U.S.S. CAVALLA (SS-244) — war patrol report SS-244_CAVALLA.pdf

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1944, USS CAVALLA was placed in commission at the Submarine Base, New London, Connecticut, on 29 February 1944, and had the distinction of being the first "Leap Year" boat built by the Electris Boat Company, Groton, Connecticut. Lieutenant Commander Horman J. Kossler, USN, accepted command of the new submarine and, after reading his orders, set the first watch. Among the visitors present for the ceremony was Mrs. Merrill Comstock who, as sponsor, had christened CAVALLA at her launching on 14 November 1943.

The period of 29 February to 11 April 1944, was spent in the New London and Newport areas, where special training and test trials were conducted. Much snow and ice were not conducive to good training, but all tests and exercises were successfully completed on time and CAVALLA was ready to join the fighting forces in early April 1944.

On 11 April CAVALLA got underway from New London for Pearl Harbor, via the Panama Canal. Although German submarines were still operating on a fairly large scale in the Atlantic, no contacts were made. Four days were spent in Balboa for minor repairs before proceeding on to the Hawaiian base. Other than friendly plane and ship contacts, the voyage was uneventful and the submarine arrived at Pearl Harbor on 9 May. She remained in the area until 31 May undergoing minor repairs and conducting intensive operational training.

CAVALLA's first war patrol extended from 31 May to 3 August 1944. It was conducted in the Eastern Philippine area and was of 64 days duration; 40 days on station. While enroute to the station area, she stopped at Midway to top off fuel bunkers. About 2000 on 17 June, CAVALLA sighted a large Japanese task force several hundred miles west of Saipan and as the submarine was directly ahead of this force she immediately commenced tracking. The ships were making very high speed and were heading toward Japan; evidently going the east- ence of this island, as it had just been invaded by our forces. The closest ship was a large carrier which was tracked by radar until CAVALLA was forced to dive to avoid detection. Although a good start-up on the carrier was obtained and it was believed a successful attack could have been made, the tough decision was reached to keep the submarine's presence unknown, obtain as much information on the enemy force as possible, and relay this on to the U. S. forces as soon as possible. As the enemy force passed overhead, a count was made of their ships and, when all was clear, SS-244 surfaced and sent the information to the U. S. surface forces. It was found out later that this information proved to be of great value and resulted in the First Battle of the Philippine Sea. Although CAVALLA pursued the Jap force, contact was not regained.

On the morning of 19 June, a Japanese task force was sighted consisting of a SHOKAKU Class carrier, two heavy cruisers, and three destroyers. The carrier was heading into the wind at 24 knots taking

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2 - USS CAVALLA (SS 244)

taking on planes. When first sighted, three planes were circling for a landing and the flight deck had almost a complete load. Six torpedoes were fired and at the time of firing, two of the planes had landed and the third was getting ready to come in. Three torpedoes hit their mark and the carrier sank soon afterwards. CAVALLA was then depth charged for about three hours by the three destroyers. Well over 100 charges were dropped but the submarine escaped unscathed.

On 1 July CAVALLA enjoyed the privilege of being the first submarine to enter Saipan, where she refueled. The fighting was still going on and, as the sub anchored only a mile off the beach, the crew had a rings.de seat. Units of the Fleet borrowed Saipan all day, planes bombed intermittently, and at times the Marines could be seen on the beach making good use of their guns, tanks, and flame throwers.

In the early afternoon of 18 July, CAVALLA sank a 100-ton sampan with gunfire about 50 miles east of Luzon, Philippine Islands. She departed for Majuro, Marshall Islands, on 25 July and arrived there on 3 August.

The submarine spent the month of August at Majuro where she was refitted and the crew given a period of rest and training. Then, on 30 August 1944, she set course for the Philippine area on her second war patrol which was of 53 days or the

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3 - USS CAVALLA (SS 244)

was frustrated when one of the escorting vessels forced CAVALLA to go deep, just before firing, to avoid collision. The attack was completed by sound contact as soon as the destroyer had passed overhead, but no hits were made.

On 5 January the submarine made a night surface attack on a Japanese convoy consisting of two small freighters, one small tanker and two escorts. Three bow torpedoes were fired at a freighter and the overlapping ship. Both ships were hit; after which they exploded and sank. CAVALLA again evaded on the surface while both enemy escorts dropped depth charges and fired their guns in all directions.

Due to the extended stay on station, CAVALLA was forced to stop at Emouth Gulf to take aboard sufficient fuel to get her back to base. The submarine arrived at Fremantle, Australia, on 13 January 1945, for refit, rest and training.

The fourth war patrol began on 25 March 1945 and was of 46 days duration. In her 37 days on station, CAVALLA operated in the South China Sea and French-Indo-China areas. Upon one occasion she was forced to submerge by an enemy plane which dropped two bombs very close aboard. Several sailing craft were sighted but upon investigation all appeared to be friendly. About a week was spent searching for downed aviators, with negative results.

In the early afternoon of 18 March, a torpedo was fired at CAVALLA by an enemy submarine but quick maneuvering by the officer of the deck caused the torpedo, which broached several times, to miss ahead. Many floating mines were sighted, several of which were sunk or exploded by gulffire.

CAVALLA arrived at Subic Bay, Luzon, Philippines Islands, on 25 March 1945 for refit. Since the rest camp was not yet completed, in order to provide recreation, sightseeing trips to Manila were arranged for all hands. The commanding officer also flew down to Mindoro for two days, and had the interesting experience of a 12-hour mission over French Indo-China in a PBY-2.

33-244 began her fifth war patrol on 20 April 1945 which extended into the South China Sea and Java Sea areas. It was of 38 days duration; 30 days on station. No attacks were made on this patrol, though the submarine went alongside and investigated many sailing vessels; all of which appeared to be friendly. She stood life-guard duty for a week south of Hong Kong prior to heading for patrol in the Java Sea but, though every day large flights of B-29's passed overhead, none of them ever ran into any trouble. Twice during this patrol, the conning tower almost flooded upon diving, due to a jammed hatch, but quick action in each case prevented any damage.

On the morning of 21 May, HMS TERRAPIN was sighted. The British submarine had been badly depth charged the day before and was unable to dive or make more than ten knots on the surface. CAVALLA joined

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4 USS CAVALLA (SS 244)
up with TERRAFIN, manned all machine guns, and escorted her without incident through the Java Sea, Lombok Strait, and down to Fremantle, Australia, arriving on 27 May.

After undergoing refit in Fremantle until 24 June, CAVALLA got underway for Guam with a special cargo of torpedoes. Proceeding east of Timor, through the Bamda Sea, Manila Strait, east of Obi Major, through the Halmahiera Sea, and through the passage between Halmahiera and Gebe Islands, CAVALLA joined up with an escort north of Halmahiera on 4 July and arrived at her destination 4 days later.

CAVALLA remained in Guam until 5 August 1945, for voyage repairs and training and then got underway on her sixth war patrol. This patrol took her to the Japanese home island area and was of 38 days duration; 21 days on station. No attacks were made as the submarine was on lifeguard station the entire patrol. In the early afternoon of 13 August she made a submerged approach on four destroyers 50 miles off the coast of Honshu but they turned out to be U.S. ships. They detected CAVALLA at about 9,000 yards and came in for the kill. However, the identification signals worked efficiently and at 3,000 yards they sheared off and let the submarine alone.

