U.S.S. BOWFIN (SS-287) — war patrol report SS-287_BOWFIN_Part2.pdf

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FF12-10/A16-3(15)/(16) SUBMARINE FORCE, PACIFIC FLEET mr
Serial .01402 Care of Fleet Post Office,
San Francisco, California,
CONFIDENTIAL 12 July 1944.

THIRD ENDORSEMENT to NOTE: THIS REPORT WILL BE
BOWFIN Report of DESTROYED PRIOR TO
Fifth War Patrol. ENTERING PATROL AREA.

COMSUBSPAC PATROL REPORT NO. 460
U.S.S. BOWFIN - FIFTH WAR PATROL.

From: The Commander Submarine Force, Pacific Fleet.
To : The Commander-in-Chief, United States Fleet.
Via : The Commander-in-Chief, U.S. Pacific Fleet.

Subject: U.S.S. BOWFIN (SS287) - Report of Fifth War Patrol.
(25 April to 21 June 1944).

1. The fifth war patrol of the BOWFIN was the first for
the Commanding Officer, as such. The patrol was conducted in the
Palau Area.

2. Excellent area coverage was maintained and three con-
tacts worthy of torpedo fire made, one of which the BOWFIN was able to
close and attack.

3. This patrol is designated as "Successful" for Combat
Insignia Award.

4. The Commander Submarine Force, Pacific Fleet, congra-
tulates the Commanding Officer, officers, and crew for this aggressive
patrol. While damage to the enemy on this patrol was not as severe as
in some of the previous patrols of the BOWFIN, the aggressive and
tenacious characteristics of this submarine are still evident. The
BOWFIN is credited with having inflicted the following damage upon the
enemy during this fifth war patrol:

S U N K
1 - Freighter (similar KENYO MARU) - 6,500 tons (Attack No. 1)

C. A. LOCKWOOD, Jr.

DISTRIBUTION:
(Complete Reports)
Cominch (7)
CNO (5)
Cincpac (6)
Intel.Cen.Pac.Ocean Areas (1)
Comservpac (1) ComsubspacSubordcom (3)
Cinclant (2) All Squadron and Div.
Comsubslant (8) Commanders, Subspac (2)
S/M School, NL (2) Comsubstrainpac (2)
Comsopac (2) All Submarines, Subspac (1)
Comsowespac (1)
Comsubsowespac (2) [HANDWRITTEN: 60] [SIGNATURE: E. L. Hynes]
CTF 72 (2) E. L. HYNES, 2nd,
Comnorpac (1) Flag Secretary.
Comsubspac (40)
SUBAD, MI (2)

[STAMP: FILMED]
[HANDWRITTEN: 56]

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[HANDWRITTEN: 1ST COPY]

SS287/A16/A9
Serial 021

U.S.S. BOWFIN (SS287)
Care of Fleet Post Office,
San Francisco, Calif.

[CROSSED OUT: C-O-N-F-I-D-E-N-T-I-A-L] [STAMP: DECLASSIFIED] 13 September 1944

From: The Commanding Officer.
To : The Commander-in-Chief, U.S. Fleet.
Via : (1) The Commander Submarine Division 42.
(2) The Commander Submarine Squadron 4.
(3) The Commander Submarine Force, Pacific Fleet.

Subject: U.S.S. BOWFIN (SS287) - Report of War Patrol Number Six.

Enclosure: (A) Subject Report.
(B) Track Chart (For ComSubPac).

1. Enclosure (A) covering the sixth war patrol of this vessel
conducted in the central NANSEI SHOTO area during the period 16 July 1944
to 13 September 1944 is forwarded herewith.

[SIGNATURE: J. C. Corbus]
JOHN CORBUS

[STAMP: DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C]
BY [HANDWRITTEN: OP-09B9C] DATE [HANDWRITTEN: 5/24/72] [STAMP: DECLASSIFIED]

[HANDWRITTEN: 89755]

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The provided image is a scan of a document, likely a report from a military context, specifically mentioning "U.S.S. BOWFIN (SS287) - Report of War Patrol Number Six." The text is typed, resembling a typewriter font, and appears somewhat faded in places. There are also some minor smudges and imperfections typical of an old scanned document.

Here's the transcription of the text, preserving line breaks, capitalization, and distinguishing between typed and any potential handwritten text (though none appears to be present in this specific page).

CONFIDENTIAL
Subject: U.S.S. BOWFIN (SS287) - Report of War Patrol Number Six.

— page 9 —
`CONFIDENTIAL`
Subject: _ _ _ _ _ U.S.S. BOWFIN (SS287) - Report of War Patrol Number Six. _ _ _
9 August.

Patrolling to westward of MINAMI DAITO JIMA.

Because of the close proximity of DAITO JIMA. and the possibility
of finding a ship loading sugar or phosphate at the docks felt that it
was worth while investigating both islands.

0500 Submerged.

Just prior to diving heard a very strong signal on 92 m.c. Feel
confident there is a radar installed on one of these islands.

Conducted submerged patrol three miles off western coast of MINAMI
DAITO and KITAI DAITO. Observed a new concrete dock in vicinity of
loading cranes on the western side of MINAMI DAITO that is not shown on
the chart. There is also a concrete ramp leading to the water. The
refinery on this island is in operation as indicated by the smoke.
The precipitous cliffs that surround the island would make an opposed
landing difficult.

On KITA DAITO there are two tall masts that might be radio masts
located near the southwestern landing. No indications of fortifications
or barracks. There was no shipping at either island.

Currents in the vicinity of these islands are predominently wes-
terly. The charts are very good. Excellent fixes were obtained on
tangents and high points.

1231 Sighted single engined plane heading out from KITA DAITO. He was fly-
ing close to the water as if on patrol so went to 150 feet in view of
smooth sea. This plane was the only one sighted but the prompt
counter measures following the attack indicates that there
is an air field on one of these islands.

1959 Surfaced.

2010 Radar contact bearing 028° (T), range 14,800 yards. This proved to be
a convoy of one fair sized ship with two or possibly three smaller
ships that were not picked up until range was about 8000 yards. Base
course 140° (T) speed 7 knots. This course headed them for MINAMI
DAITO or possibly between the two islands. Decided to track them until
they either moored or were clear of the islands. Visibility poor be-
cause of haze. Tracked them into landing on western side of the island.
Had indications of radar on 300 m.c. Believed we had one fair sized
ship escorted by two or three Sub Chasers or MTBs.

2234 Radar contact bearing 080° (T), range 8900 yards. Moon rose and sil-
houetted this target which proved to be a small trawler or sampan.
Two smaller targets accompanied him. Base course again 140° (T) speed
7 knots heading him for KITA DAITO. This target appears smaller than

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ENCLOSURE (..)

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CONFIDENTIAL
Subject: - - - U.S.S. BOWFIN (SS287) - Report of War Patrol Number Six. - - -

2330 one in the first convoy, so at
     Discontinued tracking and started sweep to south of island to insure
     that the first convoy had not sneaked down along the coast and headed
     south.

10 August.

0120 Patrolling off MINAMI DAITO JIMA.
     Completed sweep to the south of MINAMI DAITO. No contacts. Apparent-
     ly the convoy has anchored or moored off western side of island. Com-
     menced working to northwestward. Plan to make submerged reconnaissance
     of landing places.
0205 Commenced getting false contacts on radar. Ranges varied between
     3600 and 4500 yards. Nothing in sight.
0400 Radar contact at 14,100 yards bearing 034° (T). Unable to develope
     this contact due to dawn breaking.
0451 Submerged. Headed in for landing on western side of MINAMI DAITO.
0625 Closed landing place to 4,000 yards. Nothing present. C/C to invest-
     igate northern landing and then plan to work up to KITA DAITO.
0715 Sighted one trawler type escort and one small merchant ship bearing
     090° (T), range 5,000 yards. Another small merchant ship bore 050° (T),
     range 4,500 yards proceeding on same course as the escort. Went to
     Battle Stations Torpedo. The escort and one accompanying ship were in
     the sun glare and had large angles on the bow. The other MARU was lag-
     ging so commenced approach on him. The course of all three ships in-
     dicated they were heading for the landing on the western side of
     MINAMI DAITO. As we closed our target watched the other two ships head in
     and lie off the landing. Decided to try and get all three if they
     moored alongside the new concrete dock. Broke off approach and headed
     for the landing.
0813 Escort c/c to 020° and increased speed, leaving one ship moored to the
     landing and the other lying to in the vicinity.
0849 Headed in for landing on course 105° (T). Will shoot the ship lying
     to and then swing to shoot the one that is moored. Characteristics
     of these MARUS are as follows: High clipper bow, high foremast, long
     low well deck forward with at least two loading hatches, small goal
     post aft, bridge and high stack aft. They carried two life boats aft
     on either side of the bridge, and mounted two machine guns, one on the
     bow and the other on top of the bridge. Identified as Sugar Charlie
     in J.M.S.T. folder (Allied air forces, Southwest Pacific Area, 20th
     May 1943). Ships appeared to be riding high and empty. Estimated
     length at 200 feet, draft at 6 feet, tonnage at 1,000 tons.
0919 In position 1,750 yards from ship lying to. He has about 150° port
     angle on the bow. Decided to fire 3 torpedoes set at two feet due to
     the small length of target presented.
0923 Commenced firing No. 1, No. 2 and No. 3 tubes at 10 second interval.
     Observed first torpedo just miss the stern of the target and explode
     on the beach. Second torpedo hit him on port quarter and he was

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ENCLOSURE (A)

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CONFIDENTIALL
Subject: U.S.S. BOWFIN (SS287) - Report of War Patrol Number Six.

in column, one small one ahead and one astern of the larger ship.

The larger merchantman had a clipper bow, tall foremast, deep
well deck forward, high bridge and superstructure, small stack just
abaft the bridge, tall mainmast, counter stern and built up poop.
A heavy machine gun was mounted on the bridge and when we closed him
later eight depth charges were seen on the stern. Length by peri-
scope 175 feet. Estimate that he displaces 1,000 tons, altho the high
superstructure and poop gives the impression of a larger ship.

The smaller marus were estimated to be 100 feet long and of 300
tons displacement. They had a raked bow, tall foremast, deep well
deck, engines and pilot house aft, tall mainmast and counter stern.
A heavy machine gun was mounted near the foremast.

0953 (K) Battle Stations Gun Action - All Guns. Commenced closing the range
at 16 knots. Plan to close to effective range, swing right to parallel
the column and pick them off starting from the rear.

Upon sighting us all ships changed course to 300° (T) and the two
small marus took position about 500 yards ahead and slightly on each
bow of the larger maru. When range closed to 4,500 yards all three
ships opened up with machine guns - all shots were short.

1022 (K) Opened fire with 4 inch gun on the larger maru at 4,000 yards. Fire
ineffective due to large range rate. The two smaller ships turned
and headed for us. Shifted fire of 4 inch to them using the forward
20 MM on the larger maru. Several 4 inch straddles and close misses
apparently decided them against closing to a shorter range for they
sheared off and opened out, continuing however to fire at us. Range
had been closed sufficiently so that enemy fire was falling all
around BOWFIN but fortunately no casualties to personnel occurred.
The whine of machine gun bullets is not a pleasant sound.

Shifted fire of 4 inch to larger maru using the after 20 MM
to harass the two small marus. Fire ineffective at this range but
effective in preventing them closing the range. At this stage sin-
cerely wished we had a 40 MM gun mounted aft. No doubt exists what
we could have stopped all three ships had such a gun been installed.
The 4 inch scored several effective hits and near misses on the
larger maru causing fires to be started forward and aft and reducing
his speed. Maneuvered ship to keep the range between 2,500 yards
and 3,000 yards. The Nip countered by swinging his ship to keep the
stern towards us, thereby presenting as small a target as possible.

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ENCLOSURE (A)

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- The provided image is a page from a WWII submarine patrol report. It contains typed text with some faded sections. There are no handwritten annotations, corrections, or marginalia. The page number is at the bottom center.

Here's the transcription:

CONFIDENTIAL

Subject: U.S.S. BOFFIN (SS287) - Report of War Patrol Number Six.

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Subject:
U.S.S. BOWFIN (SS287) - Report of War Patrol Number Six.
CONFIDENTIAL

ENCLOSURE (C)
1 - 30 -
(F) SHIP CONTACTS
No. | Time | Date | Lat. | Long. | Contacts | Range | [Course/Speed] | [P/R/S&P] | Remarks
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
1. | 0757(I) | 8-5-44 | 27°-30.0'N | 129°-30.7'E | 1 Large Target | 14,800 yds. | 120°(T) 7 kts. | R | 120 P angle on bow. Could not close.
2. | 2010(I) | 8-9-44 | 25°-56.2'N | 131°-09.3'E | 1 Medium Target (two masted) | 14,800 yds. | 140°(T) 7 kts. | R | Tracked into landing at South Daito Shima.
3. | 2220(I) | 3-9-44 | 25°-56.2'N | 131°-09.3'E | 1 or 2 small Targets. | 12,500 yds. | 140°(T) 7 kts. | R | Went around North Daito Shima.
4. | 0715(I) | 8-10-44 | 25°-52.2'N | 131°-11.5'E | 2 Sugar Charlies | 3,400 yds. | 220°(T) 4 kts. | P | Sunk the Sugar Charlies with torpedoes.
5. | 1104(I) | 8-11-44 | 27°-13.5'N | 126°-39.4'E | 1 Escort | 3,000 yds. | 223°(T) 7 kts. | S&P | Too small to shoot. Avoided.
6. | 1031(I) | 8-16-44 | 27°-39.4'E | 126°-39.4'E | 1 Fishing boat | 10,000 yds. | 090°(T) 2 kts. | P | Disappeared.
7. | 1202(I) | 8-16-44 | 27°-15.8'N | 128°-06.8'E | 1 Sail boat | 10,000 yds. | 210°(T) 4 kts. | P | Avoided.
8. | 1750(I) | 8-16-44 | 27°-14.3'N | 128°-05.9'E | 2 Sail boats | 6,000 yds. | Unknown | P | Avoided.
9. | 0619(I) | 8-19-44 | 26°-30.0'N | 127°-20.3'E | 3 Destroyers | 17,100 yds. | 030°(T) 9 kts. | P | Made approach, did not fire.
10. | 0840(I) | 8-19-44 | 26°-30.0'N | 127°-20.3'E | 3 AP's or AK's | 17,100 yds. | 150°(T) 8 kts. | P | Only four black columns of visible. Could not close.
11. | 0410(I) | 8-22-44 | 27°-01.1'N | 127°-22.5'E | Unknown | 26,000 yds. | Unknown | R | 2. attached. See attack number
12. | 1531(I) | 8-22-44 | 29°-00.0'N | 128°-21.5'E | 1 Patrol Craft | 26,000 yds. | Unknown | R | appeared to be headed for convoy. avoided.

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ENCLOSURE (C)
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(F) SHIP CONTACTS

No. Date | Lat. | Type(s) | Initial | Approx. Ho/ | Remarks
| Long. | | Range | CSE/Sp. Contacted |
13. 1101(I) | 28°-01'N | 1 Small Patrol | 2,000 yds. | 020°(T) | appeared to be on routine
8-23-44 | 128°-42.8'E | Craft | | Unknown | patrol. avoided.
14. 0920(I) | 28°-01'N | 1 Small Patrol | 6,000 yds. | 220°(T) | P appeared to be patrolling
8-26-44 | 128°-44.3'E | Craft | | 7 kts. | area. avoided.
15. 073(C) | 28°-19.5'N | 1 Trawler | 14,000 yds. | 3rd(C) Lookout See attack harbor 3.
8-28-44 | 128°-2.4'E | | | 7 kts. |
16. 0902(K) | 31°-47.8'N | 3 Small | 14,500 yds. | 110°(T) Lookout See attack
9-4-44 | 131°-44.1'E | Merchantmen | | 7 kts. |

CONFIDENTIAL
Subject:
U.S.S. BOFFIN (SS287) - Report of War Patrol Number Six.

— page 44 —
CONFIDENTIAL
Subject: U.S.S. BOWFIN (SS287) - Report of War Patrol Number Six.
(H) ATTACK DATA
U.S.S. BOWFIN (SS287) Torpedo Attack No. 2 Patrol No. 6
Time: 2212 (I) Date: 22 August 1944 Lat. 29° - 32.4'N, Long. 129° - 31.1'E

Target Data - Damage Inflicted

Description
Convoy consisted of three AP-AKs steaming in two rough columns, escorted by
two MINEKAZE Class Destroyers. Identifying characteristics of the ships were as
follows:
1. MKFKM sequence with straight bow, split superstructure, well deck forward
and aft and counter stern. (Similar to LIMA MARU, pg. 246 ONI 208J).
2. MKFKM sequence with straight bow, split superstructure, well deck forward
and aft and cruiser stern. (Similar to ARGUN MARU, pg. 247 ONI 208J).
3. MKFKM sequence with raked bow, composite superstructure (2 decks), shallow
well deck forward and aft and cruiser stern. (Similar to NANA MARU, pg. 119 ONI
208J).
4. Escorts were definitely MINEKAZE Class Destroyers.

