. Opened out from beach to send
          message.

14 May 1945.

0400(I) Sent GUITARRO Serial two to C.T.F. 71.
0650(I) Dived for submerged patrol.
1001(I) Surfaced to try and contact aircraft by radio.
1036(I) "SD" contact at 19 miles. Contacted plane on VHF momentarily but
          plane never closed to less than 18 miles.
1042(I) Lost contact.
1356(I) Dived.
2315(I) Commenced patrol off YULINKAN BAY.

15 May 1945.

0615(I) Dived for submerged patrol off YULINKAN BAY.
1347(I) Sighted USN 'PRIVATEER' plane.
2055(I) Surfaced for patrol along coast off YULINKAN BAY.

16 May 1945.

0612(I) Dived for submerged patrol off YULINKAN BAY.
1258(I) One explosion.
2057(I) Surfaced for patrol off YULINKAN BAY.
2204(I) SJ contact on plane bearing 235°T, range 35,000 yards.

17 May 1945.

0928(I) Dived.
1837(I) Surfaced.

18 May 1945.

0613(I) Dived for submerged patrol.
0700(I) Light screws on JP. Observed small sailboat moving close to beach.
0720(I) Heard 5 distant explosions - nothing in sight.

- 10 -

— page 219 —
CONFIDENTIAL U.S.S. GUITARRO Fifth War Patrol

B. NARRATIVE (Cont.)

18 May (Cont.)

1200(I) Sighted three columns of smoke bearing 000°T. Appeared to be ships
         moving into SAMAH BAY from West close in shore. No ships in sight.
2051(I) Surfaced.

19 May 1945.

0400(I) Departed station in accordance with OpOrd. Sent Serial three to
         C.T.F. 71.

20 May 1945.

0712(I) Dived.
0750(I) Surfaced.
1520(I) Sighted radio towers on PRATAS REEF bearing 089°T, 15 miles.
1600(I) Sighted unidentified plane bearing 210°T, range 8 miles. Dived.
1642(I) Surfaced.

21 May 1945.

0800(I) SD plane contact at 30 miles. IFF response.
1216(I) Sighted unidentified plane bearing 095°T, 12 miles. Dived.
1311(I) Surfaced.
2100(I) Sent Serial one to C.T.F. 17.
2200(I) Transmitting BALINTANG CHANNEL. Passed to ComSubSPac Op control.

22 May 1945.

1030(I) SD contact at 25 miles.
1035(I) Lost contact at 23 miles.
1316(I) SD contact at 30 miles.
1322(I) Lost SD contact.
2115(I) Sent rendezvous despatch to C.T.G. 17.7.

23 May 1945.

0602(I) Dived.
0616(I) Surfaced.
0705(I) Sighted abandoned life raft. No occupants.
0717(I) Small arms instruction and practice firing.
1900(I) SJ radar contact bearing 132°T, range 13,950 yards on USS CAPITAINE.
         Exchanged recognition signals.

24 May 1945.

0544(I) Dived.
0556(I) Surfaced.
0815(I) Friendly IFF response at 14 miles. Lost contact at 16 miles. We
         had numerous contacts throughout the morning, all friendly. Some
         were patrol planes, others were transport planes.

- 11 -

— page 220 —
C-O-N-F-I-D-E-N-T-I-A-L
B. NARRATIVE (Cont.)

U.S.S. GUITARRO Fifth War Patrol

24 May (Cont.)

1757(I) Dived.
1815(I) Surfaced.

25 May 1945.

0623(I) SD contact at 4 miles opening.
0625(I) Sighted friendly plane bearing 210°T, range 5 miles. Many friendly
plane contacts throughout the day.
1531(I) Dived.
1542(I) Surfaced.
2117(I) SJ radar interference bearing 063°T.
2130(I) Exchanged recognition signals with USS CERO.
2230(I) SJ radar contact on USS CERO bearing 051°T, range 11,800 yards.

26 May 1945.

Many friendly plane contacts throughout the day.

27 May 1945.

0142(I) SJ radar contact bearing 020°T, range 19,000 yards on what appeared
to be an escort carrier.
0145(I) SJ radar contact bearing 020°T, range 9,900 yards on two additional
ships which appeared to be DE's. Endeavored to exchange recognition
signals at 10,000 yards by blinker tube - unsuccessful. Discont
contacts.
0228(I) Lost all contact with forces above. They were using IFF so we got
our own for about 15 minutes. This was the only identification
which appeared to be satisfactory.
0504(I) Sighted two submarines at SAIPAN Rendezvous. Identified as U.S.S.
PADDLE and U.S.S. LOGGERHEAD.
0518(I) Sighted mast of LST 1098, our escort to SAIPAN.
0545(I) Fell in with PADDLE, LOGGERHEAD, and LST 1098 for entry into SAIPAN.
0700(I) Moored alongside USS ORION at SAIPAN.

28 May 1945.

Having fueled and provisioned and enjoyed the hospitality of the
ORION, we departed alongside at
1316(I) In company with the USS LOGGERHEAD and PC escort vessel enroute
to dive.
1730(I) Lost company with escort and USS LOGGERHEAD.
1800(I) Dived.
1815(I) Surfaced.
2100(I) SJ radar contact on two large merchant ships and escort bearing
000°T, range 38,000 yards.
2347(I) SJ radar contact on friendly submarine at 7,500 yards - exchanged
recognition signals.

- 12 -

— page 221 —
C-O-N-F-I-D-E-N-T-I-A-L
                                                              U.S.S. GUITARRO           Fifth War Patrol

B. NARRATIVE (Cont.)

                                        29 May - 7 June 1945.

          Conducting drills, dives and training exercises enroute Pearl Harbor.
          All officers completed three days of navigation work. Qualified new
          men.

                                        8 June 1945.

0600(VW) Rendezvoused with PC 1077.
1100(VW) Moored at Submarine Base, Pearl Harbor, T.H.

                                        - 13 -

— page 222 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

C. WEATHER
The weather on station was good at all times with an average wind of 3
to 5 knots and a sea of about force 1 to 2, both from the northeast. Inter-
mittent tropical rain squalls were experienced in the evenings and early morn-
ings accompanied by a general overcast of cumulus clouds at about 3000 feet.
Along the coast of HAINAN the mornings were clear until about 1000 followed by
haze over the land lasting until about 1700 at which time it was cleared-up
rain squalls over the land.

D. TIDAL INFORMATION
Currents in TONKIN GULF and along the coast of HAINAN were not consis-
tent, varying with the surface wind. Generally the set was with the wind,
the drift not exceeding one knot. Along GAALONG BAY and YULIN BAY, the cur-
rent followed the coastline and was consistently from the East. In TONKIN
GULF the set was always with the wind and the drift so slight as to be
negligible. In LING SOI BAY we experienced a Southwest set with a 0.5 drift
while we were submerged.

E. NAVIGATIONAL AIDS
In general, no outstanding navigational aids were observed on the patrol.
All navigational positions obtained from ST ranges and TBT or periscope bear-
ings worked out in excellent fashion provided a sharp promontory or mountain
was used. Along the HAINAN coast during the hazy daytime weather, excellent
bearings on shore landmarks were obtained at a 56' periscope
depth at ranges up to 20,000 yards. This was possible because of the high
promontories which gave good tangential bearings with an accurate
high land in the center. It was noticed that the mountain peaks
on all the H.O. and H.O. reproductions of British Admiralty charts were some-
what in error, the greatest errors being on the inland mountain ranges, but
in all cases the tangents on CAPES GAALONG, SALMON, and SOUTHWEST gave good
positions.

F. SPIE CONTACTS

Date | Lat. | Long. | Type(s) | Initial Range | Course Speed | Brg. (T) | Hdw | Cont. | Remarks
---|---|---|---|---|---|---|---|---|---
[HANDWRITTEN: 1. 4/10/45] | 17-07S | 112-30E | 1 - SS | 12,000 yd | 010°T 10 kts | 328 | P | Exchanged re-
| | | | | | | | | cog. sig. RMS
| | | | | | | | | ZMAARDVISH
[HANDWRITTEN: 2. 4/10/45] | 17-55S | 112-25E | 1 - SS | 30,000 yd | South | 023 | R | Exchanged re-
| | | | | | | | | cog. sig. USS
| | | | | | | | | BESUGO.
[HANDWRITTEN: 3. 4/15/45] | 10-15.9S | 112-07E | 1 - SS | 3,000 yd | ? | 040 | SD | Sighted peri-
| | | | | | | | | scope. Avoided

- 14 -

— page 223 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

F. SHIP CONTACTS (Cont.)
No. | Date | Lat. | Type(s) | Initial | Course | Brg. | How | Remarks
    | Time | Long. |         | Range   | Speed  | (T)  | Cont. |

4. | 4/14/45 | 15-57.6S | 1 - SS | 30,000 yd | South | 028 | R | Exchanged re-
   | 0405(I) | 114-16.2E |        |           | 12 kts |     |   | cog.sigs. USS
   |         |           |        |           |        |     |   | BLUEBACK

5. | 4/14/45 | 15-37.6S | 1 - SS | 10,250 yd | South | 038 | R | Exchanged re-
   | 0632(I) | 114-25.2E |        |           | 12 kts |     |   | cog.sigs. USS
   |         |           |        |           |        |     |   | BENGAL.

6. | 4/15/45 | 08-30S | 1 patrol | 8,000 yd | 210° | 100 | R | Avoided - Lom-
   | 2250(I) | 115-49E | boat     |          | 10 kts |     |   | bok Passage

7. | 4/16/45 | 06-22S | 1 - SS | 4,000 yd | 090° | 210 | JP snd US | Avoided - Lom-
   | 1730(I) | 114-40E |        |          | 15 kts |     | P later   | bok bound.

8. | 4/16/45 | 06-22S | Sailboat | 8,000 yd | 305° | 270 | P (sur- | Closed and
   | 1900(I) | 114-40E |          |          | 5 kts  |     | face)   | investigated
   |         |         |          |          |        |     |         | leaves (5)

9. | 4/21/45 | 01-30N | 1 - Sail- | 5,000 yd | East | 347 | P | Avoided.
   | 0755(I) | 105-45E | boat      |          |      |     |   |

10. | 4/21/45 | 01-30N | 1 - Sail- | 5,000 yd | East | 032 | P | Avoided
    | 1200(I) | 106-45N | boat      |          |      |     |   |

11. | 4/24/45 | 14-50N | 1 - Sub | 700 yd | ? | 310 | SD | Sighted peri-
    | 1030(I) | 113-20E |         |        |   |     |    | scope. Avoid-
    |         |         |         |        |   |     |    | ed.

12. | 4/24/45 | 16-33N | 1 - SS | 50,000 yd | 180°T | 345 | R | Rendezvoused
    | 2245(I) | 110-22E |        |           | 15 kts |     |   | with USS
    |         |         |        |           |        |     |   | LAGARTO

13. | 4/28/45 | 17-05.8N | Possible | 3,000 yd | ? | 255 | R | Sighted tor-
    | 2213(I) | 109-05E | sub - not |          |   |     |   | pedo wake
    |         |         | sighted  |          |   |     |   | and dived.

14. | 4/30/45 | 17-56N | 1 - US | ? | ? | 090 | R | Exchanged re-
    | 0241(I) | 108-30E | Sub    |   |   |     |   | cog.sigs.
    |         |         |        |   |   |     |   | Could not ex-
    |         |         |        |   |   |     |   | change calls.

15. | 5/1/45 | 18-02N | 1 - SS | ? | ? | 160 | R | Exchanged re-
    | 2210(I) | 109-31E |        |   |   |     |   | cog.sigs. USS
    |         |         |        |   |   |     |   | LION.

16. | 5/13/45 | 18-05N | Possible | 8,000 yd | ? | 007 | R | Changed course
    | 2245(I) | 109-36.2E | patrol |          |   |     |   | to avoid.
    |         |           | boat   |          |   |     |   |

- 15 -

— page 224 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

F. SHIP CONTACTS

No. | Date | Lat. | Type(s) | Range | Speed | (T) | Cont. | Remarks
| Time | Long. | | | | | |
17. | 5/15/45 | 17-55N | 1 - power | 7000 yd | N.E. | 355 | JP | Identified by
| 0640(I) | 109-00E | sailboat | | | | sound | periscope.
| | | | | | | | Avoided
18. | 5/17/45 | 17-32.2N | 1 - Sub | ? | ? | 180 | SD | Sighted peri-
| 1932(I) | 108-42.8E | | | | | | scope.
19. | 5/18/45 | 18-04.8N | 1 - power | ? | ? | 330 | JP | Confirmed by
| 0700(I) | 109-42.8E | sailboat | | | | sound | periscope.
20. | 5/23/45 | 20-48N | 1 - US | 13,950 yd | West | 132 | R | Exchanged re-
| 1945(I) | 131-15E | Sub | | 12 kts | | | cognized sigs. USS
| | | | | | | | GUITARRO.
21. | 5/25/45 | 17-07N | 1 - US | ? | ? | 063 | R | Exchanged re-
| 2330(I) | 139-10.1E | Sub | | | | | cognized sigs. USS
| | | | | | | | CERO.
22. | 5/27/45 | 15-30N | USS PADDLE | ) | Rendezvoused and entered SAIPAN.
| | 145-00E | USS LOGGERHEAD | )
| | | USS LCT 1098 | )

During total time in area, approximately 250 sailboats were encountered.
All these boats appeared to be fishing vessels. They were usually encounter-
ed in groups of from five to fifteen and appeared to travel throughout the
area favoring no particular section.

G. AIRCRAFT CONTACTS

Aircraft encountered in the area appeared to be flying a regular patrol
schedule. The conclusion of daily patrol was generally indicated by the dis-
appearance of Jap radar indication on the AFR. This estimation was often
supported at night by a temporary light beam which appeared to be a landing
strip on the island.

APR indications on air borne radar usually preceded any close aircraft
contacts. However, the APR indication always disappeared during the later
stage of his approach.

There was one indication of a combined sub and plane attack.

Enemy aircraft activity showed a definite decrease on dark, moonless
nights. Most of the aircraft encountered were either RUFES or BETTYS.

