U.S.S. GRAYLING (SS-209) — war patrol report SS-209_GRAYLING.pdf

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START OF REEL
JOB NO. [HANDWRITTEN: H-108]
[HANDWRITTEN: AR-180-76]

1.0
1.1
1.25

2.8
3.2
3.5
3.8
4.0

2.5
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2.0
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OPERATOR [HANDWRITTEN: C. MILLER]
DATE [HANDWRITTEN: 1/2/76]

THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

[IMAGE: Department of Defense Seal]
DEPARTMENT OF DEFENSE
UNITED STATES OF AMERICA

MICROFILMED BY
NPPSO-NAVAL DISTRICT WASHINGTON
MICROFILM SECTION

REEL TARGET, START & END
NAVEXOS 3968

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UNITED STATES
SUBMARINE LOSSES
WORLD WAR II

Released with an Appendix of
Axis Submarine Losses, fully indexed,
by

Naval History Division
Office of the Chief of Naval Operations
Washington: 1963

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GRAYLING (SS 209)

GRAYLING (Cdr. R. M. Brinker) departed Fre-
mantle on 30 July 1943, for her eighth patrol, going
through Makassar Strait and thence to the Philippine
area. On 19 August she reported having damaged a
6,000 ton freighter near Balikpapan, and the following
day told of having sunk a 250 ton Taki Maru-type pocket
tanker by gunfire in Sibutu Passage, taking one man
prisoner. This was the last report received direct from
GRAYLING. On 23 August, she completed a special
mission at Pandan Bay, Panay, delivering cargo to
guerrillas. This mission was reported by guerrillas.
Then she departed for Tablas Strait, there to recon-
noiter until 2 September, when she would patrol ap-
proaches to Manila until 10 September. She was to
return to Pearl Harbor for refit, passing from SubSo-
WesPac to Subpac on 13 September.

She was not heard from after 19 August 1943, and
on 30 September 1943, GRAYLING was reported as
presumed lost.

Following war's end, the Japanese have submitted
the following reports which bear on GRAYLING. On 27
August 1943 a torpedo attack was seen by the enemy at
12°-50'N, 121°-33'E, and the next day a surfaced subma-
rine was seen at 12°-50'N, 121°-42'E. Both of these
positions are in the Tablas Strait area. On 9 September
a surfaced U. S. submarine was seen inside Lingayen
Gulf; this ties with GRAYLING's orders to patrol the
approaches to Manila. It is said that the freighter-
transport HOKUAN MARU was engaged in a submarine
action on the 9th in the Philippine area, but no additional
data were available, and no known enemy attacks could
have sunk GRAYLING. Her loss may have been opera-
tional or by an unrecorded enemy attack. At any rate,
it is certain that GRAYLING was lost between 9 and 12
September 1943 either in Lingayen Gulf or along the
approaches to Manila. ComTaskFor 71 requested a
transmission from GRAYLING on the latter date, but
did not receive one.

GRAYLING's first patrol, made in January and Feb-
ruary 1942, was a reconnaissance of the northern
Gilbert Islands. She went to the Japanese homeland
for her second patrol, and sank a freighter and dam-
aged a sampan. Truk was the scene of GRAYLING's
third patrol; she sank a large freighter. On her fourth
patrol, this boat again went to Truk, and sank a medium

tanker, while she damaged an aircraft transport. In
January and February 1943, she patrolled the approaches
to Manila on her fifth patrol! Here she sank two freight-
ers and a medium freighter-transport. GRAYLING
patrolled the Lesser Islands south of the Philippines on
her sixth patrol, and sank two freighters, a small
freighter-transport and two schooners. Damage was
done to a large tanker and two freighters. She went to the
area west of Borneo for her seventh patrol, and sank a
medium freighter and two sampans. Damage was done
to a large tanker. Thus GRAYLING's total record is
16 ships sunk, totalling 61,400 tons, and six ships dam-
aged, for a total of 36,600 tons.

R. M. Brinker

52

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USS Grayback (SS-208)

back's first patrol terminated at Yokosuka, Japan, as did
two others. She returned to Pearl Harbor 8 December
1966. On 22 February 1967, Grayback modified her missile
launching system and simplified her complex electrical
circuits. After this, she again took up deterrent missile
strike missions. Over the next 2½ years she completed
seven missions for a total of nearly 18 months at sea.
She submerged 130,000 miles on deterrent missile
strike missions.
As more and more Polaris submarines became opera-
tional, they assumed the deterrent functions previously
assigned to Grayback and her sister ships. She decom-
missioned at Mare Island 25 May 1964. At present she
is being converted to a submarine troop transport and
will serve the Navy as Grayback (APSS-574). Conver-
sion is scheduled to be completed in December 1968.

Graylag

A common gray goose.

(AM-364: dp. 720; l. 184'6"; b. 33'; dr. 9'9"; s. 15 k.;
a. 1 3"; cl. Admirable)

Graylag (AM-364), a steel-hulled fleet minesweeper,
was launched by Willamette Iron & Steel Corp., Astoria,
Oreg., 4 December 1943; and commissioned 31 August
1944, Lt. S. M. Janney in command.
After steaming to San Diego 11 October, Graylag got
underway 1 November for Pearl Harbor, where she
arrived eight days later. The ship picked up passengers
and returned to San Diego 20 November. Graylag then
steamed by way of the Panama Canal to New Orleans
7 to 26 December 1945, and arrived 27 March 1946 at
Orange, Tex., after overhaul. She decommissioned 12
August 1946, was placed in reserve, and remains there.

140
through 1967. Graylag's designation was changed to
MSF-364 on 7 February 1955.

Grayling

A fresh water game fish closely related to the trout.

I

The first Grayling (SS-18) was renamed D-2 (q.v.) 17
November 1911 while on duty with the Atlantic Torpedo
Fleet.

II

(SP-1259: l. 41'5'6"; b. 7'; dr. 2'10"; s. 14 k.; a. 1 mg.)

The second Grayling (SP-1259) was built by Boyden
of Amesbury, Mass., in 1915 and acquired by the Navy
from her owner, E. E. Gray, 7 May 1917. She commis-
sioned 22 May 1917 and was used by the 1st Naval District
as a patrol craft in Boston harbor until returned to her
owner 30 November 1918.

III

(SP-289: l. 50'5"; b. 10'3"; dr. 3'; s. 10 k.; a. 1 1-pdr.)

The third Grayling (SP-289) was built by Peterson,
Hudson River, N.Y., in May 1917; and acquired by the
Navy from her owner, Myer Resnick, 22 May 1917;
and commissioned the same day, Boatswain Robert L. Kemp, USNRF, in command.
She served as a patrol boat on local and coastal waters
around Norfolk, Va., during the remainder of World War
I. She decommissioned 15 January 1919 and was re-
turned to her owner the same day.

IV

(SS-209: dp. 1,475 t. (surf.), 2,370 t. (subm.); l. 307'2";
b. 27'3"; dr. 13'3"; s. 20 k. (surf.), 10 k. (subm.);
a. 1 3"; 10 21" tt.; cl. Tambor)

— page 6 —
USS Grayling (SS-18) was renamed D-2 on 17 November 1911.

The fourth Grayling (SS-209) was laid down at the
Navy Yard, Portsmouth, N.H., 15 December 1939;
launched 4 September 1940; sponsored by Mrs. Herbert
F. Leary; and commissioned 1 March 1941, Lt. Comdr. E.
Olson in command.

After conducting tests and sea trials, she was called
upon 20 June 1941 to assist in the search for submarine
O-9, which had failed to surface after a practice dive off
Isle of Shoals. O-9 was subsequently discovered on the
bottom, but rescue efforts failed; Grayling participated 22
June in the memorial services for those lost.

Joining the Atlantic Fleet, Grayling sailed on shake-
down cruise 4 August to Morehead City, N.C., and St.
Thomas, Virgin Islands, returning to Portsmouth 29 Au-
gust. After final acceptance, she departed 17 November,
transited the Panama Canal 3 December, and moored at
Pearl Harbor 10 December. Grayling was chosen for the
Pacific Fleet change of command ceremony 31 December
1941. On that day Admiral C. W. Nimitz hoisted his flag
abroad Grayling as Commander Pacific Fleet and began
the Navy's long fighting road back in the Pacific.

After the ceremonies, Grayling stood out of Pearl Har-
bor on her first war patrol 5 January 1942 around
Northern Guam Islands. Grayling failed to register a
kill, but gained much in training and readiness, returning
to Pearl Harbor 7 March.

Her second patrol, beginning 27 March, was more suc-
cessful. Cruising off the coast of Japan itself, Grayling
sank her first ship 13 April, sending the cargo freighter
Ryujin Maru to the bottom. She returned to Hawaii 16
May.

Grayling returned to action in June as all available
ships were pressed into service to oppose the Japanese
advance on Midway. As part of Task Group 7.1, Grayling
and her sister submarines were arranged in a fan-like re-
connaissance deployment west of Midway, helping to pro-
vide knowledge of Japanese movements.

As Naval planners established a submarine blockade of
Truk in connection with the offensive in the Solomons,
Grayling was ordered to Truk. She sailed 24 July 1942 around
the Japanese stronghold. She damaged a Japanese sub-
marine 12 August, but was forced to return to
Pearl Harbor 20 August for repairs.

At Pearl Harbor, Grayling was fitted with
new radar and was readied for her fourth patrol 19
September. She sank one cargo ship and six separate
schooners. Grayling successfully engaged a convoy of
small craft, sinking a Moton cargo ship and an
unidentified schooner. She returned to Fremantle, Australia, 13
December.

111

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The Grayling's fifth war patrol was
from Fremantle. She operated
in the Philippine waters. On
7 January 1943 on her fifth patrol,
Grayling sank cargo ship Ushio
Maru 26 January and damaged another
the next day. After sinking a
schooner 24 February, Grayling
returned to Fremantle.

Grayling began her sixth war patrol in
Philippine waters 18 March. On her sixth
war patrol and cruising in the Tarakan area and the Verde
Island Passage, Grayling attacked and sunk cargo ship
Shanghai Maru 6 April and damaged four other ships
before returning 25 April.

Her seventh war patrol, commencing 18 May, took
Grayling off northwest Borneo, where she sank a cargo
ship and two small ships before returning 15 June.

Grayling began her eighth and last war patrol in July
from Fremantle. She made two visits to the coast of
the Philippines delivering supplies and equipment to guer-
rillas at Paluan and Puerto Point, Mindoro. On 27
August 1943, cruising in the Philippines area, Grayling
recorded her last kill: the passenger-cargo Meizan Maru.
Grayling was officially reported "lost" after 9 September
1943, after having recorded five major kills totaling
20,575 tons. All but the first of Grayling's eight war
patrols were declared "successful." Grayling received six
battle stars for World War II service.

The name Grayling was assigned to SS-492 on 20 August
1944, but was cancelled 12 August 1945 prior to con-
struction.

(SS(N)-646; dp. 4,140; l. 292'3"; b. 31'8"; s. 16 k.; cpl.
107; a. 4 tt.; cl. Sturgeon)

The fifth Grayling was laid down at the Portsmouth
Naval Shipyard, Portsmouth, N.H., 12 May 1964; launched
22 June 1967; sponsored by Miss Lori Brinker, daughter
of Lt. Comdr. Robert Brinker, who commanded Grayling
(SS-209) when she was lost in action; and is to com-
mission in the spring of 1969. Once commissioned, she
will become a key element in the under-water deterrent
force of the Navy and will contribute to the vital, con-
tinuing task of "keeping the peace" over the vast reaches
of global waters. Designed to attack and destroy all
types of enemy ships, at great depths and high sub-
merged speeds, making her a potent and effective challenge
to enemy submarines. Operating under nuclear power, she
can conduct long-range reconnaissance patrols and surveillance
missions without risking detection by surface ships. Moreover,
she is designed to carry out extensive ASW operations,
either alone or with other fleet submarines and destroyer-
type surface ships.

Grayson

Cary Travers Grayson was born in Culpeper, Va., 11
October 1878. After completing his medical studies, he
was appointed Acting Assistant Surgeon, USN, 14 July
1903. A variety of posts led Grayson to Washington,
where on 12 December 1912 he was assigned to the Bureau
of Medicine and Surgery with additional duty as Aide to
the White House. Commissioned Rear Admiral 20 Au-
gust 1916, he served as personal physician and aide to
President Woodrow Wilson during World War I. Before
being transferred to the Retired List 20 December 1928,
Admiral Grayson received the Navy Cross for exceptionally
meritorious service as personal physician to President
Wilson. He was also made Commander of the National
Order of the Legion of Honor by the French government.
Admiral Grayson served as chairman of the American
Red Cross from 1935 until his death 15 February 1938.

Assigned the name Grayson on 19 May 1938, DD-429 was
renamed Livermore (DD-429) on 23 December 1938 prior
to being laid down.

142

I

(DD 435; dp. 1,630; l. 348'3"; b. 36'1"; dr. 12'9"; s.
37.4 k.; cpl. 276; a. 5 5", 10 21" tt.; cl. Gleaves)

Grayson (DD 435) was laid down 17 July 1939 by the
Charleston Navy Yard, S.C.; launched 7 August 1940;
sponsored by Mrs. Alice Gertrude Gordon Harrison,
widow of Rear Admiral George Leslie Harrison; and com-
missioned 14 February 1941, Lt. Comdr. T. M. Stokes
in command.

Grayson shook down along the New England coast and in
Chesapeake Bay, then operated in the Atlantic. Grayson
joined Destroyer Division 22 of the Atlantic Fleet. On 28
August the new destroyer became flagship of Destroyer
Division 11 operating in the Caribbean and in the North
Atlantic waters between Newfoundland and Iceland 20
October.

After 3 months patrolling and protecting convoys in
the icy North Atlantic, Grayson was ordered to the Pacific
to join an American fleet battered but resolutely carrying
the war to the enemy. She sailed from San Diego 2
April 1942 as part of Hornet's escort and rendezvoused
at sea with Enterprise under Admiral William "Bull"
Halsey. From this fast carrier force, steaming 800
miles from the Japanese home islands, General Doolittle
launched his famed B-25 raid on Tokyo 18 April, bringing
war to the enemy's own land. The task group sailed
into Pearl Harbor 25 April, almost immediately for
repairs in California, but soon returned to the Pacific war.

Grayson found herself with a fast carrier force
from Pearl Harbor 15 July to escort Enterprise. Reaching
Guadalcanal via Tongatabu 7 August 1942, the carriers
launched their planes to cover Marine landing parties
there. America's first major blow of the war on the
road to Japan; and then operated in the area to block
Japanese reinforcements. As they maneuvered, Enterprise
was hit by Japanese bombs 24 August in an action-filled
half-hour which saw Grayson shoot down two planes
and damage a third. The task group dispersed. Enterprise
returned to Pearl Harbor for repairs.

The battle-scarred ship and crew remained in the bitterly
contested waters around Guadalcanal for nearly 8 months
in a variety of troop transports and other staging
duties. The versatile Grayson convoyed loaded with
reinforcements from Noumea to Guadalcanal, patrolled in
"The Slot," served as a radar picket ship, and performed
valuable rescue work for survivors from DD Meredith,
sunk by aerial torpedo 15 October. Grayson picked up
75 survivors from Meredith, sunk by aerial torpedo 15
October, escort the large Vireo, loaded with des-
perately needed fuel and ammunition, to Guadalcanal.

Returning to Pearl Harbor 15 April 1943 for overhaul,
Grayson continued on to the States for further repairs
and finally sailed to New Caledonia, arriving 24 Septem-
ber. After 3 months of patrol duty, Grayson escorted
large loaded with evacuees from Kolom-
bangara during three nights of action. 29 September-3
October, under Commander A. D. Chand-
ler. Grayson sailed for Puget Sound Navy Yard 16
December for overhaul.

Grayson returned to the Pacific, putting in at
Majuro Atoll, Marshall Islands, 10 February 1944. Patrol
duty in the Marshalls occupied 6 months. On 30 March
Grayson supported initial assault landings on Pityilu Island
Admiral William "Bull" Halsey. 21 April she was fighter-
director ship for landings at Tanamerah Bay, Dutch New
Guinea. She bombarded Biak Island 27 May and Numfor
Island
2 July prior to invasion landings.

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[HANDWRITTEN: 1 ST COPY]

FF12-10/A16-3(5) SUBMARINES, PACIFIC FLEET Vd
Serial 0265 c/o Postmaster,
San Francisco, California,
DECLASSIFIED March 10, 1942.

COMSUBPAC PATROL REPORT NO. 13
U.S.S. GRAYLING - 1ST WAR PATROL

From: The Commander Submarines, Pacific Fleet.
To : Submarines, Pacific Fleet.

Subject: U.S.S. GRAYLING (SS209) - FIRST WAR PATROL.

Enclosure: (A) Copy of GRAYLING War Patrol Report.
(B) Copy of Comsubdiv Sixty-Two Conf ltr
FB62/A16-3 Serial 021 of March 7, 1942.
(C) Copy of Comsubron Six Conf ltr FF12-10
(6)/A16-3 Serial 074 of March 7, 1942.

1. GRAYLING completed reconnaissance of Northern
Gilbert Islands by the time specified and while the information
was of negative character, it was important to the forces about
to attack the Marshalls-Gilberts.

2. To date, this sixty-one day patrol is the long-
est made by any of our submarines, and the performance of
material and endurance of personnel was excellent. Sixteen
days were spent submerged enroute to and from station, many of
which days, submergence was unnecessary and only reduced the
effective time on station and prolonged the patrol. Surface
running during daylight must be accepted when enemy air forces
are not active. It is noted that only one plane was sighted
during the sixty-one days.

3. GRAYLING missed an opportunity for fame and
glory on February 18, in the failure to launch torpedoes
against the enemy carrier HOSHO which had been reported to
the GRAYLING as proceeding toward Truk. This failure is
attributed to unnecessary deep submerged running or, if the
commanding officer felt that deep submergence was necessary,
then it is attributed to too infrequent periscope observations
resulting in practically no coverage of the area. Having pick-
ed up the carrier at approximately 5,000 yards, the failure to
have tubes ready for firing is inexcusable.

4. From the track while around Truk, it is noted

-1-

[HANDWRITTEN: 40161]

— page 9 —
FF12-10/A16-3(5)
Serial 0265
CONFIDENTIAL

SUBMARINES, PACIFIC FLEET
Vd
c/o Postmaster,
San Francisco, California,
March 10, 1942.

COMSUBPAC PATROL REPORT NO. 13
U.S.S. GRAYLING - 1ST WAR PATROL

Subject: U.S.S. GRAYLING - FIRST WAR PATROL.

that the GRAYLING was never nearer to the reef than ten miles
and then on only one occasion. It is impossible to observe any
activity submerged from this distance.