Convoy was first contacted by radar just before morning twilight. Unable to
effect submerged attack. Made a daylight end run, tracking targets on a mean base
course of 040° (T), zigzagging between 020° (T) and 060° (T), speed 9 knots. A night
surface attack was made from the port side. Convoy was divided into two target
groups to benefit by large spread coverage. Fired six (6) torpedoes at the first
group consisting of the LIMA MARU, the ARGUN MARU and the rear DD. Came right and
fired four (4) torpedoes at the second group consisting of the NANA MARU and the
leading DD.

Ships Sunk
1. AK-AP of LIMA MARU Class. Length 445 feet. 7,098 tons.
2. AK-AP of ARGUN MARU Class. Length 415 feet. 6,682 tons.
3. MINEKAZE Class Destroyer. Length 336 feet. 1,345 tons.
4. MINEKAZE Class Destroyer. Length 336 feet. 1,345 tons.

Ships Damaged
1. AK-AP of NANA MARU Class. Length 446 feet. 6,764 tons.

Damage Determined by
1. Two hits observed in LIMA MARU, the first about one third the way back to
the bridge and the second just abaft the bridge. The first hit practically tore her
bow off, the second broke her back. Saw stern rise high out of the water. Saw ship
sink.

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— page 46 —
- The user wants to transcribe the text from the provided image.
- The image contains a table with various details about torpedo attacks.
- I need to be careful with line breaks, spacing, and special characters like fractions.
- I will transcribe column by column for the table data.

**Transcription Plan:**
1.  **CONFIDENTIAL**
2.  **Subject:** U.S.S. BOFIN (SS287) - Report of War Patrol Number Six.
3.  **TORPEDO ATTACK NO. 2**
4.  **Table Header:** No. 1 | No. 2 | No. 3 | No. 4 | No. 5 | No. 6
5.  **Table Data (row by row):**
    *   Tubes fired:
    *   Track angle:
    *   Gyro angle:
    *   Depth Set:
    *   Hit or Miss:
    *   Erratic:
    *   Mark Torpedo:
    *   Serial No.:
    *   Mark Exploder:
    *   Serial No.:
    *   Actuation Set:
    *   Actuation Actual:
    *   Mark Warhead:
    *   Serial No.:
    *   Explosive:
    *   Firing interval:
    *   Type Spread:
    *   Sea Conditions:
    *   Overhaul Activity:
6.  **Footer:** - 43 - | ENCLOSURE (A)

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## The Story of the USS Bowfin (SS-287) - War Patrol Number Six

This document is a page from the war patrol report of the USS Bowfin (SS-287), specifically detailing "TORPEDO ATTACK NO. 2" during its sixth war patrol. The report provides a tabular breakdown of four torpedoes fired (No. 7, 8, 9, and 10), their settings, and outcomes, followed by remarks about the attack.

**Torpedo Attack Details:**

The report lists four torpedoes, numbered 7 through 10, with their individual characteristics and results:

*   **Tubes Fired:** No. 7, No. 8, No. 9, No. 10
*   **Track Angle:** All four torpedoes were set for a track angle of 114½ P (Port).
*   **Gyro Angle:**
    *   No. 7: 168½
    *   No. 8: 165½
    *   No. 9: 163½
    *   No. 10: 165
*   **Depth Set:** All four torpedoes were set to run at a depth of 6 ft.
*   **Hit or Miss:**
    *   No. 7: Hit
    *   No. 8: Hit
    *   No. 9: Miss
    *   No. 10: Miss
*

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'CONFIDENTIAL
Subject: U.S.S. I FIN (SS287) - Report of War Patrol Number Six.

TORPEDO ATTACK No. 3

| | No. 7 | No. 8 | No. 9 |
|---|---|---|---|
| Tube Fired | No. 7 | No. 8 | No. 9 |
| Track angle | 099 S | 102-3/4 S | 109 S |
| Gyro angle | 189 | 187 | 189-3/4 |
| Depth Set | 2 ft. | 0 | 0 |
| Hit or Miss | Miss | Miss | Miss |
| Erratic | No | Possible | No |
| Mark Torpedo | 18 | 18 | 18 |
| Serial No. | 54828 | 55026 | 54905 |
| Mark Exploder | 8-5 | 8-5 | 8-5 |
| Serial No. | 8361 | 9534 | 8855 |
| Actuation Set | Contact | Contact | Contact |
| Actuation actual | Miss | Miss | Miss |
| Mark Warhead | 18-2 | 18-2 | 18-2 |
| Serial No. | 2336 | 2324 | 1432 |
| Explosive | Torpex | Torpex | Torpex |
| Firing Interval | 0 | 2m - 9s | 1m - 26s |
| Type Spread | | Periscope | |
| Sea Conditions | | Moderate | |
| Overhaul Activity | | SubBase, Pearl Harbor | |

REMARKS: Plot indicates that all torpedoes should have hit target. It is
believed that No. 7 and No. 9 ran under target and that No. 8 possibly ran erratic.

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— page 51 —
- 43 - ENCLOSURE (A)

CONFIDENTIAL

Subject: U.S.S. BOWFIN (SS287) - Report of War Patrol Number Six.

— page 55 —
The provided text is a transcription of a WWII submarine patrol report page. It details various issues encountered with the submarine's equipment during its sixth war patrol.

Here's the transcription, preserving formatting and distinguishing between typed and handwritten text:

CONFIDENTIAL

Subject: U.S.S. BOWFIN (SS287) - Report of War Patrol Number Six.

— page 58 —
CONFIDENTILL
Subject: U.S.S. BOFFIN (SS287) - Report of War Patrol Number Six.

plane came in. The maximum range of contacts obtained was 30 miles. A new oper-
ating policy for the BOFFIN was in effect this run due to reports of night flying
planes in the area - the SD was keyed five seconds out of every thirty during the
daytime, and kept in a standby condition at night (i.c.: mast raised, equipment
warmed up, Variac on zero) and was keyed at night on reception of strong APR con-
tacts on suspected aircraft radar frequencies. (See separate APR report.)

The SJa gave excellent results. During the end run on 22 August, the
target was tracked by radar in broad daylight from 1500 to 1800 LZT at ranges up
to 45,000 yards with the targets completely out of sight. Land contacts at night
were made up to 85,000 yards. Night search was made using the PPI scope on the
80,000 yard range scale, shifting to the "A" scope when contact was made. Ex-
cellent performance was marred in two instances. The reception of close aboard
contacts discussed in the narrative is still unexplained. All were good pips,
some reaching saturation size at close range (about 1,000 yards) and tracking
on definite courses and speeds up to 30 knots. One in particular was tracked off
the port quarter from 3,000 to 6,400 yards before contact was lost. During the
night attack on 22 August, ability to distinguish convoy formation on the PPI
was impaired by strong minor lobes, emanating both from the surrounding land and
from the large targets. If the gain was cut down to get rid of the minor lobes,
the smaller escort pips disappeared, and since the escorts were maneuvering close
aboard the large targets, it was difficult to keep them located at all times.
The APR was kept in continuous operation while in enemy waters, with
numerous contacts as noted in the separate report.

Casualties experienced and corrective action taken are listed below:
(A) SJ RADAR - Refitted by USS FULTON at 3107 hours of operation.
1. ANTENNA, TRAINING MECHANISM, AND FEEDERS.
(a) At 3155:50 hours, number one collector ring came loose. Re-
placed collector ring assembly from spares, straightened and resoldered
damaged assembly and placed in spares.
(b) At 3181:46 hours, number one collector ring came loose again.
Installed repaired ring assembly and noticed that gear cover in feeder
was not under holding-down pin and had been placing pressure on bottom
of number one ring. Cover was placed under pin to give all-around
clearance to rings. Damaged rings were repaired and placed in spares.
Operation normal.

2. RANGE INDICATOR.
(a) At 3117:12 hours, had no range step, precision sweep present.
Found V-13 tube, type 6SN7, with a broken envelope. Replaced tube,
operation normal.

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ENCLOSURE (A)

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CONFIDENTIAL
(C) RWR (Cont'd)

Radar interference or jamming - information.

Following is a list of radar interference or jamming encountered. Some substan-
tial data, such as frequency and PRF, are taken from APR-1 contact data obtained at the
time of contact.

A. NATURE
1. Radar
2. Radar
3. Radar
4. Radar
5. Radar
6. Radar
7. Radar

B. POSIT
28 -29.5'N
130°-44.0'E
27 -42.5'N
129°-33.5'E
28 -01.2'N
130°-19.3'E
30 -09.2'N
142°-58.0'E
29 -43.1'N
140°-58.0'E
29 -51.9'N
142°-58.0'E
27 -58.2'N
129°-51.8'E

C. TYPE BEAM
340°(T)
---
3 RPM
Sweep Rate
Pulse Rate Varied to
lock with
ours.
158°(T)
---
10 RPM
Varied
075°(T)
---
10 RPM
No data
090°(T)
---
11 RPM
Varied
120°(T)
---
11 RPM
Varied
160°(T)
---
None
Steady
60 cps
090°(T)
---
4 RPM
60 cps

D. Type own
Radar
Sja
"Y"
Sja
"Y"
Sja
"Y"
Sja
"Y"
SD-2
SD-2
SD-2

E. Emanated
from own
forces or
enemy.
Own Forces
Own Forces
Own Forces
Own Forces
Enemy
Enemy
Enemy

F. Remarks
Probably
STURGEON
Probably
BIRBEL -
Could not
Communicate.
Probably
PLICE
Exchanged
Recco Signals
and calls
with SUNFISH
with GUARDFISH
*See Note
#1
*See Note
#1
Very Loud APR
Contact on 93
miles. Indicat-
ions on SD
came 1 hr.
intervals.
Probably land
or ship based.

* Note #1. APR-1 detected signal at 0809 LZT, very weak,
at 0815. At 0834 had SD contact at 22 miles, closing at 60 mph. Had radar indications
on the SD screen at 16 miles. Plane then turned away and did not detect us. By computing
closing speed against time, it was determined that APR-1 made contact at 47 miles. The
sky was 90% overcast and the plane was not sighted.

[STAMP: CONFIDENTIAL]
U.S.S. BOFIN (SS287) - Report of War Patrol No. Six.

— page 62 —
[STAMP: CONFIDENTIAL]
U.S.S.
Subject: FIN (SS287) - Report of War Patrol Number Six.

ENCLOSURE (A)
- 58-a

| Date | Time | Radar (cont'd) | Enemy radar transmission as detected by APR-1 receiver. |
|---|---|---|---|
| | | | Freq. | Posit | PRF | Sweep | Remarks |
| | | | (m.c.) | | Cps | Rate | |
| 7/29/44 | 0828 (K) | 290°- 43' N | 93 | 270°- 55' N | 60 | 4 rpm | SD plane contact 22 mi. |
| | | 140°- 58' E | | 130°- 51' E | | | Interference on SD screen. |
| 7/31/44 | 0935 (A) | 270°- 28' N | 81 | 270°- 59' N | 60 | 4 rpm | Continued about morning. |
| | | 130°- 26' E | | 129°- 40' E | | | 45 miles from KIKAI JIMA. |
| 8/3/44 | 2005 (I) | 270°- 59' N | 81 | 270°- 59' N | 1500 | Steady | 19 miles from KIKAI JIMA. |
| | | 129°- 40' E | | 129°- 40' E | | | |
| 8/9/44 | 2024 (I) | 25°- 57' N | 92 | 25°- 57' N | 1200 | Steady | Possibly on DAITO JIMA. |
| | | 131°- 06' E | | 131°- 06' E | | | |
| 8/14/44 | 1416 (I) | 28°- 53' N | 92 | 28°- 53' N | 60 | Steady | Plane contact 9 minutes |
| | | 130°- 13' E | | 130°- 13' E | | | later. |
| 8/15/44 | 1441 (I) | 28°- 19' N | 87 | 28°- 19' N | 60 | Steady | Plane contact 10 minutes |
| | | 128°- 01' E | | 128°- 01' E | | | later. |
| 8/15/44 | 2210 (I) | 28°- 08' N | 162 | 28°- 08' N | 1000 | Steady | Very strong. stopped |
| | | 128°- 39' E | | 128°- 39' E | | | suddenly. |
| 8/16/44 | 2222 (I) | 27°- 27' N | 162 | 27°- 27' N | 1000 | 1.5 rpm | Faded after 23 minutes. |
| | | 128°- 02' E | | 128°- 02' E | | | |
| 8/17/44 | 0500 (I) | 28°- 03' N | 155 | 28°- 03' N | 1000 | Steady | 2 planes on patrol sighted |
| | | 128°- 30' E | | 128°- 30' E | | | later. |
| 8/22/44 | 0618 (I) | 28°- 00' N | 271 | 28°- 00' N | 1200 | --- | Very strong. |
| | | 127°- 52' E | | 127°- 52' E | | | |
| 8/22/44 | 1358 (I) | 28°- 40' N | 155 | 28°- 40' N | 1000 | 1 rpm | Very strong. Planes in |
| | | 128°- 20' E | | 128°- 20' E | | | vicinity. |

— page 69 —
SUBMARINE DIVISION FORTY TWO

FB5-42/A16-3                                        Fleet Post Office
Serial ( 063 )                                      San Francisco, California
                                                    14 September 1944.

CONFIDENTIAL

FIRST ENDORSEMENT to
LOWFIN Report of Sixth
War Patrol.

From:       The Commander Submarine Division FORTY TWO.
To :        The Commander in Chief, United States Fleet.
Via :       (1) The Commander Submarine Squadron FOUR.
            (2) The Commander Submarine Force, Pacific Fleet.
            (3) The Commander in Chief, U.S. Pacific Fleet.

Subject:    U.S.S. BOWFIN (SS287) - Report of Sixth War
            Patrol - Comments on.

            1. The Sixth War Patrol of the U.S.S. BOWFIN conducted
in the Central NANSEI SHOTO area covered a period of sixty
days, thirty of which were spent in the assigned areas.

            2. Attack No. 1 - On 9 August contact made by radar a
convoy consisting of one medium sized AK and three smaller
vessels headed for MINAMI DAITO. It appeared as if the con-
voy were going alongside the dock consequently torpedo fire
was withheld until one or more ships moored to the new con-
crete dock. Range 1,750 yards, fired three bow torpedoes
during submerged daylight approach at a 1,000 ton AK lying
to off dock. The AK disintegrated when the second torpedo
hit him on the port quarter. Fire was then shifted to another
1,000 ton AK moored alongside the dock. Range 1,150 yards,
fired three bow torpedoes. All three torpedoes hit and the
resultant explosions were tremendous. When the smoke and
flying debris cleared the merchantman had disappeared and
the dock was obliterated. A large bus which was loading
personnel just prior to the explosions was a tangled mass
of wreckage.

            Attack No. 2 - This was a night surface attack
on a convoy consisting of three AP-AKs escorted by two
MIMI ZE class destroyers. This attack was exceedingly well
planned and took place in restricted waters. Range 2,800
yards, fired six bow torpedoes at two overlapping AP-AKs with
DD escort just astern. Two hits were observed in the leading
ship which broke in two and sank immediately. The second ship
was also hit by two torpedoes. Great clouds of smoke and a
fire were observed as the ship started to settle by the stern.
One torpedo hit the DD escort and it was observed to disinter-
grate instantaneously under the influence of a magazine or

                                                    -1-
[STAMP: 65]

— page 70 —
SUBMARINE DIVISION FORTY TWO

FB5-42/A16-3
Serial ( 063 )
CONFIDENTIAL

FIRST ENDORSEMENT to
BOWFIN Report of Sixth
War Patrol.

Subject: U.S.S. BOWFIN (SS287) - Report of Sixth War
           Patrol - Comments on.

Fleet Post Office,
San Francisco, California
14 September 1944.

depth charge explosion. Fired four stern tubes at remaining
AK and other DD which was just astern at ranges of 3,100
yards and 2,400 yards respectively. The destroyer disinte-
grated in an even more violent explosion than the first one and
disappeared immediately from the radar screen. One hit was
observed on the AP-AK which appeared well aft and started a
fire. Shortly after this attack the AP-AK damaged in the
first phase disappeared from the radar screen while three
muffled heavy explosions were heard. In view of the immediate
and thorough search conducted in this restricted area with no
evidence of any targets still remaining afloat, it is considered
that the entire convoy and DD escorts were sunk.

Attack No. 3 - This was a day submerged periscope
approach on a 400 ton armed trawler. Fired stern tube,
range 950 yards, torpedo set at ten feet. Torpedo missed.
Two minutes later fired another stern torpedo, range 1,000
yards, torpedo set at zero feet. Torpedo missed. One min-
ute later fired still another stern torpedo, range 1,100
yards, torpedo set at zero feet. Torpedo missed. No explan-
ation for misses can be given other than they passed under
target. The data was excellent and the target practically
stopped.