While submerged we occasionally saw the US "Privateer" searchers sweep
over the bays of HAINAN. However, we did not have any success at contacting
the "Privateers" while surfaced.

- 16 -

— page 225 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

H. ATTACK DATA
No attacks made.

I. MINES
No mines were encountered.

J. ANTI-SUBMARINE MEASURES AND EVASION TACTICS

In TONKIN GULF and in the near vicinity of HAINAN ISLAND anti-submarine
activity appeared to be in the form of air search, submarines, and search-
lights. Air search appeared to be strongest on moonlight nights, and, on
most occasions, appeared to cease shortly after midnight. On one occasion
in the middle of TONKIN GULF, a torpedo track was sighted across
our bow and as we were diving, was followed by a plane indication on the SJ
radar and later an explosion, indicating that there may have been a submarine op-
erating in conjunction with the plane. The strongest air searches were experi-
enced between YULINKAN BAY and CAPE TOURANE, where twin engined bombers
(Bettys) patrolled at approximately one hour intervals. These planes made
their patrols out as far as fifty miles into the Gulf from HAINAN and their
day searches in and along the coast of the island. Airports are apparently
located on CAPE SALMON and just west of the coast along LING SOI BAY. This
is assumed inasmuch as landing lights were seen on these locations on several
occasions. A rotating searchlight (one revolution every five minutes), lo-
cated on CAPE GAALONG, came on just prior to the illumination of the airfield
adjacent to LING SOI BAY. Shore-based searchlights are located on SOUTHERN
CAPE and on CAPE SALMON. These search the water adjacent to the coastline
at frequent intervals.

There were no indications of patrol boats at any time, but along a line
from GREAT CAPE to the HUE RIVER, large numbers of 40 - 50' sampans, sail
rigged, were encountered. The boats were not in groups but separated by in-
tervals of three to four miles in such a fashion that at any one time three
or four of them were in sight. Between WEST ISLAND and CAPE SALMON, several
small craft were picked-up on the radar and were encountered each night we
were in that vicinity.

K. MAJOR DEFECTS

ENGINEERING

1. No. 2 Main Engine Lube Oil Cooler
On 11 April, while operating #2 M.E. at normal load, lube oil appeared
in the sight glass of the fresh water expansion tank. A sample was drawn
from the discharge side of the lube oil cooler, and it was found to contain
about 70% oil. The cooler was replaced with the spare cooler. The lube oil
line to the regulating and relief valve was broken at the flange to allow

- 17 -

— page 226 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

K. MAJOR DEFECTS (Cont.)

ENGINEERING (Cont.)

1. No. 2 Main Engine Lube Oil Cooler (Cont.)

cooler discharge oil to flow into the sump. Lube oil was then recirculated
through the cooler using the detached pump to flush the system.
The fresh water system was flushed with the aid of air pressure applied
to the fresh water expansion tank. Following this, fresh water was recirculated
for 2 hours using the detached engine cooling pump. The cooler showed no
leaks when subjected to a 70 pound pressure test. The engine was out of com-
mission for 34 hours, and approximately 150 man hours were expended in changing
coolers.

2. Cylinder Heads

On 27 April water was noticed in #2 M.E. sump. Inspection revealed that
the head on #15 unit was cracked about halfway down in the injector cavity.
The head in all other respects was normal. The head was renewed, and no fur-
ther difficulties were encountered with this unit.

On 14 May the above symptoms reoccurred and the trouble was traced to the
head on #13 unit. A small crack was located in the injector cavity in approx-
imately the same location as the crack in #15 head. This crack was very small,
however, and the leakage appeared only under a test pressure of 40 pounds.
These failures may have some connection with the lube oil cooler failure, at
which time the fresh water system became contaminated with lube oil. The
system was flushed after the cooler failure, but needs a good recirculation
with a solution of carbon tetrachloride or trichlorethylene. The head was
renewed, and it was decided to put this engine on limited service until a
thorough cleaning of the fresh water system could be accomplished.

ELECTRICAL

1. Regulating Governor Control, #4 Main Engine

The phase relationship between the synchronous transmitter governor lo-
cated on the maneuvering board and the synchronous speed adjusting motor on the
regulating governor became displaced giving an erratic reading. This was fol-
lowed closely by blown fuses cutting out the circuit. Both the transmitter and
the receiver were checked thoroughly for grounds and short circuits with no un-
usual conditions noted. The fuses were renewed, but the transmitter remained
inoperative. A spare transmitter was installed and the circuit worked normally.
A few days later the fuses blew out again. Both the transmitter and re-
ceiver were torn down and the following conditions were found to exist:-

1. The transmitter was badly burned and was beyond repair.
2. One lead in the receiver was found to be grounded. This was a
result of the vertical shaft in the receiver rubbing against the
lead and wearing the insulation off of the conductor.

- 18 -

— page 227 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

K. MAJOR DEFECTS (Cont.)

ELECTRICAL (Cont.)

1. Regulating Governor Control, #4 Main Engine (Cont.)
This ground did not appear in the receiver when it was checked after the first
failure, possibly due to the fact that the ground was only active when the
conductor was moved in one position against the vertical shaft. Since no spare
transmitter was available, the speed of #4 M.E. was matched manually to that
indicated on the receiver of #3 M.E.

2. Dead Reckoning Analyzer Indicator
A recurring ground appeared on the I.C. switchboard and it appeared to
be in the D.R.A.I. supply switch on the gyro panel. All of the circuits
D.R.A.I. were checked clear when disconnected and rung out. The Distance Output motor
overheated during operation so it was checked, and new brush rigging was instal-
led. The ground disappeared and the motor ran normally without overheating.
A week later the overheating started again and the D.R.A.I. failed to record
properly. The Distance Input Motor was again checked and it was found that the
winding on one phase was partially shorted to itself. Since no wire of the
correct gauge was available for rewinding, the D.R.A.I. remained out of commis-
sion.

L. RADIO
Outside of normal routine maintenance, the RAL's, RAK, RBO and RBH needed
little repair. A worthy feature to note was that grounding the power leads of
the above receivers at the point of entrance to their cases eliminated practi-
cally all SD interference when it was used.

The TBL-7 performed in a creditable manner and outside of a defect
voltage meter, no other major defects were noted.

The procedure of cleaning the salt coating from all antenna insulators
weekly proved its value by the increase in resistance to ground and better
performance.

VIXO
Reception of signals from VIXO while enroute to patrol area was satisfac-
tory 24 hours a day. In the area, considerable jamming was encountered on 9250
kcs. and 4370 kcs. Jamming from Jap stations was of the "Rag Pipe" type and
also constant keying. Interference from NPM and NPG was also experienced and
proved to be very bothersome from about 1300 - 1600 GCT several times. It was
also found that reception from VIXO was impossible for about three nights from
1200 - 1600 GCT due to atmospheric conditions. Our success in transmitting was
fair but usually the time necessary to make original contact varied from about
thirty to forty minutes.

- 19 -

— page 228 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

L. RADIO (Cont.)

NPT-1

Reception from NPT-1, while on station was excellent except for odd peri-
ods during the day especially from 1100 - 1600 GCT during which time the signal
strength would drop to about S-2 to S-0 with excessive high frequency jamming
from local Japanese stations, making copying impossible. Shifting of fre-
quencies was attempted with little or no success. Since our departure from the area
reception has been S-5 with the jamming greatly reduced. It is the opinion of
the communication personnel of this ship that we were receiving in what might
be called a null area. This fact together with the fact that we were, in most
instances, very close to high mountains, resulted in poor reception and fre-
quently a drifting signal.

COMNAVGROUPCHINA (4155kcs)

Every night for several weeks during the patrol, messages were received
from COMNAVGROUPCHINA over 4155 kcs. at 1800 GCT with no troubles experienced.

WOLFPACK COMMUNICATIONS

We had little opportunity to use the WOPACO frequency but our reception
of the transmissions made by other submarines and aircraft was, on the whole,
satisfactory. It was noted in many instances that improper procedure was being
used in that boats invariably made preliminary call-ups prior to broadcasting
dispatches instead of sending call and messages together and waiting for
"ROGER" for both.

VHF

We made use of the VHF on two occasions, once with a plane and once with
a submarine using bands four and one respectively with equally good results on
both bands. When in voice contact with the plane, we had good reception up to
eighteen miles. On same occasion, plane's transmissions came in loud and clear
over the APR. The VHF operated in a highly satisfactory manner this patrol period and
communications with friendly planes up to 18 miles was made. After being a dis-
appointment during the past two previous patrols, it was demonstrated during
this patrol that tuning the unit outside of the ship will not always give
maximum reception and the only sure way is to adjust the frequencies after the
unit has been installed.

M. RADAR

SJ

No major defects were noted in the SJ-1 during this patrol, but the in-
creased load on the A and B regulated rectifier units and the main control unit,
because of the installation of the ST, created a series of minor troubles which
are worth mentioning. There was continual burning out of the load voltage
switch and the fuses F1 and F2 in the main control unit. These are designed

- 20 -

— page 229 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

M. RADAR (Cont.) SJ (Cont.)

for a maximum 20 amp. load, but with the present installation, the unit is
drawing in excess of 25 amps. This trouble was remedied by installing 25 amp.
fuses and shorting out the switch, since the system was kept on filament supply
continuously when not in use. Likewise the 5U4G rectifier tubes should be re-
placed by another type to compensate for the increased current flow thru them.
Six of these tubes were replaced during this period. The remedy to these de-
fects is not due to improper maintenance, but in the use of parts designed for
a higher load and rating.

Low and erratic gain was experienced in both the SJ and ST during the first
two weeks of the patrol, and it was necessary to continually replace the 6J7's
in the IF strip and the 6SK5's in the pre-IF amplifier in the ST selector unit.
After a thorough check-up, the cathode resistor R114 in the new IF gain control
circuit was found to be intermittently shorting out as it heated up. Replace-
ment of these resistors brought conditions back to normal with the maximum gain
and no IF trouble. It is advisable that the wattage of this resistor be in-
creased from ½ to 1 watt since the parallel resistors R113 and P4, the gain
potentiometer, in series with it are each of ½ watt rating and can therefore
dissipate twice as much current.

Again, as in the previous patrol, the new grated reflector proved its value
in picking up planes. During moonlight nights it missed very few contacts at
ranges varying from 6,000 to 40,000 yards.

Normal, surface ranges on the SJ-1 were exceptional. High peaks of 5000
feet and above were carried out beyond 175,000 yards and DISCOVERY BANK
ISLAND at the entrance to KARIMATA STRAIT was contacted at 35,000 yards. Ex-
ceptional atmospheric conditions enabled this radar to detect sailboats at
ranges from 9,000 to 31,000 yards. The range on American submarines averaged
around 14,000 yards.

The OBU echo box was installed during the past refit and the crying need
for a resonator of this type a year ago was demonstrated during this patrol.
It was used daily to tune up the unit and as a check on the overall performance
of the SJ. It proved the conviction that tuning on distant land marks is not
the most efficient method, since varying atmospheric conditions often cause
radical differences in ranges obtained on the same body.

SD-4

The SD was used mainly enroute to and from the Area and very sparingly in
the Area, since indications showed that it was probably being "dog for".
With the exception of repairs made to the sweep to increase better focus and
astigmatism, few defects were encountered. The 60 mile sweep on the SD was
improved considerably with little error in range calibration by changing the
value of C242 from .0005 to .0055 mfd and R249 from .1 meg to .5 meg ohms. Also
the recent BuShips modification No. eighteen of changing R-275 from 3.9 to 4.7
meg ohms was made.

- 21 -

— page 230 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

M. RADAR (Cont.)

ST

Despite the evidence from recent patrol reports on the erratic operation
of the ST, little trouble was experienced with it. It stayed in almost perfect
tuning during the entire patrol and very rarely took more than 15 minutes to
warm up, since the filament supply to it was on continuously. A daily mainte-
nance check with a thorough inspection and cleaning of all components was made.
The procedure of using the SJ on AFC tuning and then setting the receiver
dial for maximum tuning of the ST made it easy to switch from one unit to the
other and obtain contacts rapidly. It is regrettable that no opportunity
had to use this remarkable piece of gear in a submerged attack. It proved its
value otherwise as an aid in getting navigational fixes submerged and ob-
tained ranges of 30,000 to 40,000 yards on 200 and 300 foot islands with only four
feet of periscope exposed. Maximum ranges on high peaks at this same depth
were from 60,000 to 80,000 yards. Before surfacing at sunset it was used for
search purposes.

During the training period, the following ranges were obtained on a Frigate
of the HUTCHINSON class:-

| DEPTH | RANGE |
|---|---|
| 52 ft. | 16,000 yds. |
| 56 ft. | 10,000 yds. |
| 60 ft. | 5,000 yds. |

The only material defects were the replacement of the 6JK5's (due to the
trouble encountered in the IF gain control resistance) and two bad 6V6GT's, one
in the voltage dropping stage and the other in the sync pulse stage of the
selector unit.

APR

A directional antenna unit consisting of four pancake half wave di-poles
horizontally polarized was installed in quadrature sections around the conning
tower protection shield and proved quite successful in detecting the approxi-
mate bearing of enemy beamed radars. It was notable that the directional
units on HAINAN was checked to within ±5° of those positions pre-
viously plotted by CinCFac. Another great advantage of using the directional
unit during close inshore patrol at night was the ability to distinguish sea-
borne or air borne radars from the shore based units when contact was made by
seaward. A 175 MC airborne radar was detected in this manner and contact
SJ was made a short while later. No material defects were encountered in either
di-poles or the normal antenna and only routine replacement of defective
detector was necessary despite the continual use of the AN-1/AN/APA-1 receiver
while operating on the surface.

IFF

The IFF gear was seldom used but on occasions when it was in service,
ranges up to 46 miles were obtained on a squadron of P-38 Lightnings. The
gear was only used enroute to and from station and needed no servicing.

- 22 -

— page 231 —
C-O-N-F-I-D-E-N-T-I-A-L
U.S.S. GUITARRO
Fifth Patrol

M. RADAR (Cont.)

LORAN
This unit proved to be a disappointment since its installation during the
past refit. Although a careful weekly routine check was made on it, great dif-
ficulty was experienced in contacting any station which could be used to obtain
a fix. Despite complete shielding and bonding of all leading cables, the
60 cycle AC type was excessive and often blanked out any pips.
It is hoped that this unit will be moved to another position during the next
overhaul.