On the morning of 15 August 1945, word was received from Commander Submarines Pacific that hostilities were over and to "cease fire." At that time CAVALLA was on lifeguard station, 25 miles off Irubo Sakti, Honshu, with the planes circling overhead as fighter cover. At 1146 the planes reported that they had been recalled to their carrier and immediately shoved off. Fifteen minutes later a plane, which radar had picked up at about six miles and gave a weak IFF response at four miles, suddenly appeared out of the overcast dead ahead, position angle about 30 degrees. The plane went into a dive directly for CAVALLA just after it had been sighted and, at about 1,500 feet altitude, dropped a 50 to 100 pound bomb. CAVALLA increased to full speed and cleared the bridge -- and the bomb missed her starboard quarter about 100 yards. The plane did not strafe but, when about a mile east, commenced circling to make another run. The submarine then submerged and no further attacks were made. About an hour later, CAVALLA surfaced and notified the U.S. Fleet by dispatch that the Jap air force had not yet received the news that the war was over.

On 30 August, CAVALLA joined up with ten other submarines and a destroyer escort and proceeded to Tokyo Bay. She entered on 31 August and moored in a nest alongside USS PROTEOUS, remaining there for the signing of the peace treaty.

On 3 September, with ten other submarines, CAVALLA departed from Tokyo Bay enroute to Pearl Harbor and four days later turned on her running lights for the first time. She crossed the International Dateline on 8 September -- having crossed it, going in the other direction, fifteen months before.

Arrival was made at Pearl Harbor on 12 September and after voyage repairs were made and provisions and fuel taken aboard, she got underway for Panama and the East Coast on the 15th.

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5 - USS CAVALLA (SS 244)
By Directive dated January 1947, USS CAVALLA (SS 244) was placed out of commission, in reserve, attached to the U. S. Atlantic Reserve Fleet. Her berthing area is New London, Connecticut.

During her World War II commissioned service, USS CAVALLA logged approximately 90,000 miles and made 570 dives. At the end of the war, she still had aboard two officers and thirty-two enlisted men of her original crew.

CAVALLA accounted for 34,180 tons of enemy ships sunk during her career. On 19 June 1944 she destroyed SHOKAKU, an aircraft carrier of 30,000 tons; on 25 November 1944, SHIMOTSUKI, a destroyer of 2,300 tons; on 5 January 1945, SHUNSEN MARU, a cargo ship of 971 tons; and on the same date, KANKI MARU, an ex-net tender of 909 tons.

* * * *

For her first war patrol in the Eastern Philippine Area, 31 May to 3 August 1944, USS CAVALLA was awarded the PRESIDENTIAL UNIT CITATION.

In addition she earned four Battle Stars on the Asiatic-Pacific Area Service Medal for participating in the following operations:

1. Star/Marianas Operation
   - Battle of Philippine Sea -- 19-20 June 1944
2. Star/Western Caroline Islands Operation
   - Capture and Occupation of Southern Palau Islands -- 6 September to 14 October 1944
   - Assault on the Philippines Islands -- 9-24 September 1944
3. Star/THIRD Fleet Operations against Japan -- 10 July to 15 August 1945
4. Star/Submarine War Patrol, Pacific -- 14 November 1944 to 13 January 1945.

USS CAVALLA also earned the Navy Occupation Service Medal, Pacific for the period of 2-3 September 1945.

NOTE: All estimates of sinkings, tonnage, and types sunk are taken from the commanding officer's evaluations during the war patrol.

STATISTICS
Overall length: 312 feet
Beam: 27 feet
Displacement: 1,525 tons
Speed: 20 knots

Compiled: July 1951

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U.S.S. CAVALLA (SS244)  DECLASSIFIED

From:  The Commanding Officer:
To:  The Commander in Chief, United States Fleet.
Via:  (1) The Commander Submarine Division 221.
        (2) The Commander Submarine Squadron 22.
        (3) The Commander Submarine Force, U.S.
            Pacific Fleet.
        (4) The Commander in Chief, U.S. Pacific Fleet.

Subject:  U.S.S. CAVALLA (SS 244), Report of War Patrol
Number One.

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

1. Enclosure (A), covering the first war patrol of this vessel conducted in the Eastern Philippine area during the period 31 May 1944 to 3 August 1944, is forwarded herewith.

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U.S.S. CAVALLI - Report of First Patrol.

(A) PROLOGUE

This vessel was placed in commission on 29 February 1944 at the U.S. Submarine Base, New London, Connecticut. During the period 29 February 1944 to 11 April 1944 the following were conducted in the New London, Newport area: Test trials, practice approaches, 5 day patrol, fired contract torpedo trials, deepened and sound tested, received depth charging for incoordination and test of depth charges indicator, fired 6 exercise torpedoes, test fired all guns, conducted special sound evasion runs, conducted special test on auxiliary engine for General Motors and Bureau of Ships to restore tives, in drydock 2 days shifting load ballast in main ballast tanks and loading propeller shefta with dry sand, installed exploded type piston oil wiper rings on all main engines and replaced 3 main engine cylinder liners with chrome plated type.

Departed New London, Connecticut, on 11 April 1944 and made transit of Panama Canal on 20 April 1944. In Balboa, Canal Zone from 20 April to 24 April 1944 for minor repairs. -arrived Pearl Harbor, T.H., on 9 May 1944 and re-ained at Base for minor repairs until 14 May 1944, when training period began. The following were conducted: Inbound convoy exercises, night and day radar runs, day 2nd runs, fired 6 exercise torpedoes, was sound tested and depermed.

The following major work was accomplished in Pearl Harbor area:

(1) Completed installation for charging and ventilating DC 18 torpedoes.

(2) Voice modulation for TBL-12 radio transmitter, ANF-1 radar detector, and variable speed training power for S-J radar mast.

(3) Installed mounts and stowages for two fifty caliber machine guns.

(4) Printed ship modified gray.

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U.S.S. C.WILL. - Report of First War Patrol.

Training was completed on 28 May 1944 and
locating on 31 May 1944. Loaded 6 Kt. 14 Mod.
3L and 10 Kt. 23 forward torpedo room, and
8 Kt. 18 Mod. 1 after torpedo room.

(E) INSTRUCTIVE

31 May 1944

1335 (Vt.) Deported Submarine Base, Pearl Harbor, T.H.

1425 (Vt.) Joined up with escort PC-465.

1544 (Vt.) Submerged in Submarine Sanctusry. Conducted
trim dive, followed by deep dive.

1617 (Vt.) Surfecod.

2017 (Vt.) Escort dismissed; proceeding independently.

1-4 June 1944

05544 (Y) Made contact with air escort on 30 mile
circle from 1day.

0741 (Y) Picked up pilot and stood in channel.

0851 (Y) Escorted port side to U.S.S. HORIZON. The
following work was accomplished:

(1) Received 17,700 ellons fuel oil
and 770 (allone lub oil.

(2) Received 1200 ellons fresh water
and 50 ellons battery water.

(3) Made minor adjustments to SD and S7
raders.

(4) Opened broken cover to 50 caliber
machine gun bridge storage.

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1543(Y) Underway from elongated HOLD and stood out channel.
1706(Y) Clear: channel and set course for area, escorted by two planes.
5 June 1944 Crossed Intercontinental Date Line and skipped this day.
6 June 1944 Ship contact #1. Sighted gray colored submarine, distant about ten miles, on Easterly course.
1156 (1) Submerged. Submarine was not sighted again.
1254 (1) Surfaced. Sent out contact report, and later found out the unidentified submarine was probably the C.B.I.L.T.

7 June 1944 Underway at two engine speed, enroute to area. Conducted drills on the surface. Passed take Island about to port, distant 390 miles.