T. WITHERS.

Distribution:
Pacific List 7CM-41
List 1, Case 2
Pl(5); SSF
Atlantic List 11CM-41: SO(2)
Special: EN3(5); EN10(1); EN28(5);
ND1(2); NY1(1); NY9(1); NY10(2);
Subschool NL (8); ComsubSWPac(2);
Cominch (5).
[SIGNATURE: E.R. Swinburne]
E.R. SWINBURNE,
Flag Secretary.

— page 10 —
CONFIDENTIAL
U.S.S. GRAYLING - REPORT OF FIRST WAR PATROL PERIOD FROM
JANUARY 5, 1942, TO MARCH 6, 1942, AREAS
23 AND 15.

— page 12 —
CONFIDENTIAL
U.S.S. GRAYLING - REPORT OF FIRST WAR PATROL PERIOD FROM:
                 JANUARY 5, 1942, TO MARCH 6, 1942, AREAS
                 23 AND 15.

9.
     No major defects experienced.

10.
     Radio reception was progressively poorer with
distance. West of about 160° East longitude reception was
reliable only for the first three or four hours after sunset
because of heavy static.

11.
     Sound conditions were fair in both areas. A
destroyer and a carrier northwest of TRUK were not heard until
range was about six thousand yards.

12.
     The health of the crew was excellent. One
case of measles occurred shortly after departure but was
successfully isolated. Patrol on the surface at night and
submerged during daylight soon caused the men to get their
rest while submerged when the ship was cool and quiet. The
most favored routine was to have breakfast after submerging,
at dawn, a light meal at noon for those who were up, and the
big meal of the day after surfacing. Although some general
loss of weight was noted, the appearance and vitality of the
men was much better than had been expected.

                 Factors of endurance remaining:

                 Torpedoes | Fuel | Provisions (days) | Personnel (days)
                 21        | 3000 | 10                | 10

14.
     Expenditure of fuel caused the ending of this
patrol.

                                             ELIOT OLSEN,
                                             Lieutenant Commander, U.S. Navy,
                                             Commanding, U.S.S. GRAYLING.

3                                                  ENCLOSURE (A)

— page 13 —
FB62/A16-3
Serial 021

CONFIDENTIAL

SUBMARINE DIVISION SIXTY - TWO
Pearl Harbor, T.H.
March 7, 1942.

From: The Commander Submarine Division Sixty-Two.
To : The Commander Submarines, Pacific Fleet.
Subject: U.S.S. GRAYLING - War Patrol - Comment.

1. The material performance of the U.S.S. GRAYLING
during her long sixty-one day patrol is most gratifying. Lack
of fuel was the factor which terminated the patrol.

2. The results attained are very disappointing.
Little was gained from this patrol except for the ship's train-
ing and negative information and the excellent survey of the
Gilbert Islands. The vessel then moved through the Marshalls
and took a patrol in the Truk Area. In spite of being in
enemy waters for over a month, no vessels were sunk and only
three small merchant vessels, two sampans, one destroyer
and HOSHO were sighted. Three torpedoes were expended against
a small merchant vessel which is considered unwise. When
the small steamer was sighted on February 16th, the Command-
ing Officer might have surfaced and given chase to that
vessel in order to sink her.

3. The failure to launch torpedoes against the
HOSHO appears to be attributed to the fact that the Command-
ing Officer did not sight her in due time to start his attack.
In spite of intelligence reports previously received, he
was running at deep submergence and relying on the sound
gear entirely for contact. The Commanding Officer states,
"1345 sound operator picked up propeller bearing 340° (rel).
Ordered 60 feet depth, went to conning tower, sound bore
320° (rel) with another at 355° (rel). Second source (168rpm)
increased intensity and crossed rapidly to 020° (rel), then
recrossed to 355° (rel), first source now bearing about 300°
(rel). First periscope observation showed DD broad on port
bow and HOSHO (CV), about 340° (rel), 30° port angle, and
4 to 5000 yards range. Ordered all tubes ready and swung
ship left with full rudder. Tubes were not ready before
target passed out of effective range. (Minimum range, 2500
yards, course 240°, speed 18 knots, sea choppy, sky bright
with light clouds on horizon, wind and sea from N.E.).
Carrier had no planes on deck, none were seen in air, funnels
down, mast up with cone hoisted, ensign flying, and only
one destroyer escort about 2000 yards broad on starboard bow
of CV. Course would head toward NAMONUITO, thence 135° to
TRUIT."

-1-
ENCLOSURE (B)

— page 14 —
FB62/A16-3
Serial 021

CONFIDENTIAL

Subject: U.S.S. GRAYLING - War Patrol - Comment.

Many sound contacts have been made that have not been verified
visually and have been attributed to fish and shoal water or
reefs. It is not practical to prepare tubes for firing each
time the sound operator hears a new noise. Had this been
ordered as the sound contact was reported to the Commanding
Officer and had the preparation been expedited, it is probable
that firing could have been accomplished while the target
was within effective torpedo range. However, the probable
hits at such a range on such a fast target are a matter of
chance. Loss of this opportunity is a sad blow to morale".

4. The failure to sink the enemy on this cruise
is considered due to the fact that the vessel spent too much
time submerged, too much time below periscope depth on station
and too much submerged operations enroute to and from station.
It is noted that the focal point of enemy forces (Truk) was not
closed to close range. It is realized that the Commanding
Officer must be the sole judge of the necessity for running
submerged, but he must not overrate the capabilities of the
enemy's anti-submarine measures possible. Too much reliance
can not be placed on the sound equipment and the sound man.
Whenever practicable, search must be conducted from either
the surface or using the periscope. When it is necessary to
patrol deep, frequent observations should be made. The eye
gives a much broader horizon than the sound gear. Sound is
still the secondary means and the last resort.

5. The Division Commander has confidence in the
Commanding Officer, Officers, and the Crew of the U.S.S.
GRAYLING and feels that when they eliminate unnecessary sub-
mergence operations during the next cruise they will meet
with the highest success by locating the targets, conducting
the attack and sinking the enemy.

6. The material condition of the GRAYLING was
excellent. The health of officers and crew on return was good.
A sufficient supply of water supplied by two vapor compression
stills and copious use of a sun lamp were contributing factors.
Morale is well illustrated by the statements of officers and
men alike that but for fuel they would gladly have remained
on patrol for a chance at the enemy. It is felt that the
experience gained by the GRAYLING on this patrol will aid
in producing results on the next cruise.

Copy:
Comsubron 6.
GRAYLING.

SUBMARINE DIVISION SIXTY-TWO

Pearl Harbor, T.H.
March 7, 1942.

F. M. O'LEARY.

-2-
ENCLOSURE (B)

— page 15 —
FF12-10(6)/A16-3
Serial 074

CONFIDENTIAL

From:
To :
Subject:

1.
one days; the performance of material and the endurance of per-
sonnel on that patrol was excellent. It is to be noted that
exhaustion of fuel was the factor which terminated the patrol.

2.
Little was gained by this patrol. Information
of locations reconnoitered was nearly all negative and only
one contact which developed into an attack was made.

3.
It is regretted that an attack could not be
made on the carrier with which sound contact was made on Feb-
ruary 18th. As this was a very valuable target more detail
regarding this contact should have been included in the report.

4.
The wisdom of firing three torpedoes at what
is described as a "small motor vessel" is questioned.

5.
Too much time was spent submerged while enroute
to and from station. While the Commanding Officer must be
the judge of the necessity for running submerged - the time
submerged must be reduced to an absolute minimum in order to
increase the effective time on station.

6.
Commanding Officers must not rely upon sound
operators to locate targets. Sound equipment is affected by
so many variables that full dependence upon this gear for
search is not justified. On the contrary, search by daylight
must be conducted by frequent periscope exposures, coming to
the awash, or even surface condition when practicable in
order to broaden the horizon.

7.
Commanding Officers must realize that only by
continuous alertness and aggressive determination to locate
and sink targets can they carry out their mission of inflict-
ing maximum damage upon the enemy.

Copy to: Comsubdiv 62
          C.O. USS GRAYLING.

SUBMARINE SQUADRON SIX

c/o Postmaster,
San Francisco, California,
March 7, 1942.

The Commander Submarine Squadron Six.
The Commander Submarines, Pacific Fleet.
U.S.S. GRAYLING - Report of First War Patrol.

The GRAYLING'S patrol covered a period of sixty-

A. R. MCCANN.

ENCLOSURE (C)

— page 16 —
[HANDWRITTEN: 1ST COPY]
FF12-10/A16-3(5) SUBMARINES, PACIFIC FLEET 1d
Serial 0613 Care of Fleet Post Office;
San Francisco, California,
May 24, 1942.
COMSUBPAC PATROL REPORT NO. 28 -
U.S.S. GRAYLING - SECOND WAR PATROL
DECLASSIFIED

From: The Commander Submarines, Pacific Fleet.
To : Submarines, Pacific Fleet.

Subject: U.S.S. GRAYLING (SS209) - Report of Second
War Patrol.

Enclosure: (A) Copy of subject report.
(B) Copy of Comsubdiv 62 Conf Ltr. FF5-62/
A16-3(1), Serial 026 of May 17, 1942.
(C) Copy of Comsubron 5 Conf Ltr. FF5-6/A16-3,
Serial 0145 of May 18, 1942.

1. The Commander Submarines, Pacific Fleet, notes
with pleasure the increased percentage time that submarines are
spending on station. With such long distances to be covered
when conducting patrols off Japan from Pearl Harbor, the record
of being on station for half the patrol, such as achieved by the
GRAYLING, is excellent.

2. From information received after the return of
the GRAYLING from patrol, it appears that Japanese shipping is
being routed close in to shore in home waters. The ships are
difficult to see against the land background and submarines
have to approach within two or three miles of the beach to
pick them up. This, rather than lack of shipping in the area,
may be the reason so few ships were sighted.

3. Investigation has revealed that there were not
three duds in the 3" .50 caliber common ammunition fired. The
failure of three rounds, common ammunition, to fire was the
fault of personnel and not failure of material or ammunition.
Considering the type of target against which a submarine may
expect to effectively use its gun and the fact that 3" .50
caliber anti-aircraft (HE) ammunition will usually give good
explosive action against 1/4" to 3/4" steel plating, it is felt
that a mixture of common and anti-aircraft ammunition may prove
to be most effective. Fuzes of anti-aircraft (HE) projectiles
should be set on "safe" when using this type of ammunition
against surface targets.

DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C DECLASSIFIED
BY [HANDWRITTEN: OP-09B2c] DATE [HANDWRITTEN: 5/26/72] - 1 -

[HANDWRITTEN: 40768]

— page 17 —
1a
SUBMARINES, PACIFIC FLEET
Care of Fleet Post Office;
San Francisco, California,
May 24, 1942

FF12-10/A16-3(5)
Serial 0613

COMSUBPAC PATROL REPORT NO. 28
U.S.S. GRAYLING - SECOND WAR PATROL
CONFIDENTIAL

Subject: U.S.S. GRAYLING (SS209) - Report of Second
War Patrol.

4. The GRAYLING is credited with inflicting the
following damage on the enemy:

SUNK
1 Freighter - 6000 tons

DAMAGED
1 Sampan - 200 tons

R. H. ENGLISH.

DISTRIBUTION:
(21CH-42)
List I, Case 2:
P1(5), SSs.
Special:
EN3(5); EN10(1); EN2C(5);
Comsublant (2); Subschool, NL(3);
ComsubS.Pac(2); Cominch (5);
Combat Intel (1).

E. R. SHILBURNE,
Flag Secretary.

— page 25 —
FB5-62/A16-3(1)
Serial 026
CONFIDENTIAL

From:
To :
Subject:

SUBMARINE DIVISION SIXTY-TWO
                                                              cb
                                          Care of Postmaster,
                                          San Francisco, California,
                                          May 17, 1942.

The Commander Submarine Division SIXTY-TWO.
The Commander Submarines, Pacific Fleet.

U.S.S. GRAYLING - Report of Second War Patrol -
Comments on.

1. The second war patrol of the GRAYLING lasted
fifty-one days, and was aggressively executed. For twenty-six
days the GRAYLING was on station in enemy controlled waters which
were efficiently patrolled by sampans, aircraft, and destroyers.
This is the longest time that any submarine has spent on the
Japanese coast. The GRAYLING profited by experience gained on
the first patrol and was more effective against the enemy.

2. The aggressive action against the sampan on 11
April is highly gratifying. The poor performance of the 3"
ammunition is disappointing. Of the nine rounds fired, three
were duds. In the future, it is strongly recommended that sub-
marines carry 3" anti-aircraft ammunition instead of common, and
that they fire this ammunition using zero fuze setting.

3. On 13 April the GRAYLING sank a 6000 ton freigh-
ter with one torpedo. The freighter broke in half and then last
observed the two ends were settling towards the middle. In gen-
eral, it is futile to fire single torpedoes by con-
siderable time limit, but in the case of a slow speed ship it may
be justified where the elements of course, speed and range are
known. In general, spreads should be used at all times regard-
less of range. The miss of #4 torpedo which was fired using
enemy speed as zero is not understood. The torpedo apparently
went out on 355° instead of 0°.

4. On three occasions the GRAYLING was depth charged
without damage. The commanding officer handled his ship in an
excellent manner and evaded the enemy attacks. Although the
GRAYLING was not damaged the effect on morale after the third
attack was noticeable.

5. When the ship returned to Pearl Harbor, she
was found to be in excellent material condition. The ship was
unusually clean throughout. The health and appearance of the
officers and crew was excellent.

- 1 - ENCLOSURE (B)

— page 26 —
F55-62/A16-3(1)
Serial 026

CONFIDENTIAL
Subject: U.S.S. GRAYLING - Report of Second War Patrol -
           Comments on.

6.
     The commanding officer covered areas and
very thoroughly, however, it is believed that more con-
tacts could have been made if more time had been spent in the
close proximity to land.

7.
     This patrol was aggressively conducted. In view
of the excellent patrol conducted by the U.S.S. GRAYLING in
Bungo Suido against strong air and surface anti-submarine craft,
the excellent condition of the ship, officers, and crew upon
return, and their high state of morale, it is recommended that
the commanding officer be awarded the Navy Cross. The other
officers and men should receive suitable letters of commendation
from high authority.

Copy to:
     Comsubron SIX
     U.S.S. GRAYLING

SUBMARINE DIVISION SIXTY-TWO

eb
Care of Postmaster,
San Francisco, California,
May 17, 1942.

R. M. O'LEARY.

- 2 -
ENCLOSURE (B)

— page 27 —
FC5-6/A16-3
Serial 0146

CONFIDENTIAL

From:
To :
Subject:

SUBMARINE SQUADRON SIX
(6)/OL
Care of Postmaster,
San Francisco, Calif.,
May 18, 1942.

The Commander Submarine Squadron SIX.
The Commander Submarines, Pacific Fleet.
U.S.S. GRAYLING - Second War Patrol - Comment on.

1. The GRAYLING's second war patrol covered a period
of fifty-two days of which twenty six were spent on station and
twenty-six enroute, this is an unusually high percentage of
effective time.

2. Material performance during patrol is considered
to have been excellent. Improved techniques of cleaning stills
is resulting from experience and experimentation and can be ex-
pected to obviate derangements such as incurred by GRAYLING.

3. Health and personnel endurance were excellent;
no extremes of weather were encountered on this patrol.

4. The area in which this patrol was conducted has
not been particularly productive in the past and only three mer-
chant ships of sufficient size to warrant a torpedo attack were
sighted on this patrol; one of these was sunk, but the other
two could not be closed for an attack. A fishing sampan was
attacked with machine gun and three inch gun fire, and, while
it was probably destroyed it was still afloat when last seen.
Failure of the three inch gun to sink the sampan readily is not
understood and will be investigated with a view to increasing the
effectiveness of this weapon. This area is well patrolled by
small craft, destroyers, and planes; this has been previously
reported and should be borne in mind on future patrols. GRAYLING
was depth charged twice and attacked by bombs from a plane on
one occasion. Fortunately no material damage was caused by any
of these attacks.

5. Contacts were few on this patrol; those made were
aggressively developed. The Squadron Commander considers this
a well conducted patrol and regrets the scarcity of targets en-
countered. It is believed that the GRAYLING inflicted the fol-
lowing damage on the enemy:

One fishing sampan - Damaged and probably sunk.
One 6,000 ton freighter - Sunk.

Copy to:
Comsubdiv 62
C. O. GRAYLING

A. R. McCANN.
- 1 -
ENCLOSURE (C)

— page 28 —
[STAMP: ARCHIVES COPY]

U.S.S. GRAYLING

DECLASSIFIED

From: The Commanding Officer.
To : The Commander Submarines, Pacific Fleet.

Subject: Third War Patrol, Report of.

Reference: (a) Submarines, Pacific Fleet Confidential
Letter 8-42.

Enclosure: (A) Report of U.S.S. GRAYLING Third War Patrol.

1. In accordance with reference (a), enclosure (A) is
forwarded herewith.

Copy to: DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
CSS 6 BY [HANDWRITTEN: OP-09B9C] DATE [HANDWRITTEN: 5/26/72]
CSD 52

DECLASSIFIED

[HANDWRITTEN: 42623]
-1- ENCLOSURE (A)

— page 33 —
CONFIDENTIAL
Subject: U.S.S. GRAYLING - Report of Third War Patrol.

2. WEATHER
The usual summer prevailing trades with moderate
seas were experienced between PEARL and the MARSHALLS. In these
latter islands heavy overcast skies with frequent rain squalls
were found. In the TRUK area of NORTHEAST PASS, winds were very
light or none at all. The sea was particularly calm and most of
the time flat and glassy. Visibility was usually unlimited except
for morning and evening clouds over the islands. There was little
or no phosphorescence in the sea in contrast to what was experienced
in this area six months ago.

3. TIDAL INFORMATION
No abnormal currents were noted. The tidal currents
close to the entrance to NORTHEAST PASS were felt but not deter-
mined.

4. NAVIGATIONAL AIDS
No regular navigational lights were burning but
several times at dusk the beacon on MOEN and a few other lights
were turned on for a few seconds. Position keeping in daylight
is not difficult with the beacons, lighthouses, peaks and islands
available for fixes.

-6- ENCLOSURE (A)

— page 34 —
CONFIDENTIAL
U.S.S. GRAYLING - Report of Third Patrol.

5. ENEMY VESSELS SIGHTED

| DATE | TIME    | DESCRIPTION
T
*   * Patrol vessels were uniformly small single well deck steamers
    similar to New England Steam Trawlers with two masts and the
    single stack aft.

-7-
ENCLOSURE (A)

— page 39 —
FF12-10/A16-3
Serial 0258

CONFIDENTIAL

From: The Commander Submarine Squadron FOUR.
To : The Commander Submarines, Pacific Fleet.

Subject: U.S.S. GRAYLING War Patrol, comments on.

1. The GRAYLING returned from patrol in very poor
material condition. It is estimated that six weeks in the Navy
Yard will be required to refit her for another patrol.

2. No comment is believed necessary on the opera-
tions or tactics employed by this ship.

J. H. BROWN, jr.

— page 40 —
[STAMP: Reg. No. [HANDWRITTEN: 1971].....]
[STAMP: R.S. No. [HANDWRITTEN: 9-P1379].....]