N. SOUND GEAR AND SOUND CONDITIONS
Only one contact was obtained by sound and this proved to be a small power
driven sailing boat contacted at approximately 10,000 yards on the JP-1. Due to
the extreme scarcity of ship contacts little opportunity was had to determine
the efficiency of the QB and JK. No repair troubles were encountered. The
high background noise obtained while submerged off HAINAN indicated the units
were operating properly. The QB was used as a torpedo detector while running
on the surface at night at one engine speed. No sound contacts of this type
were noted. Sound conditions appeared normal with calm seas and low wind pre-
vailing. An unusual feature was the gradual decrease in the density layer at
periscope depth from a 6° negative gradient to an almost complete isothermal
layer to 100' at the end of the patrol.
The brush crystal earphones previously used with the JP-1 were replaced
by the new magnetic low impedance phones which proved quite satisfactory.

O. DENSITY LAYERS

Time | Lat. | Surf. | Remarks
Date | Long. | Temp. |
1607(I) | 15-51N | 84°F | 12° negative gradient from 110' to 260'.
4/24/45 | 110-18E | |
1320(I) | 17-55N | 80°F | Surface gradient only.
4/25/45 | 109-42E | |
0630(I) | 18-00N | 81°F | Negative gradient of 4° per 100' from surface.
4/26/45 | 109-30E | |
0700(I) | 18-00N | 89°F | Sharp negative gradient at 50'.
4/28/45 | 109-39E | |
0643(I) | 18-00N | 87°F | 4½° negative gradient from 40' to 85'.
5/1/45 | 108-00E | |

- 23 -

— page 232 —
C-O-N-F-I-D-E-N-T-I-A-L
U.S.S. GUITARRO
Fifth War Patrol

O. DENSITY LAYERS (Cont.)

Time | Date | Lat. | Long. | Surf. Temp. | Remarks.
0659(I) | 5/2/45 | 18-00N | 108-00E | 87°F | 6° negative gradient from 40' to 90'.
0615(I) | 5/6/45 | 18-08N | 109-30E | 88°F | Isothermal to 100'.
0607(I) | 5/11/45 | 18-03N | 108-10E | 87°F | Isobalast.
0618(I) | 5/12/45 | 18-03N | 109-10E | 86°F | Isothermal to 90' started negative layer.
0621(I) | 5/13/45 | 18-00N | 109-00E | 87°F | 2° positive layer at 95'.

Although the surface temperatures were fairly constant, the Bathytherm-
graph showed a gradual change from sharp negative gradient through iso-
thermal to positive gradient. It is believed that this was caused by increasing
wind during our stay in the area. No attacks were made, therefore no
depth cards were made.

NOTE: All depths SBT Blister. 2000# SBT cards used.

P. HEALTH, FOOD, AND HABITABILITY

Throughout the patrol the health of the crew was excellent with no
[UNCLEAR: noticeable] diseases occurring. One casualty was treated in a commendable
manner by the Chief Pharmacist's Mate. NARDEI, Carl George, 821-77-08, CPhM2c.(T),
while greasing #1 periscope, had his hand around the cable to lower
it. The man on periscope watch, not noticing this, raised the periscope
and caught NARDEI's middle and ring fingers of the left hand. Wound was
thoroughly washed with soap and water. He was given 7½ grains of Sodium Pentothal.
Wound was abraded, undermined, and sutured. Sulfathiazol crystals were
sprinkled on the wound and dressed with Sulfathiazol gauze and bandage. Treatment
proved satisfactory and no infection set in.

The food, in both quality and quantity, was more than satisfying. The out-
standing bakery products turned-out by ADAMS, Bkrlc., daily, disappeared
in record time. In addition to the usual good menu, in addi-
tion to the baking, fruit juices, canned fruit, fresh eggs and pork sau-
sage with relish, and by the end of a month, we were getting low on these
items. Australian apple juice disappeared most rapidly.

At no time throughout the patrol were there evidences of the boat
lacking in comfort. The air conditioning functioned reasonably well,
was ample fresh water, and the ice cream freezer, only once, gave up and quit.
No vermin life was found on the boat even though we had no opportunity to fumi-
gate before the start of the run.

- 24 -

— page 233 —
C-O-N-F-I-D-E-N-T-I-A-L
                                                U.S.S. GUITARRO
                                                                      Fifth War Patrol

Q. PERSONNEL

    All officers and men were in a good state of training before and during
    the patrol. The periods enroute to and from patrol area were devoted to radar
    training; fire control and gunnery drills; qualification of personnel; and
    training of officer personnel. All hands performed their duties in a highly
    satisfactory manner.

    (a) Number of men on board during patrol                 75
    (b) Number of men qualified at start of patrol           56
    (c) Number of unqualified men making first patrol        11
    (d) Number of men qualified at end of patrol             66
    (e) Number of men advanced in rating during patrol        3
    (f) Number of men detached after previous patrol         13

R. MILES STEAMED - FUEL USED

    Fremantle to Area         1959.0 miles      19,835 gals.
    In Area                   7319.2 miles      78,489 gals.
    Area to Pearl Harbor      5358.7 miles      69,541 gals.

S. DURATION

    Days enroute to area       7
    Days in area              37
    Days enroute to base      17
    Days submerged            23

T. FACTORS OF ENDURANCE REMAINING

    Torpedoes         Fuel             Provisions       Personnel
    16                8,000 gals.      10 days          10 days

    Limiting factors this patrol - Patrol terminated by orders and
                                   lack of fuel.

U. RADIO AND RADAR COUNTERMEASURES

    See pages 26 - 32, inclusive, of this report.

                                   - 25 -

— page 234 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

V. REMARKS

It is of interest to note from patrol reports and our own experience the
indicated use of single torpedoes by the Japanese against our own submarines.
The USS LAGARTO whom we relieved in the TONKIN GULF Area reported to us that
she had experienced two possible attacks of this nature and the USS TIGRONE
reported one attack to the East of HAINAN ISLAND. We should be foolish to be-
lieve that single torpedoes are the rule but they do indicate the possible
presence of small submarines to the exclusion of the larger fleet type for
anti-submarine work. And, since the attacks are within easy range of known
Japanese held ports, it is quite possible that these submarines operate out
the entire time out of port. Our own experience leads me to
believe that a submarine of this type was used in coordination with aircraft.

Along the coast of HAINAN traffic is apparently running only during day-
light and then up and down the West coast. Due to the shallow water, no
favorable positions for attack or observation of this traffic were obtained
along the East coast. The possible exception at the northern tip of HAINAN
ISLAND is well within the blind bombing zone. It will be necessary to lift
this bombing restriction if the Japs are to be intercepted during daylight.
Although close inshore patrol was maintained during daylight along the
East coast and along both coasts at night, no contacts worthy of torpedo
fire were encountered.

- 25a -

— page 235 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

U. RADIO AND RADAR COUNTERMEASURES

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or station U.S.S. GUITARRO (SS363)

2. Area covered on this mission (give dates) Lat. 18-00N; Long. 109-21E;
   25 April 1945.

3. Was enemy radar:
   Shipborne ______ Airborne ______ Landbased X Unknown ______
   (a) Describe enemy installation Directional antenna sweeping at slow
       speed.

4. Intercept Equipment APR-1 AN/APA-1 (TN-2 band).

5. (a) Frequency 187 Mc Dial readings 187
   (b) PRF 1150 - 1250 How measured PRF meter.
   (c) Pulse width 10 - 15 Ms How measured CRT calibration.
   (d) Sketch pulse
   [HANDWRITTEN: 10-15Ms]
   (e) Was Lobe Switching Used No Rate --- How determined Not deter.
   (f) Polarization of enemy signal Horizontal
   (g) Sweep rate Varied from 1 - 4 RPM.

6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI
       Early warning air search or AAFC.
   (b) Evidence for this conclusion Signal intensity did not change and
       even fluctuation of signal apparently denoted a fixed radar.

8. Narrative:

   This unit appeared to be the most common type of radar used in the area
   and appeared to be Mk 21, AAFC located near SAKAI BAY. It was in operation
   for approximately two and a half hours every night from 2130 to 2400.

- 26 -

— page 236 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol
U. RADIO AND RADAR COUNTERMEASURES (Cont.)

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or station U.S.S. GUITARRO (SS363)

2. Area covered on this mission (give dates) Lat. 18-00N; Long. 109-00E;
   25 April 1945.

3. Was enemy radar:
   Shipborne ______ Airborne X Landbased ______ Unknown ______
   (a) Describe enemy installation Unknown.

4. Intercept Equipment APR-1 AN/APA-1 (TN-2 Band).

5. (a) Frequency 175 Mc Dial Readings 175
   (b) PRF 250 How measured PRF meter
   (c) Pulse Width 7.5 Ms How measured Calibration on CRT
   (d) Sketch pulse
   [HANDWRITTEN: (sketch of a pulse waveform)]
   [HANDWRITTEN: -15-]

   (e) Was lobe switching used Unknown Rate -- How determined --
   (f) Polarization of enemy signal Horizontal.
   (g) Sweep Rate Not sweeping.

6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI
   Surface search.
   (b) Evidence for this conclusion Seemed to be coming from aircraft.

7. Action of enemy radar, including distances and bearings at which he
   searched, tracked, faded, etc. Signal coming from direction of
   MAINLAND - seemed to be keyed. No radar contact on aircraft.

8. Narrative:

   This radar was definitely established as airborne on the night of 2 May
   1945 when the signal of E-5 strength was picked up on the starboard bow or
   seaward side of the ship. Radar contact at 10,000 yards was established ap-
   proximately five minutes later. This radar was contacted six evenings for
   short periods during moonlight nights when visibility was good.

- 27 -

— page 237 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

U. RADIO AND RADAR COUNTERMEASURES

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or station U.S.S. GUITARRO (SS363)
2. Area covered on this mission (give dates) Lat. 18-41N; Long. 110-34E;
   26 April 1945.
3. Was enemy radar:
   Shipborne ______ Airborne ______ Landbased X Unknown ______
   (a) Describe enemy installation Shore based installation as signal
   came from HAINAN. Not sweeping.
4. Intercept Equipment APR-1 AN/APA-1 (TN-2 band).
5. (a) Frequency 95 Mc Dial Readings 95
   (b) PRF 500 How measured PRF meter.
   (c) Pulse width 5 Ms How measured Calibration on CRT.
   (d) [HANDWRITTEN: ]
   (e) Lobe Switching Used Unknown Rate ---- How determined ----
   (f) Polarization of enemy signal Horizontal.
   (g) Sweep Rate No apparent sweep rate.
6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI
   Early warning air search.
   (b) Evidence for this conclusion Only used during darkness.
7. Action of enemy radar, including distances and bearings at which he
   searched, tracked, faded, etc. Apparently beamed toward sea - signal
   strength remained constant throughout period of operation.
8. Narrative:
   This was another radar continually encountered during the patrol period
   and appeared to be the Mk 11 type. Pulse widths ranging from 5 - 25 Ms
   and frequencies from 90 to 102 Mc were denoted on different nights of operation.
   This unit was usually in operation from twilight to approximately 0300 and
   appeared to be beamed from YULIN or SAVAH BAY.

- 28 -

— page 238 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

U. RADIO AND RADAR COUNTERMEASURES (Cont.)
INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or station U.S.S. GUITARRO (SS363).

2. Area covered on this mission (give dates) Lat. 18-00N; Long. 110-00E
   1 May 1945.

3. Was enemy radar:
   Shipborne _____ Airborne _____ Landbased X Unknown _____
   (a) Describe enemy installation Steady signal - on for approximately
       2.5 hours after darkness. Did not appear to be sweeping.

4. Intercept equipment APR-1 AN/APA-1 (TN-2 band).

5. (a) Frequency 149 Mc Dial readings 149
   (b) PRF 500 How measured PRF meter.
   (c) Pulse width 13 Ms How measured Calibration on CRT.
   (d) Sketch pulse
       [HANDWRITTEN: A drawing of a pulse shape, roughly rectangular with rounded top corners and a slight dip in the middle of the top.]

   (e) Was Lobe Switching Used Unknown Rate -- How determined --
   (f) Polarization of enemy signal Horizontal
   (g) Sweep rate No apparent sweep rate.

6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI
       It appeared to be used for AS. Signal came from HAILU ISLAND.
   (b) Evidence for this conclusion Determination of direction of signal
       and constant signal strength.

7. Narrative:
   Radar was apparently of Mk 12K or Mk 13 type as frequency varied from
   145 to 151 Mc and pulse width from 10 to 13 Ms. Signal definitely came from
   the area of SAMAH BAY. This unit was in operation six times during the
   patrol period.

- 29 -

— page 239 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol
U. RADIO AND RADAR COUNTERMEASURES (Cont.)

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or station U.S.S. GUITARRO (SS363)

2. Area covered on this mission (give dates) Lat. 18-00N; Long. 110-00E.
   12 May 1945.

3. Was enemy radar:
   Shipborne ______ Airborne ______ Landbased X Unknown ______
   (a) Describe enemy installation Directional antenna - sweeping at slow
   rate of speed.

4. Intercept Equipment AFR-1 AN/APA-1 (TN-2 band).

5. (a) Frequency 128 Mc Dial readings 128
   (b) PRF 1250 How measured PRF meter.
   (c) Pulse width 10 Ms How measured Calibration on CRT.
   (d) Sketch pulse

   (e) Was lobe switching used Unknown Rate --- How determined ---
   (f) Polarization of enemy signal Horizontal.
   (g) Sweep rate 1 - 3 RPM.

6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI
   AS Signal coming from HAINAN ISLAND.
   (b) Evidence for this conclusion Direction determined on directional
   for approximately one hour.

8. Narrative:

This radar was encountered on only two evenings and the type could not be
identified although the signal definitely came from the southern coast of
HAINAN ISLAND.

- 30 -

— page 240 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol
U. RADIO AND RADAR COUNTERMEASURES (Cont.)