Gun Attack No. 1 - Four hours later the BOWFIN
made a Battle Surface and opened fire with all guns on the
same armed trawler of torpedo attack No. 3. Ten 4" gun hits
were made with thirty-seven shots which blew off the stern
and had the target completely enveloped in flames.

Gun Attack No. 2 - Targets consisted of one 1,000
ton AK and two 300 ton AKs. The large AK was taken under 4"
gun fire at 4,000 yards but was ineffective. As the smaller
Marus closed fire was shifted to these targets causing them
to sheer off and open the range. At this time machine gun
bullets were falling all around the BOWFIN but fortunately
no one was injured. On shifting 4" gun fire back to the large
Maru several effective hits were made which caused several
fires fore and aft. After firing last round of 4" closed
range to 500 yards and poured 20 MM and 30 caliber bullets
into his hull and along the decks. The BOWFIN pulled clear
to watch the deck gasoline drums and eight depth charges
explode.

-2-
[HANDWRITTEN: 66]

— page 71 —
SUBMARINE DIVISION FORTY TWO

FB5-12/A16-3
Serial ( 063 )
CONFIDENTIAL
FIRST ENDORSEMENT to
BOWFIN Report of Sixth
War Patrol.

Fleet Post Office
San Francisco, California
14 September 1944.

Subject: U.S.S. BOWFIN (SS287) - Report of Sixth War
         Patrol - Comments on.

Torpedo Attack No. 4 - It was decided to finish
off the burning target of Gun Attack No. 2 with one torpedo.
Three torpedoes fired singly were expended without hitting
at ranges of 500 to 600 yards. Since all three torpedoes
were fired on the surface their tracks were closely observed.
In all cases the torpedo hooked left at the beginning of the
run causing the torpedoes to miss astern.

3. The BOWFIN will return to Mare Island for overhaul.

4. It is considered that the following damage was
inflicted on the enemy:

S U N K

2 1,000 ton AKs

— page 72 —
FC5-4/A16-3

Serial 0353

CONFIDENTIAL
SUBMARINE SQUADRON FOUR 11/tel
Fleet Post Office,
San Francisco, California,
17 September 1944.

SECOND ENDORSEMENT to:
U.S.S. BOWFIN, report
of Sixth War Patrol.

From: The Commander Submarine Squadron FOUR.
To: The Commander-in-Chief, United States Fleet.
Via: (1) The Commander Submarine Force, PACIFIC FLEET.
(2) The Commander-in-Chief, U.S. PACIFIC FLEET.
Subject: U.S.S. BOWFIN (SS287), Report of Sixth War
Patrol - Comments on.

1. Forwarded, concurring in the remarks of the Command-
er Submarine Division FORTY-TWO.

2. In attack #1, the cool, deliberate attack on ships
lying at or near a valuable loading dock resulted in the complete
disintegration of the ships and devastating damage to the dock.
In addition, the resulting demolishment of a loaded personnel bus
on the dock is considered unique in submarine warfare.

3. The complete destruction of a five (5) ship convoy
(including two (2) DDs) is a superb example of a job which is be-
coming commonplace for this fighting ship.

4. This patrol of the BOWFIN is notable in its con-
tinued aggressiveness, excellent planning of attacks, and most
gratifying results.

5. The Commanding Officer, officers, and crew are
heartily congratulated on the conduct of this patrol and for
the heavy damage they inflicted on the enemy.

[SIGNATURE: C. F. Erck]
C. F. ERCK.

— page 73 —
SUBMARINE FORCE, PACIFIC FLEET hch
FF12-10/A16-3(15)
/(16) Care of Fleet Post Office,
Serial 02035 [STAMP: 28 SEP 1944] San Francisco, California,
CONFIDENTIAL 22 September 1944.
THIRD ENDORSEMENT to
BOWFIN Report of NOTE: THIS REPORT WILL BE
Sixth War Patrol. DESTROYED PRIOR TO
ENTERING PATROL AREA.
COMSUBSPAC PATROL REPORT NO. 529.
U.S.S. BOWFIN - SIXTH WAR PATROL.

From: The Commander Submarine Force, Pacific Fleet.
To : The Commander-in-Chief, United States Fleet.
Via : The Commander-in-Chief, U. S. Pacific Fleet.

Subject: U.S.S. BOWFIN (SS287) - Report of Sixth War Patrol.
(16 July to 13 September 1944).

1. The sixth war patrol of the BOWFIN was conducted in the
Central Nansei Shoto Area.

2. Expert planning and outstanding fighting spirit,
characteristic of the BOWFIN, was displayed throughout this highly
successful patrol. The first attack, which accounted for two ships,
a concrete dock at the landing on Minami Daito Jima Island, and a bus
loaded with a Japanese liberty party, is unique in submarine warfare
and was over-shadowed only by Attack No. 2, in which a complete five
ship convoy, including two destroyers, was sunk. The two aggressive
successful gun attacks were also typical of this fighting ship.

3. This patrol is designated as "Successful" for Combat
Insignia Award.

4. The Commander Submarine Force, Pacific Fleet, congratu-
lates the commanding officer, officers, and crew for another aggres-
sive and highly productive patrol, adding to the splendid record of
success established by the BOWFIN. The BOWFIN is credited with having
inflicted the following damage upon the enemy during this patrol:

S U N K
1 - Small AK (EC) - 1,000 tons (Attack No. 1)
1 - Small AK (EC) - 1,000 tons (Attack No. 1)
1 - Large AK (LIMA MARU Type) (EC) - 7,100 tons (Attack No. 2)
1 - Large AK (KOFUN MARU Type) (EC) - 6,700 tons (Attack No. 2)
1 - DD (MINEKAZE Class) (EC) - 1,300 tons (Attack No. 2)
1 - DD (MINEKAZE Class) (EC) - 1,300 tons (Attack No. 2)
1 - Large AK (NANKAI MARU Type) (EC) - 6,800 tons (Attack No. 2)
1 - SMC Trawler) (EC) - 500 tons (Gun Attack No.1)
1 - Small AK (EC) - 1,000 tons (Gun Attack No.2)

TOTAL SUNK 26,700 tons

- 1 -

— page 74 —
SUBMARINE FORCE, PACIFIC FLEET hch
FF12-10/A16-3(15)/(16)
Serial 02035
CONFIDENTIAL

THIRD ENDORSEMENT to
BOWFIN Report of
Sixth War patrol.

COMSUBSPAC PATROL REPORT NO. 529.
U.S.S. BOWFIN - SIXTH WAR PATROL.

Subject: U.S.S. BOWFIN (SS287) - Report of Sixth War Patrol.
(16 July to 13 September 1944).

— page 76 —
[HANDWRITTEN: 1ST COPY]

U. S. S. BOWFIN (SS 287)
Care of Fleet Post Office
San Francisco, California

SS/287/A16/A9

Serial 01

[STAMP: DECLASSIFIED]
[STAMP: CONFIDENTIAL (struck through)]

25 March 1945

From: The Commanding Officer, U.S.S. BOWFIN.
To: The Commander in Chief, United States Fleet.
Via: (1) The Commander Submarine Division Two Eighty Two.
     (2) The Commander Submarine Squadron Twenty Eight.
     (3) The Commander Submarine Force, Pacific Fleet.

Subject: U.S.S. BOWFIN (SS 287), Report of War Patrol Number Seven.

Enclosures: (A) Subject report.
           (B) Track Chart.

1. Enclosure (A), covering the seventh war patrol of this vessel
conducted in the Nanpo Shoto and Empire areas during the period 25 January,
1945 to 25 March, 1945 is forwarded herewith.

J. K. TYREE

[STAMP: DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C]
[HANDWRITTEN: BY GP-09R96 DATE 5/24/72]

[STAMP: DECLASSIFIED]

[HANDWRITTEN: 114169]

— page 89 —
CONFIDENTIAL
Subject: U.S.S. BOWFIN (SS 287), Report of War Patrol Number Seven
---
0545    Range closed quickly to 6500 yards. Then started to open slowly
        to 11,000 yards. Changed course to put him astern and slowed to
        9 knots to lessen our phosphorescent wake.
0547    Range started to close again. OOD sighted running lights of a
        plane headed in.
0548    With range 6150 yards, we dove. He may have been a friend, but
        we were dubious. PR had picked up a signal, approximately one
        minute before SJ contact, at 160 Mcs. and 182 Mcs. This could be
        one of our carrier planes, and we were inclined to think so,
        because we made a very slow dive and received no bombs.
0740    Surfaced on lifeguard station, force 4 sea.
1004    Sighted two planes bearing 300°T, range 12 miles, on an easterly
        course. They looked like F6F's, and were making high speed. They
        went out of sight at 1005.
1215    Sighted smoke on the horizon bearing 065°T.
1216    Went to full speed on course 065°T. Thought one of our planes
        may have crashed.
1252    Could make out two masts, and clipper bow of a picket boat, (Ship
        Contact #7), it looked like a schooner.
1300    Sighted a second target through periscope bearing 020°T on a
        northerly course (Ship Contact #8), range 6 - 7 miles. He was a
        smaller picket boat. He was already in an air-surface zone.
        Estimated we would have to run at least 20 miles into air-surface
        zone to overtake him, so let him go. Sea was too rough to man
        any guns on deck. Continued to close other target, who was just
        on edge of our joint zone.
1303    Noted that after mast had fallen over the stern. The fire and
        smoke in his stern was practically out now. SJ radar finally
        picked him up at a range of 4500 yards. C.O. had estimated the
        range to be twice that much. We guessed some carrier plane had
        set this fellow on fire by strafing, and that the other picket
        boat had taken off the crew and headed for home. Decided to give
        the 40MM and bridge 20MM crews some pointing practice and complete
        the destruction of this craft, estimated to be about 200 tons,
        length 120 feet, sea truck variety. Sea was too rough to consider
        boarding. Besides he had four depth charges on his stern, and
        fire was still smoldering there. This honest. No sign of life.
1313    Opened fire with 40MM at range about 3000 yards. Gun Attack #1.
1325    Closed to 1500 yards and commenced firing with #2 - 20MM gun.
        This was maximum effective range for the 40MM gun in this seaway.
        At times the sea would obscure the target from deck to waterline.
        Took some pictures.
1341    Closed to 400 yards and resumed fire. At this range both guns
        were making about 75% hits. Target's bow looked like a sieve from
        40MM hits, many near the waterline, but it still hadn't settled
        appreciably. Was disappointed that our incendiary ammunition
        didn't create more fire in him, but he must have been too water-
        soaked from the seas breaking over him. Little apparent change
        in trim.

- 13 -
ENCLOSURE (A)

— page 95 —
CONFIDENTIAL
Subject: U.S.S. BOTIN (SS 287), Report of War Patrol Number Seven.

1810 Secured from battle stations and headed out to open range when
     he set course 315°T for MIK.YE SHIM. at 3.2 knots. He never
     heard his screws, even at 800 yards. Decided not to battle
     surface on him or gun him after dark due to the near proximity
     of MIKUR. SHIM. He was keeping a suspiciously poor lookout.
1908 Surf. Set course for area just south of IRO SAKI.
2300 Received notification of lifeguard assignment for B-29 raid.
     Decided to proceed to station west of KOZU SHIMA and NII SHIMA.
     for submerged patrol tomorrow, and hope for a target proceeding
     down the fairway out of SAGAMI N.D. We have a long run to our
     new lifeguard station.

1 March 1945

1200 Position

Lat. - 34-22.7 N
Long. - 138-44.0 E

0237 Indications of another SJ radar bearing 330°T.
0322 SJ contact at 000°T, range 11,000 yards. He is a friendly sub-
     marine judging by radar indications. Unsuccessfully at-
     tempted to exchange signals. Lost contact at 0349.
0405 SJ contact at 074°T, range 11,700 yards. Unsuccessfully at-
     tempted to exchange signals. Lost contact at 0408.
0440 APR had a 156 M.C. contact which checked with the reported Jap
     submarine radar.
0452 Indications of other SJ radar bearing 110°T. He steadied on us
     at 0511, but no signals.
0514-0550 Swinging ship, having decided to give the BATFISH method a try.
0554 Set course 135°T, having decided that APR gave strongest indica-
     tions of 156 M.C. radar on that heading.
0608 SJ radar contact bearing 056°T at 11,600 yards. Manned radar
     tracking party and changed course to close at full speed. He
     was using radar whose indications on a scope looked like SJ to
     our technician. C.O. was not convinced. He steadied on us
     occasionally, but no signals, and was operating his radar inter-
     mittently. Decided to work around him to westward if possible.
     He was tracking at 14 knots, first on course 030°, then 010°,
     then 330°.
0642 SJ lost all contact, and OOD who had sighted target at 0638
     reported he could no longer see him. APR reported the 156 M.C.
     contact had disappeared, though he still had one at 155 M.C.
     which he had picked up at approximately the same time two hours
     before.
0643 Dove for days submerged patrol.
1910 Surfaced.

- 19 -
ENCLOSURE ( )

— page 98 —
- 22 - ENCLOSURE (A)

CONFIDENTIAL

Subject: U.S.S. BOWFIN (SS 287), Report of War Patrol Number Seven.

— page 109 —
m CONFIDENTIAL
Subject: U.S.S. BOWFIN (SS 287), Report of War Patrol Number Seven.

0750 SD contact at 3 miles. Dove.
0804 Surfaced.
0920 SD contact at 34 miles. Received IFF return. Contact closed
 to 2 miles then opened. Not sighted. He must have been flying
 at 10,000 feet.
1532 SD contact at 19 miles. Received IFF return. Lost contact at
 40 miles at 1540.
2345 Commenced 6-hour battery discharge.

24 March 1945

1200 Position

 Lat. - 16-14.0 N
 Long. - 140-38.2 E

0301 Indications of a friendly submarine on SJ radar bearing 255°T.
0320 Exchanged recognition signals and calls with SPRINGER.
0613 Completed battery discharge. Secured on reaching L.V.L. on
 cell #63, after battery, 100.3% capacity.

 Several contacts with friendly planes during the afternoon.

2102 Exchanged recognition signals and calls with SPRINGER.

25 March 1945

0600 Rendezvous with escort, DE 25, and with CREVALLE, SPRINGER, and
 TREPANG.
0930 Moored - GUAM.

- 33 - ENCLOSURE (A)

— page 111 —
[HANDWRITTEN: 35]
ENCLOSURE (A)

| No. (F) | Time | Date | Lat. | Long. | Type | Initial Range | Approx. How Contact- Course | Speed | Remarks |
|---|
| 1. | 2022 (K) | 8 Feb. | 16-44N | 146-41E | Unknown | 11050 | 000°T | 0K | Believed to be friendly radar picket vessel at 8,000 yards. Believed friendly. |
| 2. | 2056 (K) | 8 Feb. | 16-42N | 146-35E | DE or DD | 15160 | 315°T | 18K | Had SJ radar - Probably westbound BILL. |
| 3. | 2337 (K) | 8 Feb. | 16-59N | 147-29E | U.S. Submarine | 9200 | 090°T | R | USS PARCHE - Exchanged calls. Eastbound. |
| 4. | 2010 (K) | 11 Feb. | 28-39N | 146-05.1E | Submarine | 7150 | --- | R | Probably patrol or fishing. boat. |
| 5. | 1940 (K) | 14 Feb. | 33-23N | 139-30E | Unknown | 12000 | 000-020 | 15K | See attack No. 1. |
| 6. | 2321 (K) | 16 Feb. | 33-23N | 139-43.4E | Two DD of un- known class | 12000 | 000°T | 15K | See attack No. 1. |
| 7. | 1252 (K) | 17 Feb. | 33-30N | 140-30E | Picket Boat | 12-14000 | 300°T | 12K | Sea Truck - Burning and abandoned. |
| 8. | 1300 (K) | 17 Feb. | 33-18N | 140-30E | Picket Boat | --- | Per | Per | On Lifeguard station during strike. |
| 9. | 0638 (K) | 24 Feb. | 36-14N | 141-41E | Sampan or Patrol boat | 8000 | 040°T | 0-2.5K | About 75 tons Picket boat. Sea very rough. |
| 10. | 1549 (K) | 28 Feb. | 33-30N | 139-04E | Large Sea Truck | 8750 | 355°T | 10K | See attack No. 2. |
| 11. | 0237 (K) | 2 Mar | 33-04N | 139-20E | Truck | 8750 | 135°T | 3K | 2 Picket boats or station - Well armed and tough. |
| 12. | 0850 (K) | 4 Mar. | 31-53.5N | 141-21.9E | Two Picket boats | 11,000 | 270°T | 5K | Same as No. 12 - Lying to later. |
| 13. | 1900 (K) | 9 Mar. | 32-19.5N | 141-01.8E | Two Picket boats | 11,000 | --- | R | Same as No. 12 - Lying to later. |

CONFIDENTIAL
Subject: U.S.S. BOWFIN (SS 287), Report of War Patrol Number Seven.