FF12-10/A16-3(5) SUBMARINES, PACIFIC FLEET
Serial 0993

                                                                Care of Fleet Post Office;
                                                                San Francisco, California,
                                                                September 1, 1942

                                                                Jk

CONFIDENTIAL

COMSUBPAC PATROL REPORT NO. 57
U.S.S. GRAYLING - THIRD WAR PATROL.

From: The Commander Submarines, Pacific Fleet.
To : Submarines, Pacific Fleet.

Subject: U.S.S. GRAYLING (SS209) - Third War Patrol.

Enclosure: (A) Copy of subject war patrol.

1. During the twenty-four days GRAYLING spent
on patrol off Northeast Pass at Truk, there was apparently
no traffic through that Pass.

2. On August 13, 1942, four torpedoes were
fired at 0624 at a merchant type vessel, probably a sub-
marine tender. Two explosions were heard indicating two
torpedo hits. At 0633 the Commanding Officer saw this
vessel afire forward and amidships. In oral conversation
he stated that about two and a half hours later, around
0900, he again saw this vessel burning heavily amidships
and one column of smoke forward. It is regretted that
there was no follow up at 0633 to finish the kill, but it
is believed that a fire raging on board for over two and
a half hours so thoroughly damaged this vessel that she
was either destroyed or her hulk made useless for such an
indefinite period that destruction can be assumed.

3. The GRAYLING is credited with the following
damage to the enemy:

                                                                DESTROYED

1 Naval Auxiliary - 10,000 tons.

                                                                R.H. ENGLISH.

DISTRIBUTION
(21CH-42)
List I, Case 2:
Pl(5), SSs.
Special:
EN3(5); Consublant(2);
ConsubSWPac(2); Coninch(5).
[SIGNATURE: Ed Swinburne]
E.R. SWINBURNE,
Flag Secretary.

— page 41 —
[HANDWRITTEN: 1ST COPY]

U.S.S. GRAYLING

CONFIDENTIAL
Subject: U.S.S. GRAYLING - Report of Fourth War Patrol.
Period: from October 19, 1942 to December 13, 1942.
DECLASSIFIED Area: TRUK, South. Enroute Fremantle.
Operation Order: Various Despatches.

PROLOGUE :

Arrived Pearl Harbor on August 26, 1942 from Third War Patrol.
Commenced Navy Yard overhaul on August 31, 1942. SJ Radar
installed, de-gaussing cable re-installed, sound tested and
depermed. Four days training. Readiness for sea on October
19, 1942. Sailing orders directed GRAYLING proceed between
MARSHALL and GILBERT Islands. Control to pass to Commander
South Pacific Fleet on October 23, 1942.

1. NARRATIVE.

October 19
0900 (VW)
Underway and met escort, U.S.S. BOGGS, at Pearl Harbor entrance
buoys. Made trim dive and tested trim pump at deep submergence.
Surfaced and transferred to BOGGS the man from Subase E&R depart-
ment who was aboard to observe trim pump. The operation of the
pump was still unsatisfactory but decided to proceed and attempt
a ship's force repair job.
1945 (VW)
BOGGS departed.

October 20-22 Made training dives and held ship and gun drills daily. On
October 22 made Battle Surface and fired eight rounds from
3" gun.

October 23
1613 (Y)
1710 (Y)
Radar reported good contact at 4 miles. Made quick dive. We
were nearly 600 miles east of WOTJE.
Surfaced.

October 24
0342 (Y)
Received COMSOPAC despatch directing GRAYLING proceed to patrol
station off Buka passage.

October 26
Submerged while passing between MILI and MAKIN.

October 27
0707 (M)
0840 (M)
Submerged on Radar contact, 6 miles.
Surfaced.

October 28
0603 (M)
0716 (M)
0955 (M)
Submerged on sighting Jap two engine bomber distant 8 miles on
Northerly course.
Surfaced.
Received CTF7 despatch directing GRAYLING proceed to TRUK at

45403 [STAMP: FILMED] DECLASSIFIED ART. 0445, OPNAVINST 5510.1C
[HANDWRITTEN: BY OP-09B9C DATE 5/26/72] DECLASSIFIED

— page 44 —
[STAMP: CONFIDENTIAL]
U.S.S. GRAYLING
Subject: U.S.S. GRAYLING - Report of Fourth War Patrol.

November 7 Heard 3 very distant explosions.
1500 (K) Sighted small steamer or patrol vessel West of Piaunu Pass. Esti-
2104 (K) mated course 055° speed 8 knots. Lost contact in reduced visibili-
ty before favorable attack position could be attained. SJ Radar
went out of commission ten minutes before this contact.
2320 (K) Sent dispatch acknowledging increase in size of area.

November 8 Sighted probable patrol vessel bearing 280°T course 070° - 155°.
2258 (K) Proceeded to close target but he must have sighted us. He made
a large change of course and disappeared in a rain squall. SJ
still out of commission. Searched but couldn't regain contact
either by sound or sight.

November 9 Sound reported fast screws and occasional echo ranging bearing
0407 (K) 165°T. Nothing sighted.
1035 (K) Sighted patrol boat patrolling on course 270°. Lost contact at
1115.

November 10 Sighted patrol boat on regular patrol off South shore of TRUK.
1312 (K)
1830 (K) Observed a powerful display of searchlights on TRUK. The lights
searched both the horizon and the sky for about one hour.
2318 (K) Sighted a small tanker (loaded) headed towards Pinanu Pass.
Estimated course 100°T, speed 9 knots.
2328 (K) Fired two torpedoes, one hit. Target broke in half and blew up
with a large orange colored flame, sinking immediately thereafter.
2345 (K) Passed close to spot where target had been. Nothing remained but
a huge oil slick.

November 11 Another heavy searchlight search from TRUK lasting about one hour.
1830 (K) Decided to keep well to seaward when surfacing.
1945 (K) Saw glow of single searchlight about 50 miles NW of TRUK. It
was seen continuously for about 15 minutes.

November 12 Gyro Compass follow-up system failed. Commenced steering by
0215 (K) magnetic compass. Rehearsed procedure for firing surface and
submerged without use of gyro.
1840 (K) Single searchlight on TRUK made a brief sweep.

November 13 Full power searchlight sweep commenced on TRUK just as we sur-
1820 (K) faced. Lights out at 1850.

November 15 1150 - 1400 Patrol boat operating close aboard.

November 16 Gyro follow-up system working, but 180° out of phase.
0950 One patrol boat passed about 2 miles to South.
1218 Patrol boat returned headed for GRAYLING.
1230 Second patrol boat joined first. They took turns stopping and
listening. No echo ranging. 1630 left patrol boats to
- 4 -

— page 46 —
CONFIDENTIAL
                                                              U.S.S. GRAYLING

Subject:         U.S.S. GRAYLING - Report of Fourth War Patrol.

— page 48 —
[STAMP: CONFIDENTIAL]
                                                              U.S.S. GRAYLING

Subject:                                U.S.S. GRAYLING - Report of Fourth War Patrol.

— page 49 —
U.S.S. GRAYLING

CONFIDENTIAL
Subject: U.S.S. GRAYLING - Report of Fourth War Patrol.

2. WEATHER
The weather around TRUK was generally clear during the daytime
with frequent rain squalls at night. The sea was usually
glassy. White caps were present only three days during the
month. From Djailolo Pass to Kupang Bay the visibility was
generally fair to poor, a heavy overcast prevailing.

3. TIDAL INFORMATION
No abnormal tides were encountered. Around TRUK an Easterly
set of about ½ knot was experienced South of Latitude 7°
North and a Westerly set (Max. 1 knot) was experienced North
of that Latitude.

4. NAVIGATIONAL AIDS
No regular navigational aids were in operation. The high peaks
in the Kjailolo Pass - Kupang area gave good radar indications
and the Passes were navigated on the surface at night without
great difficulty.

- 9 -

— page 51 —
[STAMP: CONFIDENTIAL]

                                                                U. S. S. GRAYLING

Subject:        U.S.S. GRAYLING - Report of Fourth War Patrol.

— page 55 —
[STAMP: SECRET (typed over CONFIDENTIAL)]
CONFIDENTIAL

U.S.S. GRAYLING

Subject: U.S.S. GRAYLING - Report of Fourth War Patrol.

10. MAJOR DEFECTS EXPERIENCED

     Some important repair work was in progress throughout most of the patrol.
Periods of long hours without adequate rest were spent by the electricians,
radiomen and auxiliary men in accomplishing these repairs.

     The Engineering Officer, Lieutenant R. A. Bonin, is deserving of commendation
for the many hours he spent in supervising this work and for his ingenuity in
improvising where material and facilities for complete repair were not available.

     (a) TRIM PUMP: During the training period following Navy Yard overhaul
it was found that this pump made an excessive amount of noise and would
not pump at deep submergence. It was checked over by the Submarine Base
Repair Force but was not improved. The Ship's force worked on this pump
during the first four days of this patrol and found that the holes in
the motor base were larger than the bolts, causing the weight of the
motor to be carried by the pump thrust bearing. This situation was
temporarily alleviated.

     Even at its best this pump and the drain pump are too noisy to be
used in the vicinity of enemy patrol craft.

     (b) AIR LEAKS: During the first all day dive a large air bubble accumulated
in No. 5 MBT. By trial and error it was found that by bleeding down a group
of three of the ten HP air bottles in No. 4 bank the leakage was eliminated.
All external HP air connections were silver soldered during the Navy Yard
overhaul.

     (c) PITOMETER LOG: This equipment was removed for overhaul and re-installed
by the Navy Yard. During the first few days of the patrol water leaked from
the back cover of the Mercury Differential Manometer gear chamber. Some of
the bolts holding this cover were so badly corroded that they broke while
being removed by hand.

     (d) SOUND TRAINING MOTORS: During torpedo firing on October 29th an excessive
amount of water was taken in through the poppet valves. During the subsequent
silent running, a large up angle (resulting from exhaust valve leakage into
the engine room) sent this water to the after end of the torpedo room. Both
sound training motors were grounded out.

     Both motors were removed, cleaned and dried out. For one motor it was
found that the main field coils required replacement. Spare purifier pump motor
coils were used for this purpose.

     Recommend installation of a partial bulkhead about one foot high at
frame 32 to prevent repetition of this casualty.

- 15 -

— page 58 —
CONFIDENTIAL
                                                                U.S.S. GRAYLING

Subject:             U.S.S. GRAYLING - Report of Fourth War Patrol.

— page 59 —
S-E-C-R-E-T
CONFIDENTIAL
U. S. S. GRAYLING

U.S.S. GRAYLING - Report of Fourth War Patrol.

11. RADIO RECEPTION

(a) NPM: Reception was good on high frequencies, especially 8230 Kcs.
during patrol in Truk area even though antenna system was grounded due to a
broken bowl insulator by depth charging early in the patrol. Signal strength
on 26.1 kcs. was good but static made shifting to high frequencies necessary
most of the time.

(b) BELCONNEN: Reception was excellent on 44.8 kcs. and it was seldom
necessary to shift to high frequency except during the periods this frequency
was secured and tehn reception was very good on 12330 kcs.

(c) VIXO, Radio Perth: Excellent reception on all frequencies, 9250
kcs. being used mostly. The policy of devoting a few minutes each night to
the transmitting of news items was much appreciated by all hands.

(d) TIME TICKS: Received from NPM on 12330 kcs. but weekly. At times
no signals could be received. Time Ticks received from Radio Perth without
difficulty.

Last Message Received from CTF7 - Reptile, 260303
from Radio Perth - Serial 93, 111000

Last Message Sent to CTF7 - Guide, 061600
to Radio Perth - 081200

12. SOUND CONDITIONS AND DENSITY LAYERS: Around TRUK sound conditions were
excellent. Ships could be heard from 8000 to 12,000 yards, echo ranging could
be heard from twelve miles.

A heavy layer was found to exist from depths of 217 to 265 feet. No A/S
vessel encountered was able to maintain contact with the GRAYLING running
silently in this layer.

Off KUPANG BAY sound conditions were poor. The vessel attacked was not
heard at 3500 yards.

13. HEALTH AND HABITABILITY: Only a few minor illnesses and injuries
occurred during this patrol.

Habitability was in general good except during periods of silent
running.

The frequent depth charging, plus periods of silent running, plus long
hours spent on repairs noticeably accelerated the fatigue and nervous tension.
Without exception, all hands conducted themselves admirably throughout these
bad periods. For one-third of the officers and crew this was their fourth
successive war patrol, plus four weeks out at the Battle of Midway. More than
half the officers and crew have made three or more patrols.

- 19 -

— page 61 —
FC5-6/A16-3
Serial #00-48

FIRST ENDORSEMENT to
C.O. GRAYLING 4th War
Patrol of 12/13/42.
[STAMP: CONFIDENTIAL]

SUBMARINE SQUADRON SIX

(6)/OL

U. S. S. TAUTOG, Flagship,
December 20, 1942.

From: The Commander Submarine Squadron SIX.
To : The Commander Task Force FIFTY-ONE.

Subject: U.S.S. GRAYLING - Fourth War Patrol - Comment on.

1. Forwarded. The Grayling's fourth war patrol was made
incident to her transfer from Submarines, Pacific Fleet, to Submarines,
Southwest Pacific. This patrol covered a period of fifty-six days and in-
cluded a twenty-eight day patrol off TRUK.

2. Grayling is currently being refitted by Pelias. It
is believed that the major material difficulties experienced during the
patrol resulted from faulty adjustments rather from inherent weakness of
any particular design features other than in the instance of the trim pump.
The unsatisfactory performance of trimming pumps is consistently reported
by submarines returning from patrol and these units are always found to
be in need of extensive overhauls during tender refits. Modification of
the design of these pumps to eliminate noisy operation has been authorized
and will be undertaken upon receipt of necessary plans and material.

Derangement of main vent gaskets as a result of depth
charging is the first reported since modification of the gasket grooves.
While there are no retaining rings incorporated in the design of main vents
in Government built boats, the absence of failures in this respect in other
submarines of similar design leads to suspicion of faulty installation in
this instance and immediate alteration is not recommended until more conclu-
sive evidence of the necessity therefor is at hand.

The partial bulkhead or cofferdam suggested in para-
graph 10(d) is being installed for trial in Grayling.

The Squadron Commander is heartily in accord with the
Commanding Officer's recommendation concerning the necessity of furnishing
each submarine with a competent radar technician but realizes that the Sail
Jig equipment is extremely new and that opportunity to train personnel in
this equipment has been short. A radar school is functioning in this area
and an increase in the number of trained radar personnel available is to be
expected as more opportunity to gain experience presents itself.

The leaking of exhausts valves as reported by Grayling
has been found to be preventable to a large degree by suitable routining
during the patrol.

- 1 -

— page 62 —
FC5-6/A16-3
Ser. #00-48
[STAMP: CONFIDENTIAL]
FIRST ENDORSEMENT
Subject:

(6)/OL

SUBMARINE SQUADRON SIX

U.S.S. TAUTOG, Flagship,
December 20, 1942.

U.S.S. GRAYLING - Fourth War Patrol - Comment on.
(Continued)

3. Health and habitability were good on this patrol; no
serious illness occurred, but the Commanding Officer reported that depth charging,
silent running and long hours of repair work noticeably increased fatigue and
nervous tension.

4. This was an active patrol; twenty-nine contacts were
made with enemy surface craft and seven with aircraft. Six torpedo attacks
and one gun attack were made. The Grayling was depth charged on six occasions
and on one occasion was attacked by gun fire by a destroyer. The percentage
of hits obtained was low; of fifteen torpedoes fired, only three hits were
obtained; on three attacks torpedoes were fired from ranges of three thousand
yards or more. No defective torpedo performance was reported; the Commanding
Officer attributed his misses to control errors and to evasive action by the
target. While his torpedo fire left much to be desired, the Grayling is to
be commended for his determined efforts to attack all targets sighted. The
Grayling is credited by the Squadron Commander with the following:

1 9,000 ton AV - Damaged.
1 5,267 ton AO - Sunk
1 two masted schooner - Sunk

[SIGNATURE: A. R. McCann]
A. R. MCCANN.

- 2 -

— page 63 —
A16-3
Serial 00160
[STAMP: CONFIDENTIAL]
SECOND ENDORSEMENT to
CO GRAYLINGS 4th War
Patrol of 12-13-42.

From:
To :
Via :

Subject:

1.
Submarine SIX.

2.
drain pumps due to excessively noisy operation is general in
submarines and is a matter of great concern to the Force Commander,
as it precludes the use of these pumps during the periods when it
is necessary for a submarine to resort to "silent" running and
frequently results in a severe handicap to efficient operation.
A pump specifically designed for quiet operation is badly needed.
The alterations referred to by Commander Submarine Squadron SIX
in his endorsement are not considered to be the answer to this
problem, since the purpose of these alterations is to isolate the
sound of an inherently noisy piece of machinery. The Bureau of
Ships is known to be cognizant of this situation and is proceeding
to develop a suitable type pump. The situation is serious and
this project should receive the highest possible priority.

3.
their seats while on patrol should reduce the leakage of these
valves to a minimum.

4.
casualties occurred, the correction of which naturally resulted in
reduction of the normal endurance of personnel. GRAYLING personnel
are to be commended for the manner in which they effected repairs
to main ballast tank vents 5A and 5D.

5.
are believed to be: For attacks 1 and 6, control errors; for
attacks 4 and 5, evasive action by the target. The following
damage to the enemy resulting from this patrol is credited to
the GRAYLING:

Sunk
Sunk
Damaged

DISTRIBUTION ON REVERSE
OF THIS SHEET [UNCLEAR: MMANDER] ALLIED NAVAL FORC[UNCLEAR: ES]
WESTERN AUSTRALIA
Ly
December 23, 1942.

The Commander TASK FORCE FIFTY ONE.
The Commander in Chief, U.S. FLEET.
The Commander Southwest Pacific Force.

U.S.S. GRAYLING - Fourth War Patrol - Comment on.

Forwarded concurring in the comments of Commander

The unsatisfactory performance of both the trim and
is general in
the Force Commander,
the periods when it
" running and
cient operation.
is badly needed.
ine Squadron SIX
answer to this
is to isolate the
The Bureau of
to develop a suitable type pump. The situation is serious and
this project should receive the highest possible priority.

Routine rotating of main engine exhaust valves on
on patrol should reduce the leakage of these

It is unfortunate that so many minor material
the correction of which naturally resulted in
normal endurance of personnel. GRAYLING personnel
for the manner in which they effected repairs

The causes of the torpedo misses for this patrol
For attacks 1 and 6, control errors; for
evasive action by the target. The following

1 - 5,267 ton AO.[HANDWRITTEN: ✓]
1 - 150 ton two-masted schooner.
1 - 9,000 ton AV.

[SIGNATURE: C.A. Lockwood, Jr.]
C.A. LOCKWOOD, Jr.