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or station U.S.S. GUITARRO (SS363)

2. Area covered on this mission (give dates) Lat. 18-00N; Long. 110-00E;
13 May 1945.

3. Was enemy radar:
Shipborne Airborne Landbased Unknown X
(a) Describe enemy installation Directional beam coming from HAINAN
ISLAND.

4. Intercept Equipment APR-1 AN/APA-1 (TN-2 band)

5. (a) Frequency 298 Mc Dial readings 298
(b) PRF 500 How measured PRF meter.
(c) Pulse width 8 Ms How measured Calibration on CRO.
(d) Sketch pulse [DRAWING: pulse shape]

(e) Was lobe switch used Unknown Rate -- How determined --
(f) Polarization of enemy signal Horizontal
(g) Sweep rate Approximately 2 RPM.

6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI
Unknown.

7. Action of enemy radar, including distances and bearings at which he
searched, tracked, faded, etc. Signal on for approximately 1.5 hours.
E-1 strength.

8. Narrative:

This signal was encountered on three successive nights from May 13 on and
although weak, was definitely of the radar type. It appeared to be beamed
from the southeastern tip of HAINAN ISLAND.

- 31 -

— page 241 —
C-O-N-F-I-D-E-N-T-I-A-L U.S.S. GUITARRO Fifth War Patrol

U. RADIO AND RADAR COUNTERMEASURES (Cont.)

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or station U.S.S. GUITARRO (SS363)

2. Area covered on this mission (give dates) Lat. 21-30N; Long. 121-00E;
   21 May 1945.

3. Was enemy radar:
   Shipborne ______ Airborne ______ Landbased X Unknown ______
   (a) Describe enemy installation Steady signal of E-4 strength,
   sweeping at a rapid rate - approximately 6 RPM.

4. Intercept Equipment APR-1 W/AFA-1 (TM-2 band).

5. (a) Frequency 80 Mc Dial readings 80
   (b) PRF 500 How measured PRF meter.
   (c) Pulse width 15 Ms How measured Calibration on CRT
   (d) Sketch pulse

   (e) Was Lobe Switching Used Unknown Rate --- How determined ---
   (f) Polarization of enemy signal Horizontal.
   (g) Sweep rate Approximately 6 R.P.M.

6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI
   Apparently for early warning air search.
   (b) Evidence for this conclusion Maximum signal intensity constant
   of directional type - sweeping through 360°. Approximately 60
   miles from source during E-5 signal reception.

8. Narrative:

   This signal was encountered at 1400 in clear weather during transit of
   BASHI CHANNEL and appeared to be beamed from GARANBI or KOTO SHO. Possibly
   the NK CHI. Signal strength was E-5 and rapidly fluctuating. Sighted air-
   craft coming from that direction approximately 15 minutes later.

- 32 -

— page 242 —
FIRST ENDORSEMENT to CO USS GUITARRO
Conf ltr SS363/A16-3 Serial (02),
dated 8 June 1945.

FB5-104/A16-3(2) Serial (010)
C-O-N-F-I-D-E-N-T-I-A-L

From: The Commander Submarine Division ONE HUNDRED FOUR.
To : The Commander in Chief, UNITED STATES FLEET.
Via : (1) The Commander Submarine Squadron TEN.
(2) The Commander Submarine Force, PACIFIC FLEET.
(3) The Commander-in-Chief, U.S. PACIFIC FLEET.

Subject: U.S.S. GUITARRO - Report of War Patrol Number FIVE.

1. The Fifth War Patrol of GUITARRO was conducted in the TONKIN GULF
area. This patrol was of sixty-one (61) days duration.

2. A special mission was accomplished which is covered by separate
top secret correspondence.

3. The assigned patrol area was thoroughly covered despite shallow
waters and the poorly charted coastlines of southern HAINAN ISLAND with soundings
admittedly inaccurate.

4. No contacts were made worthy of torpedo fire. There were indica-
tions that what little traffic there may be along this coast follows the shore-
line so closely that submarine operations are not feasible in the poorly charted
shallow waters existing.

5. The GUITARRO will proceed to the west coast for modernization where
all material defects will be remedied.

6. The Administrative Division Commander congratulates the Commanding
Officer, officers, and crew of GUITARRO upon the completion of this long and ard-
uous patrol; it is hoped that upon return from overhaul more targets will be
available.

SUBMARINE DIVISION ONE HUNDRED FOUR,
Care of Fleet Post Office,
San Francisco, California.

9 June 1945.

[SIGNATURE: Lowell T. Stony]
LOWELL T. STONY.

— page 243 —
SUBMARINE SQUADRON TEN
Fleet Post Office
San Francisco, California
11/rhb

FC5-10/A16-3
Serial: 083
10 June 1945
C-O-N-F-I-D-E-N-T-I-A-L
SECOND ENDORSEMENT to
U.S.S. GUITARRO (SS363)
Report of Fifth War Patrol.

From:         The Commander Submarine Squadron TEN.
To:           The Commander-in-Chief, UNITED STATES FLEET.
Via:          (1) The Commander Submarine Force, PACIFIC
              FLEET, Administration.
              (2) The Commander-in-Chief, U.S. PACIFIC FLEET.

Subject:      U.S.S. GUITARRO (SS363) - Report of Fifth
              War Patrol.

1.            Forwarded, concurring in the remarks of the
Commander Submarine Division ONE HUNDRED FOUR.

2.            The Squadron Commander congratulates the
Commanding Officer, officers, and crew of the U.S.S. GUITARRO
upon completion of that vessels' Fifth War Patrol.

[SIGNATURE: G. E. Peterson]
G. E. PETERSON.

— page 244 —
[STAMP: 6 0553]
FF12-10(A)/A16-3(18)
Serial 01466
CONFIDENTIAL

SUBMARINE FORCE, PACIFIC FLEET
Care of Fleet Post Office,
San Francisco, California.
15 June 1945

Ga.

THIRD ENDORSEMENT to
GUITARRO Report of
Fifth War Patrol.

NOTE: THIS REPORT WILL BE
DESTROYED PRIOR TO
ENTERING PATROL AREA.

COMSUBSPAG PATROL REPORT NO. 785
U.S.S. GUITARRO - FIFTH WAR PATROL.

From: The Commander Submarine Force, Pacific Fleet.
To : The Commander in Chief, United States Fleet.
Via : The Commander in Chief, U. S. Pacific Fleet.

Subject: U.S.S. GUITARRO (SS363) - Report of Fifth War Patrol
(9 April to 8 June 1945).

1. The fifth war patrol of the GUITARRO, under the command of Commander
T. S. Dabney, U. S. Navy, was conducted in the Tonkin Gulf.

2. Although area coverage was thorough, no contacts worthy of torpedo
or gun fire were encountered. Enroute to area the GUITARRO expeditiously
accomplished a special mission.

3. Award of Submarine Combat Insignia for this patrol is authorized.

4. The Commander Submarine Force, Pacific Fleet, welcomes the GUITARRO
to the Submarine Force, Pacific Fleet, and congratulates the commanding
officer, and crew upon the completion of this patrol and upon the accomplishment
of her special mission.

E. E. YEOMANS.

DISTRIBUTION:
(Complete Reports)
Cominch (7)
CNO (5)
Cincpac (6)
JICPOA (1)
AdICPOA (1)
Comservpac (1)
Cinclant (1)
Comsublant (8)
S/M School, New London, Conn. (2)
CO, S/M Base, Pearl Harbor, TH (1)
Consopac (2)
Consovespac (1)
Comsubs7thflt (Fwd Echelon) (2)
Comsubs7thflt (Rear Echelon) (2)
Comnorpac (1)
Comsubspac (3)
ComsubspacSubordcom (40)

SULAD, MI (2)
ComsubspacSubordcom (3)
All Squadron and Div. (3)
Commanders, Pacific (2)
Substrainpac (2)
All Submarines, Pacific (1)

[SIGNATURE: W. S. Langley]
W. S. LANGLEY,
Asst. Flag Secretary.

EXTRA - ORIGINAL
SORG. MICRO
PHOTO-LAB OP-16
RETURN TO F-4253

— page 245 —
END OF REEL
JOB NO. [HANDWRITTEN: 7-108]
[HANDWRITTEN: AR-125-98]

||||| 1.0
||||| 1.1
||||| 1.25 ||||| 1.4 ||||| 1.6

||||| 2.8 ||||| 2.5
||||| 3.2 ||||| 2.2
||||| 3.6 ||||| 2.0
||||| 4.0 ||||| 1.8
||||| 4.5
||||| 5.0

THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

[SEAL: DEPARTMENT OF DEFENSE, UNITED STATES OF AMERICA, with an eagle]

MICROFILMED BY
NPPSO-NAVAL DISTRICT WASHINGTON
MICROFILM SECTION

— page 246 —
START OF REEL
[HANDWRITTEN: AR-88-81]
JOB NO. [HANDWRITTEN: E-108]

[TYPED: 1.0]
[TYPED: 1.1]
[TYPED: 1.25] [TYPED: 1.4] [TYPED: 1.6]

[TYPED: 2.8] [TYPED: 2.5]
[TYPED: 3.2] [TYPED: 2.2]
[TYPED: 3.6] [TYPED: 2.0]
[TYPED: 4.0]

OPERATOR [SIGNATURE: L. Frye]
DATE [HANDWRITTEN: 8-31-81]

THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

[SEAL: DEPARTMENT OF DEFENSE UNITED STATES OF AMERICA]

MICROFILMED BY
NPPSO-NAVAL DISTRICT WASHINGTON
MICROFILM SECTION

REEL TARGET - START AND END
NDW-NPPSO-5210/1 (6-78)

— page 247 —
[HANDWRITTEN: NRS 1978-42]

[HANDWRITTEN: GUITARRO (SS-363)]
[HANDWRITTEN: WORLD WAR II REPORT FILE]

[HANDWRITTEN: ALL MATERIAL ON THIS REEL IS DECLASSIFIED]

[HANDWRITTEN: FOR DECK LOG JANUARY 1944 - DECEMBER 1945]
[HANDWRITTEN: CONSULT NATIONAL ARCHIVES WHICH HAS CUSTODY.]

[HANDWRITTEN: 35 MM]

— page 248 —
DATE 29 May-6 June 1944 NAME GUITARRO
FROM CROSS INDEX CARD SERIAL
DATE
SUBJECT Coordinated Patrol Report
Report of FIFTH Coordinated Attack Group under Cdr.F.W.
Fenno (FENNO'S FERRETS) in SOUTH CHINA SEA. Sank or
damaged 39,700 tons of enemy shipping.

FILED: War Diary
Separately under TASK GROUP 17.14 no ser of no date

MICROSERIAL NO. ACTION REPORT OPNAV FORM 3840-13 (10-55)
B-31013

UNCLASSIFIED A
DATE 7-30 August 1944 NAME GUITARRO
FROM CO - USS GUITARRO (SS-363)
SERIAL 036
DATE 8 September 1944
SUBJECT Coordinated Attack Group Patrol, Report of
Narrative report of operations of USS GUITARRO (SS-363), USS
RATON (SS-270), & USS BREAM (SS-243) in PHILIPPINE ISLANDS.
Five enemy ships sunk & three damaged by submarines; but
no coordinated attacks were conducted. (SOMESPAC: US SUB OPS
FILED: War Diary
Separately as ORIGINAL; as AUTOTAT(0)

MICROSERIAL NO. ACTION REPORT OPNAV FORM 3840-13 (11-55)
B-38083

DATE 30 Oct-7 Nov 1944 NAME GUITARRO
FROM CROSS INDEX CARD SERIAL
DATE
SUBJECT Coordinated Patrol Report
Report of Coordinated Patrol of USS BREAM, USS RATON & USS
GUITARRO off Luzon coast between Manila Bay & Cape Bolinao.
Three coordinated attacks resulted in sinking or damage to
55,700 tons of enemy shipping.
FILED: War Diary
Separately under BREAM ser 020-44 of 18 Nov 44

MICROSERIAL NO. ACTION REPORT OPNAV FORM 3840-13 (11-55)
B-38083

— page 249 —
DATE 29 May - 6 June 1944
FROM CROSS INDEX CARD

SUBJECT Coordinated Patrol Report

Report of FIFTH Coordinated Attack Group under Cdr.F.W.
Fenno (FENNO'S FERRETS) in SOUTH CHINA SEA. Sank or
damaged 39,700 tons of enemy shipping.

FILED: War Diary
Separately under TASK GROUP 17.14 no ser of no date

MICROSERIAL NO.

UNCLASSIFIED
DATE 7-30 August 1944
FROM CO - USS GUITARRO (SS-363)

SUBJECT Coordinated Attack Group Patrol, Report of

Narrative report of operations of USS GUITARRO (SS-363),
USS RATON (SS-270) & USS BREAM (SS-243) in PHILIPPINE ISLANDS.
Five enemy ships sunk & three damaged by submarines; but
no coordinated attacks were conducted. (SOMESPAC: US SUB OPS
FILED: War Diary
Separately as ORIGINAL; as AUTOSAT(0)

MICROSERIAL NO.

DATE 30 Oct - 7 Nov 1944
FROM CROSS INDEX CARD

SUBJECT Coordinated Patrol Report

Report of Coordinated Patrol of USS BREAM, USS RATON & USS
GUITARRO off Luzon coast between Manila Bay & Cape Bolinao.
Three coordinated attacks resulted in sinking or damage to
55,700 tons of enemy shipping.
FI

— page 250 —
DATE 20 April 1945
FROM CO - USS GUITARRO (SS-363)
SERIAL 0001
DATE 20 April 1945

SUBJECT Mine Laying Report

Report of laying of field of 23 MARK 12 mines off Sumatra.
Narrative report (to TG 71.4) of successful mine plant
on FIFTH WAR PATROL.
(SOWESPAC: SUL OPS)
FILED: War Diary

Separately as ORIGINAL CARBON COPY

MICROSERIAL NO.
ACTION REPORT OPNAV FORM 3980-13 (11-53)

— page 251 —
[STAMP: DECLASSIFIED I-A-L]
[HANDWRITTEN: Photostat (2)]

From: Commander Task Group 17.14.
To : Commander U.S. Fleet.
Via : (1) Commander Pacific Fleet.
(2) Commander Submarine Force Pacific Fleet.
Subject: Patrol Report of Commander Task Group 17.14.