— page 112 —
- 36 -
ENCLOSURE (A)

| No. | Time | Lat. | Long. | Type | Initial | Approx. | How | Remarks |
|---|---|---|---|---|---|---|---|---|
| | Date | | | | Range | Course | Contact- | |
| | | | | | | Speed | ed | |
| 14. | 0728 (K) | 32-44.6N | | Two DD | 18,000 | 045 | Per | Two U.S. Destroyers |
| | 19 Mar. | 133-36 E | | | | | | |
| 15. | 0810 (K) | 32-40 N | | Two DD | 19,000 | | Per | Two U.S. Destroyers |
| | 19 Mar. | 133-30 E | | | | | | |

(G)
AIRCRAFT CONTACTS
The absolute lack of enemy air contacts is
noteworthy. In view of the air fields located on the northeast of INUBO SAKI, we had no enemy air contact in the vicinity of H.CHIJO is considered. In three days spent on the surface neutralizing air fields in the TOKYO area.
Our first definite contact with enemy radar equipped search planes occurred night of 17-18 March, south of SHIKOKU, approaching KII SUIDO. One plane keyed his arch, and on one occasion, he got in relatively close undetected, using this irregular intervals, and on one occasion, he got in during the following three days, we system. We were glad that it was a dark night. Our aircraft contacts, undoubtedly, our stay in this area would have been more unpleasant but for the carrier strikes on the Inland Sea. The IPR is an invaluable protection.

[STAMP: CONFIDENTIAL]
Subjects:
U.S.S. BO
[HANDWRITTEN: (SS 287),] Report of Seventh
Patrol.