8 June 1944 Intercepted 500 mile circle. Conducted drills on the surface during day.

9 June 1944 Submerged for trim dive. Exercised crew at drills.

0835 (1) Surfaced.

1045 (1) A slight impact was felt aft, and shortly afterwards a whale broached astern in what appeared to be a pool of blood. No apparent chance in the propeller best nor any additional vibration has been noted, so it is not believed any damage was done to the propellers.

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10 June 1944
0001 (K) Made second radio transmission. Difficulty was encountered in obtaining a receipt. This is discussed under Radio. Due to proximity to Kursus, run on course 90° to left of base course during the transmission.

1030 (K) Passed Kursus aboard to sterboard, distant 110 miles.

11 June 1944
1222 (K) Ship contact #2. Sighted submarines through high periscope dead ahead, hull down, small sterboard angle on the bow. Submerged, went to battle stations, and commenced approach.

1310 (K) Submarine identified as friendly. Fired two recognition smoke bombs, and three minutes later surfaced. Advanced calls with Bowfin and talked with them for about 1/2 hour before proceeding on course towards area.

12 June 1944
0825 (K) Plane contact #1. Sighted at approximately 10 miles, and identified as "Betty". Submerged.

1035 (K) Surfaced.

1103 (K) Plane contact #2. Contacted by SD and sighted by lookout at same time. Unidentified, range 16 miles, and closed to 14 miles before to submerged.

1310 (K) Surfaced.

13 June 1944
0540 (I) Let. 20-46N, long. 139-38E. This area was littered with many small pieces of broken cork. The barostat began to fell and the wind and sea began to pick up during the afternoon. Fearing severe seasick men on board, I decided to dive for evening meal.

1706 (I) Submerged.

1832 (I) Surfaced.

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14 June 1944

0345 (I) Seas increasing, barometer dropping steadily. Took several over bridges and down conning tower hatch, with no serious damage. Slowed to 5 knots. Drafted weather message for ComSubPad, during next couple hours tried without success to get it off.

0622 (I) Submerged. Considered it too risky to remain on surface, due to danger of grounding out machinery below by waves coming over bridge. Furthermore, we were only averaging about 5 knots, which we could nearly average submerged. Attempted to come to periscope depth three different times during day, each time broached, and had difficult time getting back down again.

1621 (I) Surfaced. 14 main engine flooded, resulting in cracked cylinder liner and piston. (See major casualties and defects). Weather had abated slightly, barometer began to rise, and stern was moving to North. Decided not to send another weather message.

1901 (I) Received message about Flying Fish contact and area assignment. Set course for this point, at maximum speed, which was about 12 knots with the present seas.

2351 (I) Storm completely past us. Increased speed to 16 knots to make up for lost time.

15 June 1944

Proceeding towards assigned area at 16 knots.

1900 (I) Entered assigned area. Commenced patrolling across probable route of enemy task force at one engine speed.

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16 June 1944

0720 (I) Ship contact 3. Sighted Pipofish through high periscope, and altered course to close.

0806 (I) Exchanged calls and plans with Pipofish. Pipofish plan was a closing search 5 miles south of estimated track. I proceeded five miles north of track and conducted search normal to estimated track.

1300 (I) Commenced closing search, five miles north of estimated track. Sighted Pipofish during late afternoon.

1955 (I) Sent message reporting negative search and that we were heading for assist-nod area.

2303 (I) Ship contact 4. Radar contact on four ship convoy, bearing 3220 distant 20,000 yards. Commenced tracking to gain position ahead.

2330 (I) Convoy identified as two large ships about 1500 yards ahead, with three escorts, one on starboard flank, one near center of formation, and one astern near port flank. Escorts did not maintain same relative position at all times in formation. We were on starboard bow of convoy. Our best bet second to get ahead of convoy and attack from periscope depth, as visibility was too good for surface attack. Convoy zigging 300 right end left of base course 1200T, speed fifteen knots.

17 June 1944

0315 (I) Gained position 17,000 yards ahead of convoy. Went to radar depth and commenced approach, with stern to convoy. Radar obtained contact at 11,000 yards.

0340 (I) Executive Officer on periscope could make out targets so went to periscope depth. Targets were identified as a medium and large t nkor, with the large tanker on port flank, small pork angle on bow. Changed course for 80 port track, stern tubes on large tanker.

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0355 (I)
Sound reported fast screws just abaft port beam, closing us. Through periscope made out an Lashio class Destroyer heading in our direction, slight starboard angle on bow. Changed course to right 200 for 600 track on tenker to allow destroyer to clear us. Destroyer passed between 1000 and 1500 yards of us, and when it appeared he was clear, shifted periscope back to tanker.

0402 (I)
Had good set up on target, torpedo run about 3000 yaris, with about five minutes to go before firing when sound reported screws on port bow had speeded up. Shifted periscope to port bow, and saw Destroyer heading at us, zero angle on bow, with practically nothing but bow weve showing.

0403 (I)
Flooded negative and went deep. Destroyer passed over us about at the engine room as we passed 75 feet. The then changed course and went up our starboard side. For the next half hour or so he could be heard fairly close, not pinging.

0506 (I)
Surfaced. Noticing in sight, no contacts on radar. Not being sure of what radical zig the convoy might have made, and for the following reasons, decided not to chase: (1) Shortage of fuel. (2) Apparent importance of my getting to San Bernardino Strait as soon as possible. The approach has already delayed me one day. (3) Even if I knew exactly which way they had headed, it would take me about a day at four engine speed to gain position for another attack.

0545 (I)
Sent out contact report to ComSubPac and told of decision to head for San Bernardino.

0704 (I)
Received orders from ComSubPac to chase convoy. Commenced chase immediately at four engine speed and later sent dispatch ticket we were doing so.

1320 (I)
Plene context #3. Unidentified distant about 20 miles. Attched it until it appeared to be closing.

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1333 (I)
: 1439 (I)
: 1530 (I)
: 1627 (I)
: 1644 (I)
: 1733 (I)
: 1741 (I)
: 1900 (I)
: 1957 (I)
: 2015 (I)
: 2018 (I)

U.S.S. CAVALIA Report of First War Patrol.

Submerged to avoid detection.
Surfaced, and resumed chase.
Plane contact #4. Unidentified, distant about 14 miles closing. Submerged.
Lat. 12-35 N, Long. 131-50 E. Heard five distant depth charges or bombs.
Surfaced, and resumed chase.
Received new area assicment from Commander Submarine Pacific.
Plane contact #5. Sighted at approximately 5 miles heading in. Identified as "Betty". Submerged.
Surfaced.
Ship contact #5. Radar contact bearing 2400 distant 30,000 yards. Zip seemed to fade in and out at this range, so put bow to contact and went to four engine speed. It didn't take very many minutes for range to commence closing very fast, so reversed course putting stern to contact. At 22,000 yards other pips began to appear on radar.
Following was estimate of situation: Our contact was a large task force, zigzagging between 0600 and 1000, speed 19 knots. Seven good zip wire showing, indicating a very large ship, probably a carrier, on the starboard flank, flanked on the port quarter by two columns of three ships each, probably battleships or cruisers.
Range to carrier, which was closest ship, 15,000 yards. Although the night was fairly dark, this ship could be seen and looked mighty big. We were in position on the track ahead of the formation, so submerged to radar depth and went to battle stations.