— page 64 —
A16-3
Serial 0017
CONFIDENTIAL
S-E-C-R-E-T

SOUTHWEST PACIFIC FORCE

[STAMP: Reg. No. 1 01651]
[STAMP: F.S. No]

January 8, 1943.

THIRD ENDORSEMENT to:
C.O. GRAYLING's 4th War
Patrol of 12-13-42.

From: The Commander Southwest Pacific Force.
To: The Commander in Chief, U.S. FLEET.

Subject: U.S.S. GRAYLING - Fourth War Patrol - Comment on.

1. Forwarded.

J. CARY JONES,
Chief of Staff.

[STAMP: COMMANDER IN CHIEF
U.S. FLEET
RECEIVED
43 JAN 25 14 23]

Copy to:
VCNO

[STAMP: CONFIDENTIAL]
[STAMP: FILMED]

[STAMP: CLASSIFICATION THIS CORRESPONDENCE
CHANGED TO [HANDWRITTEN: CONFIDENTIAL]
AUTHORITY [HANDWRITTEN: F.O. 9.]
DATE [HANDWRITTEN: 1-25-43]]

— page 65 —
[HANDWRITTEN: 1ST COPY]

U.S.S. GRAYLING

SS209/A16-3 February 24, 1943.

[STAMP: DECLASSIFIED]
[STAMP: CONFIDENTIAL]

From : The Commanding Officer.
To : The Commander-in-Chief, U.S. Fleet.

Via : Official Channels.

Subject: Patrol Report (Fifth War Patrol).

Enclosure: (A) Patrol Report, Period January
7, 1943 to February 24, 1943.

1. Enclosure (A) is forwarded herewith.

[SIGNATURE: J.E. Lee]
J.E. LEE.

DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
BY [HANDWRITTEN: OP-09BG] DATE [HANDWRITTEN: 5/26/72]

[STAMP: DECLASSIFIED]

[HANDWRITTEN: 50371E]

— page 66 —
U.S.S. GRAYLING

CONFIDENTIAL
U.S.S. GRAYLING - REPORT OF FIFTH WAR PATROL.

PERIOD: FROM JANUARY 7, 1943 TO

AREA : VERDE ISLAND PASSAGE - MANILA BAY AREA.

OPERATION ORDER NO. 1-43.

GRAYLING arrived Fremantle on December 13,
1942 from Fourth War Patrol. Re-fit by
U.S.S. PELIAS. Readiness for sea January
3, 1943. Departure delayed by attempts
to repair fathometer. Directed proceed
vicinity MANILA BAY via LOMBOK and MAKAS-
SAR STRAITS, SIBUTU PASSAGE and MINDORO
STRAIT. Carried twenty torpedoes.

1. NARRATIVE

January 7
1300 (I) Underway from Fremantle. Conducted sound train-
ing runs for H.M.A.S. HORSHAM. Made two daylight
practice approaches and three night approaches.

January 8
0006 Exercises completed. Departed from exercise area.
0802 Sighted PBY. Recognition signal exchanged. Made
training dive. Conducted general drills.
NOON LAT. 29° 30'S; LONG. 113° 29'E.
Distance run 173. Fuel expended 2792.

January 9
0802 Sighted PBY.
0900 Made training dive. Held drills.
0930 Battle Surface.
NOON LAT. 25° 07'S; LONG. 112° 27'E.
Distance run, surface 273; sub. 7. Fuel ex-
pended 3153.

January 10
0700 Sighted PBY. Recognition signals exchanged.
0703 Moored to fuel barge Exmouth Gulf.
1105 Departed Exmouth Gulf.
1711 (H) NOON POSITION - Exmouth Gulf.
Distance run 310. Fuel expended 3458.
Fuel received 8455.

January 11
Conducted drills. Made training dive.
NOON LAT. 18° 16'S; LONG. 114° 31'E.
Distance run 251. Fuel expended 2580.

-1-

— page 78 —
CONFIDENTIAL
U.S.S. GRAYLING

Subject:
Patrol Report (Fifth War Patrol).
heard to join the first and they alternated in
stopping to listen. A total of 39 depth charges
were dropped.
1815
Last depth charge.
1908
Surfaced. Connenced departure from area in accord-
ance with instructions.
NOON LAT. 14° 11'N; LONG. 120° 25'E.
Distance run, surface 64; sub. 30. Fuel expended 650.
February 14
0542
Submerged in APO EAST PASS.
1832
Surfaced.
NOON LAT. 11° 57'.5N; LONG. 121° 04' 18"E.
Distance run, surface 150; sub. 34. Fuel expended 2460.
February 15
0712
Lookout reported plane crossing stern. Submerged.
0756
Surfaced.
1904
Sighted LAPARAN ISLAND bearing 153°T, 10 miles.
1950
DOC CAN ISLAND abean to port.
2302
Entered SIBUTU PASS.
NOON LAT. 7° 47'N; LONG. 120° 04'E.
Distance run, surface 248; sub. 19. Fuel expended 3628.
February 16 On the surface all day.
1644
Sighted 2 small sail boats bearing 180°T. Worked
around them to Eastward.
1811
NORTH WATCHER abean to port.
NOON LAT. 2° 04'N; LONG. 119° 26'Ε.
Distance run, surface 344; sub. O. Fuel expended 4811.
February 17 Ran on surface off coast of CELEBES ISLAND. Encoun-
tered several small sail boats.
NOON LAT. 2° 59'S; LONG. 118° 19'E.
Distance run, surface 322; sub. O. Fuel exponded 3772.
February 18
0820
Passed SEKALO ISLAND abeam to starboard.
0957
Sighted BALI ISLAND.
1013
Sighted LOMBOK ISLAND.
1022
Radar contact, plane, 9 miles. Submerged.
1839
Surfaced.
1935
Sighted sail boat to Westward.
2059
Commenced transit of LOMBOK STRAIT.
2125
Sighted dark object, probably a sail boat, in the
Strait.
2345
Completed transit of LOMBOK STRAIT.
NOON LAT. 7º 22'.5S; LONG. 116° 16'E.
Distance run, surface 310; sub. 5. Fuel expended 3551.
February 19 NOON LAT. 11° 17'S; LONG. 115° 05'Ε.
Distance run, surface 204; sub. 20. Fuel expended 3061.

-13-

— page 80 —
CONFIDENTIAL
U.S.S. GRAYLING

5. DESCRIPTION OF ENEMY WARSHIPS OR MERCHANT SHIPS SIGHTED:

| Date | Position | Initial Course | Est. Length | Description |
| and | | Range | and | Masthead | |
| Time | | and AOB | Speed | Length | |
| Jan 21 | L14-16N | 14000 | 222° | 325 ft. | Flush deck freighter of |
| 1454 | L120-28E | 30S | 162° | 100 ft. | about 4000 tons. Goalpost, |
| | | | 10-14 | | funnel. Composite super- |
| | | | | | structure. Counter stern. |
| | | | | | Camouflaged, commenced ap- |
| | | | | | proach. At 5500 yds. target |
| | | | | | c/c 60° to left and increased |
| | | | | | speed from 10 to 14 knots. |
| Jan 21 | L14-16N | | 222° | 160 ft. | Single stack. Two masts of |
| 1505 | L120-28.5E | | 10 | 65 ft. | same height. May be a conver- |
| | | | | | ted yacht. Similar to U.S.S. |
| | | | | | CORAL. Seen daily off CORREG- |
| | | | | | IDOR. Served as patrol and |
| | | | | | escort vessel. |
| Jan 25 | L13-23N | 10000 | 322° | 350 ft. | Freighter of about 5000 tons. |
| 2215 | L121-32E | 25°S | 14.5 | | Goalpost funnel goalpost |
| Jan 26 | L13-31N | 16000 | 125° | 325 ft. | Night periscope attack missed. |
| 1201 | L121-17E | 40°P | 6 | 100 ft. | Cargo vessel similar to NA- |
| | | | | | GANO MARU. Mast, funnel, mast, |
| | | | | | high crow's nest forward. |
| | | | | | Deck cargo forward and aft, |
| | | | | | covered with brown tarpaulins. |
| | | | | | Number 477 on side of bridge. |
| | | | | | Attacked and sank it. |
| Jan 27 | L12-43.5N | 15000 | 130° | 400 ft. | Combination pass. freighter |
| 1617 | L121-56E | 50°S | 110° | | similar to PALAU MARU. Mast |
| | | | 10 | 100 ft. | funnel mast. Colors at main- |
| | | | | | mast were dark. May have been |
| | | | | | Naval Ensign. Many idlers on |
| | | | | | deck. Very clean and neat |
| | | | | | appearance. Attacked and |
| | | | | | sank it. |
| Jan 29 | L13-23N | 10000 | various | 120 | Patrol boats - ex-catcher |
| 1226 | L121-28E | | 8-9 kt. | 60 | type fishing boats of about |
| | | | | | 250 tons. Small gun in bow |
| | | | | | depth charges aft. Found |
| | | | | | frequently in both |
| | | | | | VERDE ISLAND and MANILA BAY |
| | | | | | areas. |
| Feb 1 | L14-14N | 12000 | 170° | 250 ft. | Coastwise steamer of about |
| 1522 | L120-29.5E | 80°S | 10 | 75 ft. | 2000 tons. Mast funnel mast. |
| Feb 3 | L14-09N | 11000 | 350° | 200 ft. | Unable to close. |
| 1027 | L120-32E | 10°P | | 75 ft. | Mast funnel mast small gun |
| | | | | | in bow. Large crow's |
| | | | | | nest. About 1000 tons. Made |
| | | | | | approach but did not fire at |
| | | | | | est. draft too shallow for |
| | | | | | torpedo. |
| Feb 3 | L14-11N | 9000 | 170° | 200 ft. | Engines aft type about 2000 |
| 1515 | L120-30E | 50°S | 12 | 60 ft. | tons. Could not tell whether |
| | | | | | oiler tanker or coastwise |
| | | | | | steamer. Made approach mini- |
| | | | | | mum range 3600 yds. |
| | | | | | -15- |

— page 81 —
CONFIDENTIAL                                U.S.S. GRAYLING

DESCRIPTION OF ENEMY WARSHIPS OR MERCHANT SHIPS SIGHTED

Date        Position        Initial Course Est. Length
and                         Range        and Masthead
Time                        and AOB      Speed Length        Description
Feb. 3      L14-11N         170°         9000         150 ft.      Naval craft of about 250
            L120-30.5E      30°S         10           50 ft.       tons either converted yatch
1533                                                               or Sub-chaser. Too small
                                                                   for torpedo.
Feb 11      L14-15N         040°         7900         350 ft.      Freighter of about 4000 tons
            L120-27E        80°S         11           100 ft.      Goalpost funnel.
0913                                                               Minimum torp. run 4000 yds.
                                                                   Did not fire.
Feb 11      L14-16.5N       223°         16000        425 ft.      Freighter of about 6000 tons.
            L120-28.5E      5°P          11           110 ft.      Mast funnel mast. Small com-
1349                                                               pact superstructure. Flush
                                                                   deck. High stick masts with
                                                                   triangular crosstrees. High
                                                                   stack. Probably a coal burner.
                                                                   Hit amidships with one torp.
                                                                   Left sinking. This was lead-
                                                                   ing ship of 5-ship convoy.
Feb 11      L14-16.5N       223°         16000                     4 freighters of 4-6000 tons
            L120-28.5E      5°P          11                        each. Details of individual
1349                                                               ships not noted. These were
                                                                   in convoy with above.
Feb 11      L14-16.5N       223°         14000        200 ft.      Engines aft ship of about
            L120-28.5E      0°           11           60 ft.       1500 tons with two circular
1355                                                               gun mounts forward and two
                                                                   aft. Lots of lookouts in
                                                                   white uniforms. Escort for
                                                                   above convoy. Made depth
                                                                   charge attack.
Feb 13      L14-11N         90°          12000        500 ft.      Probably KAMAKURA MARU. Painted
            L120-17E        70°S         15           120 ft.      grayish-brown. Unable to close.
0855
Feb 13      L14-13.5N       315°         16000        220 ft.      Q-Ship. Mast, goalpost, funnel,
            L120-26E        5°S          11           95 ft.       mast. Of about 2000 tons.
1216                                                               Depth charge racks on stern
                                                                   looked like lumber. Gun crew
                                                                   aft in dark clothes. Equipped
                                                                   for listening but not echo
                                                                   ranging. Carried probably 40
                                                                   depth charges.

6. AIRCRAFT SIGHTED

Date        Time        Position            Bearing Dist. Course Altitude Designation
Jan 8       0802        Lat 30-12S          260°    8 mi  315°   2500 ft. PBY
                        Long 113-58E
Jan 9       0802        Lat 25-58S          090°    8 mi  000°   2000 ft. PBY
                        Long 112-29E
Jan 10      0700        Exmouth Gulf        120°    10 mi 000°   2500 ft. PBY
Feb 1       1545        Lat 14-14N          100°    3 mi  var.   300 ft

— page 82 —
CONFIDENTIAL
U.S.S. GRAYLING

AIRCRAFT SIGHTED

Date Time Position Bearing Dist. Course Altitude Designation
Feb 15 0712 Lat 8-58N 005° ? 270° ? Unidentified
           Long 120-16E                                 Possibly a
                                                        Bird.
Feb 18 1022 Lat 7-18S ? 9 mi ? ? Radar contact
           Long 116-17E                                 plane not
                                                        sighted

7. PARTICULARS OF ATTACKS

                                        ATTACK #1                 January 25, 1943.

LAT. 13° 23'N                           LONG. 121° 32'E
:                                       :
Tube No.        : 4 :                   : 3 :           : 5 :           : 2 :
:                                       :
Gyro Angle      : 037° :                : 024° :          : 016° :          : 011° :
:                                       :
Track Angle     : 138°S :               : 142°S :         : 140°S :         : 139.5°S :
:                                       :
Depth           : 4 ft. :               : 0 ft. :         : 0 ft. :         : 4 ft. :
Target Speed
Setting on TDC  : 15 kts. :             : 16.5 kts. 13.5 kts. 12 kts. :
:                                       :
Enemy course: 322°T :                   : Enemy Speed: 14.5 kts. :
:                                       :
Firing Range: 1200 Yds.: Firing Interval: 7 sec. :

        This attack was made on a medium sized freighter at the South-
east entrance to Verde Island Passage. Because moon was behind us,
decision was made to conduct submerged approach and GRAYLING dived
with the target bearing 343° (Rel.), Angle on Bow 20°S, range about
7000 yards. Changed course after diving to close target with 90°S
track. When target could be made out in the periscope it appeared
much closer than had been expected (range about 800-900 yards, AOB
90°S). Gave right full rudder and went to standard speed to reduce
gyro angles. Commenced firing 1 minute later (2239 Hypo) with gyro
and track angles as shown in table. Point of aim was stack. Used
target speed settings as shown in table, cranking in new speed and
new periscope bearing before each shot. Sound operator heard all
torpedoes leave tubes and followed one out. This torpedo apparently
ran on proper course. 5 1/2 minutes after firing the last torpedo
a loud explosion was heard and the target immediately changed course
about 30° to the right, resuming original course a few minutes
later to enter Pass.

        Spread of salvo was obtained by setting target speed on TDC
at different value for each shot, using best estimate of speed as
mean.

-17-

— page 83 —
CONFIDENTIAL
U.S.S. GRAYLING
ATTACK #2
January 26, 1943.
Lat. 13° 26'N
Long. 121° 16'E
:
:
:
:
: Tube No.
:
1
:
2
:
:
Gyro Angle
:
002.50
:
:
:
002.75°
:
:
:
:
: Track Angle
:
90°P :
90°P
:
:
:
':
:Depth Setting
:
O ft.
:
4 ft.
: Target Speed
:
:
::
:Setting on TDC
:
6.4 kts.:
4.9 kts.
:
:
:
:Enemy course: 125°T
: Enemy Speed:
5.6 kts.:
:
:
:
Firing Range: 900 yds : Firing Interval: 9 sec.:
Attack was made on a freighter similar to NAGANO MARU
standing out of Verde Island Passage on a Southeasterly course.
Sighted target at about 16000 yards, angle on bow 40°P. Came
to normal approach course and full speed to close track.
Slowed and made observation about every 6 minutes. After
about 25 minutes of this the range was still 8000 yards with
50°P angle on bow. It was then apparent that the target was
making slow speed and we would have no difficulty in closing
since he was close to the beach and could not zig away much.
Slowed to 1/3 for closing. Target zigged 15° right at 20
minutes, 15° left at 33 minutes, 15° right at 45 minutes,
10° left at 56 minutes. At 60 minutes came right to course
for 90° track and reduced speed. Range 4500 yards, distance
to track 2250 yards. At 74 minutes (1324 Hypo) fired two
torpedoes using target speed settings, gyro angles and depth
settings as per table above. Spread obtained by varying tar-
get speed. New periscope bearing cranked in TDC before each
shot. Point of aim was stack. Sound operator followed tor-
pedoes out on proper course and one explosion was heard 34
seconds after firing second torpedo (44 seconds after first).
Believe first torpedo was the one which hit. Target sank
immediately, bow first, and disappeared 64 seconds after
the explosion.
Vessel had 2 masts, 1 funnel, 1 deck, well deck, counter
stern, composite superstructure, boom on after mast. Carried
Japanese character followed by numerals 477 painted on side of
the bridge.

-18-

— page 84 —
CONFIDENTIAL U.S.S. GRAYLING January 27, 1943

ATTACK #3

Lat. 12° 43'N Long. 122° 01'E

:Tube No. : I : 2 : 3 :
:           :   :   :   :
:Gyro Angle : 004.5° : 004.75° : 004.75° :
:           :   :   :   :
:Track Angle : 115°S : 115°S : 115°S :
:           :   :   :   :
:Depth Setting : 0 ft. : 0 ft. : 0 ft. :
:Target Speed :   :   :   :
:Setting on TDC : 10.5 kts.: 9 kts. : 7.5 kts.:
:           :   :   :   :
:Enemy Course: 113°T : :Enemy speed: 9 kts.:
:           :   :   :   :
:Firing Range: Est. 2000 Act. 1500:Firing Interval:10S:

Attack was made on medium sized passenger-freighter (about
4500 tons) coming down TABLAS STRAIT bound for ROMBLON PASS.
Actual attack took place 5 1/2 miles South of CORCUERA LT.,
SIMARA IS. Range on sighting was about 15000 yards with 50°
angle on Bow. Came to normal approach course and went to full
speed. Slowed and made observations about every 8 minutes.
At 33 minutes observation showed target had changed course 25°
to the left, range 2350. Decided there was not time to come
left for 90° track so came to course for 110°S track. At
55 minutes (172° Hypo) fired 3 torpedoes with target speed
settings, gyro angle and depth settings as per table above.
Spread obtained by varying target speed. Sound operator
followed torpedoes out on proper course. 60 seconds after
firing first torpedo heard explosion. 6 seconds later heard
second explosion. Believe first and second torpedoes hit.
Target sank stern first shortly after the second torpedo hit.