— page 113 —
```json
{
  "text_content": "CONFIDENTIAL\nSubject:\nU.S.S. BOFFIN (SS 287), Report of War Patrol Number Seven.\nTORPEDO ATTACK REPORT\nU.S.S. BOFFIN\nTORPEDO ATTACK NO. 1\nPATROL NO. 7\nTime 0056 (K)\nDate 17 February, 1945 Lst. 33-53.2N Long. 139-45.0E\nTARGET DATA - DAMAGE INFLICTED\nDescription:\nTarget was one of two destroyers in company, contacted by SJ\nradar. Both were echo-ranging at 18 K.C. Exact identification\nwas impossible on the dark night with visibility varying be-\ntween 2000 and 4000 yards due to intermittent rain squalls.\nBridge structure was bulky; no break in the deck forward of\nforemast could be detected and foremast believed to be a\nlight tripod.\nShip(s) Sunk:\nOne destroyer of unknown class, estimated to be HATSUHARU\nclass., 1400 tons. (EU).\nShip(s) Damaged\nor Probably Sunk: None\nDamage Deter-\nmined by:\nSaw explosion amidships. Radar pip gradually decreased in\nsize. Plot and T.D.C. tracked target at speed zero

— page 117 —
CONFIDENTIAL
Subject: U.S.S. BOWFIN (SS 287), Report of War Patrol Number Seven.

(d) Due to the fact that this was a difficult and an alert
    target, we should have reloaded forward before attacking
    and fired a full tube nest with a smaller spread between
    torpedoes. The intended spread was 200' between torpedoes
    and the actual spread was slightly greater. It is believed
    that the torpedo which prematurely was the second torpedo
    aimed at the M.O.T. and that two torpedoes missed ahead
    and astern because of excessive spread. Target's maneu-
    vers after the premature could not be accurately determined.

GUN ATTACK REPORT

GUN ATTACK NO. 1

U.S.S. BOWFIN Date 17 February 1945 Lat. 33-11.5N Long. 140-46.0E
Time 1313

TARGET D.T. - DAMAGE INFLICTED

Sunk One derelict sea truck of about 200 tons and 120ft. length.

Damage or
Probably sunk

Damage deter-
mined by Target observed to roll over and sink.

DETAILS OF ACTION

Sank abandoned sea truck by blowing up depth charges on stern with 20MM hit.
Target was burning when contacted, probably the result of strafing. Many hits
of all types inflicted, about six previous 20MM hits failed to explode depth
charges. Incendiaries failed to start fires.

TYPE GUNS                               ROUNDS FIRED    TYPE AMMUNITION
One 40MM (Single mount, Army type, M-1) 161             16 H.E.T.
                                                        48 A.P.
                                                        97 H.E.I.T.

Two 20MM (Mk. 4)                        800             266 H.E.T.
                                                        534 H.E.

- 41 -                                                  ENCLOSURE (L)

— page 127 —
- 51 - ENCLOSURE (A)

CONFIDENTIAL
Subject: U.S.S. BOWFIN (SS 287), Report of War Patrol Number Seven.

— page 132 —
COMMANDER SUBMARINE DIVISION TWO EIGHTY TWO.
Care of Fleet Post Office
San Francisco, California.

27 March 1945.

FB5/282/A16-3
Serial (013)

CONFIDENTIAL

FIRST ENDORSEMENT to
CO BOWFIN Conf. Ltr. SS287/
A16-3/A9 Serial 01 of 25
March 1945.

From: The Commander Submarine Division TWO EIGHTY TWO.
To : The Commander in Chief, United States Fleet.
Via : The Commander Submarine Squadron TWENTY EIGHT.
The Commander Submarine Force, Pacific Fleet.
The Commander in Chief, United States, Pacific Fleet.

Subject: U.S.S. BOWFIN (SS 287) , Report of War Patrol Number
Seven.

1. The Seventh War Patrol of the Bowfin, and the first
for her Commanding Officer as such, was conducted in the areas
south and east of Honshu. It extended over a period of fifty-
seven days, thirty-seven of which were spent on station and was
terminated by the provisions of her operations order as modified
by dispatch. Most of the patrol was dedicated to life-guard duties
for both carrier planes and B-29 strikes and Bowfin was rewarded
in being able to rescue Lieutenant R. U. Plant, USNR and Papazog-
lakis, J. AMM3c of Torpedo Squadron 83. It is felt that Bowfin
did an outstanding job of life-guarding and the Commanding Officer
showed courage and a fine appreciation of the situation in his
choice of surface and submerged running. It was not long ago that
submarines operating in this same area found it necessary to remain
submerged from daylight to dark every day yet Bowfin spent only
four of her thirty-seven days on station submerged.

2. In spite of a fairly full calendar of life-guard duties
time was found for three aggressive torpedo attacks and two gun
attacks. The first torpedo attack was made on one of two destroyers
in company from excellent position: Track angle 109°S, torpedo run,
1800 yards. Three torpedoes were fired; the center one of the
spread hit and sank the target. The second attack was conducted on
the remaining destroyer an hour and a half later again from an ex-
cellent position but it was marred by a premature of the torpedo
fired at the middle of the target and no hits resulted.

-1-

— page 133 —
FB5/282/A16-3
Serial (013)

CONFIDENTIAL

FIRST ENDORSEMENT to
CO BOWFIN Conf. Ltr. SS287/
A16-3/A9 Serial 01 of 25
March 1945.

Subject: U.S.S. BOWFIN (SS 287) , Report of War Patrol Number
Seven.

COMMANDER SUBMARINE DIVISION TWO EIGHTY TWO
Care of Fleet Post Office
San Francisco, California.

27 March 1945.

Subject: U.S.S. BOWFIN (SS 287) , Report of War Patrol Number
Seven.

— page 134 —
FC5-28/A16-3

Serial No. 084.

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

SECOND ENDORSEMENT to
CO, U.S.S. BOWFIN Conf. Ltr.
A16-3/A9 Serial 01 of 25
March 1945.

From: The Commander Submarine Squadron TWENTY-EIGHT.
To : The Commander-in-Chief, United States Fleet.
Via : (1) The Commander Submarine Force, Pacific Fleet.
(2) The Commander in Chief, United States, Pacific Fleet.

Subject: U.S.S. BOWFIN (SS287), Report of War Patrol Number SEVEN.

1. Forwarded, concurring in the remarks of the Commander Submarine
Division Two Eighty Two.

2. The Commander Submarine Squadron TWENTY-EIGHT congratulates the
Commanding Officer, officers and crew on the successful completion of the
BOWFIN'S Seventh war patrol, during which the following damage is considered
to have been inflicted upon the enemy:

SUNK

1 DD (Estimated to be HATSUHARU class) EU 1400 tons (Torpedo Attack No. 1)
1 Sea Truck (EC) 900 tons (Torpedo Attack No. 3)
1 Picket Boat (Abandoned. Previously (EC) 200 tons (Gun Attack No. 1)
damaged by carrier
planes)

DAMAGED

1 Picket Boat 250 tons (Gun Attack No. 2)

J. M. WILL.
[SIGNATURE: J. M. WILL]

SUBMARINE SQUADRON TWENTY-EIGHT

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

— page 135 —
[STAMP: 4 01573] Ga
FF12-10(A)/A16-3(18) SUBMARINE FORCE, PACIFIC FLEET

Serial 0702                               Care of Fleet Post Office,
                                          San Francisco, California,
CONFIDENTIAL                              3 April 1945.

THIRD ENDORSEMENT to                      NOTE: THIS REPORT WILL BE
BOWFIN Report of                                DESTROYED PRIOR TO
Seventh War Patrol.                             ENTERING PATROL AREA.

COMSUBSPAC PATROL REPORT NO. 705
U.S.S. BOWFIN - SEVENTH WAR PATROL.

From:         The Commander Submarine Force, Pacific Fleet.
To :          The Commander in Chief, United States Fleet.
Via :         The Commander in Chief, U.S. Pacific Fleet.

Subject:      U.S.S. BOWFIN (SS287) - Report of Seventh War Patrol
              (25 January to 25 March 1945).

              1. The seventh war patrol of the BOWFIN, under the command
of Commander A. K. Tyree, U.S. Navy, was conducted in the NANPO SHOTO
and EMPIRE areas. The BOWFIN performed lifeguard duties as well as
offensive patrol.

              2. This aggressive, smartly conducted patrol was in keeping
with the well established outstanding record of this fighting ship. A
great portion of the patrol was devoted to lifeguard duties, and the
BOWFIN had the honor of rescuing two downed friendly aviators. In
addition, three aggressive well planned torpedo attacks were delivered,
and two gun attacks were made. Unfortunately, on attack No. 2 a pre-
mature torpedo explosion cost the BOWFIN another destroyer, she having
already sunk one on the first attack.

              3. Award of Submarine Combat Insignia for this patrol
is authorized.

              4. Commander Submarine Force, Pacific Fleet, congratulates
the commanding officer, officers, and crew of the BOWFIN for another
splendid patrol added to this ship's long illustrious record. The
BOWFIN is credited with having inflicted the following damage upon the
enemy during this patrol:

                                S U N K

1 - DD (HATSUHARU Type) (EC)         -     1,400 tons (Attack No. 1)
1 - SMC (Seatruck) (EC)              -     1,200 tons (Attack No. 3)
*1/2 - MIS (Picket Boat) (EC)        -       100 tons (Gun Attack No. 1)
                                     ---
TOTAL SUNK                           -     2,700 tons

                                - 1 -

[STAMP: EXTRA - ORIGINAL
SORG. MICRO
PHOTO-LAB OP-16
RETURN TO F-4253]

— page 138 —
[HANDWRITTEN: 1ST COPY]
[STAMP: DECLASSIFIED]
CON
SS28-16/49

Serial Oil

From:
To:
Via:
(1)
(2)
(3)

Subject:

Enclosures:
(A)
(B)

1.
conducted in the areas east of HONSHU and south of HOKKAIDO during the period
23 April, 1945 to 15 May, 1945, is forwarded herewith.

DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
BY [HANDWRITTEN: OP-09B2C] DATE [HANDWRITTEN: 5/24/72] U. S. S. BOFFIN (SS 287)
Care of Fleet Post Office
San Francisco, California

The Commanding Officer.
The Commander in Chief, United States Fleet.
The Commander Submarine Division TWO EIGHTY TWO.
The Commander Submarine Squadron EIGHTY EIGHT.
The Commander Submarine Force, Pacific Fleet.

U. S. S. BOFFIN (SS 287), Report of War Patrol Number Eight.

Subject Report.
Track Chart.

Enclosure (A), covering the Eighth War Patrol of this vessel

15 May 1945

[SIGNATURE: A. K. TYRES]

[STAMP: DECLASSIFIED]

[STAMP: 123261 FILMED]
[HANDWRITTEN: 870]
[HANDWRITTEN: 1]

— page 149 —
CONFIDENTIAL
Subject: U.S.S. BOOFIN (SS 287) -- Report of EIGHTH W.R. PATROL.

0418 tanker. Gave order to check fire and shift to the far target.
     Commenced firing aft. Tube 7 went out aimed at the tanker, but 8,9,
     and 10 were fired at the freighter. However, just before #10 was fired
     freighter was observed to have turned away, heading for the beach.
     Summary of results: Three torpedo hits were heard within a period
     of eleven seconds. Two of these were definitely on the tanker. The
     tanker was observed to disintegrate and disappear in the pall of
     black smoke which followed the flare-up of the first hit. He was
     never again sighted from the bridge and radar reported his pip had
     disappeared at 0421 at a range of about 2000 yards. A loud ex-
     plosion at 0422 was possibly a hit from tube 7 on the tanker as he
     passed 30 feet going down, but more probably an internal explosion
     from the tanker, since time does not check. Evidence on the freighter
     is not conclusive, but one hit from the first salvo is claimed. The
     port lookout, who had his binoculars on the freighter, stated that he
     saw a hit in the bow of the freighter, indicated by black smoke
     rising, a few seconds before he heard the loud explosion and turned
     to look at the tanker. He reported a hit in the bow of the freighter
     to the O.O.D. at this time. One of the three hits heard at this
     time could have been in the freighter; however, the torpedo would
     have had to run at 30 knots for correct timing, or target course
     have been fifteen degrees to left. An indication that target was
     probably damaged was that he faded out on radar at 13,500 yards,
     when he was still two miles from the beach.
0420 Secured tubes and pulled clear at full speed in the dawn light.
0442 Dove, doubting the wisdom of staying on the surface any longer. We
     were most fortunate that the Japs neglected to escort these ships
     this morning. It was amazing that we weren't sighted before firing.
0457 Completed reload. Running at 150 feet to get a badly needed rest.
1030 Two distant explosions, twelve seconds apart, which may have been
     torpedo hits. Hope the CRO got in again, and that she is not taking
     the dirty work for us.
1034 Two depth charges. Distant.
1043 Two depth charges. Distant.
1044 Three depth charges. Distant.
1051 One distant explosion.
1113 Two distant explosions.
1114 One distant explosion.
1119 Two distant explosions.
1133 Two distant explosions.
1156 Three distant explosions. At periscope depth, nothing in sight.
1200 Two distant explosions.
     Commenced normal periscope patrol. Heard 19 more depth charges at
     intervals during afternoon.
2000 Surfaced. Visibility decreasing fast due to fog. By 2100, visibil-
     ity had decreased to 500 yards. Abandoned plan to patrol north of
     TODO SAKI for tomorrow, and decided to patrol about 20 miles south.

- 11 -
ENCLOSURE (..)

— page 154 —
(F) No. | Time Date | Contact's Lat. Long. | Type | Initial Range | Appx. Course | How Contacted | Remarks
---|---|---|---|---|---|---|---
1 | 23 April | 40°-17.2'N | Unknown | 28,800 | Unknown | R | Probably Friendly Surface Ship
| 2257(K) | 143°-47.6'E | | | | |
2 | 25 April | 39°-42.2'N | Hospital Ship | 21,000 | 120° | S | Probably Friendly Hospital Ship
| 1915(K) | 139°-41.0'E | | | | |
3 | 1 May | 41°-08.0'N | 1 Medium Freighter | 17,000 | 255° | S | Carrying Oil or Gasoline
| 0420(K) | 140°-37.0'E | 1 Escort | | | | |
4 | 2 May | 41°-20.5'N | 150 Ft Trawler | 9,000 | 130° | P | Probably Fishing Boat
| 1742(K) | 141°-50.8'E | | | | |
5 | 4 May | 41°-19.0'N | Sampan | 4,000 | 345° | P | Fishing Vessel
| 0740(K) | 141°-56.5'E | | | | |
6 | 7 May | 41°-19.0'N | Patrol Boat | 13,000 | 160° | R | Probably Patrol Boat
| 0412(K) | 141°-28.0'E | | | | |
7 | 7 May | 41°-17.0'N | MMF Freighter | 12,000 | 180° | P | Hugging Coast
| 0951(K) | 141°-28.0'E | | | | |
8 | 7 May | 41°-17.0'N | 1 Medium Tanker | 14,000 | 180° | P | Hugging Coast
| 1303(K) | 141°-27.2'E | 1 Med. Freighter | | | | | I S.C. Escort
| | | | | | | | [HANDWRITTEN: with one SC for]
| | | | | | | | [HANDWRITTEN: escort and 1 JAKE]
9 | 7 May | 41°-15.5'N | Large Freighter | 14,000 | 000° | P | S.C. Escort
| 1440(K) | 141°-26.5'E | | | | | |
10 | 9 May | 39°-24.0'N | Unknown | 6,600 | Lying to | R | Avoided
| 0042(K) | 142°-1.5'E | | | | | |
11 | 9 May | 39°-20.0'N | Small Freighter | 8,000 | 000° | P | Hugging Coast
| 0116(K) | 142°-09.0'E | | | | | |
12 | 9 May | 39°-13.0'N | 1 WAKATAKE DD | 10,000 | 0100 | P | Pinging on 17.5 and 18.0 kcs.
| 1513(K) | 141°-59.0'E | 1 SCS Escort | | | | |
13 | 9 May | 39°-06.0'N | 1 SCS Escort | 10,000 | 0100 | P | Zigzagging and hugging coast
| 1753(K) | 141°-57.0'E | | | | | |

-16-
ENCLOSURE (A)

— page 156 —
CONFIDENTIAL
Subject: U.S.S. BO FIN (SS 287) -- Report of EIGHTH PATROL.

ATTACK #1

Tubes Fired             No. 7   | No. 8   | No. 9   | No. 10  | No. ____
Track Angle             101 P   | 111 P   | 105 P   | 146 P
Gyro Angle              173.5   | 163.5   | 169.5   | 158.4
Depth Set               10'     | 10'     | 10'     | 10'
Speed Used
  in TDC                27.1    | 27.1    | 27.1    | 27.1
Hit or miss             Hit     | Hit     | Miss    | Miss
Erratic
  (yes or no)           No      | No      | No      | No
Mark Torpedo            18-1    | 18-1    | 18-2    | 18-2
Serial No.              56789   | 56508   | 58109   | 57857
Mark Exploder           8-5     | 8-5     | 8-5     | 8-5
Serial No.              10525   | 9922    | 9095    | 9829
Actuation Set           Contact | Contact | Contact | Contact
Actuation Actual        Contact | Contact | -       | -
Mark Warhead            18-2    | 18-2    | 18-2    | 18-2
Serial No.              4448    | 4390    | 2694    | 3395
Explosive               TPX     | TPX     | TPX     | TPX
Firing Interval         -       | 0-10    | 0-10    | 0-10
Type Spread             2¼R     | 2¼L     | 6 3/4R  | 6 3/4L
Sea Conditions          Long rolling swells about 3 feet high.
Overhaul Activity       U.S.S. APOLLO.

Remarks - (Include details of each erratic performance of torpedoes, tubes, and
          fire control system and reason for misses, if known).

  Enter for each torpedo fired.
% Enter whether set for contact and magnetic or only contact actuation when applica-
  ble and on next line, your best estimate of type actuations actually resulting.
    (a) #7    57 sec. running time 865 yds.
    (b) #8    59 sec. running time 910 yds.
    (c) Used 27.5 kts. in computing torpedo run. Periscope estimated range
        to target to be 735 yds for first shot.
    (d) 35° temperature of injection.
    (e) Electrolyte temperature (est.) - 40°F.

                                  - 18 -
ENCLOSURE (L)

— page 158 —
C O N F I D E N T I A L
Subject: U.S.S. BO/FIN (SS 287) - Report of EIGHTH [UNCLEAR: P.ATROL].

(Torpedo Attack Report Form)

TORPEDO ATTACK NO. 2-B
[UNCLEAR: P.ATRON] NUMBER 8
U.S.S. BO FIN
Time 0415 (K) DATE May 8, 1945 Lat. 39-37.5 N Long. 142-07.7 E

TARGET DATA - DAMAGE INFLICTED

Description Unidentified medium tanker, estimated length 400 feet by
binocular. Target was heavily loaded. One high stick mast
all the way forward on raised forecastle, another high stick
mast aft with bridge and funnel abaft bridge. Never observed
to smoke.

Ship(s) Sunk One medium tanker, unidentified class (EU).

Ship(s) Damaged
or Probably Sunk None

Damage Deter-
mined by Observed two torpedo hits from bridge. Target disintegrated
almost immediately. Only a pall of black smoke could be seen
from bridge thereafter. Radar reported target pip completely
disappeared from screen at range about 2000 yards.

Target Draft 20' Course 190 Speed 8 Range 1650 (at firing)

Own Ship Data

Speed 5 Course 300 Depth Surface Angle - (at firing)

Fire Control and Torpedo Data

Type Attack A continuation of attack 2-A. Shifted targets after firing
four bow tubes at far target and fired last two bow tubes at
this nearer target with no spread. Using radar ranges and
T.B.T. bearings.

- 20 - ENCLOSURE (..)

— page 171 —
CONFIDENTIAL
DATE/TIME | POSITION | FREQUENCY | P.R.F. | PULSE WIDTH | REMARKS
4/30/45 1205 | 39-09 142-47 | 153 | 1000 | 1 | Keyed for 1½ 50% saturated.
4/30/45 2345 | 40-48 143-47 | 150 | 500 | 12 | Apparently, sweep.
4/30/45 2345 | 40-48 143-47 | 150 | 500 | 12 | Possibly airborne - short, irregular sweep.
5/2/45 0605 | 41-09 141-46 | 78 | 1000 | 17 | Regular, slow sweep.
5/2/45 1945 | 41-19 142-10 | 150 | 500 | 13 | Heard strongly, land based.
5/3/45 0200 | 41-05 142-24 | 79 | ? | ? | Very weak, audible only.
5/3/45 0730 | 41-20 142-08 | 108 | 500 | 12 | Weak, sweeping.
5/3/45 2045 | 41-12.2 142-17.5 | 148 | 500 | 12 | Sweeping radar, 3/4 saturation. Pulse
  width was constantly varied 3 to 4
  microseconds in length.
5/3/45 2045 | 41-12.2 142-17.5 | 148 | 500 | 12 | Weak, sweeping radar.
5/4/45 0405 | 41-24 141-48 | 79 | 500 | 15 | Normal, steady 10cps. pulse with unusual
  frequency appeared to be
  heard above 500 prf.
  contact heard on surfacing.
5/5/45 2000 | 42-00 141-51 | 60 | 500 | 15 | Unsteady - frequency
  lower than 60 mcgs.
5/5/45 2000 | 42-00 141-51 | 150 | 500 | 15 | Steady strong contact heard on
  surfacing.

- 33 -
ENCLOSURE (A)

— page 172 —
CONFIDENTIAL
DATE/TIME | POSITION | FREQUENCY | P.R.F. | PULSE WIDTH | REMARKS
5/5/45 | 42-00 | 80-100 | ? | ? | Intermittent in this position.
2000 | 141-51 | | | | Interwoven voice waves such as
| | | | | voice transmission produced by
| | | | | this also appeared on SJ scope.
| | | | | Possible, but doubtful jamming.
5/5/45 | 42-00 | 78 | 500 | 12 | Weak
2015 | 141-51 | | | |
5/5/45 | 42-00 | 98 | 500 | 12 | Weak
2200 | 141-51 | | | |
5/5/45 | 42-00 | 200 | 500 | [HANDWRITTEN: Wide] | Weak, steady
2215 | 141-51 | | | |
5/9/45 | 39-27 | 153 | 500 | 10 | Weak, sweeping every 25 seconds.
0125 | 142-14 | | | | Had SJ contact on small picket
| | | | | boat at this time.

Note: [HANDWRITTEN: all times King]

ENCLOSURE (A)
- 34 -

— page 174 —
FB5/282/A16-3
Serial (240)
CONFIDENTIAL

SUBMARINE DIVISION TWO EIGHTY TWO
CARE OF FLEET POST OFFICE
San Francisco, California.

16 May 1945.

FIRST ENDORSEMENT to
CO BOWFIN war patrol
number Eight SS287/A16/A9
Serial 011 of 15 May 1945.

From: The Commander Submarine Division TWO EIGHTY TWO.
To : The Commander in Chief, United States Fleet.
Via : The Commander Submarine Squadron TWENTY EIGHT.
The Commander Submarine Force, Pacific Fleet.

Subject: U.S.S. BOWFIN (SS287), Report of War Patrol Number
Eight.

1. The Eighth War Patrol of the Bowfin was conducted
in the areas east of HONSHU and south of KOKKAIDO. It extended over
a period of twenty-three days, ten of which were spent on station.
The patrol was terminated by provisions of the Operation Order.

2. Close coverage of coastal shipping routes resulted
in numerous contacts during this short and extremely aggressive
patrol. All suitable torpedo targets which could be closed were
vigorously and skillfully attacked.

TORPEDO ATTACK NO.1 was made on a BATAVIA MARU type
tanker accompanied by a PC type escort. This day periscope attack
was made after course, speed and zigzag plan had been accurately
determined by surface radar tracking. Excellent attack position was
reached in spite of long deep swells which made periscope work dif-
ficult. Four torpedoes with ten foot depth setting were fired from
the stern tubes on an average track angle of 108 port, average gyro
angle 166, torpedo run 865 yards. Two properly timed hits were
heard, and the target was seen to sink five minutes later in the
midst of a spectacular oil or gasoline fire.

-1-

— page 175 —
FB5/282/A16-3

Serial (240)

C-O-N-F-I-D-E-N-T-I-A-L
FIRST ENDORSEMENT to
CO BOWFIN war patrol
number Eight SS287/A16/A9
Serial 011 of 15 May 1945.

Subject: U.S.S. BOWFIN (SS287), Report of War Patrol Number
Eight.

SUBMARINE DIVISION TWO EIGHTY TWO
C.R.S. OF FLEET POST OFFICE
San Francisco, California

16 May 1945.

— page 176 —
FC5-28/A16-3
Serial No. 0139.

SUBMARINE SQUADRON TWENTY-EIGHT

Care of Fleet Post Office,
San Francisco, California.
18 May 1945.

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

SECOND ENDORSEMENT to
CO, BOWFIN war patrol
number EIGHT SS287/A16/A9
Serial No. 011 of 5/15/45.

From: The Commander Submarine Squadron TWENTY-EIGHT.
To : The Commander-in-Chief, United States Fleet.
Via : (1) The Commander Submarine Force, Pacific Fleet.
(2) The Commander-in-Chief, United States Pacific Fleet.

Subject: U.S.S. BOWFIN (SS287), Report of War Patrol Number EIGHT.

1. Forwarded concurring in the remarks of Commander Submarine
Division TWO HUNDRED EIGHTY-TWO.

2. The Squadron Commander most heartily congratulates the commanding
officer, officers and crew of the BOWFIN on the successful completion of this
aggressive and hazardous patrol.

3. It is recommended that BOWFIN be credited with the following:

SUNK
1 AK Batavia Maru Class (EU) 4000 Tons Torp. Attack No. 1
1 Medium AO (EU) 5000 Tons Torp. Attacks No's 2 & 3

                                 9000 Tons

DAMAGED
1 Medium AK (EU) 4000 Tons Torp. Attack No. 2A.
Total Sunk and Damaged 13000 Tons

[SIGNATURE: J. M. WILL.]
J. M. WILL.

— page 177 —
FF12-10(A)/A16-3(18) SUBMARINE FORCE, PACIFIC FLEET ld
Serial 01229 Care of Fleet Post Office,
San Francisco, California,
25 May 1945.

CONFIDENTIAL

THIRD ENDORSEMENT to NOTE: THIS REPORT WILL BE
BOWFIN Report of DESTROYED PRIOR TO
Eighth War Patrol. ENTERING PATROL AREA.

COMSUBSPAC PATROL REPORT NO. 765
U.S.S. BOWFIN - EIGHTH WAR PATROL.

From: The Commander Submarine Force, Pacific Fleet.
To : The Commander in Chief, United States Fleet.
Via : The Commander in Chief, U.S. Pacific Fleet.

Subject: U.S.S. BOWFIN (SS287) - Report of Eighth War Patrol
(23 April to 15 May 1945).

1. The eighth war patrol of the BOWFIN, under the command
of Commander A.K. Tyree, U.S. Navy, was conducted in the areas off
Honshu and Hokkaido.

2. During this patrol six contacts worthy of torpedo
fire were encountered. Traffic in these areas mostly hugged the
coast. Three excellent attacks were made, resulting in the sinking
of a medium tanker and a medium freighter, and in the damaging of
another freighter. The patrol was well conducted and area coverage
was thorough. A special mission, covered by separate report, was
carried out.

3. Award of Submarine Combat Insignia for this patrol
is authorized.

4. The Commander Submarine Force, Pacific Fleet, congra-
tulates the commanding officer, officers, and crew of the BOWFIN for
the completion of this successful patrol, and for inflicting the fol-
lowing damage upon the enemy:

S U N K

1 - Medium AK (similar to BATAVIA MARU)(EU) - 4,300 tons (Attack No.1)
1 - Medium AO (UN) - 5,000 tons (Attack No.
2B)
TOTAL SUNK - 9,300 tons

D A M A G E D

1 - Medium AK (EU) - 4,000 tons (Attack No.
2A)
TOTAL SUNK & DAMAGED - 13,300 tons

Distribution and authentication
on following page. - 1 - MERRILL COMSTOCK.

— page 178 —
FF12-10(A)/A16-3(18) SUBMARINE FORCE, PACIFIC FLEET
Serial 01229

CONFIDENTIAL

THIRD ENDORSEMENT to
BOWFIN Report of
Eighth War Patrol.

COMSUBSPAC PATROL REPORT NO. 765
U.S.S. BOWFIN - EIGHTH WAR PATROL.

Subject: U.S.S. BOWFIN (SS287) - Report of Eighth War Patrol
(23 April to 15 May 1945).

— page 180 —
[STAMP: DECLASSIFIED]
U. S. S. BOFIN (SS 287)
Care of Fleet Post Ofc.
San Francisco, Calif.

SS287/A16/A9

Serial 020

From: The Commanding Officer, U. S. S. BOFIN.
To: The Commander in Chief, United States Fleet.
Via: (1) The Commander Submarine Division One Hundred Four.
     (2) The Commander Submarine Squadron Ten.
     (3) The Commander Submarine Force, Pacific Fleet.

Subject: U.S.S. BOFIN (SS 287), Report of War Patrol Number Nine.

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

1. Enclosure (A), covering the ninth war patrol of this vessel con-
ducted in the JAPAN SEA during the period 29 May, 1945 to 4 July, 1945 is
forwarded herewith.

[STAMP: DECLASSIFIED - DOD DIR. 5200.9]
[STAMP: of 27 Sep 58]
[STAMP: BY Q2C] [HANDWRITTEN: DATE 4/16/73]

4 July, 1945

... K. TRME

— page 181 —
Here'I'm ready to transcribe the text from the image. Please provide the image. I will follow all your instructions carefully to ensure high accuracy and proper formatting.

— page 182 —
- U.S.S. BOFFIN (SS 287) -- Report of NINTH WAR PATROL.

CONFIDENTIAL
Subject: U.S.S. BOFFIN (SS 287) -- Report of NINTH WAR PATROL.

— page 183 —
CONFIDENTIAL
Subject: U.S.S. BOFIN (SS 287) — Report of NINTH WAR PATROL.

2 June, 1945

1200 Position
Lat. - 29-50.0 N
Long. - 140-12.0 E

1524 Dove with unidentified plane coming in low at range of four miles.
1531 Surfaced. Proceeding at four engine speed to vicinity SOFU GAN to
search for B-29 survivors definitely reported down there.
1720 Exchanged calls by SJ radar with TINOSA who is also proceeding to
SOFU GAN for search.

0250 Made radar contact on SOFU GAN bearing 335°T; range 25,450 yards.
Visibility low, varying between 200 and 1500 yards.
0312 Fired green Very's pistol signal.
0318 SJ radar contact bearing 325°T, range 9,950 yards. He apparently had
SJ radar also. No luck in exchanging signals. For next hour, we were
both suspicious of each other.
0357 Proceeded with search for survivors in area to eastward of SOFU GAN.
0737 First SJ contact with rescue planes who were on radio circuit. Only
one plane was sighted during day, however, due low ceiling and
visibility varying between 100 and 500 yards. The morning was spent
at full speed searching many and various positions, reported by
planes as position of survivors.
1200 By now it was apparent that planes could obtain bearings on the
survivor's GIBSON GIRL, but were unable to correlate that information
with the location of SOFU GAN. Thus the morning had been wasted. At
about this time, TINOSA made the smart move of having rescue plane try
to sight her through the ceiling, then give her bearing to survivors.
We closed this vicinity (visibility 200-1500 yards) and at
1347 Passed close aboard the TINOSA with the survivors climbing aboard, her
ingenuity at last rewarded. Exchanged signals by light with TINOSA
and then set course for area at three engine speed. It is believed
that one other submarine participated in search, in addition to the
BOBCATS.
1410 SUMISU SHIMA bearing 351°T, range 60,000 yards by SJ radar.
1705 Held small arms training.

3 June, 1945

1200 Position
Lat. - 29-41.4 N
Long. - 134-09.8 E

1600 Set all clocks back one hour to -9 zone time.

.ALL TIMES HEREAFTER ITEM (-9) TIME

1520 Dove for training.
1555 Surfaced.
1637 Conducted small arms training and instruction.

- 3 -
ENCLOSURE (A)
[HANDWRITTEN: 737]
[HANDWRITTEN: 4]

— page 194 —
CONFIDENTIAL
Subject: U.S.S. BO FIN (SS 287) — Report of NINTH PATROL..
0614 (Torpedo attack No. 3). Having reached a minimum torpedo run of 3500
yards, decided to commence firing. Fired four torpedoes forward.
0619 All sound gears reported a torpedo coming in bearing 050° relative,
steady bearing. Fired #5 and #6 torpedoes at same target and gave
order to take her down.
0621 Sound had lost torpedo coming in, but still had #6 running out.
0622 Two explosions believed to be depth charges.
0623 One loud explosion, considered a possible hit at the time.
0623-0625 Numerous explosions. Believed to be depth charges and gunfire.
0631 Finally back at periscope depth. Sighted all targets going away with
no apparent sign of damage. A sad sight.
0658 Secured from battle stations and headed away from coast at 6 knots,
in order to surface and end around.
0919 Surfaced 14 miles offshore and commenced end around.
1015 Visibility began to close in.
1100 Fog now dense.
1119 First of about fifteen super contacts on SJ radar during next three
hours.
1238 (Ship Contact No. 11). SJ contact bearing 270°T, range 10,000 yards.
Contact was closing very fast, so turned south to avoid. He was
making at least 15 knots on a northeasterly course. Lost contact at
9500 yards. Felt sure he was an A/S vessel looking for us. Continued
on westward into Gulf of Korea for our original targets.
1300 Visibility to west and north had opened to unlimited. Headed north
for vicinity of estimated position of targets (near SHIKO).
1317 Sighted low flying aircraft at 350°T on southwesterly course, range
10 miles. He did not close.
1324 Visibility decreased again to 500 yards. Started doubling back on
northeasterly course.
1410 SJ radar contact at 030°T, range 8150 yards. This looked like our
escort friend. He turned off to southward, but this fellow started
hanging on like a leech. However his maximum speed was 15 knots.
1455 Lost contact at 15,000 yards, bearing 265°T. Contact had never been
sighted, but he had done a good job of sticking on our trail. Felt
sure he was able to take bearings on our SJ radar.
1510 Dove. Thought this fellow might come by and give us a shot. Visibil-
ity about 10,000 yards.
1521 Sighted tops of two stick masts bearing 298°T.
1524 Sighted tops of same masts bearing 293°T. Changed course to normal
approach course.
1530 Target no longer in sight due to closing visibility to 8000 yards.
1621 Surfaced. No SJ contacts except land. Contact was never regained.
He was probably a gunboat or frigate type escort with maximum speed
of 15 knots.
1630 Ran back up coast in hopes of regaining contact on original targets.
Visibility about 8000 yards.
1916 SJ SOU (off JOSHIN) bearing 335°T, range 11 miles.

[HANDWRITTEN: 737]
[HANDWRITTEN: 15]
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ENCLOSURE (A)

— page 200 —
```
CONFIDENTIAL
U.S.S. BOWFIN (SS 287)
Report of NINTH WAR PATROL.