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2029 (I)
The sevOn large conTacts were picked up by radar, range 10,000 yards. However, sound gear began to pick up screws of at least 15 different ships, evidently destroyer escorts not detected by radar. By now it was apparent that we were on the track of a large, fast task force, heading some place in a pretty big hurry. Since we had no knowledge of a previous contact report on this task force, it was decided to abandon the attack, and surface as quickly as possible in order to send in a contact report. This was a tough decision to make, because the Carrier which we had been tracking on TDC, tracked very nicely on courses 1000 speed 19 right up to the time it passed us by

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19 June 1944

0055 (I) Discontinue chase and change course to head for previously assigned patrol station. At target to set range off at this time with no success.

0345 (I) Plane contact #7. Unidentified plane dived low over ship. It was not sighted, but the rear of its engines was heard in the Conning Tower as it passed. The Officer of the Book, Itched. Cessar was white as a ghost. The practice of speaking when I reached the control tower was not uncommon. The old sea craft were not uncommon.

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1048 (I)
Ship contact #6. Sighted masts of ship directly under planes, starboard angle on bow. JP picked up screws of other ships not in sight. Came to normal approach course and went to battle stations.

1052 (I)
When I raised my periscope at this time the picture was too good to be true. I could see four ships, a large Carrier with two Cruisers ahead on the port bow and a Destroyer about one thousand yards on the starboard beam. The Carrier was later identified as Shokaku Class, and the Cruisers as Atego Class. The angle on the bow of the Carrier was about 250 starboard.

1100 (I)
I could see that the Destroyer on the Cruiser's starboard beam might give me trouble, but the problem was developing so fast that I had to concentrate on the Carrier and take my chances with the Destroyer. Unmoved for 9:00 starboard track but two 1.1 knots. I let the Executive and Gunnery Officer take quick look at target for identification purposes. The target mounted a large "bod spring" type radar mast on top of formast, and was flying a large deep-ansae casing. Then sighted and during attack she was in the act of taking on aircraft of the small single on-line low wing type. At the time of attack only one plane was seen left in the air, and the forward part of her flight deck was jammed with planes, my guess at least thirty maybe more.

1118 (I)
Flood spread of six torpedoes; 125% divergent spread, set at 15 1/2st, torpedo ran 1200 yards. Angle on the bow of the Destroyer was zero, range about 1500 yards. After firing fifth torpedo flooded negative and went deep, firing the sixth on way down. First torpedo hit at 50 seconds, and the second and third at 8 second intervals after that. The last three torpedoes missed. Put rudder left and rigged for depth charge and silent running.

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1120 (I)
Two salvos of four depth charges fairly close, first salvo ahead, above and to port, and the second salvo ahead, above and across from port to starboard. For the next three hours 106 depth charges were dropped, 56 of which were fairly close. Evaded at deep submergence. The boat became very heavy and it became necessary to run at 60 IPM with a 40 up angle. Damage is listed under: Major Defects and Damage.

1144 (I)
High speed screws passed directly overhead and were heard throughout ship. However, no close charges were dropped on this run. Three Destroyers worked on us at first, and after about 13 hours only one Destroyer was left. At no time was piping heard.

1330 (I)
Depth charges began to get further away, but remained between us and scene of attack. About this time JP, which was the only sound gear we had left, began to report loud water noises in the direction of the attack.

1352 (I)
Commenced planing slowly up to periscope depth. Intermittent distant depth charging could still be heard, as could loud disturbance still be heard by JP in direction of attack.

1408 (I)
Four terrific explosions were heard in direction of attack. These were not depth charges or bombs, as their rumbling continued for many seconds.

1421 (I)
Periscope depth. Nothing in sight, visibility poor due to rain squalls all around.

1429 (I)
Secured from depth charge and silent running.

1527 (I)
Secured from battle stations and commenced torpedo reload. 56 torpedo tube was found to have a sheared stop bolt. (See Major defects and Damage).

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0934 (I) Slighted what appeared to be an airplane expendable type gasoline tank floating vertically in water. It appeared to be made of pressed sheet steel, halves joined by longitudinal seams, painted white with irregular red markings. It was dotted and slightly rusty.

2055 (I) Commoned conversion of #4 F.B.T. to ballast tank. The gaskets on the vent valves wore badly corroded and wore replaced by now gaskets.

23 June 1944

0053 (I) Complicated conversion of #4 F.B.T. Flooded and blew tank several times to wash it clear of fuel oil.

0333 (I) Submerged for purpose of completely flushing out #4 F.B.T. by blowing and reflooding.

0313 (I) Surface.

0615 (I) SD radar out of commission. The cause was later found to be due to failure of the high voltage transformer for radar receiver indicator. Spare transformer not on call now list.

0725 (I) Submerged to work on SD radar.

1200 (I) The SD was jury rigged, using an oscilloscope for the receiver indicator. Range calibration was uncertain.

1210 (H) Surface.

1221 (H) Flare contact #13. Radar contact, 12 miles, not sighted. Scorched carefully but was un-able to find plane. Radar reported contact closing.

1223 (H) Fubmorged. Apparently the oscilloscope is working, but the radar technicians seem to think ranges are much in error. Will check this against land the first opportunity I get.

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1606 (H) Surfaced.
: 1930 (E) Crashed all topside fittings.
: 24 June 1944
: 0521 (H) Submerged in latitude 13-16N, longitude 126-53E. Due to uncertain performance of SD, decided to make all day dive in order to reach San Bernardino undetected.
: 1825 (H) Surfaced. Nothing sighted during day.
: 25 June 1944
: 0439 (H) Submerged 29 miles off Capo Espiritu Santo, Spicer Island. Patrols towards this point, thoroby covering shipping routes from San Bernardino Strait and up the East coast of Scarr Island.
: 1115 (H) Sighted lighthouso on Batag Island. No shipping sighted during day. Patrols to slow spood on once engine during night.
: 1902 (E) Surfaced 15 miles off Batag Island. No shipping sighted during day. Patrols to slow spood on once engine during night.
: 26 June 1944
: 0442 (E) Submerged 21 miles from Unger Point lighthouso on Rcpu Rcpu Island. Closed the Island and patrols in its vicinity rll day, thoroby covering any shipping out of San Bernardino Strait or L'gonoy Gulf.
: 1122 (E) Sighted what might be a r.rdar nrst on Montufar Point, Luzon. It was rocrngulr in shcpc, stood well cbovo tho surrounding trocs, and cpporrod to bo supported by c. single nrst. As twilight set in, covercl bright fires wore visible on tho borchos.
: 1501 (H) Surfaced 20 miles off Unger Point. Hordod to Enstward to got color of land during bright moonlight, and to put in battery ohrgc.

- 15 -

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2050 (E)
Ship contact #7. Kadar contact bearing 160°T.
distant 18,000 yards. Commenced tracking from
astern on #1, 2 and 3 main engines. We engine
out of co.mission. (See Major defects and
damage).

2113 (H)
Estimate of situation. We were on port bow of
eight ship convoy, four of which were escorts.
Convoy was zigging between 3150T and 0250T,
making 15 knots. This course would just pass
them clear of the 100 fathom curve off Cat-
anduanes Island. Escorts were patrolling
around convoy, maintaining no special station.
Our position northwest of convoy at this time
was unfavorable for following reasons:
Although sky was about 80% overcast a bright
moon was out at intervals making targets
visible at 14,000 yards; we were between
moon and target; lightning at irregular
intervals all around horizon; had indications
of radar in target group; we were too far
from track to make submerged approach; we
would have to get around to starboard bow
of target in order to clear 100 fathom
curve off Cateanduanes Island. Commenced end
around on target staying outside of 16,000
yards, and hoping we would not be detected
by radar.