Reference: (a) ComSubPacs' Operation Order No. 146-44.
(b) ComSubPacFor Coordinated Attack Doctrine.
(c) Second War Patrol Report of U.S.S. PICUDA.
(d) First War Patrol Report of U.S.S. PERCH.
(e) Sixth War Patrol Report of U.S.S. PETO.
(f) First War Patrol Report of U.S.S. GUITARRO.

No attempt will be made in this report to cover the patrols of
individual boats in the group as that is accomplished in the above references.
The following is submitted from the point of view of the Task Group Commander
on the operation of the group as a wolf pack.

In accordance with Commander Task Force Seventeen Secret Operation
Order No. 146-44 the U.S.S. PETO and PERCH departed Pearl Harbor at 1330
28 April 1944. Enroute Midway these boats exercised at communication drills
and individual training. Arrived Midway at 0800 2 May 1944 where U.S.S. PICUDA
joined the group. May 2nd was devoted to instruction in doctrine and procedure
for the patrol. May 3rd 1944 exercised all boats in communications attack
doctrine and patrol procedure. At 1330 4 May departed Midway for patrol area,
Group Commander in U.S.S. PICUDA. U.S.S. PERCH had Doctor Ramey on board for
further transfer to the U.S.S. HALIBUT at rendezvous Northeast of Marcus Island.

- 1 -
[HANDWRITTEN: (4)]

— page 253 —
- Transkription

C-O-N-F-I-D-E-N-T-I-A-L

Subject: Patrol Report of Commander Task Group 17.14. (cont'd).

— page 255 —
C-O-N-F-I-D-E-N-T-I-A-L
Subject: Patrol Report of Commander Task Group 17.14 (cont'd).

and up the East Coast of Taiwan close to the shore. 29th effected rendezvous
with GUITARRO at 0400. Both subs were early. PICUDA obtained CSP-1500 and
departed for Bashi Channel. 30th Proceeded to patrol along 100 fathom curve
to westward with both boats. 31st Received orders from ComSubPac to rendezvous
with GUITARRO again at Lat. 23° - 00' N. 123° E. Ordered PETO to proceed to
rendezvous at flank speed. During forenoon PICUDA was held down by planes. On
surfacing learned PETO had had a contact but had lost it. Ordered her to proceed
to 21 N. 125° - 10 E. as she could not make rendezvous from her position on time
and her fuel was low. At 0430 June first PICUDA and GUITARRO met at rendezvous.
GUITARRO reported sinking large AK during the night. Gave the GUITARRO communi-
cation plan and checked her transmitter and receivers on 450 KC, CW, and 2204 KC
Voice. Ordered GUITARRO and PICUDA to proceed at flank speed to Lat. 23° - 10'N.
Long. 126° - 50' E. to patrol to the
northeast distance between submarines
twenty miles. At 0100 June 2nd
dered GUITARRO and PICUDA to proceed at flank speed on course 235 to Lat. 22° -
15' N. Long. 121° - 20'E. and ordered PETO to proceed to Lat. 21° -25' N. Long.
121° - 15' E. At 1900 ordered PETO to patrol to northward eight miles from east
coast of Taiwan, PICUDA to patrol north 22 miles off coast and GUITARRO to patrol
35 miles off coast on northerly course. At midnight PICUDA made radar contact
with convoy at 17,000 yards and sent out contact report giving position, course
and speed of convoy. All boats acknowledged for it. At 0143 PICUDA made Sub-
merged moonlight attack and fired six torpedoes four at the largest ship in sight
and two at the ship following it. Range was about 2500 yards. Two hits were
heard in the first ship and one in the second. While PICUDA was swinging to fire
[HANDWRITTEN: (8)] - 5 -

— page 259 —
C-O-N-F-I-D-E-N-T-I-A-L
Subject: Patrol Report of Commander Task Group 17.14 (cont'd).

daylight by a concerted depth charge attack. It is believed that the GUITARRO
may have gotten in a night surface attack just before daylight, but she was also
                                                              was
forced down at daylight, as/apparently the PETO. All boats were held down during
the day by air coverage and the convoy thus able to get away. Under the circum-
stances of location it is felt that the position selected for attack was the best
available to the wolf pack even though only one attack per boat could be expected.

Anti-Submarine measures encountered on this patrol were in keeping with
what had been experienced in the past. Convoys have plenty of escorts which are
usually Chidori class torpedo boats and destroyers if the size of the convoy
warrants that much protection. Large convoys are employing escort carriers in
order to obtain thorough air coverage. In area 11 D there is considerable air
coverage particularly in the Bashi Channel, vicinity of Takao and Aparri. Planes
were sighted daily and submarines forced down several times during the day and
night. Night air patrols were much more numerous during the period of bright
moonlight. It is possible that some of these night air patrols are radar equip-
ped. The PICUDA sighted a plane at 0300 one morning and dived, she surfaced at
0345. At 0400 the plane came in on the SD radar from 10 to 5 miles at which
point she dived again. However this sort of thing has to be expected nowadays.

At no time during this patrol was the PICUDA actually picked up by echo
ranging escorts until torpedoes had been fired. She was sighted once however.

All submarines in this group cooperated one hundred percent and the Group
Commander wishes to take this opportunity to express his appreciation to the
Commanding Officers, Officers and Crews of the PICUDA, PERCH, PETO and GUITARRO
for exerting their best efforts during this patrol.

Inasmuch as the destination of all four boats at the end of their patrol

[HANDWRITTEN: 124]
- 9 -

— page 261 —
FF2-10/A16-3(15)/(16)
Serial 01375 [HANDWRITTEN: O.K.]
[HANDWRITTEN: r]
CONFIDENTIAL

FIRST ENDORSEMENT to
Patrol Report of Fifth
Coordinated Attack Group.

From: The Commander Submarine Force, Pacific Fleet.
To : The Commander-in-Chief, United States Fleet.
Via : The Commander-in-Chief, U. S. Pacific Fleet.

Subject: Patrol Report of Commander Task Group 17.14.

1. This, the fifth coordinated attack group, conducted
its patrol in the South China Sea around Formosa.

2. The group consisted of the U.S.S. PICUDA (SS382),
the U.S.S. PERCH (SS313), and the U.S.S. PETO (SS265) with the group
commander embarked in the PICUDA. The PERCH was forced to leave the
attack group shortly after entering the area due to material difficul-
ties. She was replaced by the U.S.S. GUITARRO (SS363).

3. Although considerable damage was inflicted on the
enemy, only one coordinated attack took place by the PICUDA and GUI-
TARRO on 2 June. This attack resulted in the sinking of a freighter
and a tanker and the damaging of an additional freighter. Later on
the night of June 2-3 the GUITARRO sunk one of two destroyers, ap-
parently sent out on an anti-submarine mission.

4. The coordinated attack group was somewhat handicapped
by enemy air coverage which prohibited the coordination of attack
once contact was established by any one of the attack group. The at-
tack group was also broken up on two occasions when submarines were
detached to search for downed Army aviators.

5. Of note is the fact that the Japanese may be employ-
ing escort carriers for anti-submarine protection to help protect
large convoys.

6. The coordinated attack group is credited with having
inflicted the following damage upon the enemy:

S U M M A R Y

By the PICUDA:
1 - Passenger Freighter (class unknown) - 7,000 tons
1 - Freighter (class unknown) - 5,000 tons
1 - Escort Vessel (class unknown) - 1,000 tons
By the GUITARRO:
1 - Tanker (NISSHO MARU class) - 10,500 tons
1 - Destroyer (MINEKAZE class) - [HANDWRITTEN: 1,200 tons]
TOTAL SUNK 24,700 tons

[HANDWRITTEN: (2)]
- 1 -
7 03660 [HANDWRITTEN: F4753.]
SUBMARINE FORCE, PACIFIC FLEET [HANDWRITTEN: mr]

Care of Fleet Post Office,
San Francisco, California,
9 July 1944.

NOTE: THIS REPORT WILL BE
DESTROYED PRIOR TO
ENTERING PATROL AREA.

— page 262 —
FF12-10/A16-3(15)/(16)
Serial 01375

CONFIDENTIAL

FIRST ENDORSEMENT to
Patrol Report of Fifth
Coordinated Attack Group.

Subject: Patrol Report of Commander Task Group 17.14.

DAMAGE

By the PICUDA:
1 - Freighter (class unknown) - 10,000 tons

By the PERCH:
1 - Tanker (class unknown) - 5,000 tons
TOTAL DAMAGED 15,000 tons
GRAND TOTAL 39,700 tons

Note: The PERCH also sank a 9,500 ton freighter prior
to joining the attack group.

7. The Commander Submarine Force, Pacific Fleet, con-
gratulates the Coordinated Attack Group Commander and the submarines
in the attack group for inflicting severe damage on the enemy.

J. H. BROWN, Jr.

DISTRIBUTION:
(Complete Reports)
Cominch (7)
CNO (5)
Cincpac (6)
Intel.Com.Pac.Ocean Areas (1)
Comservpac (1)
Cincant (1)
Comsublant (8)
S/M School, NL (2)
Comsopac (2)
Comsowespac (1)
Comsubsowespac (2)
CTF 72 (2)
Comnorpac (1)
Com

— page 263 —
[HANDWRITTEN: 303]
[STAMP: DECLASSIFIED]SS363/A4
Serial 036

[HANDWRITTEN: Original Card 8-3-51, of W]

U.S.S. GUITARRO
Fleet Post Office
San Francisco, Calif.

8 September 1944.

From: The Commanding Officer.
To : The Commander in Chief, United States Fleet.
Via : Official Channels.

Subject: Narrative report covering co-ordinated search and
attack. [HANDWRITTEN: (Area West of Luzon and Mindoro; 7 Aug - 30 Aug. 1944)]

Enclosure: (A) Subject report.
(B) Track chart (original only).

1. Enclosures (A) and (B), covering the co-ordinated
search and attack unit consisting of GUITARRO and RATON, with
later addition of TUNNEL, in the areas to the west of LUZON and
MINDORO during the period 7 August 1944 to 30 August 1944 are
forwarded herewith.

E. D'H. HASKINS.

— page 264 —
CONFIDENTIAL

USS GUITARRO, Co-ordinated Search and Attack Report.

(A) PROLOGUE.

                                    This submarine attack unit was comprised of the USS
                                    RATON and USS GUITARRO under the command of Commanding
                                    Officer GUITARRO. Later, after RATON had left area,
                                    USS GUNNEL joined up for two days at the expiration of which
                                    time GUITARRO departed area. The RATON departed FRE-
                                    MANTLE, W.A. on 17 May 1944, and the GUITARRO on 21
                                    July 1944. Unit was formed on arrival of GUITARRO
                                    in area, which was off the west coasts of LUZON and
                                    MINDORO.

(B) NARRATIVE.

                                    7 August

0225 (H) GUITARRO entered area. Attempted to establish commun-
         ication with RATON unsuccessfully.

                                    8 August

                                    GUITARRO unable to reach previously designated ren-
                                    dezvous due to attack on convoy. Had difficulty
                                    establishing radio communication with RATON due to
                                    jamming, so sent message blind establishing scouting
                                    line off POINT BOTOLAN. This message not received by
                                    RATON.

                                    9 August

2100 (H) Established satisfactory radio communication by key on
         2680 kcs. and scouting line off POINT BOLINAO. Attack
         unit formed. Night plan consisted of East - West patrol
         line with RATON, who reported radar temporarily out of
         commission. 5 - 7 - 10 miles offshore, ship movements on
         Speed 9.
         Day plan moved both submarines close inshore submerged,
         RATON north of Lat. 16°-20'N., GUITARRO south of same
         line.

                                    10 August

1029 (H) GUITARRO made torpedo attack on north bound convoy
         scoring one, possibly two, hits in KATORI class CL and [HANDWRITTEN: ??]
         one hit in a medium AK.

                                    - 1 -

                                    ENCLOSURE (A)

— page 265 —
CONFIDENTIAL

U.S.S. GUITARRO, Co-ordinated Search and Attack Report.

10 August

1237 (H) GUITARRO made torpedo attack on searching HIBIKI class
destroyer, scoring two hits and sinking it.
Sent message to make attack later reported she was
chasing convoy to north.
2150 (H) Sent message to RATON to rendezvous when able at Lat.
15°N., Long. 116°E. GUITARRO proceeding to rendezvous
point.
This submarine attack unit shifted areas to west in
accordance with COMMANDER TASK FORCE SEVENTY-ONE Oporder

11 August

Shifting areas.

12 August

0600 (H) Effected rendezvous with RATON. Exchanged information
and established scouting line on East - West line cover-
ing MANILA - SINGAPORE trade routes. Surface patrol.

13 August

2030 (H) Effected rendezvous with RATON. Established search line
while proceeding to east for special mission.
2056 (H) Special mission cancelled. Ordered RATON to resume
former patrol station.

14 August

0200 (H) GUITARRO arrived on station. Scouting line re-estab-
lished.
1946 (H) Ordered new patrol line 180 miles to north to cover
EMPIRE - SINGAPORE trade routes.
2000 (H) Executed above message and proceeded north on search
line.

15 August

1310 (H) GUITARRO arrived at point of origin. New scouting line
established on patrol line 300°-120° T.

- 2 -

ENCLOSURE (A)

— page 266 —
CONFIDENTIAL
U.S.S. GUITARRO, Co-ordinated Search and Attack Report.

16 August
Uneventful surface patrol.

17 August
0645 (H) Proceeded to south on scouting line with RATON. This
unit due to shift areas on 18 August, and it was desired
to cover MANILA -- SINGAPORE routes while shifting.

18 August
0516 (H) Effected rendezvous with RATON. Proceeded to east on
scouting line that shifting areas, headed for patrol
station off CAPE CALAVITE, in accordance with COMMANDER
TASK FORCE SEVENTY-ONE serial.
2245 (H) Received RASHER contact report (RASHER Serial ).
From available information it was determined that
HARDER's wolf pack could not be in their area yet so
decided to take advantage of an empty area with a convoy
coming through it. Ordered RATON to patrol submerged
tomorrow off CAPONE ISLAND. Ordered GUITARRO to take submerged
patrol off BOTOLAN POINT. Both close inshore.