Vessel had one funnel, two decks, flush deck, counter stern.
Appeared to have considerable passenger space. Similar to
PALAU MARU.

-19-

— page 85 —
CONFIDENTIAL
U.S.S. GRAYLING
ATTACK #4
February 11, 1943.
Lat. 14° 16'.5N : Lon.: 120° 28'.5E :
: Tube No. : 10 : 7 :
:Gyro Angle : 177.2° : 178° :
:Track Anglo : 89.2°S : 90°S :
:Depth Setting : 0 ft. : 0 ft. :
:Target Speed : 12.5 kts. : 11 kts. :
:Setting on TDC : : :
:Emay Course: 223° : Enemy speed: 11.5 kts. :
:Firing Range: 1750 yds. Firing Interval: 8 sec. :

Sighted smoke in North Channel at 1338 Hypo. This de-
veloped into a convoy of five ships in column, preceded by an
escort, standing out of Manila Bay. Range on commencing
approach on leading MARU, 16000 yards, angle on bow zero.
With range about 4500 yards, angle on bow 2°P, came left
to course for stern shot with 90°track. At 1426 fired two
torpedoes with data as per table above. Point of aim was
stack. Spread was obtained by varying target speed on TDC
for each shot. Correct periscope bearing was cranked into
TDC immediately before firing in each case. Second torpedo
(large warhead) hit target amidships 1 minute 11 seconds
after firing first torpedo.

It was intended to fire two torpedoes each at the
first and second ships in column. After having fired at
the first ship, it was seen that the second ship had pre-
viously changed course to the left. The range and gyro
angle for firing at this ship were both too large so did
not fire,

On last look at target before going deep, the target
was stopped on the course on which it had been hit. It had
settled low in the water and was sagging in the middle.
Dense clouds of smoke issued from the deck spaces between
the mainmast and foremst.

-20-

— page 86 —
CONFIDENTIAL
U.S.S. GRAYLING
ATTACK #5
February 13, 1943.
Lat. 14° 13.5'N
Long. 120° 26'E
:
:
:
:
:
: Tube No.
:
7
:
8
:
9
:
:
:
:
:
:
Gyro Angle
:
201°
:
200°
200°
:
:
:
:
:
: Track Angle
111°
i
110°
i
110°
i
:
:
:
:
:Depth Setting
:
O ft.
:
O ft.:
O ft.:
: Target Speed
:
:
:
:
Setting on TDC
:
12.5 kts.:
11 kts: 9.5 kts:
:
:
:
: Enemy course:
315°
:Enemy Speed: 11 kts.(180 RPM)
:
:
:
Firing Range: 1460 yds.: Firing Interval: 7 sec.
:
Attack was made on what appeared to be a small freighter
coming from the vicinity of FORTUNE ISLAND on a northwesterly
course. Sighted ship at 1216 Hypo, bearing 132°T, range 16000
yards, angle on bow 0°. Turned to run with target and ran for
38 minutes checking target course and speed and varying own
course as necessary to stay on target track. At 38 minutes
came right to 045°T for stern shot. Fired 3 torpedoes at
42.5 minutes (1258 Hypo) with data as per above table. Point
of aim stack. Gave left full rudder after completion of
firing. Sound operator followed all 3 torpedoes out and re-
ported that the first two passed ahead and the third astern.
1 minute 49 seconds after firing the first torpedo a depth
charge explosion was heard, followed 10 seconds later by an-
other. Target dropped the first two charges while turning
away and made complete circle, coming back over the firing
point to commence dropping barrages of depth charges. Went
to 240 feet and commenced evasive tactics.
Target appeared to be ordinary small freighter, having a
small gun on the quarter but no other aspects of a patrol
craft. A pile of what seemed to be lumber on the stern
apparently concealed depth charge racks.

-21-

— page 87 —
CONFIDENTIAL
Subject:
U.S.S. GRAYLING
Patrol Report (Fifth War Patrol).

8. ENEMY A/S MEASURES
Anti-submarine patrols were negligible until after torped
attacks had been made. Various types of craft were then en-
countered on patrol. Several 250 ton "catcher" type boats
were used. A converted yacht naintained a continuous patrol
off CORREGIDOR and escorted ships entering and departing fron
Manila Bay. A well armed escort ship accompanied the one con-
voy seen. Single ships proceeded without escort except near
CORREGIDOR. A "Q" Ship was encountered in the Manila Bay Area
the second day after the attack on the convoy there. Patrol
craft worked in pairs at night.

Regular aircraft patrols or aircraft escorts were not evi-
dent. Aircraft were apparently called out and participated in
depth charge attacks initiated by surface craft.

No echo ranging was heard during this patrol. Enemy listen-
ing equipment seemed to be used with skill.

Evasive tactics consisted of running silently at deep sub-
mergence, changing course to keep the attacking ship abaft the
beam. Our nost serious weakness is our inability to get rid of
water without being heard.

9. MAJOR DEFECTS EXPERIENCED
a.
SJ Radar unable to make contacts on land at 3000 yards.
Outside of harbor no contacts obtained on any target dur-
ing patrol.
b. Main Motors - After bearing on No. 3 Main Motor runs hot
above 200 shaft RPM. Went to 184°F when making 250 RPM
necessitating stopping starboard shaft for 20 minutes.
Oil flow temperature and pressure satisfactory at the tine.
c.
D.R.A.I. Stopped at slow speeds. On one occasion upon
diving D.R.A.I. continued at 13 knots.
d. Pitometer Log - Required very frequent blowing out and
venting to keep it registering speed. Even after blow-
ing usually checked at least one knot lower than speed
by navigational plot.
e.
Drain pump would take only very smell suction on After
Room, Maneuvering Room, Engine Roon, and Forward Room
bilges below 160 feet.
f. No means of quietly removing water from bort. On one
occasion every attempt to remove water brought a barrage
of depth charges.

-22-

— page 88 —
CONFIDENTIAL
Subject:
U.S.S. GRAYLING
Patrol Report (Fifth War Patrol).
g. NM-15 out of comission. Head not installed - on tender
being repaired. Their efforts during last refit were
futile.
h. Sea gage sea connection through hull in Forward Room
leaked past nipple crewed into hull. Valve and nipple
were pulled clear and hole plugged. Threads in hull had
apparently corroded away.
i. Transformer in commercial radio receiver set (standby
receiver) burned out. No spares on board.

10. REMARKS
It is urgently recommended that the SJ Radar be replaced
by a set that is in good operating condition. Our SJ was
useless during this patrol and merely added to our silhouette.
The value of this equipment in locating and attacking targets
at night cannot be over-emphasized.
More sickness occurred on this patrol than has heretofore.
The sick list included the following:
Hernia
Catarrhal Fever, Acute
Gonococcus Infection (2)
Cellulitis (2)
Tonsilitis, Acute
Scabies
Diagnosis Undetermined (kidney)
All cases were carefully and intelligently handled by
the Pharmacist's Mate.

— page 89 —
FC5-6/A16-3
Serial No. 072

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

FIRST ENDORSEMENT
GRAYLING ltr. SS209/
A16-3 Serial 01 of
February 24, 1943.

From:
To :
Subject:

SUBMARINE SQUADRON SIX

(6/Mc)
U.S.S. TAITOG, Flagship,
February 28, 1943.

The Commander Submarine Squadron SIX.
The Commander Task Force FIFTY-ONE.
U.S.S. GRAYLING - Fifth War Patrol - Comment on.

1. The GRAYLING's fifth war patrol covered a period of
forty-nine days of which thirty-seven were spent north of the Malay
Barrier. It is of interest to note the large number of contacts with
hospital ships; four were reported in or near the entrance to Manila
Bay and two in TABLAS STRAIT.

2. The performance of the "SJ" radar was disappointing
and its failure to produce results is attributed to inexperience in
adjustment by both tender and operating personnel. The former's
deficiency has now been corrected. Reinstallation of the NM head
(fathometer) will be accomplished if new coils are received prior to
completion of the current refit. A preliminary investigation of #3
main motor bearings did not reveal the cause for the reported excessiv
heating but all indications point to inadequate lubrication. With
the exception of the difficulties encountered with the "SJ" radar,
all defects are considered of minor nature. Operating personnel are
commended on the intelligent and constructive upkeep schedules main-
tained during the entire patrol. The bridge canopy is being altered
in accordance with the SILVERSIDES plan and a 20 MM mount and gun are
being installed in the forward position in addition to the one already
installed on the after section of the bridge deck.

3. There was more than the usual amount of sickness on
this patrol; a number of minor complaints were reported.

4. This was an aggressive well conducted patrol; the
entrances of Manila Bay were patrolled at close range and all assigned
areas thoroughly explored. The percentage of torpedo hits was below
average with four hits out of fourteen shots. Five torpedo attacks
were made of which three were successful.

5. The GRAYLING is congratulated on having inflicted
the following damage on the enemy:

SUNK
1 AK                               3824 tons
1 AK                               4495 tons
1 AK                               6000 tons
1 Schooner                          120 tons
TOTAL                             14439 tons

[SIGNATURE: A. R. McCann]
A. R. McCANN.

— page 90 —
FE24-51/A16-3
Serial 0334
SUBIA INES, SOUTHWEST PACIFIC
U.S.S. TROUT (SS202) FLAGSHIP
C-O-N-F-I-D-E-N-T-I-A-L
SECOND ENDORSEMENT to
CO GRAYLING conf. ltr.
SS209/A16-3 serial Ol
of 24 February 1943.
From:
To :
Via:
Subject:
1.
remarks.
2.
4 0153
Ly
March 4, 1943.
The Commander Task Force FIFTY ONE.
The Commander in Chief, U.S. FLEET.
The Commander Southwest Pacific Force.
U.S.S. GRAYLING
-
-
Fifth War Patrol
Comment on.
Forwarded concurring in the Squadron Commander's
At least four different ships showing hospital ship
markings were sighted during the period 20 to 25 January and pos-
sibly another on February 13. The increasing number of contacts
with this type of ship leads to the suspicion that hospital ship
markings are possibly being used by the enemy to protect certain
valuable ships and cargo. As was done on January 21, periscope
photographs should always be obtained when possible for purposes
of identification and record.
3.
It is noted that the GRAYLING was hampered by an
inoperative fathometer and noisy operation of trim and drain pumps.
Proper maintenance of fathometers is becoming increasingly diffi-
cult due to lack of spare parts and spare heads in this area.
Early delivery of silent type pumps for installation in operating
submarines is a matter of great importance as sound absorption
mountings are not considered to be a satisfactory solution of this
problem.
4.
The Commanding Officer, Officers and Crew are con-
gratulated on the conduct of this patrol. It is considered that
the following damage was inflicted on the enemy:
SUNK
1 AK
3,824 tons
1. AK
4,495 tons
1 AK
6,000 tons
1 schooner
120 tons
Total
14,439 tons
DISTRIBUTION
COMINCH
(2)(Via Comsouwespacfor)
[SIGNATURE: A.R. McCann.]
A.R. MCCANN.
VICE OPNAV
(1)(
17
११
)
1
CINCLANFLT
(1) COMSUBSPAC
(5)
CINCPACFLT
(1) COMSUBSLANT
(2)
COMSOUWESPACFOR(1) COMTASKFOR 42
COMSOUPACFOR (1) COMSUBRON -6
DIV COMS, RON-6(1)
EACH S/M W.A. (1) (NOT TO BE TAKEN TO SEA BURN)
-
(2)
(1)

— page 91 —
[STAMP: Reg. No. [HANDWRITTEN: 2129]
R.S. No. [HANDWRITTEN: 4 0153]]

SOUTHWEST PACIFIC FORCE

A16-3
March 17, 1943.
Serial 0361

C-O-N-F-I-D-E-N-T-I-A-L
THIRD ENDORSEMENT to
C.O. GRAYLING conf. ltr.
SS209/A16-3 serial 01
dated 24 February 1943.

From: The Commander Southwest Pacific Force.
To : The Commander in Chief, U.S. FLEET.

Subject: U.S.S. GRAYLING - Fifth War Patrol - Report on.

1. Forwarded.

[SIGNATURE: J. Carter Jones]
J. CARTER JONES
Chief of Staff
[STAMP (vertical): COMMANDER IN CHIEF
U.S. FLEET
RECEIVED
1943 APR 5]
50

Copy to:
VICE OPNAV
(1)

— page 92 —
[HANDWRITTEN: 1ST COPY]
[HANDWRITTEN: 6 0400]

U.S.S. GRAYLING

Care of Fleet Post Office,
San Francisco, California,
April 25, 1943.

SS209/A16-3

Serial ( 05 )
[STAMP: DECLASSIFIED][HANDWRITTEN: I-A-L]

From: The Commanding Officer.
To : The Commander-in-Chief, U.S. Fleet.

Via : Oficial Channels.

Subject: Patrol Report (Sixth War Patrol).

Enclosure: [HANDWRITTEN: ✓](A) Patrol Report, Period March 18,
           1943 to April 25, 1943.

1. Enclosure (A) is forwarded herewith.

[SIGNATURE: J.E. Lee]
J.E. LEE.

DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
BY [HANDWRITTEN: OP-089C] DATE [HANDWRITTEN: 5/26/12]
[STAMP: DECLASSIFIED]

[HANDWRITTEN: 50372]

— page 93 —
CONFIDENTIAL                               U.S.S. GRAYLING                               6 0400

U.S.S. GRAYLING - Sixth War Patrol.

PERIOD - March 18, 1943 to April 25, 1943.

OPERATION ORDER 8-43.

GRAYLING arrived in Fremantle February 24, 1943
from Fifth War Patrol. Refit by U.S.S. PELIAS.
Readiness for sea March 18, 1943. On March 17,
1943 made practice approaches on HIMS VAN GALEN.

Patrol instructions directed GRAYLING to proceed
via LOMBOK and MAKASSAR STRAITS to TARAKAN and
patrol there for a period of about 5 days. Thence
to eastern approaches of VERDE ISLAND PASSAGE and
patrol there about 6 days. Thence proceed to vi-
cinity of Manila. Start return at dark 28 April
1943.

1. NARRATIVE

March 18
1430(I) Underway from Fremantle. Conducted day and night practice
        approaches with U.S.S. ISABEL as target.

March 19
0020    Training exercises completed. Departed from exercise area.
1536    Made training dive. Exercised at all drills.
1637    Surfaced.
        NOON LAT. 29-53-15 S; LONG. 113-39-00 E.
        Distance run 241.0. Fuel expended 2311.

March 20
0900    Held drills made training dive.
1145    Ballo surface. Fired 3 rounds from 3 in. gun.
        NOON LAT. 24-53-00 S; LONG. 112-16-00 E.
        Distance run 285.5 miles. Fuel expended 3537.

March 21
0707(H) Entered Exmouth Gulf.
0918    Moored alongside oil barge.
1030    Two officer passengers disembarked, (Commander F.T. Bell, U.S.N.,
        Lieutenant J.G. Quesada, U.S.N.).
        Transferred one baker third class to Advance Base for treatment.
        Replacement not received.
1232    Departed from oil barge. Received 8736 gallons of fuel oil.
        NOON Exmouth Gulf.
        Distance run 280.1 miles. Fuel expended 2833.

March 22
0900    Held drills. Made training dive.

                                - 1 -

— page 99 —
U.S.S. GRAYLING
CONFIDENTIAL                                                              6 0400

Subject:        U.S.S. GRAYLING - Report of Sixth War Patrol.

— page 100 —
CONFIDENTIAL
Subject:
U.S.S. GRAYLING
U.S.S. GRAYLING - Report of Sixth War Patrol."'
April 12
0458
Submerged.
0549
Sighted small patrol boat standing towards CORREGIDOR from Southwest.
It passed about 3000 yards to West of GRAYLING.
0735
Sighted freighter standing towards CORREGIDOR from Southwest.
Commenced approach at high speed in order to close target track
for a stern tube shot. Target was zigzagging continuously, ap-
parently using constant helm,
0821
Fired 3 torpedoes. No hits.."
0822
Observed target turning towards us.
0823
Fired remaining torpedo as target closed in.
0824
Heard numerous small explosions, probably gun fire.
0827
2 explosions.
0828
1 explosion.
1420
Commenced clearing arca; all torpedo es expended.
Heard echo ranging and sighted masts of destroyer in vicinity of
morning attack.
1849
Surfaced.
2220
Commenced attempt to transmit mossage to Radio Perth telling of re-
'sults and departure fron area.
For the next 2 hours unsuccessful attempts were made to get this
message off. Sent it blind twice.
NOON LAT. 14-09-20 N; LONG. 120-01-10 E..
Distance run 93.0 miles. Fuel expended. 379.
April 13
0546
Submerged.
1831
Surfaced.
1915
Sighted ship bearing 182°T on easterly course. Commenced tracking
while closing range. Identified ship as small 2 dock passenger -
freighter.
2024
Range 2800 yards fired 4 rounds from 3" gun. Trainer had diffi-
culty seeing the target, all shots missed. Target slowed and a
small boat was seen to shove off. shortly thereafter. Closed range
to 1600 yards and commenced firing with both 20 III guns and the 3"
gun. Continued firing all guns while closing range to 500 yards and
less. 20 MI fire was very accurate and about 600 hits were made
with these weapons. "The 3" gun fire was less accurate but obtained
about 20 hits out of 57 rounds fired..."
2052
With smoke and stean issuin; from the target and a good fire burning
inside, ceased firing and commenced clearing the area. Target was
observed to burn until 2130 at which time a flare-up occurred and
2245
the fire was seen no more. Believe target sank at this time.
Transmitted message which we had been unable to get off last night.
NOON LAT. 11-15-45 N; LONG. 121-17-00 E.
Distance run 204.4 miles. Fuel expended 2555.
April 14
0540
Submerged.
1530
Surfaced.
NOON LAT. 8-26-00 N; LONG. 120-17-45 Ε.
Distance run 208.5 miles. Fuel expended 2510.

-8-

— page 101 —
U.S.S. GRAYLING
6 0400
CONFIDENTIAL
Subject:
U.S.S. GRAYLING - Report of Sixth War Patrol.
April 15
0118
Sighted Pearl Bank.
0522
Sighted Bungo Island.
0536
Submerged and entered SIBUTU PASSAGE.
1711
Surfaced.
1715
Sighted plane; made quick dive. No radar indication.
1825
Surfaced.
NOON LAT. 4-44-45 N; LONG. 119-39-30 E.
Distance run 235.6 miles. Fuel expended 3066.
April 16
0506
Sighted North Coast of Celebes.
0927
Sighted North Watcher Island bearing 163°T, distance 23 miles.
1254
SD radar failed completely, submerged because of cloud conditions.
1828
Surfaced.
NOON LAT. 00-36-00 N; LONG. 119-31-45 E.
Distance run 260.8 miles. Fuel expended 3634.
April 17
0616
Submerged. SD radar still out of commission.
1834
Surfaced.
NOON LAT. 2-37-00 S; LONG. 118-20-30 E.
Distance run 220.2 miles. Fuel expended 2766.
April 18
0624
Submerged.
1820
Surfaced.
1822
Sighted 2 masted schooner on northerly course.
1853
Opened fire on schooner.
1905
Schooner sank.
2142
Sighted dark object dead ahead. Investigated and found it to be a
small sail boat.
2245
Sighted another small sail boat.
NOON LAT. 5-50-10 S; LONG. 116-52-45 E.
Distance run 219.2 miles. Fuel expended 2841.
April 19
0330
Entered LOMBOK STRAIT. Sighted several small sail boats in the Strait
0540
Submerged.
1834
Surfaced.
NOON LAT. 9-03-50 S; LONG. 115-43-50 E.
Distance run 212.5 miles. Fuel expended 2903.
April 20
1034
Sighted plane; made quick dive. SD radar still out of commission.
Went to 200 feet and tested trim and drain pumps.
1233
Surfaced.
NOON LAT. 12-37-00 S; LONG. 115-09-00 E.
Distance run 228.5. Fuel expended 2733.
April 21 Proceeding on the surface.