2238 (E)
Re. check position on starboard bow of convoy,
about 4000 yards off track of base course.
Moon was down but visibility was good, with
lightning at intervals around horizon.
Having only three engines, and due to more
indications of convoy having radar, decided
against surface attack, and came to follow-
ing decision: To submerge end attempt radar
and periscope attack, hoping to be able to
see convoy through periscope silhouetted by
lightning. If this failed, to surface as
soon as possible and get in position for
dawn at.ack. Slowed to 1/3 speed and put
bow to convoy.

2249 (E)
Submerged to radar depth with target range
13,500 yards. Intermittent echo ranging
could be heard on 24 KC.

— page 24 —
2306 (H) 4th target range 5400 yards went to periscope depth. We were about 1000 yards off starboard track of convoy. Intermittent pinging still heard.

2310 (H) Indication by sound of target zig to left. Nothing could be seen through periscope. Decided to open from track, surface, and make end around for dawn attack. Didn't want to take chance of wasting torpedoes on a bad set-up.

2348 (H) Surfaced. Target group was bearing 3100T distant seven miles. Commenood and around on three onginos at maximum radar range, which was about 11 miles.

27 June 1944

0020 (H) Sent contact report to Commander Submarines Pacific. Transmission took 16 minutes.

0400 (H) We were in good position, 11 miles on starboard bow of convoy. Convoy had tracked all night on base course 3400T, speed 15 knots. As dawn was beginning to break decided to open out to about 12 miles, and after target group was sighted and no apparent radical zig made as its chief custom, to submerge and make attack.

0410 (H) Just outside of radar range of convoy. Beginning to get light, but nothing in sight. High periscope manned.

0428 (H) Heavy rain squalls between us and convoy. Changed course to left to close track and search with radar. Convoy was never again picked up, having made a radical zig either right or left. Due to previous tracking assumed convoy to be head-ing towards northern tip of Luzon, and had changed course to hug coast during the day. Changed course normal to convoy's original tracked course, and headed towards coast of Luzon.

— page 25 —
1000 (H) Changed base course to North, and searched hourly 30° right and left of this course. Slowed to 3 engine speed.

1452 (H) Sighted land bearing 2700T, range 30 miles.

1800 (H) Land bearing 2500T, distant 24 miles.

1804 (H) Ship contact 5E. Sighted what appeared to be Sempan through high periscope, dead ahead, distant 10 miles. Decided to investigate before dark, and sink with gunfire if any Japs on board. Heeded towards Sempan at high speed.

1620 (H) Ran into electrical storm. Heavy rain, visibility less than 500 yards.

1651 (H) Getting dark, still raining very hard, visibility poor. Discontinued search for Sempan. Could be unable to identify occupants now even if we found it.

1900 (H) Changed course to South, returning to Sen Bernerdino. Slowed to one engine speed.

2005 (H) Sent message to Commander Submarines Pacific reporting that we had lost convoy and were returning to patrol station. Electrical storm and heavy rains continued all night.

26 June 1944 Ran out of electrical storm about dawn. However, ran through intermittent rain squalls all day. Remained on surface all day.

1830 (H) Sighted Catawbanes Island bearing 2470T distant 25 miles.

2000 (H) Received two messages from Commander Submarines Pacific. The first telling us to conserve fuel and remain on station as long as possible, and the second to proceed to Saipan at best speed. Changed course to head for Saipan and went ahead standard on four main engines.

2030 (H) Sent message to Commander Submarines Pacific giving 35T. Rendezvous.

— page 26 —
29 June 1944
Proceeding at four engine speed to Saipan. Sighted several oil drums during the day. No ships or planes sighted.

0721 (H) Received orders from Commander Submarines Pacific to change rendezvous time to insure meeting our escort during daylight.

1133 (H) Comploted transmission to Commander Submarines Pacific giving now rendezvous time.

30 June 1944
0728 (I) Submerged for trim divo. Faulty operation of the outboard exhaust valve on #1 main engine resulted in the flooding of this engine. Luckily, no damage was done. (See Major Defects and Damage).

0842 (I) Surfaced.

0905 (I) Plane contact #14. Radar contact at 18 miles. This contact persisted for 27 minutes, the range varying from 16 to 18 miles. Not sighted. Remained on surface.

2105 (I) Received message from Commander Submarines Pacific giving name of escort.

1 July 1944
During the day sighted much debris, including at least 30 oil drums.

0834 (I) Sighted airplane expendable gas tank. Attempted to pick it up, but after several tries gave it up as a bad job.

1001 (I) Plane contact #15. Sighted, bearing about 90° relative, distance 12 miles. At this time thought it might be friendly, but later identified it as type "Sally". Plane was on parrllol course, and remained very close to horizon.

— page 27 —
1008. (I)
Plane was broad on our starboard bow. It this time it changed course and headed directly for us. Lighted both flares and commenced sending recognition signal with

1011 (I)
With range down to cbout five miles and plane still giving us a zero angle on the bow, the Executiv Officer, who was on the per- iscope, reported plane appeared to be firing. Submerged. Is we passed 100 feet explosive bullets would be herd through boat, and tho Iftor Torpodo Room reported hearing a light bomb explosion. This plane was not pluked up by rcdcr.

1054 (I)
Periscope do:th. Nothing in sight.

1128 (I)
Surf:acod.

1148 (I)
Unc:blo to gat Commcndor 5th Floot di:rect, so transmitted plane contact to Commander Sub- marinos Pc:sfie, or action Commander 5th Floot.

1239 (I)
Plane contact #16. Sighted just abaft starboard beam, distant about 12 miles. Looked like same type plane that fired on us earlier. Changed course 200 to left to open out, and kept our eyes on him.

1259 (I)
Plane disappeared, heading away from us, range about 20 miles. Resumed base course. Plane was not pluked up by rcdar.

1506 (I)
Investigated wreckage of small wooden ship.

1522 (I)
Investigated wreckage of another wooden ship.

1622 (I)
Investigated wrecked wooden Japanese Sampan, which was lying partially awash with port bow visible cbove w:ctor. Large Jap symbols wore painted on bow, and several shoil holos wore visible in hull. No sign of life.

— page 28 —
1714 (I) Ship contact #9. Sighted escort bearing 0980T, distant about 14 miles.

1727 (I) Exchanged calls with U.S.S. PHILIP (DD 498).

1739 (I) Fell in astern of escort, established voice communication, and proceeded towards Saipan ct 16 knots. He warned us that there was lots of wreckage here on in which made navigation dangerous.

1 July 1944

0247 (K) Plane contact #17. Passed overhead from port to starboard. Heard but not seen.

0315 (K) From here on in we had radar contact on many ships. Our escort had previously told us we were passing close to friendly ships who know of our presence.

0510 (K) Ignored the two 20 MM and two 50 caliber guns. Selpin and Tenian Island in sight. Flares and bomb bursts had been soon for the last hour in the direction of both islands.

0530 (K) It was now light enough to see a scene which we will not soon forget. Practically every type ship in the book was in sight. A large column of smoke hung over the Northern end of Saipan, caused mostly by an oil fire near the town of Garapan. Gunfire and bomb explosions could be seen on Saipan, and bomb and shell bursts could be seen on Tonian. We had expected to fuel in Magdolino Bay, but as we had not expected to find it, ships of all descriptions came into sight, anchored off with was left of the Sugar Hill on the Southwest side of the Island. In this "transport anchorage" there were cruisers, destroyers, transports, freighters, tankers, repair vessels, 2 hospital ships, and landing craft of all descriptions.