19 August
2145 (H) With failure of convoy to appear decided to clear
HARDER's area and form scouting line as originally
planned. Ordered RATON to assigned station off CAPE
CALAVITE.

20 August
On station off CAPE CALAVITE. At night an East - West
patrol line was formed GUITARRO at point of origin 10
miles offshore, RATON 25 miles offshore. Movements along
line synchronized, speed 10 knots. Day stations submerged
close inshore GUITARRO south of Latitude 13°-27'N.
RATON north of same line.

21 August
055 (H)(about) A submarine (believed to be the RAYO) attacked a
north bound convoy.
0619 (H) A submarine (believed to be the HADDO) attacked the same
convoy.
0727 (H) GUITARRO made torpedo attack on same convoy, scored two
hits on a large AK and sank it.

- 3 -
ENCLOSURE (A)

— page 267 —
CONFIDENTIAL
U.S.S. GUITARRO, Co-ordinated Search and Attack Report.

21 August

The above attacks by RAY and HADDO came as a complete
surprise. Nothing was planned between any two of the
three boats. This was quite accidental and even more
so when it is realized that three successful attacks
were made without previous planning, to give a result
which was very nearly a perfect wolf pack attack. The
above attacks illustrated very clearly the proper spac-
ing of submarines along a convoy's track in order to
make a successful attack.
The spacing should be far enough apart so that the
convoy will have time enough to partially recover from
the preceding attack - enough to re-form columns and base
course - and yet not enough time for the escorts to re-
gain screening positions. If less than this spacing is
used, the next attacking submarine will be handicapped
by both escorts and merchantmen dashing about. If more
than the desired spacing is used the escorts will have
settled down once again in position
and will be extremely alert. It is judged from the
above attack that the distance the convoy advances in
40 minutes (2/3 convoy speed) is about the correct
spacing. It is pointed out that the above discussion
is made in the light of only one submarine's findings,
and that additional data may be drawn out from a study
of the reports of submarines concerned in the attack.
Since this convoy was MANILA bound and attacking
submarines were held down nearly the entire day, it was
not feasible to trail or to chase and make additional
attacks.

1947 (H) Sent message to RATON to report results and torpedoes
remaining.
2000 (H) Received reply reporting no attack made and that she was
in PALAWAN PASSAGE.
It was later learned that RATON had seen smoke the
morning of the 21st, and had determined it was heading
in a southwesterly direction. Believing a south bound
convoy to be in transit she had worked out from the
coast, to such position that she could surface and give
chase, which she did at 1100 (H).
2325 (H) Assigned new patrol stations across MANILA - BORNEO
route, to northeast of CALAMIAN GROUP.

- 4 -

ENCLOSURE (A)

— page 268 —
CONFIDENTIAL

U.S.S. GUITARRO, Co-ordinated Search and Attack Report.

                                        22 August

2223 (H) Effected rendezvous with RATON and exchanged information.
         Formed East - West scouting line across trade routes with
         point of origin at Latitude 12°-47'N. Long. 120°-08'E.
         Day patrol submerged in fixed positions.

                                        23 August

         Uneventful patrol.

                                        24 August

0135 (H) Sent message to RATON ordering former patrol stations
         off CAPE CALAVITE, except ship positions reversed.

                                        25 August

2150 (H) Effected rendezvous with RATON. Ordered her to maintain
         these patrol stations until dark of 27 August at which
         time she was detached and to proceed in accordance with
         operation order.

                                        26 - 27 August

         Uneventful patrol. At dark 27th RATON left area.

                                        28 August

         Headed for rendezvous with GUNNEL in accordance with
         COMMANDER TASK FORCE SEVENTY-ONE serial

                                        29 August

0343 (H) Effected rendezvous with GUNNEL. Assigned patrol sta-
         tions and proceeded on scouting line toward MINDORO
         coast. Also told GUNNEL that GUITARRO would leave area
         on night of 30 August.
         Submerged patrol en route.
1950 (H) Heard pinging to southwest and proceeded to search at
         high speed. No contact. Resumed scouting line.
2330 (H) On station off MINDORO coast on East - West patrol line.
         GUNNEL to west.

                                        30 August

         Conducted day submerged stationary patrol.

                                        - 5 -

                                        ENCLOSURE (A)

— page 269 —
CONFIDENTIAL
U.S.S. GUITARRO, Co-ordinated Search and Attack Report.

30 August

1930 (H) Proceeded to leave area in accordance with COMMANDER
          TASK FORCE SEVENTY-ONE operation order. Attempted
          to establish radio communication with GUNNEL to advise
          her to that effect but was unable to contact. Heavy
          radio interference.

(U) REMARKS.

          It is recommended that calls be made up for all submarines
for use on the VOYCALL frequency. These are to be of a permanent
nature, changed periodically if desired. This will enable all
boats to contact any other boat, which is often desirable.
Additional calls for any one wolf pack working together may be used
by prearrangement. Permanent frequencies for such transmissions,
subject to periodic change are also recommended.

          The areas along the west coast of LUZON are considered highly
productive at this time, while those out 100 miles or more at sea
are not considered productive. It is recommended that the areas
along the west coast of LUZON be split up even more than at
present thus making the areas smaller but also allowing more sub-
marines to hammer away at convoys going through this fruitful area.

          Indications show that after a wolf pack attack is made close
inshore Japanese shipping is usually moved out from that point
about 25 miles for an indeterminate length of time.

- 6 -
ENCLOSURE (A)

— page 270 —
FE24-71/A16-3                                UNITED STATES NAVY
Serial: 01104                                     12a/gr.
                                                [STAMP: RECEIVED
                                                OCT 10 1944
                                                1181] 29 Sept. 1944.
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to:
USS GUITARRO Conf. Ltr.
A4 Serial 036 dated 8
September, 1944.

From: The Commander Submarines, SEVENTH FLEET.
To : The Commander-in-Chief, UNITED STATES FLEET.
Via : The Commander, SEVENTH FLEET.

Subject: War Patrol of Coordinated Search and Attack Group
         consisting of U.S.S. GUITARRO and U.S.S. RATON.

         1. This Coordinated Search and Attack Group consist-
ing of GUITARRO and RATON patrolled in the SOUTH CHINA SEA off
the West Coast of LUZON under the command of the Commanding
Officer of the GUITARRO.

         2. There were no Coordinated Attacks by this group.
GUITARRO was able to make two daylight submerged attacks on
coast-hugging convoys during this period. Both attacks were
made in the forenoon and GUITARRO was held down by escorts until
dark. RATON sighted both of these
close submerged. Her efforts to make daylight end around runs,
were frustrated by planes in one instance, and by an incorrect
course estimate in the other.

         3. The recommendation of the Group Commander in re-
gard to the assignment of voice calls to submarines operating in
this Force is under consideration.

         4. The Force Commander congratulates the Group
Commander on the able direction of his units which inflicted the
following damage on the enemy:

                                SUNK

                                By GUITARRO

         1 - DD (AMAGIRI Type - EC) - - - - - 1,700 Tons #
         1 - DD (HIBIKI Type - EC) - - - - - 1,700 Tons
         1 - AK (KUWAYAMA Class - EC) - - - - 5,700 Tons
         1 - SMC (MINATO MARU Class - EC) - - - 700 Tons
         1 - AK (AMAKASU MARU #1 Class - EC) - 2,000 Tons

         TOTAL SUNK - - 11,800 Tons

                                -1-

— page 271 —
- The user wants a transcription of the document.

FE24-71/A16-3
Serial: 01104
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to:
USS GUITARRO Conf. Ltr.
A4 Serial 036 dated 8
September, 1944.

Subject: War Patrol of Coordinated Search and Attack Group
consisting of U.S.S. GUITARRO and U.S.S. RATON.

— page 272 —
SUBMARINE SQUADRON EIGHTEEN
Care of Fleet Post Office
San Francisco, California,
17 September 1944

FC5-18/A16/(00)
Serial 0178
C-O-N-F-I-D-E-N-T-I-A-L
FIRST ENDORSEMENT to
CO USS GUITARRO (SS363)
Conf. Ltr. SS363/A4
dated 8 September 1944

From: The Commander Submarine Squadron EIGHTEEN.
To: The Commander-in-Chief, UNITED STATES FLEET.
Via: (1) The Commander Submarines, SEVENTH FLEET.
     (2) The Commander SEVENTH FLEET.
Subject: Coordinated search and attack group comprising
         U.S.S. GUITARRO (SS363), U.S.S. RATON (SS270)
         and U.S.S. GUNNEL (SS253).

1. This coordinated search and attack group, consist-
ing at first of the GUITARRO and RATON under the command of the
commanding officer of the GUITARRO as the senior officer present,
until 27 August in the area west of Luzon and Mindoro. No coord-
inated attacks were made by this group although area coverage
was good. From information passed on by the RATON, the GUITARRO
was able to et in an attack on a three ship convoy of small
coastal tankers, probably sinking one by gun fire after a fruit-
less torpedo attack.

2. During this period a completely unpremeditated
coordinated attack developed on a convoy off Cape Calavite on 21
August. This convoy was successfully attacked by an unidentified
Blue submarine, then the RAY and GUITARRO in succession. As
reports from all submarines operating in this area are not yet
available, a detailed report of this action cannot be made at
this time.

3. After the departure of RATON from the area,
GUNNEL joined GUITARRO for two days. These days were uneventful
and the departure of GUITARRO ended the coordinated operations.

4. The Group Commander's comments regarding perman-
ent voice calls for all submarines likely to operate in proximity
are sound and their adoption is recommended. His remarks on ship-
ping lanes off Luzon are of value in future planning. [HANDWRITTEN: Con Sub Squad
18, 121 Ed]

- 1 -

— page 273 —
SUBMARINE SQUADRON EIGHTEEN

FC5-18/A16/(00)                                  Care of Fleet Post Office
                                                San Francisco, California
Serial 0178                                     17 September 1944

C-O-N-F-I-D-E-N-T-I-A-L

Subject:        Coordinated search and attack group comprising
                U.S.S. GUITARRO (SS363), U.S.S. RATON (SS270)
                and U.S.S. GUNNEL (SS253).

4. Continued:

His recommendation regarding spacing of units along a convoy
route is borne out by the success of the coordinated attack on
21 August. While this appears to be the ideal spacing for the attack
phase, it is of course too close for most effective search oper-
ations.

[SIGNATURE: Eliot H. Bryant]
ELIOT H. BRYANT.

— page 274 —
[HANDWRITTEN: Photostat (C)]

SS363/A4
Serial 036
DECLASSIFIED

U.S.S. GUITARRO
Fleet Post Office
San Francisco, Calif.

8 September 1944.

From: The Commanding Officer.
To : The Commander in Chief, United States Fleet.
Via : Official Channels.

Subject: Narrative report covering, co-ordinated search and
attack.

Enclosure: (A) Subject report.
(B) Track chart (original only).

1. Enclosures (A) and (B), covering the co-ordinated
search and attack unit consisting of GUITARRO and RATON, with
later addition of GUNNEL, in the areas to the west of LUZON and
MINDORO during the period 7 August 1944 to 30 August 1944 are
forwarded herewith.

/s/
E. D'H. HASKINS.

93142 [STAMP: FILMED]

— page 275 —
CONFIDENTIAL

USS GUITARRO, Co-ordinated Search and Attack Report.

(A) PROLOGUE.

          This submarine attack unit was comprised of the USS
          RATON and USS GUITARRO under the command of Commanding
          Officer GUITARRO. Later, after RATON had left area,
          GUNNEL joined up for two days at the expiration of which
          time GUITARRO departed area. The RATON departed FRE-
          MANTLE, W.A. on 17 July 1944, and the GUITARRO on 21
          July 1944. Unit was formed after arrival of GUITARRO
          in area, which was off the west coasts of LUZON and
          MINDORO.

(B) NARRATIVE.

                                                  7 August

          0225 (H) GUITARRO entered area. Attempted to establish commun-
                   ication with RATON unsuccessfully.

                                                  8 August

                   GUITARRO unable to reach previously designated ren-
                   dezvous due to attack on convoy. Had difficulty
                   establishing radio communication with RATON due to
                   jamming, so sent a message blind establishing scouting
                   line off POINT BOTOLAN. This message not received by
                   RATON.

                                                  9 August

          2100 (H) Established satisfactory radio communication by key on
                   2860 kcs. and scouting line off POINT EOLINAO. Attack
                   unit formed. Night plan consisted of East - West patrol
                   line with RATON, who reported radar temporarily out of
                   commission, 5 - 10 miles offshore, ship movements on the
                   line synchronized.
                   Day plan moved both submarines close inshore submerged,
                   RATON north of Lat. 16°-20'N., GUITARRO south of same
                   line.

                                                  10 August

          1029 (H) GUITARRO made torpedo attack on north bound convoy
                   scoring one, possibly two, hits in KATORI class CL and
                   one hit in a medium AK.

                                                  - 1 -

                                                  ENCLOSURE (A)
[HANDWRITTEN: 2]

— page 276 —
CONFIDENTIAL
U.S.S. GUITARRO, Co-ordinated Search and Attack Report.

                                                                10 August

1237 (H) GUITARRO made torpedo attack on searching HIBIKI class
          destroyer, scoring two hits and sinking it.
          RATON unable to make attack later reported she was
          chasing convoy to north.
2150 (H) Sent message to RATON to rendezvous when able at Lat.
          15°N., Long. 118°E. GUITARRO proceeding to rendezvous
          point.
          This submarine attack unit will shift areas to west in
          accordance with COMMANDER TASK FORCE SEVENTY-ONE Oporder

                                                                11 August

          Shifting areas.

                                                                12 August

0600 (H) Effected rendezvous with RATON. Exchanged information
          and established scouting line on East - West line cover-
          ing MANILA - SINGAPORE trade routes. Surface patrol.

                                                                13 August

2030 (H) Effected rendezvous with RATON. Established search line
          while proceeding to east for special mission.
2056 (H) Special mission cancelled. Ordered RATON to resume
          former patrol station.