-9-

— page 104 —
CONFIDENTIAL
U.S.S. GRAYLING

5. DESCRIPTION OF ENEMY WARSHIPS OR MERCHANT SHIPS SIGHTED:

| Date    | Position      | Initial Range | Course and | Est. Length | Description

— page 105 —
U.S.S. GRAYLING
6 0400
CONFIDENTIAL
March 28, 1943
7. DETAILS OF ATTACKS
ATTACK #1

. LATITUDE 3°04'00" N. LONGITUDE 118°05'00" E.
: : : : :
:Tube No. : 1 : 2 : 3 : 4 :
: : : : : :
:Gyro Angle : 1°L : 4°R : 1°L : 6.5°R :
: : : : : :
:Track Angle : 110°S : 115°S : 110°S : 117.5°S :
: : : : : :
:Depth Setting : 4 ft. : 6 ft. : 4 ft. : 6 ft. :
:Target Speed : : : : :
:Set on TDC : 14 kts. : 16 kts. : 12 kts. : 15 kts. :
: : : : 14 kts. Turn count 232 RPM :
:Enemy Course: 145° :Enemy Speed: (believe this was a "double" :
: : : : count) :
: : : : :
:Firing Range: 3000 yds :Firing Interval: 12 sec. :
: : : : :

At 0948 (HOW) while conducting submerged patrol off TARAKAN on course
358°T, weather rainy, sea smooth, a tanker of the NIPPON MARU class,10000
tons, was sighted, range about 6000 yards, angle on bow 45°S. Came right
to normal approach course at 6.5 knots. At 0957 slowed and after an ob-
servation, changed course to 075°T. Sound range of 3100 yards checked
closely with TDC range.

At 1001 commenced firing 4 torpedoes using NOT as point of aim. Ob-
tained spread by using different target speed in TDC for each shot.
Introduced correct periscope bearing into TDC before each shot. Sound
followed torpedoes and reported them running normally and on proper
tracks. Swung hard right at 90 feet to avoid expected aircraft attack.
The torpedo tracks were very conspicuous in the glassy sea.

A torpedo explosion was heard at 1003, two minutes and 5 seconds
after firing the first torpedo. After the first explosion, sound re-
ported "different" propellors on the bearing of the target. Rumbling
and crackling sounds were heard at this time, and these continued for
about 5 minutes. At 1006-30 and 1007-30 two more explosions were heard.
It is believed these were end-of-run explosions. At 1009-30 sound re-
ported propellors definitely stopped. At 1035 periscope observation -
target was not in sight. Visibility in direction of target was good.

- 13 -

— page 106 —
CONFIDENTIAL                                        U.S.S. GRAYLING                                 April 7, 1943

                                                    ATTACK #2

LATITUDE 13° 20'15" N.                              LONGITUDE 121°33'15" E.
:
:Tube No.                : 1             : 2             : 3             : 7
:
:Gyro Angle              : 15°L          : 12.5°L        : 14°L          : 3°R
:
:Track Angle             : 82°P          : 82.5°P        : 84°P          : 119°P
:
:Depth Setting           : 0             : 0             : 0             : 0
:
:Target Speed            : 12 kts.       : 10 kts.       : 9 kts.        : 8 kts.
:Set on TDC
:
:Enemy Course: 303 & 266                 : Enemy Speed:                  : 10 & 8 kts.
:
:Firing Range: 1200 & 1500               : Firing Interval:              : 10 sec, 8 sec,
:                                                                       : 4 min. 10 sec.

While patrolling approaches to VERDE ISLAND PASSAGE on course 150°T,
sighted smoke bearing 111°T at 0125 (HOW). At 0126 the SJ Radar picked
up the target (a 7000 ton freighter) bearing 109°T, range 9000 yards.
Plot obtained target course of 308°T, speed 10 knots. GRAYLING maneu-
vered to keep bow pointed at target. At 0142-30 commenced firing three
torpedoes with data as per above table. Spread was obtained by varying
target speed on TDC for each shot. Correct TBT bearing was introduced
into TDC before each shot. The first torpedo took an excessive left
angle, finally straightening out about 100° to the left of its proper
course. The tracks of the other two torpedoes were observed to be run-
ning true on a collision course with target. At 0145-30 heard and felt
a violent explosion. Expected to see target break up but didn't. Tar-
get slowed and commenced turn to left. GRAYLING turned right for a
stern tube shot. At 0149 fired one torpedo from stern tube. This tor-
pedo ran straight for the target and the after lookout reported a flash
when it reached the target. No explosion. Target opened fire with gun
mounted on forecastle. Submerged to 40 feet and when periscope com-
menced decreasing depth deeper. Targets screws were heard aft by sound
operator. At 0205, depth 40 feet, could not pick up target on SJ. Sur-
faced at 0220. Nothing in sight. Radar contact bearing 310°T, range
9500 yards. This contact faded out almost immediately. Two more dis-
tant explosions were heard at same time radar contact faded. Came to
course 310°T. Went ahead on four main engines to investigate spot where
radar contact had been.

- 14 -

— page 107 —
CONFIDENTIAL
U.S.S. GRAYLING
6 0400
ATTACK #3 (Sequel to Attack #2)
April 7, 1943.
LATITUDE 13°30'30" N. LONGITUDE 121°23'30" E.
At 0244 obtained radar contact bearing 308°T range 9580 yards.
Sighted the target immediately thereafter and commenced a stern chase.
At 0308 observed target zig to right. At 0310 target zigged left.
Target was now about to enter VERDE ISLAND PASSAGE, so at 0315
with target bearing 312°T made preparation for a shot at target's stern,
range to target 2900 yards. At 0319-20 fired one torpedo, track angle 174°
port, gyro angle 2° left, depth setting 0 feet. Estimated target speed 9
knots, range 2600 yards. The target commenced turning left after this
torpedo was fired. Torpedo track seemed to heading straight for the tar-
get but there was no explosion when it arrived.
At 0320-45 with GRAYLING on course 298°T, range 2400 yards, fired
one more torpedo with 7° left gyro angle, track angle 129°port. Estimate
target speed 9 knots, estimated course 240°T. A loud explosion was heard
at 0323-40. At 0324-40 another dull explosion was heard. Target appeared
to have stopped.
At about 0326 the target commenced firing from guns in the bow and
stern (his flashless powder was very flashless). Having fired six tor-
pedoes for two hits in this target and believing we were well within the
range of shore batteries covering VERDE ISLAND PASSAGE, reversed course
and retired to the east.

ATTACK #4
April 7, 1943

Patrolling on surface in TABLAS STRAIT, south of MARINDUQUE ISLAND,
LATITUDE 13-08-30 N; LONGITUDE 122-10-30 E, on course 113°T. SJ radar
contact at 2150 (HOW) bearing 018°T, range 6400 yards. Came left and
worked up to a position ahead of the target while plot was obtaining a
solution of course and speed. At 2311 with a range of 1940 yards made
quick dive to 40 feet and turned to 202°T for a stern shot with 90°
Port track. At 2315 fired one torpedo at a range of 1600 yards, Gyro
angle 3°L, Track angle 93°P. Target course 292°T, speed 8 knots, depth
setting 0 feet, torpedo run 1500 yards. The TDC solution had been check-
ing with radar ranges and TBT bearings and a bearing check was obtained
by periscope just prior to firing. Sound followed torpedo out and reported
it running normally. After waiting well past torpedo running time to tar-
get with no explosion, decided to surface and use guns. At 2322 surfaced.
After surfacing, plot determined that target was still on the same course
and at the same speed as before.

At 2355 with range to target 1000 yards, opened fire with all guns.
The target changed course to the right and headed for the south shore of
MARINDUQUE. After the fourth round was fired from the 3" gun a projectile
jammed in the barrel. No hits were obtained with the 3" gun.
Several bursts of 20 MM fire hit the target forward and amidships.
A strong odor of tar came from the target.
About 0010 a gun on the beach commenced firing, and, as the target
now appeared to have run aground, the GRAYLING departed.

- 15 -

— page 108 —
CONFIDENTIAL
U.S.S. GRAYLING
ATTACK #5
April 9, 1943
LATITUDE 13°11′30″ N LONGITUDE 121°45'05" E

|: Tube No. |: 1 |: 3 |: 4 |: 5 |: 6 |
|: Gyro Angle |: 20°L |: 26°L |: 22.5°L |: 41.5°R |: 43°R |
|: Track Angle |: 97°P |: 103°P |: 99.5°P |: 64.5°P |: 62°P |
|: Depth Setting |: 0 |: 0 |: 0 |: 0 |: 0 |
|: Spread |: 0 |: 3°L |: 3°R |: 2° L |: 2°R |
|: (Offset) | | | | | |
|: Enemy Course: 298° - 328° |: Enemy Speed: 8 knots |
|: Firing Range: 900 yards |: Firing Interval: 9, 8, 36, 7 sec. |

At 0529 (HOW) while on course 105°T, sighted west bound convoy bear-
ing 094°T. Came left to 030° and commenced approach, range about 17000
yards. Convoy was zigzagging frequently. One DD escort was ahead of
the starboard column. One engines-aft escort vessel was on the port
beam of the convoy. Closed estimated mean track making observations
about every 3 minutes and making standard speed between looks.
At 0604 came left torcourse, 010°. At 0614 came right to course:
040, to come in with a 70°,port track, range mw4800 yards. Commenced
firing at 0628 15 (HOW). Fired three torpedoes at leader of port col-
umn and two a next astern. Data as per table above. At 0628-52 ex-
plosion, hit, At 0629-14 explosion, hit! At 0630-18 explosion, nit!
First target received two hits and was settling rapidly when seen at
0631. Second target received one hit which broke her back although
she stayed afloat until late afternoon, when attempted salvage oper-
ations hastened her sinking. At 0631 went deep and commenced evasive
tactics. Iepth charging by escorts commenced at 0633.

- 16 -

— page 109 —
6 0400

CONFIDENTIAL
U.S.S. GRAYLING
ATTACK #6
April 12, 1943

LATITUDE 14°14'00" N                                  LONGITUDE 120° 14' 00" E
:Tube No.                         :   7   :   8   :   9   :   10  :Gyro Angle                        :  7°R  :  4°R  :  6°R  :  8°R  :Track Angle                       :  81°P :  84°P :  82°P :  21°P :Depth Setting:                    :   4   :   0   :   4   :   0   :Spread (Offset)                   :   0   :  4°L  :  4°R  :   0   :Enemy Course: 061°, 002°          : Enemy Speed:                  13 knots        :Firing Range: 980 yards           : Firing Interval: 9, 8, 64     :

While conducting submerged patrol off MANILA BAY, P.I., on course
061°T, sighted 7000 ton freighter at 0735 (HOW) bearing 262°T. Came
left to normal approach course at high speed to close track for stern
tube shot (no torpedoes forward). Observations indicated that the
target was zigzagging continuously between 040° and 090°. Mean course
about 065°. At 0817 came left to 333° and commenced firing at 0820-47.
Fired three torpedoes with data as per above table. Sound heard torpedoes
running normally on proper courses. Waited until torpedo running time
to target had elapsed then took another look at the target, which had
turned toward. Obtained a new setup for TDC and at 0822-12 fired one
torpedo (#10 tube) with data as per table. Came left and went deep.
Three loud explosions were heard at 0826-25, 0826-47, and 0827-45.
Numerous minor explosions were also heard. No damage to target or
GRAYLING.

- 17 -

— page 110 —
U.S.S. GRAYLING

CONFIDENTIAL
Subject: U.S.S. GRAYLING - Report of Sixth War Patrol.

8. ENEMY A/S MEASURES:
   Fewer surface patrols were seen than on the previous patrol in this
   area. Aircraft patrols seem to be slightly increased.
   The anti-aircraft escort vessel encountered apparently used small
   depth charges for range finding. They didn't seem to be very effective.
   This ship did not use echo ranging.
   The destroyer used echo ranging in searching an area where the sub-
   marine was known or suspected to be. It did not echo range prior to
   our attack. The destroyer's depth charges seemed more powerful than
   those previously heard.
   The freighter that was unsuccessfully attacked off Manila Bay may have
   had some small bombs or charges. Several "swishing" noises were heard
   after it passed overhead. One sharp explosion, as if from a small charge,
   was heard very close aboard. No damage.

9. MAJOR DEFECTS EXPERIENCED:

   (a) SJ Radar. Motor generator failed to maintain proper voltage.
       A 65 volt ground found in shunt field. Voltage varied with
       state of battery charge and finally motor generator would cut
       out after starting. Operated SJ by obtaining power from I.C.
       board. Arrangement made so either SJ Motor Generator or I.C.
       Power could be used.

   (b) SD Radar. Operation erratic, to complete failure. On the last
       patrol the SD operation was excellent but during refit our receiver
       was replaced by one from the THRESHER and it has not been satis-
       factory since its installation in GRAYLING.

   (c) Negative tank flood valve twice failed to open at or below peris-
       cope depth when the need for opening it was urgent. This failure
       was also experienced on the last two patrols.

   (d) All main engine exhaust valves leak excessively when submerged
       necessitating closing the exhaust nozzle drains to prevent bilges
       flooding. This procedure puts engine temporarily out of commission
       until it is certain no water entered the engine.

   (e) On one occasion on diving the outboard exhaust valve on No. 4 main
       engine stuck halfway between the open and closed position permitting
       the engine and bilges to be flooded.

   (f) D.R.A.L. - Performance is erratic. The calibration is apparently
       not correct. The machine at high speeds is fast and at low speeds
       is slow.

   (g) JK-QC Sound Gear - In training this gear there is excessive
       noise. Noise seems to be produced by binding of shaft and is
       of such intensity as to give away location of vessel during
       evasive tactics.

- 18 -

— page 111 —
CONFIDENTIAL
U.S.S. GRAYLING
Subject: U.S.S. GRAYLING - Report of Sixth War Patrol.
6 0400
(h) This was the third consecutive patrol without the use of the fathom-
eter. Necessary repairs were not made during the refit because of
lack of material.

10. REMARKS:

On the night of April 12, after the tuning of the transmitter
had been carefully checked, an attempt was made to transmit "GRAYLING
ONE". Radio Perth gave us "Signal Strength 4-5 your frequency is
high". Two hours were spent in unsuccessful attempts to get this
message off. It appeared that with a slight adjustment of the re-
ceiver this message should have been received.
The following night the message was transmitted without diffi-
culty although the transmitter settings were the same.
The SJ radar was used with gratifying results in all night con-
tacts.
The failure of the SD radar forced us to do more submerged
running than otherwise would have been necessary.
Off CALAPAN POINT, MINDORO a 3° temperature drop was experienced
between depths of 64 feet and 90 feet.
The following photographs were taken:

6 April - Inter-island steamer.
9 April - Sinking ship (3 exposures)
9 April - Destroyer

- 19 -

— page 112 —
FC5-6/A16-3
Serial No. 0146
C-O-N-F-I-D-E-N-T-I-A-L
SUBMARINE SQUADRON SIX
(6/Mc)
U.S.S. TAUTOG, Flagship,
April 27, 1943.

FIRST ENDORSEMENT to
CO GRAYLING Conf. ltr.
SS209/A16-3 Serial 05
of April 25, 1943.

From: The Commander Submarine Squadron SIX.
To : The Commander-in-Chief, U.S. Fleet.
Via : (1) The Commander Task Force SEVENTY-ONE.
(2) The Commander SEVENTH FLEET.

Subject: U.S.S. GRAYLING - Sixth War Patrol - Comment on.

1. The sixth war patrol of the U.S.S. GRAYLING
covered a period of thirty-nine days, twenty-seven of which were
spent north of the Malay Barrier. The patrol was terminated
early when all torpedoes were expended.

2. The GRAYLING returned from patrol in a generally
excellent material condition and is currently being refitted by
the Submarine Repair Unit assisted by the SRUS in preparation fo.
the seventh war patrol. It is not anticipated that repairs will
require extension of the normal refit period. The GRAYLING is
being given a routine docking during current refit at which time
the cause of negative flood valve failure will be investigated
and remedied. Material to repair GRAYLING'S fathometer is now
at hand.

3. The health of the crew was, in general, normal.
TWO cases of excessive loss of weight, with other symptoms, are
possible indications of nervous strain. Lieutenant Wadsworth
had his left ear affected by gun blast but this is not expected
to be serious. There were two complaints of eye trouble. The
Squadron Medical Officer believes that the officers used multi-
vitamin capsules regularly and benefited thereby but the men
should be given greater encouragement to take these capsules.

4. This patrol was aggressively conducted and the
patrol areas thoroughly covered. It is worthy of note that all
but one of the possible torpedo targets sighted was attacked. I
indicates the determination of the Commanding Officer to get int
an attack position and cause loss to the enemy. Gunfire with 3
inch and 20 MM guns was used to great advantage. Use of the SJ
radar was very effective. Although the tanker hit on 28 March
was not observed to sink, the evidence that this did occur is
very strong. Two minutes and five seconds after firing a spread
of 4 torpedoes at a range of 3000 yards a torpedo explosion was
heard. Sound reported "different" propeller sounds on the bear-
ing of the target, probably indicating an attempt to speed up.
The usual breaking up noises of a ship were heard for about 5
minutes. Then two probable torpedo end-of-run explosions were
heard followed by propeller sounds definitely stopping. A good
observation was made by periscope 32 minutes after firing and the
target was not in sight. The Squadron Commander considers that
- 1 -

— page 113 —
FC5-6/A16-3
Serial No. 0146
C-O-N-F-I-D-E-N-T-I-A-L
FIRST ENDORSEMENT to
CO GRAYLING Conf. ltr.
SS209/A16-3 Serial 05
of April 25, 1943.
Subject:
SUBMARINE SQUADRON SIX (6/Mc)
U.S.S. TAUTOG, Flagship,
April 27, 1943.
U.S.S. GRAYLING - Sixth War Patrol - Comment on.
the ship sank. Although two hits were obtained on the early morning
attack of 7 April, the evidence is insufficient to credit a sinking.
The Commanding Officer has furnished further information in regard
to ships attacked where insufficient identification appears in the
report. Attack #5 on 9 April was made on a ship resembling the
ATLANTIC MARU (5873 tons) and one resembling the BORDEAUX MARU (6567
tons) in that order. The small steamer sunk by gunfire on 13 April
is described as similar to the S.S. MAYON, about 2000 tons. The
sailboat sunk 25 March was of about 30 tons.