— page 29 —
0630 (K)
Entered the anchorage area, and proceeded slowly while awaiting orders from SOPA. .bout this time our first real glimpse of the"show" came when we saw one of our bombers shot down over Garapan. The pilot "hit the silk", and appeared to land right in Cearpan. Shortly afterwards we wore contacted and welcomed by Commander Task Force 51, and were told to proceed to the U.S.S. SAUMICO for fueling. Lieutenant Commander Francis, from Commander Task Force 51 Staff came aboard, and offered us the services of the entire fleet present. After we notified him of our ncoads he loft to got things started. What a reception and what sorvico!

0758 (K)
Moored port side to starboard side of U.S.S. SAUMICO, one mile off the Island of Saipan. Maintained steaming watches, and kept all machine guns manned. We were only at night, but occasionally the Japs on Tanian had let loose with a salvo in the direction of the Anchorage. A couple of ships had boon hit a few dcys before. To discourage the gunners on Tenian, one of our Cruisers plus several Destroyers bombarded them all during our stay. Every now and then the bombardrnent stopped long enough to let our planes drop a few bombs.

1044 (K)
On orders from Commander Tusk Force 51 got underway from alongside U.S.S. SAUMICO and proceeded to the U.S.S. KENNEBAGO to complete our fueling. Received 19,000 gallons from SAUMICO.

1109 (K)
Moored starboard side to port side U.S.S. KENNEBAGO and resumed fueling. Crdors were received from Commander Task Force 51 to depart at 1700 (K).

— page 30 —
1310 (K) Representative from the Staffs of Admiral's Spruance, Turner and Hill plus six War Correspondents and a photographer came on board. For the next hour I was swamped with questions.

: 1419 (K) All visitors left the ship.

: 1650 (K) Made preparations for getting underway. The following was received during our stay in Saipan: 70,000 gallons fuel oil, 1700 gallons lub oil, 2500 gallons fresh water, SD Radar transformer, a few provisions, one min engine lub oil pump and one min engine cylinder liner. The following work was accomplished: SD Radar back in commission, #4 fuel ballast tank reconverted for use as fuel tank, holo in #3 main engine muffler patched by welding, topside thoroughly greased, top side paint work touched up, despatch sent to Commander Tesk Force 51 for transmission to Commander Submarine Pacific giving information for Submarine notice.

The stay in Saipan was one of the most interesting experiences I have ever had. We were only a mile from the beach, and had a ringside seat for one of the toughest fights our marines have had to date. Units of our fleet bombarded Scipan all day without a let-up, and their much-smashing was amazing. The Island seemed to tremble under the blasting they gave it. The dive bombing of our planes was thrilling to watch, and to top it off, at times you could see our marines ashore with their tanks and flame throwers giving the Japs hell. With all this going on within our sight the Cavalla forgot the war long enough before leaving to hold "swimming call" about two hours.

The reception we received on arriving at Saipan, and the services while there left us feeling damn glad we are Americans, and mighty proud to be members of the United States Navy.

— page 31 —
1706 (K)
U.S.S. CAVALIA Report of First War Petrol.
Underway from alongside U.S.S. KENNERAGO and joined up astern U.S.S. PHILIP (DD 498). As we were leaving, the Cruisers shelling Tenian evidently made a direct hit on the airfield gasoline tanks, because a very large fire was started which could still be seen soveral hours later.

3 July 1944
0548 (K)
Escort departed after exchange of signals. Proceeding indepondently towards San Bor-nardino at throo ongino spood.

0618 (K)
Submerged, conducting trim dive.

0650 (K)
Surfaceed.

0726 (K)
Plane contact #18. Sighted bearing 0200T, distant 12 miles, on parallel course. Identified as a PBM. Picked up by radar as it passed abeam, distant 10 miles.

0749 (K)
Plane disappeared about broad on port bow. No attempt to exchange recognition signals.

1324 (K)
Plane contact #19. Sighted bearing 1630T, distant 12 miles, on parallel and opposite course. Identified as a PBM. Not picked up by radar.

1335 (K)
Plane disappeared in clouds. No attempt made to exchange recognition signals.

1539 (K)
Sighted aircraft wheel complete with tire and retractable landing gear strut. Commenced maneuvering to pick it up.

1549 (K)
Picked up wheel, and felt better when name plate identified it as Japanese. The wheel was attached to the wheel fork, shook absorber strut and sheet metal flap common to retractable landing wheels which fold into the wings of an aircraft. The Whool had apparently boon shocred off when the plane crashed at sea. Commenood dis-mantling and striking below for possible future valuo.

- 24 -

— page 32 —
1619 (I) While dismantling the shock absorber, it suddenly came apart throwing piston and cylinder ends in opposite directions with great force. Ryan, L.E., BMLo.; received severe lacerations of both legs, and Verkerk, O.V., CMOM(A), received severe lacerations of lower leg. Both were treated by pharmacist's mate and placed on binnacle list.

1720 (I) Sighted very large metal tank, over half submerged, which could not be identified, so sank with 20 MM fire.

4 July 1944
Underway at three engine speed on surface all day. Slowed to one engine at dark so that we would be sufficiently far from San Bernardino 60 mile circolo tomorrow night to permit conversion of #4 F.B.T. Hoon is now full.

5 July 1944
Complotod a battery oqualing charge.

1943 (H) Commenced converting #4 F.B.T. to a ballast tank.

2039 (H) Completed conversion of #4 F.B.T.

2125 (H) Submerged for purpose of flushing out #4 F.B.T. Power cables on QB sound gear were cut while lowering head, putting it out of commission.

2215 (H) Surfaced.

6 July 1944
QB sound gear back in commission.

0040 (H) Sighted peak on Luzon bearing 2420T, distant cbout 60 milos.

0534 (H)

— page 33 —
0607 (H) Submerged. Conducted periscope patrol covering approaches to San Bernardino Strait.

0635 (H) Put hydraulic plant out of commission and gave it a much needed overhaul.

1500 (H) Hydraulic plant back in commission.

1849 (H) Surfaced. Full moon. Patrolled at slow speed on surface during night in vicinity of Strait.

7 July 1944

0440 (H) Submerged off Ungay Point, Rapu Island.

1854 (H) Surfaced. Scattered brush fires seen on beach during day, no shipping.

8 July 1944

0428 (H) Submerged. Conducted periscope patrol about 10 miles off 100 fathom curve off entrance to San Bernardino.

1847 (H) Surfaced. No sign of life during day except on beach. The full moon at night made visibility practically unlimited.

9 July 1944

0318 (H) Ship contact 10. Radar contact, bearing 900 relative, distant 900 yards. Not sighted. Bright full moon, visibility unlimited. Increased speed, and changed course to put contact astern. Intermittent contact was maintained until range increased to 1700 yards, at which time contact was lost. True bearing at that time had changed to the right. Both the Navigator and radar technician reported it was a good contact. It is believed that it might have been a submarine periscope.

— page 34 —
0437 (H) Submerged. Conducted patrol south of Catanduanes a.nd off Legonoy Culf.

1847 (H) Surfaced about 25 miles off hapu Island. No shipping sighted during day. On surfacing a rather bright light was seen on the south tip of hapu Island, which at intervals for the next hour, appeared to be signalling. Patrolled at slow speed during the night, covering the approaches to San Fernando.

10 July 1944

0454 (H) Submerged. Conducted patrol off Batang Island.

1651 (H) Surfaced. No shipping sighted during day. Shortly after surfacing the loom of a powerful white light was seen for about two minutes over Cape .spiritu Santo.

1954 (H) Received message from Commander Submarines Pacific.

2100 (E) Sent message to Commander Submarines Pacific giving information requested.

11 July 1944

0426 (E) Submerged off entrance to Lagonoy Gulf. Decided to take a look inside. A little difficulty with currents was encountered inside.