                                                                14 August

0200 (H) GUITARRO arrived on station. Scouting line re-estab-
          lished.
1946 (H) Ordered new patrol line 180 miles to north to cover
          EMPIRE - SINGAPORE trade routes.
2000 (H) Executed above message and proceeded north on search
          line.

                                                                15 August

1310 (H) GUITARRO arrived at point of origin. New scouting line
          established on patrol line 300°-120° T.

                                  - 2 -
                                                                ENCLOSURE (A)
[HANDWRITTEN: 3]

— page 277 —
CONFIDENTIAL
U.S.S. GUITARRO, Co-ordinated Search and Attack Report.

16 August

Uneventful surface patrol.

17 August

0645 (H) Proceeded to south on scouting line with RATON. This
          unit due to shift areas on 18 August, and it was desired
          to cover MANILA - SINGAPORE routes while shifting.

18 August

0516 (H) Effected rendezvous with RATON. Proceeded to east on
          scouting line shifting to new areas, headed for patrol
          station off CAPE CALAVITE, in accordance with COMMANDER
          TASK FORCE SEVENTY-ONE serial.
2245 (H) Received RASHER contact report (RASHER Serial ).
          From available information it was determined that
          HARDER's wolf pack would not be in their area yet so
          decided to take advantage of an empty area with a convoy
          coming through it. Ordered RATON to patrol submerged
          close inshore GUITARRO to take submerged
          patrol off BOTOLAN POINT. Both close inshore.

19 August

2145 (H) With failure of convoy to appear decided to clear
          HARDER's area and form scouting line as originally
          planned. Ordered RATON to assigned station off CAPE
          CALAVITE.

20 August

On station off CAPE CALAVITE. At night an East - West
patrol line was formed GUITARRO at point of origin 10
miles offshore, RATON 25 miles offshore. Movements along
the synchronized, speed 10 knots. Day stations submerged
close inshore GUITARRO south of Latitude 13°-27'N.
RATON north of same line.

21 August

055 (H)(about) A submarine (believed to be the RAY) attacked a
          north bound convoy.
0619 (H) A submarine (believed to be the PADDO) attacked the same
          convoy.
0727 (H) GUITARRO made torpedo attack on same convoy, scored two
          hits on a large AK and sank it.

- 3 -
ENCLOSURE (A) [HANDWRITTEN: 4]

— page 278 —
CONFIDENTIAL

U.S.S. GUITARRO, Co-ordinated Search and Attack Report.

21 August

The above attacks by RAY and HADDO came as a complete
surprise. Nothing was planned between any two of the
three boats. This was quite coincidental and even more
so when it is realized that three successful attacks
were made without previous planning which was very nearly a perfect wolf
pack attack. The above attacks illustrated very nearly the proper spac-
ing of submarines along a convoy's track in order to
make a successful attack.
The spacing should be far enough apart so that the
convoy will have time to partially recover from
the preceding attack - to re-form columns and base
course - and yet not enough time for the escorts to re-
gain screening positions. If less than this spacing is
used, the next attacking submarine will be handicapped
by both escorts and merchantmen dashing about. If more
than the desired spacing is used nearly all of the
escorts will have settled down once again in position
and will be extremely alert. It is judged from the
above attack that the distance the convoy advances in
40 minutes (2/3 convoy speed) is about the correct
spacing. It is pointed out that the above discussion
is made in the light of only one submarine's findings,
and that additional data may be drawn out from a study
of the reports of submarines concerned in the attack.
Since this convoy was MANILA bound and attacking
submarines were held down nearly the entire day, it was
not feasible to trail or to chase and make additional
attacks.
1947 (H) Sent message to RATON to report results and torpedoes
remaining.
2000 (H) Received reply reporting no attack made and that she was
in PALAVAN PASSAGE.
It was later learned that RATON had seen smoke the
morning of the 21st, and had determined it was heading
in a southwesterly direction. Believing a south bound
convoy to be in transit she had worked out from the
coast, to such position that she could surface and give
chase, which she did at 1100 (H).
2325 (H) Assigned new patrol stations across MANILA - BORNEO
route, to northeast of CIAN GROUP.

- 4 -
ENCLOSURE (A)
[HANDWRITTEN: 5]

— page 279 —
CONFIDENTIAL
U.S.S. GUITARRO, Co-ordinated Search and Attack Report.

22 August

2223 (H) Effected rendezvous with RATON and exchanged information.
     Formed East - West scouting line across trade routes with
     point of origin at Latitude 12°-47'N. Long. 120°-08'E.
     Day patrol submerged in fixed positions.

23 August

     Uneventful patrol.

24 August

0135 (H) Sent message to RATON ordering former patrol stations
     off CAPE CALAVITE, ship positions reversed.

25 August

2150 (H) Effected rendezvous with RATON. Ordered her to maintain
     these patrol stations until dark of 27 August at which
     time she was detached and to proceed in accordance with
     operation order.

26 - 27 August

     Uneventful patrol. At dark 27th RATON left area.

28 August

     Headed for rendezvous with GUNNEL in accordance with
     COMMANDER TASK FORCE SEVENTY-ONE serial.

29 August

0343 (H) Effected rendezvous with GUNNEL. Assigned patrol sta-
     tions and proceeded on scouting line toward MINDORO
     coast. Also told GUNNEL that GUITARRO would leave area
     on night of 30 August.
     Submerged patrol en route MINDORO coast.
1950 (H) Heard pinging to southwest and proceeded to search at
     high speed. No contact. Resumed scouting line.
2330 (H) On station off MINDORO coast on East - West patrol line.
     GUNNEL to west.

30 August

     Conducted day submerged stationary patrol.

- 5 -

ENCLOSURE (A)
[HANDWRITTEN: 6]

— page 280 —
CONFIDENTIAL
U.S.S. GUITARRO. Co-ordinated Search and Attack Report.

30 August

1930 (H) Proceeded to leave area in accordance with COMMANDER
          TASK FORCE SEVENTY-ONE operation order. Attempted
          to establish radio communication with GUNNEL to advise
          her to that effect but was unable to contact. Heavy
          radio interference.

(U) REMARKS.

     It is recommended that calls be made up for all submarines
for use on the VOYCALL frequency. These are to be of a permanent
nature, changed periodically if desired. This will enable all
boats to contact any other boat, which is often desirable.
Additional calls for any one wolf pack working together may be used
by prearrangement. Permanent frequencies for such transmissions,
subject to periodic change are also recommended.

     The areas along the west coast of LUZON are considered highly
productive at this time, while those out 100 miles or more at sea
are not considered productive. It is recommended that the areas
along the west coast of LUZON be split up even more than at
present thus making the areas smaller but also allowing more sub-
marines to hammer away at convoys passing through this fruitful area.

     Indications show that after a wolf pack attack is made close
inshore Japanese shipping is usually moved out from that point
about 25 miles for an indeterminate length of time.

- 6 -                                            ENCLOSURE (A)           7

— page 281 —
SUBMARINE SQUADRON EIGHTEEN

FC5-18/A16/(00)
Serial 0178

C-O-N-F-I-D-E-N-T-I-A-L

FIRST ENDORSEMENT to
CO USS GUITARRO (SS363)
Conf. Ltr. SS363/A4
dated 8 September 1944

From: The Commander Submarine Squadron EIGHTEEN.
To: The Commander-in-Chief, UNITED STATES FLEET.
Via: (1) The Commander Submarines, SEVENTH FLEET.
(2) The Commander SEVENTH FLEET.

Subject: Coordinated search and attack group comprising
U.S.S. GUITARRO (SS363), U.S.S. RATON (SS270)
and U.S.S. GUNNEL (SS253).

1. This coordinated search and attack group, consist-
ing at first of the GUITARRO and RATON under the command of the
commanding officer of the former vessel, operated from 8 August
until 27 August in the area west of Luzon and Mindoro. No coord-
inated attacks were made by this group although area coverage
was good. From information passed on by the RATON, the GUITARRO
was able to get in an attack on a three ship convoy of small
coastal tankers, probably sinking one by gun fire after a fruit-
less torpedo attack.

2. During this period a completely unpremeditated
coordinated attack developed on a convoy off Cape Calavite on 21
August. This convoy was successfully attacked by an unidentified
Blue submarine, then the RAY and GUITARRO in succession. As
reports from all submarines operating in this area are not yet
available, a detailed report of this action cannot be made at
this time.

3. After the departure of RATON from the area,
GUNNEL joined GUITARRO for two days. These days were uneventful
and the departure of GUITARRO ended the coordinated operations.

4. The Group Commander's comments regarding perman-
ent voice calls for all submarines likely to operate in proximity
are sound and their adoption is recommended. His remarks on ship-
ping lanes off Luzon are of value in future planning.

- 1 -

[HANDWRITTEN: 8]

— page 282 —
SUBMARINE SQUADRON EIGHTEEN

FC5-18/A16/(00)                                Care of Fleet Post Office
                                              San Francisco, California
Serial 0178                                   17 September 1944

C-O-N-F-I-D-E-N-T-I-A-L

Subject:      Coordinated search and attack group comprising
              U.S.S. GUITARRO (SS363), U.S.S. RATON (SS270)
              and U.S.S. GUNNEL (SS253).

4. Continued:

His recommendation regarding spacing of units along a convoy
route is borne out by the success of the coordinated attack on
21 August. While this appears to be ideal spacing for the attack
phase, it is of course too close for most effective search oper-
ations.

[SIGNATURE: Eliot H. Bryant]
ELIOT H. BRYANT.

[HANDWRITTEN: 9]

— page 283 —
[HANDWRITTEN: F4253.]
UNITED STATES NAVY 12a/gr.
[HANDWRITTEN: R-uss] 29 Sept. 1944.
[HANDWRITTEN: 11-20-44] 10 01507

FE24-71/A16-3
Serial: 01104
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to:
USS GUITARRO Conf. Ltr.
A4 Serial 036 dated 8
September, 1944.

From: The Commander Submarines, SEVENTH FLEET.
To : The Commander-in-Chief, UNITED STATES FLEET.
Via : The Commander, SEVENTH FLEET.

Subject: War Patrol of Coordinated Search and Attack Group
consisting of U.S.S. GUITARRO and U.S.S. RATON.

1. This Coordinated Search and Attack Group consist-
ing of GUITARRO and RATON patrolled in the SOUTH CHINA SEA off
the West Coast of LUZON under the command of the Commanding
Officer of the GUITARRO.

2. There were no Coordinated Attacks by this group.
GUITARRO was able to make two daylight submerged attacks on
coast-hugging convoys during this period. Both attacks were
made in the forenoon and GUITARRO was held down by escorts until
dark. RATON sighted both of these convoys, but was unable to
close submerged. Her efforts to make daylight end around runs,
were frustrated by planes in one instance, and by an incorrect
course estimate in the other.

3. The recommendation of the Group Commander in re-
gard to the assignment of voice calls to submarines operating in
this Force is under consideration.

4. The Force Commander congratulates the Group
Commander on the able direction of his units which inflicted the
following damage on the enemy:

SUNK
By GUITARRO
1 - DD (AMAGIRI Type - EC) - - - - 1,700 Tons #
1 - DD (HIBIKI Type - EC) - - - - 1,700 Tons
1 - AK (KUWAYAMA Class - EC) - - - 5,700 Tons
1 - SMC (MINATO MARU Class - EC) - - 700 Tons
1 - AK (AMAKASU MARU #1 Class - EC) - 2,000 Tons

TOTAL SUNK - - 11,800 Tons

[STAMP: FILMED]
- 1 -
[STAMP: EXTRA ORIGINAL]
[STAMP: SC. MICRO]
[STAMP: PHOTO-LAB OP-16]
[STAMP: RETURN TO F-4253]
[HANDWRITTEN: 10]

— page 284 —
FE34-71/A16-3 UNITED STATES NAVY 12a/gr.
Serial: 01104 29 Sept. 1944.
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to:
USS GUITARRO Conf. Ltr.
A4 Serial 036 dated 8
September, 1944.

Subject: War Patrol of Coordinated Search and Attack Group
consisting of U.S.S. GUITARRO and U.S.S. RATON.

— page 285 —
[UNCLEAR: I-C-44)]
[STAMP: DECLASSIFIED]

U.S.S. BREAM (SS243)
% Fleet Post Office,
San Francisco, Calif.

18 November 1944

From: Commanding Officer.
To: Commander-in-Chief, UNITED STATES FLEET.
Via: Commander Submarines SQUADRON EIGHTEEN.
     Commander Submarines SEVENTH FLEET.
     Commander SEVENTH FLEET.

Subject: War Patrol of Coordinated Search and Attack
         Group consisting of USS RATON, USS GUITARRO,
         USS BREAM - Report of.

Enclosure: (A) Subject War Patrol Report.

1. Enclosure (A) covering the subject patrol
report is enclosed herewith.

2. Details of the activities of the USS RATON,
GUITARRO, and BREAM are covered in the patrol reports submitted
by those vessels.

W.G. CHAPPLE

— page 287 —
[UNCLEAR: 2126-4]
U.S.S. BREAM (SS243)

Report of WAR PATROL OF COORDINATED SEARCH AND ATTACK
GROUP RATON, GUITARRO, BREAM

— page 289 —
SS23/16-4
Serial (020-44)
CONFIDENTIAL

U.S.S. BREAM (SS243)

Report of WAR PATROL OF COORDINATED SEARCH AND ATTACK
GROUP, RATON, GUITARRO, BREAM. -----

"C" COMMUNICATIONS

The SJ Radar keying was found to be most satisfactory
for communicating up to twenty miles and on one occas-
ion was good at 45 miles. The voice communication on
2656 was used as an alternate frequency for other
radio communications which were sent by Aircraft Code
on C.W. The use of the C.W. was kept to a minimum
and only used when no SJ interference from the sub-
marines was had. C.W. communication was satisfactory.
Only three messages were sent by radio during the group
operations. The Aircraft Contact Code is thought to
be very satisfactory for communications within a coord-
inated attack group.