Contact | Date      | Time  | Position of | Type                               | Range (yds) | Speed    | Course | Con-    | Remarks
No.     | (All times) |       | Contact     |                                    |             |          |        | tacted  |
||-------|||||||

— page 202 —
CONFIDENTIAL
Subject: U.S.S. BO FIN (SS 287) - Report of NINTH PATROL.
TORPEDO ATTACK REPORT FORM
Tubes Fired - No. 1 No. 2 No. 3 No. 4 No. No.
¢ Track Angle 94 P 96 P 96 P 99 P
¢ Gyro Angle 346 345 344.5 341
¢ Depth Set 6' 6' 6' 6'
¢ Speed Used in T.D.C. 27.1 27.1 27.1 27.1
¢ Hit or Miss Miss Hit Miss Miss
¢ Erratic (yes or no) No No No No
¢ Mark Torpedo 18-1 18-1 18-2 18-2
¢ Serial No. 55387 56595 57684 57965
¢ Mark exploder 8-7 8-7 8-7 8-7
¢ Serial No. 11186 10711 11251 11283
¢ Actuation Set Contact Contact Contact Contact
¢ Actuation Actual - Contact - -
¢ Mark Warhead 18-2 18-2 18-2 18-2
¢ Serial No. 4831 4836 4767 4697
¢ Explosive TPX TPX TPX TPX
Firing Interval - 0-10 0-10 0-10
Type Spread 1°R 1°L 1°R 1°L
Sea Conditions Flat Calm
Overhaul Activity U.S.S. APOLLO
Torpedo Run 2660 2700 2600 2635
Remarks - (Include details of each erratic performance of torpedoes, tubes, and
  fire control system and reason for misses, if known).
¢ Enter for each torpedo fired.
% Enter whether set for contact and magnetic or only contact actuation when applica-
  ble and on next line, your best estimate of type actuation actually resulting.
  (a) #2 Torpedo running time 177 sec.
  (b) Temperature of electrolyte 60.
  (c) Temperature of injection 55.
  (d) Believe target zigged away at or about time of firing.

[HANDWRITTEN: 737]

- 22 - ENCLOSURE (L) [HANDWRITTEN: 23]

— page 209 —
CONFIDENTIAL
Subject: U.S.S. BOWFIN (SS 287) — Report of NINTH WAR PATROL.
[HANDWRITTEN: J]
[HANDWRITTEN: BUSHIPS]

The noise has persisted since that time and increased in intensity. The source of
the noise has been traced to the after main bearing (generator end). This bearing
should be repacked during the refit. The brushes installed on this machine are
type S. 25, the proper grade, but have cut the commutator excessively. It is be-
lieved that these brushes are too hard and should be replaced with a softer brush.
The commutator should be dressed and a finishing cut taken on it when the bearing
is replaced.

The after main bearing on No. one lighting M.G. uses an excessive
amount of grease and should be inspected and renewed if necessary. The commutator
on this machine is also grooved and should have a finishing cut taken.

4. No. 2 Battery Ventilation Blower.

Number two battery ventilation blower vibrates excessively at high
speeds and when speed changes are made. The blower should be removed, inspected
and defects remedied.

5. No. 1 Periscope

Large quantities of water leak down by #1 periscope on the starboard
side. Since repacking has not halted the water flow, it is suspected that the water
leaks by outside of the packing, rather than between the packing and the periscope.
Repair facilities will be requested to pull this periscope during the refit and
remedy the cause. Also, the oil leakage on the starboard ram of this periscope is
exceptionally bad.

ORDNANCE AND GUNNERY

1. No. 7 Torpedo Tube Muzzle Door

On June 13, number seven torpedo tube could not be made ready for
a war shot. The muzzle door indicator read 85°-87° when the muzzle door had been
opened as far as possible by power and hand. Subsequent investigation which included
a careful inspection of the shutters and muzzle door and the taking of shutter clear-
ances, of which there may be some doubt as to accuracy, has led to the assumption
that the door is being fully opened, but that the indicator system is not functioning
properly.

2. Mk. Eighteen Torpedo Defects.

Three torpedoes had defects which should have been corrected by the
tender before issue to a submarine. One torpedo was missing a hydrogen eliminator
wire, a plug, and tacky wax seal. This was corrected by the tender before getting
underway. Another torpedo had a 30 volt ground. The third torpedo had to be charged
with air every two days to keep the flask pressure above 1500 lbs.

See Section (M) for report of defects of ST and SJ Radars and TBL
Transmitter.

- 29 -
[HANDWRITTEN: 2-XTRA]
[HANDWRITTEN: 737]
ENCLOSURE (..)
[HANDWRITTEN: 30]

— page 215 —
CONFIDENTIAL

Subject: U.S.S. BOFIN (SS 287) --- Report of NINTH PATROL

TIME | LOCATION | DEPTH | GRADIENT
DATE | | |
0455 (I) | 41-40.4N | 0-100 | -11° [HANDWRITTEN: HYDRO]
6-13-45 | 130-15.3E | 100-440 | -8.5° [HANDWRITTEN: 1-XTRA]

0400 (I) | 40-30.0N | 0-250 | -13°
6-20-45 | 129-18.0E | |

1510 (I) | 40-06.0N | 0-100 | -12°
6-20-45 | 125-58.2E | |

1200 (I) | 44-16.5N | 0-125 | -5°
6-22-45 | 137-17.8E | |

(P) HEALTH, FOOD & HABITIBILITY

The health of all hands generally was good during the patrol.
Quite a number of colds developed in the damp weather of the JAP SEA, but they
proved of short duration. One 50 cal. machine gunner suffered a broken rib during
a gun action, but he has no recollection of the circumstances. Recovery was prompt.

Food was good and well planned. It is generally found, however,
that near the end of the patrol ice cream is the food that does not suffer with
repetition. The sameness of the food probably was somewhat more pronounced than
usual due to the lack of fresh foods in GUAM.

The boat was comfortable, and the moisture encountered on the pre-
ceding patrol was greatly reduced by improved operation of air-conditioning
equipment.

(Q) PERSONNEL

The personnel situation is good almost without exception, and the
performance of duty of all hands was excellent. Only two personnel changes were
effected due to the short duration of the preceding patrol, greatly reducing the
number of men conspicuous by their "newness". It is expected that a number of
"plank-owners" will be transferred at the completion of this patrol. Although they
will be missed, most can be replaced from lower ratings on board.

The individual attention paid the unqualified men by ship's officers
was especially creditable, and the interest displayed by all hands to qualify was
above average.
(a) Number of men detached from previous patrol 2.
(b) Number of men on board during patrol 74.
(c) Number of men qualified at start of patrol 47.
(d) Number of men qualified at end of patrol 64.
(e) Number of unqualified men making their first patrol 2.

[HANDWRITTEN: 737]
ENCLOSURE [HANDWRITTEN: (A)]
- 35 - [HANDWRITTEN: 36]

— page 219 —
FB5-104/A16-3(2)
C-O-N-F-I-D-E-N-T-I-A-L
Serial: 023

SUBMARINE DIVISION ONE HUNDRED FOUR
                                                                fos
                                                    Care of Fleet Post Office,
                                                    San Francisco, California.

                                                    6 July 1945.

FIRST ENDORSEMENT to USS BOWFIN's
Conf ltr SS287/A16/A9 Serial 020,
dated 4 July 1945.

From:       The Commander Submarine Division One Hundred Four.
To :        The Commander-in-Chief, United States Fleet.
Via :       (1) The Commander Submarine Squadron Ten.
            (2) The Commander Submarine Force, Pacific Fleet.
            (3) The Commander-in-Chief, United States Pacific Fleet.

Subject:    U.S.S. BOWFIN (SS 287), Report of War Patrol Number NINE -

1.      The Ninth war patrol of the U.S.S. BOWFIN was conducted in the JAPAN
SEA area as a unit of a coordinated attack group consisting of TINOSA, FLYING FISH,
and BOWFIN which group was one of three under the combined command of Commander E.
T. HYDEMAN. This war patrol was of thirty-eight days duration, thirteen of which
were spent submerged.

2.      The thorough coverage of this area revealed fewer ship contacts than
could be reasonably expected. Two single AKs were sighted and sunk; one convoy of
three ships was unsuccessfully attacked:

            Torpedo Attack #1 On June 11th, contact was made with an unescorted
zigging AK by radar. A night surface radar attack was delivered using four Mk 18-1
torpedoes. Range 2430; track angle about 90°; small gyro angles; depth set at six
feet. One hit was seen, and target was observed to sink. The target was an MFM
freighter of an estimated length of 360 feet.

            Torpedo Attack #2 During daylight on June 13th, contact was made
with an unescorted small engines aft freighter similar to Sugar Charlie Love, Type
D (mod.). A submerged attack was made with three Mk 18-1 torpedoes. Range 600
yards; track angle averaging 100°; gyro angles small; depth set 6 feet. One hit
was heard and felt. One minute after firing target had disappeared and all that
remained was an overturned lifeboat and wreckage. The target undoubtedly sank.

            Torpedo Attack #3 A group of three ships consisting of a large
freighter followed by two small AKs were sighted on June 20th hugging the coast.
The closest range that could be attained was 3400 yards which gave an average torp-
edo run of 3500 yards. Six Mk 18-1 torpedoes were fired on track angles averaging
90°; depth set six feet; gyro angles were small. No hits were made. The misses
were probably the result of the long torpedo runs.

            Gun Attack #1 On June 14th a two-masted schooner was attacked at
2200. All guns were used but the blinding effect of the gunfire made the results
somewhat ineffective. Numerous hits were made but the schooner did not sink. Ac-
tion was broken off because of the difficulty in making hits on a dark night.

3.      The accuracy of the gunfire delivered by the unseen escort indicates
the Japanese have fire control radar that is rapidly improving in effectiveness.

— page 220 —
SUBMARINE DIVISION ONE HUNDRED FOUR

                                                                Care of Fleet Post Office,
                                                                San Francisco, California.

                                                                6 July 1945.

FB5-104/A16-3(2)
C-O-N-F-I-D-E-N-T-I-A-L
Serial: 023

FIRST ENDORSEMENT to USS BOWFIN's
Conf ltr SS287/A16/A9 Serial 020,
dated 4 July 1945.

Subject:        U.S.S. BOWFIN (SS 287), Report of War Patrol Number NINE.

— page 221 —
SUBMARINE SQUADRON TEN
Fleet Post Office
San Francisco, California
8 July 1945
11/rhb

FC5-10/A16-3
Serial: 0155

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

SECOND ENDORSEMENT to
U.S.S. BOWFIN (SS287)-
Report of War Patrol
Number Nine.

From: The Commander Submarine Squadron TEN.
To : The Commander-in-Chief, UNITED STATES FLEET.
Via : (1) The Commander Submarine Force, PACIFIC
FLEET, Administration.
(2) The Commander-in-Chief, U.S. PACIFIC FLEET.

Subject: U.S.S. BOWFIN (SS287) - Report of War Patrol
Number Nine.

1. Forwarded, concurring in the remarks of the
Commander Submarine Division ONE HUNDRED FOUR.

2. The Commander Submarine Squadron TEN takes
great pleasure in congratulating the Commanding Officer,
officers and crew of the U.S.S. BOWFIN upon the high degree
of courage and skill shown in the successful completion of
this difficult patrol, which will live long in the annals of
submarine warfare.

3. It is recommended that the U.S.S. BOWFIN be
credited with the following:

SUNK
1 - AK(EU) (Medium) 4000 tons
1 - AK(EU) (Small ) 2300 tons
Total sunk 6300 tons

DAMAGED
1 - Mis. (Schooner) 20 tons
Total damaged 20 tons

Total sunk and damaged 6320 tons

[SIGNATURE: G. E. PETERSON]
G. E. PETERSON.

— page 222 —
8    053

FF12-10(A)/A16-3(18)        SUBMARINE FORCE, PACIFIC FLEET             mr
Serial 01782                                       Care of Fleet Post Office,
                                [STAMP: EXTRA]     San Francisco, California,
CONFIDENTIAL                  [STAMP: SORG.......ORIGINAL]         16 July 1945.
                              [STAMP: PHOTO-LAB....MICRO]
THIRD ENDORSEMENT to        [STAMP: OP-16]   NOTE: THIS REPORT WILL BE
BOWFIN Report of            [STAMP: RETURN TO F-4253]          DESTROYED PRIOR TO
Ninth War Patrol.                                          ENTERING PATROL AREA.

COMSUBSPAC PATROL REPORT NO. 814
U.S.S. BOWFIN - NINTH WAR PATROL.

From:       The Commander Submarine Force, Pacific Fleet.
To  :       The Commander in Chief, United States Fleet.
Via :       The Commander in Chief, U.S. Pacific Fleet.

Subject:    U.S.S. BOWFIN (SS287) - Report of Ninth War Patrol
            (29 May to 4 July 1945).

            1.      The ninth war patrol of the BOWFIN, under the command
of Commander A. K. Tyree, U.S. Navy, was conducted in the western
section of the Japan Sea along the eastern coast of Korea. The U.S.S.
BOWFIN, U.S.S. FLYING FISH, and U.S.S. TINOSA formed a coordinated
attack group under the command of the commanding officer of the FLYING
FISH.

            2.      Enemy contacts were not as numerous on this daring,
outstanding patrol as might have been expected. The BOWFIN, however,
covered the area thoroughly; and, in typical BOWFIN aggressive man-
ner, delivered three torpedo attacks and one gun attack, which ac-
counted for two more enemy ships sunk and a small craft damaged.