5. Except for one torpedo which took a 100° left angle
the torpedo performance was good. There is good evidence that the
exploder performance was not good. The maximum depth settings where
exploders failed was 6 feet. These torpedoes and exploders had not
the latest modifications. It is hoped that performance will be im-
proved as a result of the latest alterations.

6. It is noted that hospital ship traffic has not abateć
in the Phillippine area.

7. The Commander Submarine Squadron SIX congratulates
the Commending Officer, officers and crew on a very successful patrol
The GRAYLING is credited with having inflicted the following damage
on the enemy:

SUNK
1 AO (NIPPON MARU class) 9974 tons
1 AK (ATLANTIC MARU class) 5873 tons
1 AK (BORDEAUX MARU class) 6567 tons
1 AK (similar to S.S. MAYON (by gunfire) 2000 tons
1 Schooner (by gunfire) 120 tons
1 Large Sailboat (by gunfire) 30 tons
TOTAL 24564 tons

DAMAGED
1 AK (LONDON MARU class) 7191 tons
1 AK (Unidentified) (by gunfire) 1500 tons
TOTAL 8691 tons
[SIGNATURE: A. R. McCann.]
A. R. MCCANN.

— page 114 —
FE24-71/A15-3
Serial 0451
C-O-N-F-I-D-E-N-T-I-A-L
SECOND ENDORSEMENT to
CO GRAYLING Conf. ltr.
SS209/A16-3 Serial 05
of April 25, 1943.
From:
To:
Via:
Subject:
1.
"U.S. NAVAL FORCES
WESTERN AUSTRALIA
May 3, 1943.
The Comnander Task Force SEVENTY-ONE.
The Commander in Chief, U.S. FLEET.
The Commander SEVENTH FLEET.
U.S.S. GRAYLING
-
roth
6 0400
Sixth War Patrol - Comment on.
The Sixth War Patrol of the GRAYLING was terminated
14 days early due to expenditure of all (20) torpedoes. That the
aggressive fighting spirit exhibited by the GRAYLING after firing
all torpedoes was not allowed to lapse on the way home was demon-
strated by the attacking and sinking of a 2,000 ton passenger
freighter and a two-masted 120 ton schooner, both by gun fire.
2.
All but one contact with possible torpedo targets
resulted in attacks on the enemy and this one was broken off by
plane contact on radar during a day surface chase.
3.
The Task Force Commander considers the evidence of
sinking of the NIPPON MARU Class Tanker attacked on 23 March in-
sufficiently conclusive and for that reason the GRAYLING is being
credited with only damaging this ship.
4.
The Commanding Officer, officers and crew of the
GRAYLING are congratulated on the completion of an aggressively
conducted highly successful patrol, and on inflicting the follow-
ing damage on the enemy:

SUNK
1 AK (Atlantic MARU Class)
5,873 tons
1 AK (Bordeaux MARU Class)
6,567 tons
1 AK (Similar to S.S. HAYON-
(by gun fire
2,000 tons
1 Schooner (by gun fire)
120 tons
1 Large Sailboat (by gun fire)
30 tons
TOTAL SUNK......
-
1-
14,590 tons

— page 115 —
FE24-71/A16-3
Serial 0451
C-O-N-F-I-D-E-N-T-I-A-L
Subject: U.S.S. GRAYLING - Sixth War Patrol - Comment on.

(4. Cont'd)

DAMAGED
1 AO (NIPPON MARU Class) 9,974 tons
1 AK (LONDON MARU Class) 7,191 tons
1 AK (Unidentified)(by gun fire) 1,500 tons
TOTAL DAMAGED.. 18,665 tons

R. W. CHRISTIE.

DISTRIBUTION
COMINCH (2)(Via COM 7TH FLEET)
VICE OPNAV (1)(Via COM 7TH FLEET)
COM 1ST FLEET (1)
COM 2ND FLEET (1)
COM 3RD FLEET (1)
COM 7TH FLEET (1)
COMSUBS 1ST FLEET (5)
COMSUBS 2ND FLEET (2)
COMTASKFOR 72 (2)
COMSUBRON-6 (1)
DIV COMS, RON-6 (1)
EACH S/M W.A. (1)(NOT TO BE TAKEN TO SEA - BURN)

[SIGNATURE: B. L. Carr]
B. L. CARR,
Lieutenant Commander, U.S.N.,
Flag Secretary.

- 2 -

[STAMP: (C)]
U.S. NAVAL FORCES
WESTERN AUSTRALIA
roth
May 3, 1943.

— page 116 —
UNITED STATES FLEET
COMMANDER SEVENTH FLEET
A16-3
Serial 0850
CONFIDENTIAL
CONFIDENTIAL
THIRD ENDORSEMENT to
CO GRAYLING Conf. ltr.
SS209/A16-3 Serial 05
dated April 25, 1943.
From: The Commander SEVENTH FLEET.
To : The Commander-in-Chief, U.S. FLEET.
Subject: U.S.S. GRAYLING - Sixth War Patrol - Report on.
1. Forwarded.
wgj
[STAMP: Reg, No. 3693 (14459)...
R.S. No. 6 0400]
22 MAY 1943
[SIGNATURE: J. Cary Jones]
J. CARY JONES,
Chief of Staff.
Copy to: Vice OPNAV.
[STAMP: COMMANDER IN CHIEF
U. S. FLEET
RECEIVED
1943 JUN 5 20 30]

— page 117 —
SS209/A16-3
Serial (014)
DECLASSIFIED-L
From:
To :
Via:
Subject:
Enclosure:

1.
U.S.S. CR YLING
Care of Fleet Post Office,
San Francisco, California,
July 6, 1943
The Commanding Officer.
The Commander-in-Chief, U.S. Fleet.
Official Channels.
Patrol Report (Seventh War Patrol).
(A) Patrol Report, Period May 18, 1943
to July 6, 1943.
Enclosure (A) is forwarded herewith.

[SIGNATURE: J.E. Lee]
J.E. LEE.
DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
BY OP-09R9C DATE 5/26/72
DECLASSIFIED

52487
1ST COPY

— page 118 —
CONFIDENTIAL

U.S.S. GRAYLING
U.S.S.GRAYLING - Report of Seventh War Patrol.
PERIOD - May 18, 1943 to July 6, 1943.
OPERATION ORDER - 15-43.

GRAYLI arrived in Fremantle April 25, 19.
from Sixth War Patrol. Received routine dee
ing. Refit by the U.S.S. OTUS and the Sub-
marine Repair Unit. Readiness for sea date
May 18, 1943. On May 15, 1943 conducted prac-
tice approaches with and made sound runs for
H.N.M.S. HEEMSKERCK. May 16, 1943 conducted
sound exercises and practice approaches with
H.M.A.S. HORSHAM.

Patrol instructions directed GRAYLING to pro-
ceed to vicinity of SOEBI KETJIL ISLAND via
LOMBOK STRAIT, MAKASSAR STRAIT, SIBUTU PASSAGE,
BALABAC STRAIT and Northwest coast of BORNEO.
After about six days in vicinity of SOLBI KOTJIL,
to proceed to the vicinity of ANAMBA ISLANDS
and exploit the trade lanes there and those in
the vicinity of PULO TENGGOL LIGHT. Start re-
turn via likely traffic lanes at dark June 24,
1943.

1. NARRATIVE.

May 18
1100 Underway from Fremantle.
Made sound runs for H.M.N.S. HEMSKERCK, followed by practice approaches
H.M.N.3. HEMSKERCK and H.M.N.S. TROMP.
2055 Departed from exercise area.
HOON: Enroute exercise area.'
Distance run 10 miles. Fuel expended 137.

May 19
0900 Exercised at all' drills. Made training dive.
1545 Sighted PBY on northeasterly course.
NOON L..TITUDE 29°13'S; LONGITUDE 113°14'E.
Distance run 248.7 miles. Fuel expended 2859.

May 20
0930 Exercised at all drills. Fired 3 in. gun.
1330 Fired 20 mm. cuns..
1400 Made training dive, followed by emergency drills.
NOON LATITUDE 24°09'30"S; LONGITUDE 112°38'15"E.
Distance run 319.6 miles. Fuel expended 3236.

May 21
0155 Sighted NORTHLIST CAPE bearing 120°T, distance 25 miles.

- 1-

— page 120 —
CONFIDENTIAL
Subject:
U.S.S. GRAYLING

U.S.S. GRAYLING report of Seventh War Patrol.
made several large changes of course away from GRAYLING.
Range to target now 16000 yards; lost radar contact.
Continued to eastward along the path the target was believed to have
taken.
NOON LATITUDE 6°51'S; LONGITUDE 116° 22'E.
Distance run 206.9 miles. Fuel expended 2477.
ay 26
0610
Sighted plane to north. Submerged.
Sighted several sail boats during the day.
1742
Sighted smoke bearing 253°T. Went to battle stations and commenced
approach.
1757
Sunset.
1839
Fired 3 torpedoes. (Attack #2)
1841
Heard and felt a series of about 6 explosions.
1923
Heard last explosion. Sound lost contact with target.
Searched with SJ Radar from a depth of 40 feet; no contact.
1938
Surfaced. Was unable to locate target by sight or by radar.
Proceeded in direction target was last seen. Passed several small
boats close aboard during the night.
NOON LATITUDE 6°09'00"S; LONGITUDE 118°25'00"E.
Distance run 186.4 miles. Fuel expended 2223.

May 27
0547
Submerged.
1825
Encountered numerous sail boats during the day.
Surfaced.
NOON LATITUDE 4°20'00"S; LONGITUDE 118°42'00"E.
Distance run 144.0 miles. Fuel expended 835.

May 28
0930
Gyro compass out of commission. Commenced steering by magnetic compass.
This was the first day we were able to remain on the surface since leav-
ing EXOUTH GULF.
1517
Passed TG MANGKALIHAT abeam.
NOON LATITUDE 0°17'N; LONGITUDE 119°03'E.
Distance run 270.3 miles. Fuel expended 2871.

Lay 29
0000
Commenced steering by gyro compass.
0358
Gyro compass out of commission. Commenced steering by magnetic compass.
0431
Entered SIBUTU PASSAGE.
0500
Submerged.
1840
Surfaced and headed for BALABAC STRAIT.
2300
Attempted to use fathometer and found that it was flooded to the junc-
tion box.
NOON LATITUDE 4°51'N; LONGITUDE 119°39'E.
Distance run '276.3 miles. Fuel expended.3149.

May 30
0050
Received second dispatch asking for details of plane contact on the 21st
0103
Headed east in preparation for sending a message.
[HANDWRITTEN: #7]
0230
Sent message giving details of plane contact, reporting attacks made,
and materiel difficulties being experienced. Reversed course after
message was cleared. Total time transmitter was in operation - 14
-3-

— page 125 —
U.S.S. GR. YLING
CONFIDE TIAL
Subject:
U.S.S. GRATING - Report of Seventh War Patrol.
HOON LATITUD 4°42'N; LONGITUDE 103°39′E.
Distance run 145.0 niles. Fuel expended 846.
June 20
0512
1858
Subnerged south of PULO TENGGOL.
Sighted a series of 5 sail boats proceeding south close to the shor
during the day.
Surfaced.
HOON LATITUDE LLO'N; LONGITUDE 103°40'.
Distance run 92.4 milos. Fuel expended 323.
Submerged and patrolled between PULO THUOCOL LIGHT and TNJUNG DUNGUN.
Surfaced and proceeded towards the reported location to US PRICE OF
June 21
0509
1852
WALES and REPULSE.
NOON L TITU 4°45'11; LONGITUDE 103°36'.
Distance rin 93.9 milos. Fuel expendud 375.
June 22
0130-0200 In vicinity of reported position of PRINCE OF HALES and RUPULSE. Hoth-
ing sighted in bright moonlight.
0215
Sighted soke bonring 17.5°T.
0221
Saw there were 3 shios proceeding on northerly course. Haintained
visual contact chead of target formation.
0531
Submerged....
0548
Sighted tarrots in periscope. Corrienced approach.
0630
Fired 3 torpedoes. (ATTACK #5)
0632
Observed one hit on a tanker.
0636
Hoard one end-of-run explosion.
0639
Explosion similar to that above.
645
Saw target down by the bow but still making about 5 knots.
0650
Heavy rain squall; could not see target.
0725
Saw 2 shins bearing 052°T, distance about 8 miles.
0800
1852
Ships disappered over the horizon.
HOON LATITUDE 4°29'N; LONGITUDE 104°01'E.
Surfaced and proceeded along estimated track of norning target.
Distance run 178.7. Fuel expended 1723.
June 23
0529
Submerged.
1843
Surfaced. Proceeded to vicinity of AWBS ISLDS.
NOON LATITUDE 4°52'N; LONGITUDE 105°07'E,
Distance run 171.3 niles. Fuel expended 1355.
June 24
0315
Having just reversed course to north, sighted smell patrol bort nearly
dend chead.
0327
Sighted second patrol beat about 2 niles to the west of first.
GRYLING increased speed and hended south.
0356
0402
Ne rest patrol boat challenged with signal light 3 tinos.
Challenge repeated with signal light. GRYLING increased speed to full.
0412
Saw patrol bont the last tine, GRULUG reversed course by gradual
changes thru-est.
-8

— page 129 —
CONFIDENTIAL
U.S.S. GRAYLING

5. DESCRIPTION OF ENEMY WARSHIPS OR MERCHANT SHIPS SIGHTED.

| Date and Time | Position | Course and Speed | Initial Range | Length Msthd. Ht. | Description and Remarks |
|---|---|---|---|---|---|
| May 25 | 6°00'S | 151° | 6000 yds. | 450 ft. | Radar contact - Identif- |
| 2122(H) | 116°51'E | 16.5 k | | | ication not positive. Be- |
| | | | | | lieved to be escorted |
| | | | | | tanker. (Attack #1) |
| May 26 | 6°07'S | 080°T | 16000 yds. | 400 ft. | Engines aft freighter of |
| 1839(H) | 118°42'E | 8 k | | 100 ft. | about 5000 tons (Attack #2) |
| June 7 | 3°12'N | 070°T | 15000 yds. | 400 ft. | Well deck freighter sim- |
| 1850(G) | 108°47'E | 10 k | | 100 ft. | ilar to T.M.M.N.R.U. |
| | | | | | (Attack #3) |
| June 8 | 2°30'N | 190°T | 6900 yds. | 400 ft. | Conventional freighter |
| 0050(G) | 109°27'E | 10 k | | 100 ft. | similar to LISO M.V. |
| | | | | | (Attack #4) |
| June 10 | 3°00'N | 180°T | 10000 yds. | 150 ft. | Patrol boat or subchaser. |
| 0912(G) | 108°42'E | 8 k | | 60 ft. | Echo ranging. |
| June 10 | 2°56'N | 080°T | 14000 yds. | | 2 patrol boats or sub- |
| 2010(G) | 108°18'E | 10 k | | | chasers. |
| June 11 | 2°42'N | 150°T | 10000 yds. | | Patrol boat or subchaser |
| 0523(G) | 106°34'E | 8 k | | | echo ranging. |
| June 15 | 3°17'N | 000 | 15000 yds. | | Medium size freighter. |
| 0146(G) | 104°50'E | 12 k | | | GRAYLING submerged for |
| | | | | | moonlight attack and lost |
| | | | | | target. |
| June 22 | 4°10'N | 345°T | 16000 yds. | | 2 tankers and 1 freighter |
| 0915(G) | 103°50'E | 10 k | | | (Attack #5) |
| June 24 | 3°40'N | 180°T | 15000 yds. | | Patrol boat (possibly |
| 0314 | 104°46'E | 10 k | | | two). |

6. DESCRIPTION OF ALL AIRCRAFT SIGHTED.

| Date and Time | Position | Bearing and Distance | Course and Altitude | Description |
|---|---|---|---|---|
| May 19 | 28°26'S | 090°T | 045°T | PBY |
| 1545 (H) | 112°55'E | 7 miles | 3000 ft. | |
| May 21 | | | | Numerous friendly planes near |
| 0600 - | | | | Broome Gulf. |
| May 22 | 17°49'S | 000°T | 180°T | Probable PBY. Did not reply to |
| 1350 (H) | 114°42'E | 10 miles | 3000-1500 ft. | our recognition signals and con- |
| | | | | tinued heading for GRAYLING, re- |
| | | | | ducing altitude. GRAYLING sub- |
| | | | | merged. |
| May 22 | 17°46'S | 270°T | 000°T-120°T | Same plane as above. |
| 1445 (H) | 114°42'E | 8 miles | 2500 ft. | Sighted after surfacing. |
| May 23 | 13°35'S | 060°T | 180°T | Unidentified, large, twin engine. |
| 0946 (H) | 115°11'E | 8 miles | 3000 ft. | |
| May 26 | 6°08'S | 000°T | 090°T | Unidentified. |
| 0610 (H) | 118°07'E | 9 miles | 3500 ft. | |

- 12 -

— page 130 —
CONFIDENTIAL
7. DETAILS OF ATTACKS.
                                                                U.S.S. GRUNION
                                                                ATTACK #1
                                                                May 25, 1943

LATITUDE 6°00'S                                 LONGITUDE 116°51'E
Tube No.                                        7
Gyro Angle                                      165°
Track Angle                                     45°
Depth Set                                       10 ft.
Target Speed
Set on TDC                                      16.5 kts.

Enemy Course: 151°                              Enemy Speed: 16.5 kts.

Firing Range:                                   3430 yards

Torpedo Run TDC:                                2600 yards

        On course 032°T, making standard speed on two main engines. Overcast and
very dark, visibility poor. At 2122 obtained SJ Radar contact, range 6000 yards,
bearing 292° Relative. Immediately thereafter sighted target with angle-on-the-
bow approximately zero. Turned stern toward target. At 2123 the range was clos-
ing rapidly, so increased speed to standard on four engines. By 2127 plot was
established on 16.5 knots. At 2137 fired first torpedo. At this time target
commenced a large turn to port and commenced firing from a deck gun. As chances
of hitting were now negligible, did not fire more torpedoes.
        An escort was seen to signal to the target with a small signal light at
about 2138.
        The wake of the torpedo could not be seen from the bridge, probably because
of our own wake. The sound operators heard the torpedo leave the tube and make
an apparently normal run. No explosion was heard.
        GRUNION remained on the surface. The target fired about six rounds while
making a circle to the left.
        Radar contact was maintained and full speed used to reach another firing
position. At about 2350, from a position 55 degrees on the starboard bow of the
target, with range 7200 yards, GRUNION turned in for another attack. At this
time the target turned away, changing course from 127°T to 075°T. The chase was
abandoned when radar contact was lost at 16000 yards.
        Identification of the target was not positive. The best estimate is that
it was a medium sized tanker. The escort was small and could not be distin-
guished at three thousand yards. On several occasions the escort sent visual
messages to the target. Radar indicated that the escort stayed close to the target
at all times.