"D" REMARKS

In the conferences of Commanding Officers the Group
Commander perhaps laid too much stress on keeping
radio communication to a minimum as the BREAM did not
get word from the GUITARRO that the convoy of the 30th
was holed up in DASOL BAY. The BREAM could have made
another attack on the convoy the 31st had she received
the word of its position.

The spacing of submarines along the coast worked very
well especially on the occasion of the 3 attacks on
the Cruisers. While only one attack per boat is usually
the rule when working close to the coast it should, if
continued, drive the convoys out to sea again.

The RAY unofficially joined our group on 6 November and
there seems to be some question as to exactly what
occurred. The RATON reported one was being beached and
the RAY reported one was being towed South. The patrol
reports of these vessels will not be available for some
time and no further comment is made.

There is little doubt in the Group Leader's mind that
the use of a coordinated group reduces the Jap counter
measures.

- 4 -

— page 290 —
S-13/A16-3
Serial 0247

CONFIDENTIAL

FIRST ENDORSEMENT to
CO USS BREAM Conf. ltr.
A16-4 Serial (020-44)
dated 18 November 1944.

From: The Commander Submarine
To: The Commander in Chief, UNITED STATES FLEET.
Via: (1) The Commander Submarines, SEVENTH FLEET.
     (2) The Commander SEVENTH FLEET.
Subject: War Patrol of Coordinated Search and Attack Group
         consisting of U.S.S. RATON (SS270), U.S.S. GUITARRO
         (SS363) and U.S.S. BREAM (SS243) - Report of.

1. This attack group under command of Commander W.G. Chapple,
U.S.N., operated on the Luzon coast between Manila Bay and Cape Bolinao.
BREAM and GUITARRO rendezvoused on 25 October 1944, RATON joining on 3
November.

2. As traffic in the area hugged the coast the submarines
were disposed in lanes running west from the coast line. Experience had
shown this to be the best disposition of forces in this particular area
for intercepting enemy convoys and task forces. Thus two enemy convoys
were hit in succession by each submarine as it moved along the coast.
This occurred on 30 and 31 October in attacks on the same southbound
convoy by BREAM and GUITARRO on respective days during daylight, result-
ing in considerable damage to the enemy. Again on 4 November a large AP
accompanied by landing craft and escorts was attacked during daylight by
RATON, BREAM and GUITARRO in succession within an hour and a quarter.
The AP was finally sunk by GUITARRO. On 6 November a northbound convoy
including two CA's and about seven AK's was attacked by the group in
succession during daylight. Each submarine chose a CA as a target with
the following results: GUITARRO 3 hits; RATON 3 hits; and BREAM 2 hits.
RAY, to the northward of the group getting 2 hits. Thus twenty torpedoes
were fired at the convoy in less than two hours, resulting in ten hits.
This attack exhausted the supply of torpedoes and the group disbanded.

3. The remarks of the group commander regarding disposition
of submarines in this area and use of SJ as primary means of pack comm-
unications are concurred in. Convoy exercises in the training areas and
on the game board have again proven their value.

4. The Squadron Commander heartily congratulates the group
commander and the three submarines on the important damage inflicted and
on the fine teamwork, courage and aggressiveness displayed by each unit.

SUBMARINE SQUADRON EIGHTEEN
Wx
Care of Fleet Post Office
San Francisco, California.
25 November 1944

[SIGNATURE: Harry A. Guthrie]
HARRY A. GUTHRIE.

— page 291 —
FB24-7/A16-3 UNITED STATES NAVY 14e/pr
Serial 079 14 January 1945
[STAMP: RECEIVED S-C FILES]
C-O-N-F-I-D-E-N-T-I-A-L [HANDWRITTEN: 2 3 C Room 2055]
[STAMP: ROUTE TO 31 JAN 1945]
SECOND ENDORSEMENT to: [HANDWRITTEN: Up File No. (w) 152951]
USS BREAM Comdr. Ltr. A16-3 [HANDWRITTEN: Log. No. 2 of 2]
Serial 080-44, dated 17 [HANDWRITTEN: Copy No.]
November, 1944. [HANDWRITTEN: Re. No.]

From: The Commander Submarines, SEVENTH FLEET.
To: The Commander in Chief, UNITED STATES FLEET.
Via: The Commander, SEVENTH FLEET.

Subject: Report of Coordinated Search and Attack Group
Consisting of U.S.S. BREAM, U.S.S. GUITARRO and
U.S.S. RATON - Comment on.

1. The Coordinated Search and Attack Group consisting
of BREAM, GUITARRO and RATON patrolled off the west coast of LUZON
and CAPE BOLINAC, under the direction of Commander W. G. CHAPPLE,
U.S.N., Commanding Officer of BREAM.

2. The first coordinated attack commenced when BREAM
attacked a convoy south of DASOL BAY, on the 3rd of October, and
damaged one large AP. GUITARRO attacked the same convoy next
morning, and sank three large AKs. GUITARRO observed the AP
previously damaged by BREAM to be down by the bow, but still
proceeding in company.

3. The second coordinated attack took place on the
4th of November. At 1525 RATON made the first attack on a convoy
consisting of one large AP accompanied by landing craft and several
escorts; no hits were made. At 1630 BREAM made one hit on the
large AP, and twelve minutes later GUITARRO finished it off with
one additional hit.

4. The third coordinated attack occurred on the sixth
of November, when a large convoy led by two heavy cruisers, was
attacked in succession by the entire group plus RAY. At 0806
GUITARRO made three hits in the leading CA. At 0843 BREAM hit one
of the CA's in the formation with two torpedoes. At 0945 RATON
fired at one of the same cruisers. RAY was closing to attack at
this time and saw RATON's torpedoes miss the cruiser and pass
fairly close to her own conning tower. A few minutes later RAY
attacked this cruiser and made two hits, which blew the bow off.
RAY was unable to make any further attacks on this crippled ship
due to shallow water and heavy escort activity, but saw it being
taken in tow. This heavy cruiser was ultimately destroyed by
aircraft off SANTA CRUZ. Commander Submarines, PACIFIC FLEET,
[STAMP: Office of the Chief of Naval Operations FLEET MAINTENANCE]
[STAMP: 1 FEB 1945]
[STAMP: RECEIVED]
[STAMP: NAVY DEPARTMENT]

104 - 1 -

— page 292 —
FE24-71/A16-3 UNITED STATES NAVY 14a/pr
Serial 079 14 January 1945.

C-O-N-F-I-D-E-N-T-I-A-L

SECOND INDORSEMENT to:
USS BREAM Comd's ltr. A16-3
Serial 020-44, dated 17
November, 1944.

Subject: Report of Coordinated Search and Attack Group
Consisting of U.S.S. BREAM, U.S.S. GUITARRO and
U.S.S. RATON.

4.
divided the credit for sinking this ship between RAY and the Air
Forces involved. Credit for damaging the other cruiser in this
convoy is divided between GUITARRO and BREAM.

5.
During the period this group was patrolling off
LUZON, convoys were hiding out at night in protected anchorages
and proceeding up and down the coast during daylight. The Group
Commander's disposition of submarines in a line along the coast
was very effective in this situation. Two convoys moving along
the coast were attacked by all three submarines in succession.

6.
The Force Commander congratulates the Group
Commander, and GUITARRO, RATON and BREAM for inflicting the
following damage on the enemy while operating as a Coordinated
Group:

SUNK
1 - AK (Similar TAMON MARU) 8,200 Tons (WILLIS, Attack No. 1)
1 - AK (Large - EU) 7,500 Tons (GUITARRO, Attack No. 1)
1 - AK (Large - EU) 7,500 Tons (GUITARRO, Attack No. 1)
1 - AP (Large - EU)* 10,000 Tons (BREAM, Attack No. 3)
(GUITARRO, Attack No. 2)
Total 33,200 Tons

DAMAGED
1 - AP (Large - EU) 10,000 Tons (BREAM, Attack No. 2)
1 - CA (ATACO Class - EU)* 12,500 Tons (GUITARRO, Attack No. 3)
(BREAM, Attack No. 4)
Total 22,500 Tons

Grand Total 55,700 Tons

* - Divided between BREAM and GUITARRO.

- 2 - JAMES FIFE.

— page 293 —
FE24-71/A16-3 UNITED STATES NAVY
Serial 079 14a/pr
14 January 1945.

C O N F I D E N T I A L

SECOND ENDORSEMENT to:
USS BREAM Conf. Ltr. A16-3
Serial 020-44, dated 17
November, 1944.

Subject: Report of Coordinated Search and Attack Group
Consisting of U.S.S. BREAM, U.S.S. GUITARRO and
U.S.S. RATON - Comment on.

— page 294 —
SS363/A16-3/S86
Serial 0001
[STAMP: DECLASSIFIED]
[STAMP: 1-20-04]

U.S.S. GUITARRO (SS363)
CLASSIFICATION REDUCED TO
UNCLASSIFIED
BY AUTHORITY OF
OPNAV INST. 5510.1
DATED 18 JUN 53
By [HANDWRITTEN: R.O.Bric] Date [HANDWRITTEN: 22 Oct 58]

[HANDWRITTEN: 1 copy less
[HANDWRITTEN: obtained
[HANDWRITTEN: by esPar]
Care of Fleet Post Office,
San Francisco, California.
20 April 1945.

From: The Commanding Officer.
To : The Commander Task Group SEVENTY ONE Point FOUR.

Subject: Mine Laying - Report of.

Reference: (a) C.T.F. 71 OpOrd No. 47-45 of 8 April 1945.
(b) Annex (D) to above OpOrd.

Enclosure: (A) Four copies of overlay of mine plant.

1. In accordance with instructions given in references (a) and
(b), this vessel laid a field of twenty-three (23) Mark 12, Mod 0 mines off
Tg. Djaboeng, Sumatra in the vicinity of Latitude 1° 00'S and Longitude 104°
30'E on 20 April 1945. Enclosure (A) gives exact location of each mine in
the plant. No appreciable tides and currents were noted.

2. The firing mechanism was Mk. 3, mod. 2 Red (North) setting
with average sensitivity of 10 mgs. No sterilizers, no delay arming device and
no ship contact device was installed.

3. There were no prematures or countermines noted. The average
depth of water was seven fathoms.

4. The depth of discharge was three feet. The speed of laying
was 5 knots with 500 yards distance between mines.

5. The sea was calm, the moon had just set and the sky was clear
and bright with a few scattered clouds.

6. No difficulties were encountered in handling mines.

7. NARRATIVE:

The mining of Berhala Strait was an operation which required three days,
involving the approach, the mining, and finally the departure. A successful
mine plant depended primarily upon our ability to remain undetected during
these three days. A considerable distance, approximately 140 miles, was of
insufficient depth for diving purposes and was, for the most part, of less
than 10 fathoms. This area must, of necessity, be covered during darkness by
high speed surface running. Unfortunately nature had provided a clear cloud-
less night with a moon well in its second quarter. We had previously decided
that the SD and SJ radar would not be used in order that our presence would
not be made known by detection. There was, therefore, a good possibility that
a surprise contact with small boats, merchantmen, patrol vessels and aircraft
might divulge our presence, as we had to rely solely on the ability of our
surface lookouts who, as the facts bear out, did their job exceedingly well.

[HANDWRITTEN: (Conduits and cable box #T5379 RS #4463A FILE S76]
[HANDWRITTEN: S/N]

- 1 -

— page 297 —
[HANDWRITTEN: 41]

[HANDWRITTEN: XXXX SECRET]
[HANDWRITTEN: GUITARRO]
[HANDWRITTEN: FIFTH WAR PATROL]
[HANDWRITTEN: ORIGINAL MISSION]

[HANDWRITTEN: 104°30'E]

[HANDWRITTEN: 00°56'30"S (a)]
[HANDWRITTEN: 104°31'20"E]

[HANDWRITTEN: 00°57'45"S]
[HANDWRITTEN: 104°32'57"E]
[HANDWRITTEN: (b)]

[HANDWRITTEN: 1°00'S]

[HANDWRITTEN: 1°00'S]

[HANDWRITTEN: (d)]
[HANDWRITTEN: 01°02'30"S]
[HANDWRITTEN: 104°27'00"E]

[HANDWRITTEN: ⊙ CONTEMPLATED]
[HANDWRITTEN: • ACTUAL]
[HANDWRITTEN: SCALE 1" = 1000 YDS.]

[HANDWRITTEN: (c) 01°03'45"S]
[HANDWRITTEN: 104°28'37"E]
[HANDWRITTEN: 104°30'E]

— page 298 —
[HANDWRITTEN: A16-3/88]

UNITED STATES FLEET
COMMANDER SEVENTH FLEET

S81-1(P-5-2B/whr)
Serial 002127

[HANDWRITTEN: 09910]
[STAMP: RECEIVED AUG 7 3 53 PM 1945 COMMANDER IN CHIEF]
[HANDWRITTEN: 22269]

FIRST ENDORSEMENT on:
CTF 71, Top Sec. ltr.,
serial 0004-A, dated
20 July 1945.

From: Commander Seventh Fleet.
To: Chief of Naval Operations.

Subject: Report of Minelaying Operation During Sixth
War Patrol of U.S.S. GUITARRO (SS363).

1. Forwarded.

2. Copies of the basic enclosure are forwarded to
other commands as indicated.

3. The classification of basic correspondence is
hereby down-graded to secret..

J. H. LONG
By direction

Copy to:
CominCh
CinCAffPac
CinCPac (Guam)
CinCPac (Pearl)
SACSEA
ComSubs7thFlt (End. only)
CO, USS GUITARRO (End. only)

— page 299 —
END OF REEL
JOB NO. [HANDWRITTEN: AR-88-81]
[HANDWRITTEN: E-108]

|||| 1.0
|||| 1.1
|||| 1.25 |||| 1.4 |||| 1.6

|||| 2.8
|||| 2.5
|||| 3.2
|||| 2.2
|||| 3.6
|||| 2.0
|||| 4.0
|||| 1.8
|||| 4.5
|||| 1.6
|||| 5.0

THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

[SEAL: DEPARTMENT OF DEFENSE UNITED STATES OF AMERICA]

MICROFILMED BY
NPPSO-NAVAL DISTRICT WASHINGTON
MICROFILM SECTION