            3.      Award of Submarine Combat Insignia for this patrol is
authorized.

            4.      The Commander Submarine Force, Pacific Fleet, takes
great pleasure in congratulating the commanding officer, officers,
and crew of the BOWFIN for this aggressive, successful patrol, another
illustrious performance added to the fighting BOWFIN's outstanding
record, of which every officer and man can well be very proud. The
BOWFIN is credited with having inflicted the following damage upon
the enemy during this patrol:

                                S U N K

1 - Medium AK (EU)                  -         4,000 tons (Attack No. 1)
1 - Small AK (Similar to SCL
    Type D Modified) (EU)           -         2,300 tons (Attack No. 2)
            TOTAL SUNK                        6,300 tons

                                D A M A G E D

1 - MIS (Schooner) (EC)             -            20 tons (Gun Attack No.1)
            TOTAL SUNK & DAMAGED              6,320 tons

Distribution & Authentication                               MERRILL COMSTOCK.
on following page.
                                - 1 -
[STAMP: FILMED]

— page 223 —
FF12-10(4)/A16-3(18) SUBMARINE FORCE, PACIFIC FLEET
Serial 01782 Care of Fleet Post Office,
San Francisco, California,
CONFIDENTIAL 16 July 1945.

THIRD ENDORSEMENT to NOTE: THIS REPORT WILL BE
BOWFIN Report of DESTROYED PRIOR TO
Ninth War Patrol. ENTERING PATROL AREA.

COMSUBSPAC PATROL REPORT NO. 814
U.S.S. BOWFIN - NINTH WAR PATROL.

Subject: U.S.S. BOWFIN (SS287) - Report of Ninth War Patrol
(29 May to 4 July 1945).

DISTRIBUTION:
(Complete Reports)
Cominch (7)
CNO (5)
Cincpac (6)
JICPOA (1)
AdICPOA (1)
Comservpac (1)
Cinclant (1)
Comsubslant (8)
S/M School, NL (2)
CO, S/M Base, PH (1)
Comsopac (2)
Comsowespac (1)
Comsubs7thFlt (Fwd Echelon) (2)
Comsubs7thFlt (Rear Echelon) (2)
Comnorpac (1)
Comsubspac (3)
ComsubspacAdComd (40)
SUBAD, MI (2)
ComsubspacSubordcom (3)
All Squadron and Div.
Commanders, Pacific (2)
ComSubOpTraGrBalboa (Airmail) (5)
Substrainpac (2)
All Submarines, Pacific. (1)

[SIGNATURE: E. L. Hynes]
E. L. HYNES, 2nd,
Flag Secretary.

[HANDWRITTEN: 737]
[HANDWRITTEN: 40]

— page 224 —
START OF REEL
JOB NO. [HANDWRITTEN: AR-14-81]
[HANDWRITTEN: E-108]

1.0
||||| 4.5 ||||| 2.8 ||||| 2.5
||||| 5.0 ||||| 3.2 ||||| 2.2
||||| 5.6 ||||| 3.6 ||||| 2.0
||||| 6.3 ||||| 4.0 ||||| 1.8
OPERATOR [HANDWRITTEN: L. Frye]

1.1
DATE [HANDWRITTEN: 2-5-81]

1.25 ||||| 1.4 ||||| 1.6

THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

[SEAL: DEPARTMENT OF DEFENSE UNITED STATES OF AMERICA]

MICROFILMED BY
NPPSO-NAVAL DISTRICT WASHINGTON
MICROFILM SECTION

REEL TARGET - START AND END
NDW-NPPSO-5210/1 (6-78)

— page 225 —
[HANDWRITTEN: NRS 1995-3)]

[HANDWRITTEN: BOWFIN (SS-287)]
[HANDWRITTEN: WWII REPORT FILE]
[HANDWRITTEN: ALL MATERIAL ON THIS REEL IS DECLASSIFIED]

[HANDWRITTEN: 35MM]

— page 226 —
DATE 29 September 1943 NAME BOWFIN
FROM Commanding Officer USS BOWFIN(SS-287)
SERIAL 011
DATE 7 October 1943
SUBJECT SPECIAL MISSIONS
Report(to CTF 71)of delivery of equipment & supplies to
forces of COL W.D.Fertig,USA in Iligan Bay area on 2 Sep-
tember and transportation of nine-man party from area on 29
September. Both Missions successful, conducted during
FIRST WAR PATROL. (SOWESPAC:SUBS G-2)
FILED: War Diary
Separately as CARBON COPY
MICROSERIAL NO. | ACTION REPORT OPNAV FORM 3880-13 (11-55)
G 20432

DATE 2 March 1945 NAME BOWFIN
FROM CO USS BOWFIN(SS-287) SERIAL 0001
DATE 25 March 1945
SUBJECT TORPEDO FIRING REPORT
Report of firing of Mark 27 torpedoes at 900 ton cargo
sea truck while on SEVENTH WAR PATROL in Japanese Home
Islands area.
(CENPAC: SUB OPS)
FILED: War Diary
Separately as PROCESSED COPY; as DUPLICATE COPY
MICROSERIAL NO. | ACTION REPORT OPNAV FORM 3880-13 (10-55)
B-21013

DATE 23 April-15 May 1945 NAME BOWFIN
FROM Commanding Officer USS BOWFIN(SS-287)
SERIAL 0003
DATE 15 May 1945
SUBJECT SONAR OPERATIONS
Report(to SUBSPAC)of FOX MIKE SONAR Operations during
EIGHTH WAR PATROL. Used device(s) off Honshu 2-7 May 1945.
(CENPAC:SUB OPS)
FILED: War Diary
Separately as ORIGINAL
MICROSERIAL NO. | ACTION REPORT OPNAV FORM 3880-13 (11-55)
G 20432

— page 227 —
A

DATE 29 May-4 July 1945 NAME BOWFIN
FROM Commanding Officer USS BOWFIN (SS-287)
SERIAL 003
DATE 3 July 1945
SUBJECT Operation BARNEY

Report of entry to and exit from Japan Sea during NINTH
WAR PATROL. One of group of U.S. Submarine which first
attacked Japanese shipping in the Japan Sea.
(CENPAC: SUB OPS)

FILED: War Diary

Separately as CARBON COPY

MICROSERIAL NO. ACTION REPORT OPNAV FORM 3480-13 (11-55)
G 20432

— page 228 —
In reply refer to:
SS287/A4-3
Serial ( 011 )

[STAMP: DE SECRET]

From:
To :

Subject:

Reference:

Enclosure: U. S. S. BOWFIN (SS287)
Care of Fleet Post Office,
San Francisco, Calif.

October 7, 1943.

The Commanding Officer.
Commander Task Force SEVENTY-ONE.

Special Missions - Report of.

(a) Annex "BAKER" to Task Force SEVENTY-ONE
Operation Order No. 26-43 dated 14 August,
1943.
(b) Commander Task Force SEVENTY-ONE despatch
Serial 78.
(c) Commander Task Forec SEVENTY-ONE despatch
Serial 15.

(A) Track chart of subject operations.
(B) Transfer report of secret and confidential
publications.
(C) Receipt for officer messenger mail, stores
and money.

1.
In compliance with references (a) and (b) this
vessel entered the MINDANAO SEA from SURIGAO STRAIT during dark-
ness the morning of 2 September, 1943 and at dawn submerged
off CAMIGUIN ISLAND. Surfacing after darkness a landfall
was made on SIQUIJOR ISLAND and course was set for ILIGAN BAY.
Submerged reconnaissance of the bay during daylight revealed
nothing more formidable than a few native "BANCAS" fishing off-
shore. It was later discovered that the Japanese have garri-
sons along the beach from ILIGAN to the western bank of the
AGUS RIVER and also at MISAMIS, and that one 2.4" field gun was
mounted on the point north of the old military reservation.
Had this been known a closer reconnaissance of the southeast
corner of the bay would have been made however it was ascertain-
ed that no enemy vessels were present at ILIGAN or MISIMAS. At 1300
the security signal was sighted, this was plotted to be 1.25
miles east of BINUNI POINT. It was so located, as was later ex-
plained, because there were no trees to support it at the desig-
nated point, also because it was less conspicuous from the shore.
The beach was closely inspected from a distance of about one
mile; one man, unmistakably American, in a semblance of uniform
was seen near the security signal. The mirage effect permitted

— page 230 —
SECRET
SS287/A4-3
( 011 )

Subject: Special Missions - Report of.

5. Before departing Brisbane all available officer's
mess and welfare funds were used to buy 5 cases of cigarettes
which were turned over to Lieutenant Colonel HEDGES as well as
condiments, butter, flour and other commissary stores as
such conditions. Dinner was served the visiting officers and
could be spared. Dinner was served the visiting officers and
sandwiches, coffee and pie to the working party while the boat
was taking in the first load. The choice of ham for the sandwiches
was unfortunate since all the natives were Mohammedans, however
they were very well pleased the the bread and butter since none of
them had any since the Japanese occupation. The crew gave away
all of the tooth paste, shaving cream, razor blades, tooth brushes,
soap, clothing, shoes and cigarettes they could spare and probably
more.

6. Reference (c) was received on the evening schedule,
September 28, 1943, while enroute to the rendezvous. At 0457, 29
September, 1943 submerged off SALIMBAL POINT and conducted sub-
merged reconnaissance of ILIGAN BAY with particular attention to
the pier at ILIGAN; nothing of interest was found. At 1250 the
security signal was sighted. During the afternoon the weather made
up with a strong southerly wind and heavy rainfall, visibility
varied from one to three miles. At 1700, at battle stations, sur-
faced about one mile off the beach and took the banca alongside;
COLONEL FERTIG and party came aboard. Due to the non-arrival of
some of the men who were scheduled to leave with us there was a de-
lay until 1840 in arrival of the evacuation party at which time the
following men came aboard for transportation:

GRASHIO, Samuel C., 2nd Lt., U.S.A., A.C., (Capt. U.S.A., temp)
MORGAN, Luis P., Capt. Philippine Constabulary (Lt.Col.USFIP, temp),
GLOVER, Dewitt L., CQM, U.S.N., (1st Lt., U.S.A., temp),
OFFRET, Elwood H., CMM, U.S.N., (1st Lt., U.S.A., temp),
OWENS, Paul A., CMM, U.S.N., (2nd Lt., U.S.A., temp),
NAPOLILLO, Francis J., SC1c, U.S.N., (2nd Lt., U.S.A., temp),
TUCKER, Tracy, Tech.Sgt., U.S.A., (2nd Lt., U.S.A., temp),
MINTER, Leonard, Sgt., U.S.A., (2nd Lt., U.S.A., temp),
KUDER, E.M., Civilian Director of Civil Affairs.

The passengers were given a physical examination, treated as
necessary, fed and berthed, however their state of excitement was
such that they did little sleeping.

7. A large amount of fresh fruit and coconuts was
brought in the launch, much more than could possibly be kept,
however all was taken aboard, inspected and the best retained.

[HANDWRITTEN: 4-]

— page 231 —
SECRET
SS287/A4-3
( 011 )

Subject: Special Missions - Report of.

Two cases of small arms ammunition and such stores, provisions
and medicine as we could spare were turned over to COLONEL FER-
TIG. At this time the cigarettes previously landed were paid
for. At 1917 the launch departed and we stood to sea.

[SIGNATURE: J. H. WILLINGHAM, Jr.]

— page 232 —
RESTRICTED

Form RPS 1 (Revised 1939)

Date
QUARTERLY OR TRANSFER REPORT
OF REGISTERED SECRET AND CONFIDENTIAL PUBLICATIONS DISTRIBUTED BY THE CHIEF OF NAVAL OPERATIONS
(D. N. C.—REGISTERED PUBLICATION SECTION)

FROM: [HANDWRITTEN: Commanding] Officer, U.S. Naval [HANDWRITTEN: Advanced] Radio Station
(Title) (Command)
To: Chief of Naval Operations (D. N. C.—Registered Publication Section).

1. I have in my possession and hold myself responsible for the following registered publications, distributed
by the Chief of Naval Operations (D. N. C.—Registered Publication Section).

2. This report consists of [HANDWRITTEN: one (1)] page(s).

| SHORT TITLE | NUMBER OF COPIES | REGISTER NUMBER OF COPIES | REMARKS |
|---|---|---|---|
| CSP 71(C) | 1 | [HANDWRITTEN: 13] | If quarterly report, enter here |
| CSP 72(C) | 1 | [HANDWRITTEN: 7] | latest RPM received |
| CSP 845 | 1 | [HANDWRITTEN: 19128] | |
| Combined W/T Procedure | 1 | [HANDWRITTEN: Non Registered] | |
| Combined Prosigns | | [HANDWRITTEN: Non Registered] | |
| [HANDWRITTEN: /] | | [HANDWRITTEN: /] | |

In accordance with
VCNO dispatch
[HANDWRITTEN: 161945 of August,]
[HANDWRITTEN: 1943.]

Page No. [HANDWRITTEN: one]

NOTE.—All corrections must be initialed in ink.

Quarterly return.—Checked in accordance with instructions contained in current edition of the Registered
Publication Manual by [SIGNATURE: illegible] and [SIGNATURE: illegible]
(Signature of officer taking inventory) (Signature of custodian) Commanding.

Transfer receipt.—Received the above from [HANDWRITTEN: Lt. Comdr C. Parsons, U.S. Navy.]
(Signature of officer receiving publications)

16—9602
ENCLOSURE (B)

— page 233 —
[HANDWRITTEN: 14061]
FE24-71/A3-2(1)/ UNITED STATES NAVY 16-lcs
A16-3

Serial 00420 22 October 1943

SECRET
_______

FIRST ENDORSEMENT to
BOWFIN secret ltr. SS287/
A4-3 serial (011) of
7 October 1943.

From: Commander Task Force SEVENTY-ONE.
To : Commander SEVENTH FLEET.

Subject: U.S.S. BOWFIN Special Missions.

1. Forwarded.

2. Enclosure (A) was returned to Commanding Officer,
U.S.S. BOWFIN.

[SIGNATURE: R. W. CHRISTIE]
R. W. CHRISTIE.

— page 234 —
A8-4
UNITED STATES FLEET
COMMANDER SEVENTH FLEET
25/cs

Serial: 01266
SECRET
SECRET
OCT 30 1943

SECOND ENDORSEMENT to
CO BOWFIN Secret Ltr.
SS287/A4-3, serial 011,
dated 7 October 1943.

From: The Commander Seventh Fleet.
To: The Commander in Chief, Southwest Pacific Area.

Subject: U.S.S. BOWFIN Special Missions.

1. Forwarded for information.

2. Return of all papers is requested.

[HANDWRITTEN: 08697]

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

— page 235 —
[STAMP: DECLASSIFIED]
[STAMP: CONFIDENTIAL]
[HANDWRITTEN: ①]

U. S. S. BOWFIN (SS 287)
Care of Fleet Post Office
San Francisco, California

SS287/S75

Serial 0001

25 March 1945

From: The Commanding Officer.
To: The Commander in Chief, United States Fleet.
Via: (1) The Commander Submarine Division Two Eighty Two.
     (2) The Commander Submarine Squadron Twenty Eight.
     (3) The Commander Submarine Force, Pacific Fleet.

Subject: U.S.S. BOWFIN, Top Secret Report of Firing Mark 27 Torpedoes,
         Patrol Number Seven.

Enclosure: (A) Subject Report.

1. Enclosure (A) is forwarded herewith.

A. K. TYREE

[STAMP: DECLASSIFIED]
[HANDWRITTEN: By R. K. DOD DIR 5200.9 DATE 4-14-60]

[STAMP: DECLASSIFIED]

— page 236 —
CONFIDENTIAL

(MARK 27 TORPEDO ATTACK FORM)

U.S.S. BOWFIN (SS 287) Mark 27 Torpedo Attack No. [HANDWRITTEN: 3] Patrol No. [HANDWRITTEN: 7]
Time [HANDWRITTEN: 0725 (K)] Date [HANDWRITTEN: 3-2-45] Lat. [HANDWRITTEN: 33-50.0N] Long. [HANDWRITTEN: 139-22.0E]
Sound conditions [HANDWRITTEN: Poor] Depth of water [HANDWRITTEN: 800 Fathoms]
Distance to nearest shore or reef [HANDWRITTEN: 10 Miles] Sea Condition [HANDWRITTEN: 4]
Was it raining? [HANDWRITTEN: No]

TARGET DATA - DAMAGE INFLICTED

Description Target contacted by SJ radar, not zig-zagging; no other ships
in company. Target sighted from bridge at 7000 yards on dark
night. Estimated to be 175 feet long, 900 tons. One mast
forward. He had engines, bridge, and small stack amidships.
Very wide beam. After deck was stacked high, level with bridge,
with unidentified cargo.

Ship Sunk [HANDWRITTEN: 900 ton cargo sea truck.]
Ship damaged
Damage deter- Saw target sink through periscope from 3000 yard range.
mined by
Target draft [HANDWRITTEN: 10 ft.] Course [HANDWRITTEN: 007] Speed [HANDWRITTEN: 9.5] Range [HANDWRITTEN: 700] (at firing).
Target turn count [HANDWRITTEN: None Taken] Target bearing at firing instant [HANDWRITTEN: 186°T.]
[HANDWRITTEN: 169° Rel.]
Give any peculiarities noted in target's sound output [HANDWRITTEN: Target screws very noisy.]