1157 (H) Reached a point about ten miles inside Gulf. Sighted a sampan off hapu Rapu Strait, and two sail boats further in Gulf. I think a petrol all the way in, especially off Tabaco Harbor, might be profitable. Hope to get the opportunity before we leave. My orders at present prevent it. Reversed course to head out of Gulf.

1710 (H) Cleared entrance to Lagonoy Gulf.

— page 35 —
1849 (H)
While making preparations to surface sighted a steady bright white light on Bingay Point.

1856 (H)
Surfaced 12 miles off Rapu Island. Several lights were sighted on Bingay, Rapu and Cataudunues.

1955 (H)
Radar contact bearing 300 relative, distant 350 yards. Swung hard left, and increased speed. It was very dark, visibility not too good. Contact was lost bearing 1800 relative, distant 750 yards. Nothing was sighted from the bridge.

2016 (H)
Resumed base course and slowed to pat-rolling speed. Received message from Commander Submarines Pacific telling us to remain where we are.

12 July 1944
0442 (E)
Submerged. Conducted patrol covering entrance San Bernardino.

1855 (H)
Surfaced. Same flashing white light as has been seen on previous nights was sighted on Rapu Island.

1931 (H)
Received message from Commander Submarines Pacific saying convoy of two ships and three escorts came through San Bernardino yesterday morning. Damn the luck. At that time I was investigating the possibility of ships hugging the coast and using Lag-ony Gulf.

13 July 1944
0433 (E)
Submerged. Conducted patrol covering entrance to San Bernardino, near 100 fathom curve. Strong currents, especially during changes of tide, have been noted here. Also, a good temperature gradient.

— page 36 —
1854 (E)
- Subj: U.S.S. CAVALIA Report of First Patrol.
- Surfaced. No shipping sighted during day. Some lights visible on beach as on previous nights.
- 14 July 1944
- Submerged. Conducted patrol covering entrance to San Bernardino.
- 1013 (E)
- Ship contact #14. Sighted sail boat bearing 2690T, distant 5 miles, heading from Bingay Point towards Cape Espiritu Santo.
- 1103 (H)
- Sail boat passed close board. It was identified as a 'Villpino "Vinte", about 30 ft long, with eight men aboard. The men appeared to be fishing, and nothing suspicious was noted about the boat. In another hour it was out of sight.
- 1852 (H)
- Surfaced. Same lights sighted as before.
- 1907 (E)
- Received message from Commander Submarines Pacific prolonging our stay on patrol, as we requested.
- 15 July 1944
- Radar detector picked up weak contact on 155 megacycles, which was received at approximately one minute intervals. Annned the "SP" Radar, and keyed every minute.
- 0448 (H)
- Submerged. Radar detector had continued to pick up indication up to this time. No contacts or interference noted on "SP". Conducted patrol covering entrance to San Bernardino.
- 1902 (H)
- Surfaced. Received orders from Commander Submarines Pacific to shift patrol station to North tomorrow night.

— page 37 —
2221 (H)
Closed Rapi Island to about 10 miles to investigate bright white light which has been seen every night. Unable to identify it, but feel sure it is used for Navigation purposes. It is a steady bright white light, on the high point at southern end of Rapi. Radar detector connected picking up interference at approximately one minute intervals on 155 megacycles.

16 July 1944
Submerged off Nagumbuaya Point, Catanduanes Island. Strong negative gradient, also strong current in this vicinity.

1853 (H)
Surface. Set course for new area passing about 10 miles outside 100 fathom curve off East coast of Catanduanes Island.

17 July 1944
Conducted surface patrol at two engine speed. Sky overcast, with intermittent rain squalls during day.

1506 (H)
Sighted mountains on East coast of Luzon, distant about 37 miles.

1528 (H)
Changed course to head out from land.

1854 (H)
Slowed to night patrol speed. No shipping sighted during day.

18 July 1944
Conducted surface patrol at two engine speed.

0731 (H)
Sighted mountain range, near Casiguran Bay, Luzon, distant 55 miles.

0745 (H)
At this time we were 40 miles off shore, so reversed course and patrolled to Eastward.

1200 (H)
Reversed course and headed back in towards land.

— page 38 —
1445 (E)
Ship contact #15. Sighted Sampan, bearing 2200T, distant about 10 miles. Changed course to close and investigate.

1530 (H)
When the Sampan sighted us she put her stern to us and attempted to escape. She was identified as about a 50 ton vessel, with hatch for. and cabin and engine aft. Closed to about 500 y.rds to make sure our contact was Jcp. She was readily identified at this range, having a rising sun printed on each side of pilot house, Jcp charcters on the bow, glass net flots on the ocin top, and eight to ten Japs standing around on deck. Fired a clearing charge through the 4" gun, and all the Jcps disappeared below. Opened fire with 4" gun and machine guns.

1620 (H)
Nothing left of Sampan except a mess of shuttered timbers, sections of dock, and glass bells floating in a large oil slick. Sixton hits out of nineteen had boon made with the 4", and it had boon completely red with machine gun fire. Five Jcps wore in the water clinging to the wreckage, and how they survived I'll never know. I'm, Y., 2J3C, U.S.N.R. a Korean-American, called to the Jcps in their native tongue and told them to come aboard, but they would not accept the invitation. We did not approve too close because of danger of fouling servos with nets or other wreckage; and so without obtaining a prisoner, deportd seone of attack about 1700.

Fierly heavy soos wore oncountorod during the cttock, and at 1540 (H) a large wave washed over our forward dock, knocking the gun crew off their irot, but luckily, no one was washed overboard. However, two men wore injured: Bclsloy, Louis A., 2J3C, recoviod a strinoed loft log and ankle, and McGuirk, Thomas P., 52c, recoviod multiple i.corctions of right foot and left thigh. Both men were treated by the pharmcist's medic.

— page 39 —
2040 (H) Picked up indications of another radar on 155 megacycles. This indication was picked up at intermittent intervals during remainder of night.

19 July 1944

0450 (H) Submerged. Conducted patrol between Polillo Island and Cape Enconto, Luzon.

1500 (H) Plane contact #20. Sighted twin engine bomber, type "Betty", through periscope, bearing 1100T, distant about 1 mile, on a northerly course.

1615 (H) Ship contact #16. Sighted Sampan, bearing 2220T, in close to beach. It soon disappeared from sight.

1900 (H) Surfaced. Proceeded at high speed up East Coast of Luzon, varying course to remain between 20 and 25 miles off beach.

20 July 1944

Although we covered practically the whole East Coast of Luzon last night and this morning, no contacts were made.

0446 (H) Submerged about 25 miles off Diligan Point. Heeded in towards beach.

1216 (H) Ship contact #17. Sighted motor driven Sampan, heading out to sea. It passed us about 1 mile, and the "Rising Sun" could be seen on side of deck house. As we were only about 12 miles of the beach and it was still early in the day, decided not to surface and sink it.

1600 (H) Set course away from beach and in direction Sampan had disappeared. Decided to surface and attack if it was sighted again.

1858 (H) Surfaced in high seas and increasing wind. It is beginning to look like that typhoon we have been warned about is not far off. The Sampan was not sighted again.