                                        - 13 -

— page 131 —
U.S.S. GRJING
CONFIDE TIL

TTACK #2
May 26, 1943.

LATITUDE 620715
LOFILE 118210
:
:
:
| Tube No. | 1 | | 3 | | 4 | :
:
:
:
| Gyro Angle | 0 | | 0 | | 0 | :
:
:
:
| Track Angle | 90^P | | | | :
:
::
:
| Depth Set | 10 | | 10 | | 12 | :
| Taret Speed | | | | | | :
| Set on TDC | 8 | | | | | :
:
:
:
:
:
:
:
| Enemy Course: 088T | | Her Speed: 8 kts. (90 RP): |
:
:
:
| Firing Range: 1850 vards | | Firing Interval: 6. 12 sec. | :

The target was an unescorted freighter with engines aft. Estinted length
400 feet, of about 5000 tons. Similar in appearance to ITU, but with
built-up bow and larger over-all.
1
it 1742 (H) sighted snoke and commenced approach. The target vas zigzag-
ting radically, the initial angle on the bow wis 120 port, which changed to
160 port. The target then inde several large changes of course to the left and
the range was closed. Sunset was at 1757. t 1836 obt: ined an echo range of
2050 yards which checked within 100 words of the range then on the DC. At
1839-30, on course 180T, commenced firinga spread of 3 torpedoes. Indicated
gyre angles 8 to 14 left (2º div. spread). Sound reported the torpedoes ren
about 10 to the right of the target. Sometime later it was discovered that
the guro regulator switch at the TDC had not been turned on and all torpe-
does were fired with 0 euro angles.
Refined at periscope depth and watched the target after firing. The
target was heard to increase speed to 120 RPM. It was quite dark and the
target's mineuvers could not be determined with certainty. Loud explosions
were heard at 1841-32, 1845-00, 1647-35, 1849-58 and 1853-43. Vent deen
after the second explosion and surfaced at 1938, when sound lost the target.
The terzot could not be located either by sight, or by the SJ Radar.
ث

-14-

— page 132 —
CONFIDENTIAL
                                                                U.S.S. GRAYLING
                                                                ATTACK #3
                                                                June 7, 1943

LATITUDE: 3°12'N                                                LONGITUDE: 108°47'E

| Torp. No.         | 3         | 4         | 1         |

| Gyro angle        | 2°R       | 3°L       | 2°R       |

| Spread            | 0°        | 3°L       | 3°R       |

| Track angle       | 103P      | 100P      | 103P      |

| Depth             | 12        | 12        | 12        |

| Target Speed      | 10        | 10        | 10        |
| Set on TDC        |           |           |           |

| Enemy Course:     | 070°T     | Enemy Speed: | 10 kts. (150 RPM): |

| Firing Range:     | 1300 yds  | Firing Interval: | 7 sec.    |

At 1805(G) sighted masts bearing 237°T and commenced approach. The sun had
set at 1751 and the visibility decreased rapidly during the approach. At 1817
the target appeared to have 2 stacks. At about 1818 another officer looked at
the target and said it appeared to be an engines-aft type.
The target was zigzagging on courses from 045° to 070°T. GRAYLING tried to
cross target's track to get him up-moon, but was unable to do so.
At 1849 obt. had an echo range of 1600 yards and 12° bearing on echo
range of 1300 yards. At 1849-30 had a good view of the target in silhouette and
saw that it was a conventional, single-stack well-deck freighter of about 5000
tons, similar to TAIYU MARU. At this time sound reported hearing screws about
50° to the right of the target. Nothing was seen on this bearing, nor could
it have been seen unless it was close.
With GRAYLING on course 150°T, fired a spread of 3 torpedoes at 1850. Tor-
pedoes being were set in the TDC prior to firing each torpedo.
Sound reported torpedoes running in the direction of the target. 35 seconds
after firing the first torpedo a loud explosion was heard and felt. The target
disappeared from sight, bow first, almost immediately after the explosion. Sound
reported the target's screws had stopped, then reported a crackling disturbance
on the bearing of the target.
In preparation for surfacing, the GRAYLING commenced turning to the reverse of
the torpedo course. At about 1852 sound reported "very fast" screws bearing about
50° to the right of the last position of the target. Nothing could be seen on
this bearing. About 1855 saw a dark shape on the bearing given by sound. Max-
imum periscope visibility at this time was about 3000 yards. Continued watching
this dark shape until it could no longer be seen, at about 1900.
At 1903 nothing could be heard on sound so came to 40 feet and searched
with the SJ Radar. No contact.
At 1911 surfaced and at 1913 sighted a ship, on which the SJ gave a range
of 6900 yards. Commenced closing the range on this ship, which opened fire on
us at 1955. Maintained sight and radar contact while firing batteries and
awaiting moon-set. Then made a surface attack. (See attack no. 4)

                                                                - 15 -

— page 133 —
CO IDENTIAL

LATITUDE 2°30'30"N
U.S.S. GRAYLING
TCK #4
June 7-8, 1943.
LONGITUDE 109°27′30″E
:
:
:
:
:
:
: Tube No.
:
7
:
8
:
9
:
:
:
:
: Gyro Angle
:
430 'L
:
7'L
:
8-40'L
:
:
:
:
: Track Angle
:
95P
:
96P
:
98P
:
:
:
:
:
:
: Depth
:
18
:
18
:
18
: Target Speed
:
:
:
: Set on TDC
10
:
10
:
10
:
:
:
:
Enemy Course:
190°
Enemy Speed: 10 knots.
:
:
:
:
:
: Firing Range:
2440 yards
Firing Interval: 16 sec, 16 sec.:

This target was first picked up by sound (see attack no. 3) and after
surfacing at 1911, sight and radar contacts were obtined, range 6900 yards.
At 1955, after we hid closed the range to 4800 yards, the target opened fire
with a deck gun, meanwhile presenting an angle on the bow of 180°.

The target commenced running close to the string of islands extending from
SOUBI KETJIL to API POINT. This gave us a disadvantageous position both as
regards the moon and navigation, so decided to charge batteries and prepare to
attack after noon-set. The target could be seen with binoculars to 8000 yards,
but radar contact would be lost at about 7000 yards and regained at about 6000
yards. Had little difficulty maintaining 6000-7000 yard range using 2 or 3
main engines. The plot showed that the target was making 10 knots and was
zigzagging on courses between 100°T and 180°T; base course 145°T. Length of zigs
varied from 5 to 20 minutes.

The end-around run was completed at 0 34, so went to battle stations and
prepared to attack. We were now about 6000 yards ahead of the target with the
target on the base course.

At 0048 the target changed course right to 190° and the GRAYLING came to
course 100°T for a stern tube shot; the range was 2400 yards. At 0050 con-
menced firing 3 torpedoes with the data as shown in the table above. A longi--
tudinal spread was intended to be used but due to poor communication between
the after TBT and the TOC, all torpedoes were fired to hit the OT.

The target gave no indication of having sighted us until about four minutes
after firing when an underwater explosion was heard and the target commenced a
turn to the right. At 0056 the target commenced shooting and several shells
were heard goin by.

Contact with the target was lost at 0105. DATUM POINT light had been in
sight since 0015
The target was a freighter similar in appearance to the KISO MARU.

- 16 -

— page 134 —
CONFIDENTIAL
U.S.S. GRIL LING
ATTACK #5
June 22, 1943

| | LATITUDE 4°01'N | | LONGITUDE 103°57'E |
|---|---|---|---|
| Tube No. | 3 | | 4 | | 2 |
| Gyro angle | 001 | | 358 | | 359-30 |
| Track angle | 99°P | | -102°P | | 100°-30'P |
| Spread angle | 0 | | 1½°L | | 1½°R |
| Depth Set | 12 | | 12 | | 12 |
| Target Speed Set on TDC | 10 | | 10 | | 10 |
| Enemy Course: | 031°T | | Enemy Speed: | 10 knots |
| Firing Range: | 2800 yards | | Firing Interval: | 8 sec, 9½ sec. |
| Firing Course: | 112°T | | | |

At 0215(G) while patrolling on course 150°T off the East coast of Malay
Peninsula, sighted smoke on the horizon bearing 178.5°T. At 0221 saw that there
were three ships in line on northerly course. The visibility was too great to
permit a surface attack, so GRIL LING maintained visual contact about 5 to 6
miles ahead of the formation. Distance was increased to 10 miles just before
daylight.
Sunrise was at 0556. At 0531 GRIL LING submerged. At 0540 sighted the
formation bearing 161°T and commenced the approach. The contact scouting during
the night indicated a target speed of about 10 knots, base course 343°T.
In daylight the formation was seen to consist of a tanker similar to
KAIZYO MARU (center), a small freighter similar to INUTA MARU (starboard flank),
and a tanker similar to EIYO MARU (port flank). These ships maintained a close
formation while making frequent zigs of 30-50 degrees. The approach was made on
the tanker on the port flank.
At 0630-15 fired three torpedoes with the data given in the above table.
The periscope bearing was set on the TDC for each shot. Point of aim was the MOT.
One minute and forty-five seconds after firing commenced, a torpedo was seen
to hit the target. A screen of water covered the target for about 5
seconds.
When the water had subsided, the hole made by the torpedo could be seen be-
low the after edge of the bridge. The top of the hole extended about five feet
above the water line and 25 feet in a fore and aft direction. A photograph was
taken at this time. The target's speed decreased slowly as the target made a two-
thirds circle to the right; the freighter moved ahead of the target and made a
circle to the left. The target turned right about 90°.
A series of rapid explosions, probably gun fire, were heard in the sound
gear and one or two were heard through the hull. At 0635-57 a loud explosion,
probably end-of-run explosion, was heard. At 0639-30 another similar explosion
was heard.
The target developed a slight port list and a sag amidships. The main deck
just aft of the bridge was nearly awash.
At 0650 a heavy rain squall enveloped the target and visibility be-
came less than one thousand yards. The range to the target at this time was

- 17 -

— page 135 —
U.S.S. FLYING

CONFIDENTIAL
ATTACK #5 Continued

about four thousand yards. When last seen, a large cloud of smoke hung over
the target. GRUNT proceeded on course 120°T.
About 0717 with visibility improving, smoke was seen bearing 050°T.
GRUNT changed course to this bearing. At 0725 two ships were seen on bear-
ing 052°, distance 8 miles. One of these was definitely identified as the un-
damaged tanker. The second ship was either lower in the water or more distant
and could not be identified. The estimated course of these ships was 090°T.
GRUNT changed course to 060°T. At 0800 then two ships disappeared below
the horizon on bearing 051 and 053°T. Minimum visibility in any direction was
now 8 miles.

8. ENEMY A/S MEASURES.

A/S measures were unusually light in the assigned area. Patrol boats
equipped for echo ranging arrived at the scene of attacks a day or two after
the attacks had been made.
The freighter attacked near De Bril Bank on the evening of May 26 was un-
doubtedly fitted with depth charge throwers.

9. MAJOR DEFECTS EXPERIENCED.

(a) Main Generators - Megger reading on No. 4 Main Generator at beginning
of patrol varied between 175,000 and 50,000 ohms. Reading is now steady
at 50,000. This generator is considered unsafe to use except in an
emergency.

(b) Fathometer head flooded early in the patrol, putting fathometer out of
commission. Present head installed during last refit.

(c) Air leak in No. 4 air bank in group of bottles in No. 5D M.B.T. and in
group in No. 5F M.B.T. necessitating cutting out seven of the ten
bottles in this air bank.

(d) Gyro. Main rotor bearing failed. Experienced difficulty in holding
vacuum until last two weeks of patrol. Follow-up system out of com-
mission for three days due to incorrect electrical connections made
during last refit.

(e) Stern Planes jammed in hard dive position due to failure of stop to
operate properly.

(f) Port Sound Head (QC-JK) - Unable to raise or hold in raised position
with hydraulic power. Necessary to use chain fall for raising.

(g) Starboard Main Motor and Reduction Gear lub oil sump - Salt water
entered sump from bilges through sluice valve packing.

(h) Leak in P & O. C. compensating line in Control Room.

(i) M.T. Motors - Full voltage ground due to piece of gasket covered with car-
bon dust left in housing during refit. Corrected by removing loose gasket.

- 18 -

— page 136 —
U.S.S. CRYING
CONFIDENTIAL
L.JOR DEFECTS EXPERIENCED (cont.)
8 0280
(j) No. 1 High Pressure Air Compressor - Piston seizure in 2d stare due to
insufficient clearance in ball and socket wrist joint. Increased clear-
ance and used air compressor although 2d stage discharge pressure was
low.

(k) TDC - Below 620 yards range on TDC, gyro angles out 8 to 15 degrees (Test
Problen 18). Range setting device very stiff between 5300 and 6800 yards.
Solenoid on after gyro angle offset shaft burned out.

10. RUARKS.

Three of the GRMLING officers have not attended submarine school and two
others are recent tradurtes of the school and required further training. For
use in instruction purposes, three ship nodels were borrowed from the Squadron
Her College set. During the patrol, a port: ble attack teacher was developed
and used to advantage.
The attack teacher was located in the Conning Tower and consisted of:

1. A tro.ck - 2 wires nearly the length of the Conning Tower and mrked
to scole for ranges to 8000 yards.

2. Target platform - s sheet netal disc covered with a commss rose:
carried the target along the track.

3. "Periscope" - The ship's nvirtion stadineter. Relative bearing ws
supplied by plot; angle on the bow and rene were obtrined at the
"periscope".

Plot, in the Control Roon, furnished the Conning Tower Telker with the angle
on the bow and renre prior to each periscope observation. The Conning Tower
Talker set up the terret and gave the relative berrin on each "RK". Own ships!
course and speed were introduced in the TDC either manually or autentically.
Three or four approaches could be made in an hour. The normal periscope
observations on station were in no way interferred with.
Officers stations were rotated for each approach. All officers thus ac-
quired experience as Approach Officer, Assistant Approach Officer, Data Computer
Operator and on the Plot.
More models of freighters and tankers are desired.

- 19-

— page 137 —
FC5-6/16-3
Serial No. 0280.
SUEM RIEL SQUALION SIX
C-O-N-F-I-D-E-M-T-I-A-L
FIRST ELOR ET to
C.J., USS GRAYLING Conf.
1tr. SS209/Alo-3 Serial
(014) of July, 1943.
From:
To
:
Subject:
1.
(6/Cy)
Care of Flect Post Office,
San Francisco, California,
July 7, 1947.
The Commander Submarine Squadron SIX.
The Cormandor TASK FOOL SLVE TY-OL.
U.S.S. GRAYLING
L
-
Seventil war Patrol
Comment OL.
This was the seventh war patrol for the CRAYLI.G.
Of the fifty days at sea thirty seven were spent in the arca
north of the Malay Barrier. The patrol was terrated in accorda
with the provisions of the operation order.
2.
GRAYLING returned from time atrol in a generally
excellent material condition. Cleanliness of machinery and equip-
ment was above even the usual high standard maintained by tho sui-
marines of this squadron. The GRANDC is currently beang refatte
by Pelias in preparation for the Eighth War Patrol and no extensio
Followin the next
beyond the normal refit
patrol GRAYLIG will be
listed by the Commandi.
of basic report can be
exception of number 14 main generator. The low ground reading
described iscause eu tic accimulation of carbon dust mixed with
oil which resists all cfforts to remove it sort of complete dis-
assembly of the main generators. Complete disassembly is not con-
sidered practicable during tonder refit periods but such clean
as is possible without disassembly has to date haintained the
grounds withon safe limits even though they become lower on occl
successive patrol. Disassembly and cleaning of main generators
should be accomplised during each lavy Yard period and if this i
Conc it is considered that the toner ca. control the situation
between Navy Yard overhauls. It is believed probable that the
ground reading on number four generator of GRAYDI cun bo
sufficiently increased durim the current refit to cluble safe
operation of the contrator during the next patrol.
periodu is forescen.
iven a lav Yard overhaul. All items
Officer as major efects in paragraph S
rencdicd by the tender force wit the possit
3.
Health during the patrol was excellent. There wer
no sick days. On arrival examination the indical Officer found
fow minor ailments but all men should be able to me the next
patrol.
14.
Six contacts were made with possible torpedo tzi
and attacks were made on five of ticse. The sixth disappeared aft
the GRAYLING subnorged for a moonli it attack and contact was neve
regained. The first attack was made with torpeão run of 2000
when it was apparent that the submarine must be sighted soon.
-1-

— page 139 —
F05-6/A16-3
Serial No.0208.
C-O-II-FI-D-L-N-T-I-A-L

FIRST LILOR SLLENT to
C.., USS GRAYLING Conf.
1tr. SS209/A16-3 Scrial
(014) of July 6, 1943.
Subject:
SUBLARINE SUADRON SIX
(6/C)
Care of Fleet Post Office,
San Francisco, California,
July 7, 1943.

U.S.S. CRAYLING - Seventh war Patrol - Comment on.

DAMAGED
1 AC (EIYO MARU class)
8647 tons

[SIGNATURE: William Manfield]
WILLIAMFIELD,
Acting.

— page 140 —
FE24-71/A16-3
Serial 0614
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to
CO, USS GRAYLING Conf.
ltr. SS209/A16-3 serial
(014) of 6 July, 1943.

From: The Commander Task Force SEVENTY-ONE.
To: The Commander in Chief, U.S. FLEET.
Via: The Commander SEVENTH FLEET.

Subject: U.S.S. GRAYLING - Seventh War Patrol -
Comment on.

1. Forwarded. The remarks of Commander Submarine
Squadron SIX are concurred in.

2. While observation was incomplete, it appears
that the thirteen torpedoes were fired without any erratic per-
formance and there were no prematures.

3. The details of the portable attack teacher, which
was developed and used during this patrol, will be brought to the
attention of other submarines during their refit periods. The
initiative and ingenuity of the GRAYLING in devising this system
of training is commendable.

4. The total failure of the fathometer early in the
Patrol was a distinct handicap to the GRAYLING in that it re-
stricted their movements in the shallow water areas of the South
China Sea.

5. The Commander Task Force SEVENTY-ONE congratulates
the Commanding Officer, Officers, and crew on another successful
Patrol during which the following damage was inflicted on the
enemy:

SUNK:
1 AK (TAZAN MARU class) 5,500 tons
2 Small vessels (by gunfire) 115 tons
TOTAL.... 5,615 tons

DAMAGED: (Probably sunk)
1 AO (EIYO MARU class) 8,674 tons

R. W. CHRISTIE.

DISTRIBUTION
(over)
- 1 - U.S. NAVAL FORCES
WESTERN AUSTRALIA

10 July, 1943.

8 0280
11-bt