OWN SHIP DATA

Speed [HANDWRITTEN: 2] Course [HANDWRITTEN: 017-3/4] Depth [HANDWRITTEN: 190 feet] Angle [HANDWRITTEN: 0] (at firing).

FIRE CONTROL & TORPEDO DATA

Was target aware of submarine's presence? [HANDWRITTEN: No]
Was submarine being depth charged? [HANDWRITTEN: No]
Type attack [HANDWRITTEN: This was a stern chase. Target's speed had been accurately]
[HANDWRITTEN: determined by surface radar tracking prior to submergence. Went]
[HANDWRITTEN: to 190 feet at range 2800 yards. Two ranges by ST periscope were]
[HANDWRITTEN: taken before going deep. Used T.D.C. and plot set up to fire at]
[HANDWRITTEN: 700 yards range, combined with decibel meter calibration on JP-1]
[HANDWRITTEN: sound gear. Fired on a -4 reading on JP decibel meter (Gain]
[HANDWRITTEN: control of JP-1 set at 4.1, filter at 3000 cps, detector off). 1740]
[HANDWRITTEN: Fired at 0725(K). Explosion at 1m - 30s after order "fire".]
[HANDWRITTEN: Target screws stopped. Target sank at 0830(K).]

[HANDWRITTEN: - 1 -] ENCLOSURE (A)

— page 237 —
[HANDWRITTEN: CONFIDENTIAL]
MARK 27 TORPEDO ATTACK FORM (Continued)

Tube fired from | Tube No. 9 | Erratic (Yes or No) | No
Hit or Miss | Hit | Time from firing to hit | 1m - 30s
Mark torpedo | 27 | Serial No. | 428
Mark warhead | | Serial No. | 1472
Mark exploder | Mark 11 Mod 0 | Serial No. | 1472
Arming distance set | 100 yards
Issuing activity | Pearl Harbor, T.H.

Comments: (a) It is believed that a better method for insuring that the ex-
    ploder becomes mechanically armed could be devised. On some of
    the torpedoes, it is difficult to pull the arming wire out of
    the impeller shaft, using a straight pull. This difficulty
    might cause the arming wire to part, instead of pulling the
    arming wire out of the impeller shaft, on an actual shot wherein
    the arming wire has to bend around the warhead of the torpedo.
    It was noted that the length of the arming wires varied as much
    as six inches.

(b) It is believed that a better fair lead or funnel should be
    installed at the end of the wooden guide tube, through which
    the arming wire reeves when the cable is reeled in.

(c) On the one war shot the steel cable parted where the nut attaches
    the steel cable to the copper arming wire. The copper arming
    wire was not recovered. It must have pulled clear of the im-
    peller shaft, then fouled on some part of the torpedo as the
    torpedo ran out of the tube. On one practice firing at PEARL
    HARBOR, this same casualty occurred. Can a more satisfactory
    wire be obtained?

(d) Considerable attention must be paid to the preservation of the
    arming wire and the steel wire to which it attaches, to prevent
    corrosion of the wire. Attention must also be given to lubri-
    cation of the wire passages through the impeller shaft, starting
    motor switch, and ventilation and heater circuit switch, to
    prevent sticking.

(e) The wire strap which secures the torpedo to the loading tray
    should be stronger. At present, the loading tray and torpedo
    too frequently part company in the process of sliding down the
    torpedo loading hatch. In SAIPAN, during the process of unload-
    ing and loading, incident to changing depth settings, the wire
    strap parted on three different torpedoes. Fortunately, no real
    accidents occurred.

- 2 -
ENCLOSURE (A) [HANDWRITTEN: 4 1740]

— page 238 —
[HANDWRITTEN: T]
[HANDWRITTEN: T]
CONFIDENTIAL
FF12-10(A)/A16-3 SUBMARINE FORCE, PACIFIC FLEET
Serial 00021

[HANDWRITTEN: A16-3/ss]
[HANDWRITTEN: 133-7-45A]
[HANDWRITTEN: 1d 0160]

Care of Fleet Post Office,
San Francisco, California,
April 1945
[STAMP: Reg. No. O05150]
[STAMP: R.S. No. 4 1740]

FIRST ENDORSEMENT
C.O. USS BOWFIN (SS287) to ComSubPac
ltr file SS287/001 dated 25 March 1945.

From: The Commander Submarine Force, Pacific Fleet.
To: The Commander in Chief, United States Fleet.
Via: The Commander in Chief, U.S. Pacific Fleet.

Subject: U.S.S. BOWFIN (SS287), Top Secret Report on
Firing Mark 27 Torpedoes, War Patrol No. 7.

1. Forwarded.

2. The following comment is offered relative to the ma-
terial comments contained in this report: The exploder arming wire
is being eliminated by the use of a spring loaded friction brake
which prevents arming of exploder in the tube. The steel launching
cord has been replaced by a monel cord, which is non-corrosive. The
loading tray and securing strap have been improved since the BOWFIN
was loaded.

3. The Commander Submarine Force, Pacific Fleet, con-
gratulates the commanding officer, officers, and crew of the BOWFIN
for this excellent attack with a new weapon. Credit for the sinking
has been included in the Force Commander's endorsement of the seventh
war patrol report.

MERRILL COMSTOCK
[STAMP: COMMANDER-IN-CHIEF U.S. PACIFIC FLEET FLAG OFFICE RECEIVED APR 24 1945 1740]

DISTRIBUTION:
Cominch (2)
CNO (2)
Cincpac (2)
Comsubpac (2)
Comsubpacadcomd (2)
Comsubstrainpac (2)
Comsubslnt (2)
Comsubs7thfleet (1)
All Squadron Commanders (1)
All Division Commanders (1)
BuOrd (2)
BuShips (2)
CO USS BOWFIN (1 copy this
endorsement only.)

[HANDWRITTEN: E.L. Hynes]
E. L. HYNES, 2nd.,
Flag Secretary.

[HANDWRITTEN: 000451]
24 APR 1945

2nd Endorsement
CinC Pacific Fleet
To: [HANDWRITTEN: Cominch]
Via:

[SIGNATURE: REKeeton]
R. E. KEETON
By Direction
[STAMP: 4 1740]
[HANDWRITTEN: A16-3(16)]

— page 239 —
[STAMP: DECLASSIFIED]
[STAMP: TOP SECRET]
SS287/S68

[HANDWRITTEN: 3]
U. S. S. BOWFIN (SS 287)
Care of Fleet Post Office
San Francisco, California
[STAMP: DECLASSIFIED] [STAMP: OPNAN INST 5500.30]
[HANDWRITTEN: BY JBK DATE 10-9-49]
15 May 1945

Serial 0003

From: The Commanding Officer.
To: The Commander Submarine Force, Pacific Fleet.

Subject: Fox Mike Sonar Operations - U.S.S. BOWFIN, Eighth War Patrol -
Period 23 April, 1945 to 15 May, 1945.

Reference: (a) ComSubPac Secret despatch 090601, Serial Five Seven, of
April, 1945.
(b) ComSubPac Secret despatch 290149, of April, 1945.
(c) U.S.S. BOWFIN - Report of EIGHTH War Patrol.

Enclosure: (A) Sketch of Track, May 3,4,5, and 7, 1945, in vicinity of
restricted area southeast of SHIRIYA SAKI in
light.
(B) Report of Materiel Difficulties - FM Sonar.

[HANDWRITTEN: ComSubPac BOX #T3-546 RS #10]

1.
Reference (a) directed BOWFIN to investigate the two northern
restricted areas of JICPOA chart D-2089. This task was designated as second-
ary to sinking any ships encountered.

2.
The following is a narrative of that part of the patrol
relating to the use of FM Sonar. All times KING, as are those on attached
track chart:

2 May, 1945 -- Closed HONSHU coast with position in doubt. Dove for submerged
patrol at 0730. Tested FM sonar during afternoon for about two
hours: Operation apparently satisfactory, although training
was considerably stiffer than upon departure from GUAM. We had
bucked seas on last three days enroute area. Rigged bow plane
wires on surfacing.
[HANDWRITTEN: FILE S 68 JACKET #B4]

3 May, 1945 -- Put triplane over and dove at 0520 for test. Triplane suspended
at 40 feet. Sea calm. Water temperature 37°F. Obtained maxi-
mum range of 250 yards, minimum range of 250 feet, and reliable
range of 175 yards. This was considered excellent. Surfaced at
0713, recovered triplane, and closed the coast. Dove at 0804
for submerged patrol. No contacts on FM (we just barely entered
eastern edge of the restricted area where water is 1730 fathoms
deep). At 1730, sighted a rusty floating mine through periscope. Surfaced
at 1955.

4 May, 1945 -- Dove at 0447. At 0740 sighted a sampan at 4000 yards bearing
268°T. He proceeded on course 345°T, rounding SHIRIYA SAKI
light at about one mile, then headed west. 0830-0900 BOWFIN
was possibly the object of a well directed search by two JAKES.
0852 JAKE was sighted at one-half mile coming in on an eastern low
light at about one mile ahead. With angle on bow 40° decreasing, dropped down
to 100 feet and changed course to S.E. Suspected detection by
sono listening station. There were no surface patrols sighted

— page 240 —
TOP SECRET
SS287/S68

Serial 0003
From:
To:
Subject:

5 May, 1945 - U. S. S. BOWFIN (SS 287)
Care of Fleet Post Office
San Francisco, California

15 May 1945

The Commanding Officer.
The Commander Submarine Force, Pacific Fleet.

Fox Mike Sonar Operations - U.S.S. BOWFIN, Eighth War Patrol -
Period 23 April, 1945 to 15 May, 1945.

on this date. FM was secured at 0900 and manned again at 1006.
Operated FM throughout the morning and afternoon.
No mine contacts on FM. Surfaced at 1956.

0438 Inspected bow plane wires. Found starboard wire had
parted and three-fourths of its length was missing. Cause un-
known. We had not encountered any rough seas since rigging the
wires. 0531 Dove for submerged patrol northeast of ESAN SAKI
(investigating for torpedo targets this date). Operated FM
throughout the day. No mine contacts. Track through following
points in sequence:

                                41-55.2N, 141-26.0E
                                41-56.3N, 141-24.0E
                                41-56.2N, 141-17.0E
Straight line                   41-58.7N, 141-14.8E
between points.                 41-58.3N, 141-07.2E
                                41-59.7N, 141-07.0E
                                42-01.3N, 141-14.6E

The area covered is not reputed to be mined. However, it may
be of interest if there is any traffic from MURORAN to TSUGARU.
(We had no JICPOA charts for Areas 1,2,& 3, due to change in area
assignment after departure on patrol). Feel sure there are no
mines in this area.

6 May, 1945 - 0442 Dove. 0900 Commenced run down mine line ABLE of reference
(b), varying course between 160°T and 210°T, current setting
about 170°T, 3/4 knot. 1155 Made first FM contact which was
evaluated as a mine. The following contacts were considered to
be mines although no definite pattern of a mine field could be
determined:

        TIME    BEARING (Rel)   RANGE
        1155    325°            250 yds.
        1213    000°            350 yds.
        1239    320°            300 yds.
        1250    000°            250 yds.
        1258    035°            600 yds.
        1346    355°            550 yds.

— page 241 —
TOP SECRET
SS287/S68

Serial 0003

From:
To:
Subject:

Ship was maneuvered to avoid those contacts ahead or nearly
ahead. Minimum range was 350 feet. If these were mines, they
must have been set deep. Charted depth of water leads to con-
siderable doubt as to authenticity of mines in this location.
However, we were sufficiently convinced and at 1308 changed
course to 045° and headed out.

During the forenoon, a fishing trawler of about 500 tons was
plotted in running down exactly over Mine Line BAKER. ST peris-
cope ranges were used in plotting in positions 1 through 4 (See
track chart on which trawler is mistakenly called a sampan). At
or about Latitude 41°-03' N, trawler turned to course 270°T and
proceeded toward coast. Lost sight of him at 1030 about one
mile west of position 6 on chart, still heading west.

Six to eight fishing sampans were sighted during day. The
popular fishing ground on this date was an area between 100
fathom curve and mine line BAKER between Latitudes 41°-08' N,
and 41°-03'N.

Sound conditions were excellent on this date. Injection was
38°F upon diving, increasing to 42° by 1400. No gradient.

In addition to the contacts listed above as mines, we had
numerous other contacts at 100-250 yards between 1130 and 1400,
which were intermittent and with no definite continuous tone.
These were evaluated as fish; a number of these were timed at a
speed of approach more than double own ship's speed over the
ground.

Secured FM at 1904 and surfaced at 2020.

7 May, 1945 -- 0423 Dove to investigate area north of mine lines ABLE and
BAKER. 1049 Manned FM. 1142 Secured FM; a patrol boat of SC
type, who had escorted a small freighter from SHIRIYA SAKI
south to MONOMI SAKI, was acting suspicious - alternately
lying to and swinging about at a range of about 5000 yards.
1244 Patrol boat headed north toward SHIRIYA SAKI. 1255 Manned
FM. Closing 100 fathom curve on course 210°T at Battle Stations
for two southbound targets. At 1325, had first of four definite
contacts, evaluated as mines. Ranges varied from 250 yards to

— page 242 —
TOP SECRET
SS287/S68

Serial 0003

From: The Commanding Officer.
To: The Commander Submarine Force, Pacific Fleet.
Subject: Fox Mike Sonar Operations - U.S.S. BOWFIN, Eighth War Patrol -
         Period 23 April, 1945 to 15 May, 1945.

U. S. S. BOWFIN (SS 287)
Care of Fleet Post Office
San Francisco, California

15 May 1945

450 yards. Zig-zagged through these. They were in a line
approximately 195°-015°T. Minimum range - 150 feet. Feel
certain these contacts were mines, although we also had six
to eight indefinite contacts during this same period,
evaluated as fish. At 1400, decided to pull out and get
our targets off TODO SAKI in the morning, which we did.
(See reference (c), Attack #2). No further contacts after
1410. Surfaced at 1756 and headed south.

No further FM investigations were made. We had planned to
cross the first mine line north of TODO SAKI on 9 May, but
decided against it in view of the visibility existing dur-
ing the night and morning of 9 May (average 500-2000 yards).

It is regretted that the job in the northern restricted area
was left uncompleted.

Notes:
All runs at periscope depth. Average ship's speed - 1.8 knots.
Currents indicated on H.O. chart #3308 are generally accurate,
although the set is closer to 165°T than 180°T in the areas
covered. Position was obtained by accurate periscope bearings
on landmarks, taking cuts every 30 minutes. The following
landmarks were the only useful ones: SHIRIYA SAKI lighthouse;
KUWAHATA YAMA (1312 ft); KATASAKI YAMA (987 ft); KANETSU YAMA
(1706 ft); and ASAHINA TAKE (3264 ft). The chart used in the
area will be preserved for inspection. The need for a silent
fathometer was felt many times.

[SIGNATURE: A. K. TYREE]

Copy to ComSubRon
ComSubDiv

— page 243 —
TOP SECRET
15 May 1945
Subject: Fox Mike Sonar Operations - U.S.S. BOWFIN, Eighth War Patrol -
Period 23 April, 1945 to 15 May, 1945.

— page 244 —
[HANDWRITTEN: ┌]
[HANDWRITTEN: ┐]
[HANDWRITTEN: BARNEY]
[STAMP: DECLASSIFIED]
[STAMP: SECRET]
[HANDWRITTEN: 2]
U. S. S. BOWFIN (SS 287)
Care of Fleet Post Office
San Francisco, California
[STAMP: DECLASSIFIED] [STAMP: OPNAV INST 5500.30] 3 July, 1945
[HANDWRITTEN: BY JGK DATE 10-4-60]

SS287/S68

Serial 003

From: The Commanding Officer.
To: The Commander Submarine Force Pacific Fleet.

Subject: Report of Entry to and exit from JAPAN SEA - U.S.S. BOWFIN
- Ninth War Patrol.

Enclosure: (A) Track chart of submerged passage of TSUSHIMA STRAIT,
entering JAPAN SEA - 6 June, 1945.
(B) Report of TSUSHIMA STRAIT passage.
(C) Track chart of surface passage of LA PEROUSE STRAIT,
exiting from JAPAN SEA - 24-25 June, 1945.
(D) Report of LA PEROUSE STRAIT passage.

1.
Enclosures (A) to (D) inclusive are forwarded herewith, as
supplementary information relative to the Ninth war patrol of this vessel, con-
ducted in the JAPAN SEA during the period 29 May, 1945 to 4 July, 1945.

A. K. TYREE

[HANDWRITTEN: ComSubPac BOX #S5606 RS #240]
[HANDWRITTEN: FILE P16(C) JACKET # 104]

[HANDWRITTEN: └]
[HANDWRITTEN: ┘]