- 32 -

— page 40 —
21 July 1944
0450 (H) Submerged about 20 miles off Palanan Point. Headed in towards beach. Soas and wind increasing.
0731 (H) About 11 miles from beach, visibility very poor. Kevorsod course to head out from beach.
1854 (E) Surfaced in very hicky seas and wind, poor visibility. Opnoad out from land for surfaco patrol tomorrow.
22 July 1944 Conducted surface patrol in hicky seas and through intermitant hicky rain squalls. Covored possible sea routes from Ampiro to Philippines and Southern Islands.
23 July 1944 Conducted surface patrol in scmo vicinity as yostorday. Wind and sea dooreasing visibility excellent.
1930 (H) Inclovid orders to terminate patrol on 25 July.
24 July 1944 Conducted surface patrol to about 80 miles off Iuzon. Nothing sighted.
25 July 1944 Conducted surface patrol, enroute lastern limit of area.
2000 (I) Departed area. Enroute Iajuro.
2200 (I) Sent despatch to Commander Submarines Pacific, acknowledged his despatch, and gave results of patrol.
26 July 1944 Underway on surface, enroute Iajuro.

— page 41 —
1952 (I) Sent working party on deck to convert # 3 F.B.T. into a main ballast tank.
2141 (I) Submerged to flush out #3 main ballast tank.
2206 (I) Surfaced. Resumed course and speed, enroute Majuro.
27 July 1944 Underway on surface, enroute Majuro.
0959 (I) Plane contact #21. Sighted by lookout bearing 210°T, unidentified, distant 12 miles, heading towards us. Surmmerged.
1112 (I) Surfaced. Resumed course and speed, enroute Majuro.
28 July 1944 Underway on surface, enroute Majuro.
0745 (I) Plane contact #22. Sighted bearing 0700T, distant 14 miles, crossing bow from starboard to port. It locked like a PBY. Remained on surface.
0800 (I) Plane disengaged from sight.
1018 (K) Plane contact #23. Sighted bearing 2640T, distant 16 miles, crossing stern from port to starboard. Locked like some plane previously sighted. Remained on surface.
29 July 1944 Underway on surface, enroute Majuro. Sent rendezvous message.
30 July 1944 Underway on surface, enroute Majuro.
31 July 1944 Underway on surface, enroute Majuro.
0518 (L) Picked up radar interference on SJ, apparently caused by a rotating type antenna. Not picked up by Radar Detector. Though not sighted, believe this was probably the Pilotfish. We were in heavy rain squalls at this time.

— page 43 —
U.S.S. CAVALIA  Report of First War Patrol.

(C)  WEATHER

Enroute to station ran into rough seas and overcoast skios.  On 14 June we wore on the southern edge of a typhoon and encountered mountainous seas and strong winds.  In gonorral, the weather in area was good.  Frequent rain squalls wore experienced.  From 17 to 22 July we wore on the outer edge of another typhoon, encountering very heavy seas, much rain, and strong winds.  Ran into intermittent rain squalls and overcoast skies on trip home.

(D)  TIDAL INFORMATION

The currents outside of the 100 fathom curve near San Bernardino Strait conform to the tidal changes in the strait, that is, the sea is Southwesterly on the flood and Northeasterly on the ebb.  These currents vary ranged from 1.0 to 1.5 knots.  The current along the East Coast of Luzon follows in gonorral the contour of the coast, converging about 1.5 knots Northwesterly.

(E)  NAVIGATIONAL AIDS

No navigational lights were observed.  Repu Repu Island is an excellent landmark to keep strait on in peril.  San Bernardino Strait.  Other prominent landmarks are the 1481 foot range in back of Cepo Espiritu Santo, Mt. Capctean which is dome shaped, and Bulusan Volcano which towers above everything and is very conspicuous.  Catanduanes Island was usually visible, but is not much help for navigation, as the trawnts taper off very gradually and the packs are difficult to identify.

— page 46 —
U.S.S. C.V. LIL. Report of First War Patrol.

(C) .INTROFT CONT.CTS

CONT.CT NUMBER: 1 2 3 4

Date: 6-12-44 6-12-44 6-17-44 6-17-44
Time (Zono): 0825(K) 1103(K) 1320(I) 15.0(I)
Position: Lat. 22-01 N 22-01 N 12-42 N 12-36 N
Long. 144-07 E 143-54 E 131-33 E 131-46 E
Spoed 15 kts. 15 kts. 13 kts. 14 k.s.
Course 2450T 2820T 1150T 1200T
Trim Surfaco Surfaco Surface
Minutes Since Last
SD Radar Search

Numbor 1 1 1 1
Type: Botty Bubs Navis Unk.
Probable Mission: Transit Pat. Fet. Pat.
How Contacted: sight Slight&D Slight Light
Initial Range: 5.1lcs 16.1lcs 14.1lcs 10.1lcs
Elevation Angle: 12° 8° 10° 3°
Range & Latitude: ND ND ND ND
Bearing of Plane: When It Detected
S/M

(C) (

— page 47 —
U.S.S. CAVALIA  Report of First War Patrol.

(G)  AIRCRAFT CONT. CTS

CONTACT NUMBER: 5  6  7  8

Date: 6-17-44  6-18-44  6-19-44  6-19-44

Time (Zone): 17A1(I)  1608(I)  0354(I)  0522(I)

Position: Lat. 12-28 N  12-43 N  12-20 N  12-15 N

Long. 131-6C-E  137-15 E  138-54 E  138-43 E

Speed 14 kts. 18.5 kts. 18 kts. 18 kts.

Course 1200T  0600T  2350T  2350T

Trim Surface   Surface   Surface   Surface

E. .imtots Since Last  -  8 hrs.  0

SD Radar Search

Number 1  1  1  1

Type  Betty  Betty  Unk.  Unk.

Probable Mission  Fdt.  Enroute  Unk.  Unk.

How.Contacted  Slight  Slight  Sound  Radar

Initial Range 8 .11lcs  20 .11lcs  1000 yds. 6 milos

Range & Relative 8 .11lcs  ND  1000 yds. ND

Bearing of Plane 2800  2700

When It Detected

S/ti

(State (Beau-

Sea:  fort)  2  1  1  2

(Circulation (Rel)  2800  0300  2700  2700

Visibility (Hilos)  20  25  0.5  10

(Hight in Ft.  8000 ft.  4000 ft.  2000 ft.  500 ft.

Clouds: (Forcent  10%  40%  60%  95%

(Ovcreast

(Bearing (Roi)  Day  Day  Ho  Day

Moon: (nglo  Icon

(Forcent

Illum.

— page 48 —
U.S.S. C.V.I.L. Report of First Patrol.

(G)  .I.C.R.F.T CONT.CTS

CONT. CT NUMBER    9    10    11    12
Date    6-19-44    6-19-44    6-20-44    6-22-44
Time (Zone)  1012 (I)  1039 (I)  0810(I)  0701(I)
Position:  Lat.   11-50 N   11-49 N   10-16 N   11-13 N
Long.    137-57 E   137-56 E   136-08 E   138-20 E
Speed    16 kts.   2 kts.   2 kts.   14 kts.
Course    2350T    2350T    1950T    3020T
Trim    0    27    2 hrs.
...minutes Since Last
SD Radar Search    0    30 mins.

Number    1    4    1    1
Type    Unk.    Kato    Unk    Kato
Probable Mission    Unk.    Landing    Pat.    Pat.
How Contacted    Radar    Carrier    Sight    Sight
Initial Range    7 Hiles   15 Hiles   20 Hiles   6 Hiles
Elevation angle    15°    20°    50°    50°
Range & Relative
Bearing of Plane    ND    ND    ND    ND
When it Detected
S/M

(State (Bossu-
   2    2    2    2
Sue: (fort)
(Direction (hol)  270°    270°    090°    000°
Visibility (iles)  20 miles   20 miles   5 miles   20 miles
Clouds: (Hight in Ft.1000 ft.  1000 ft.  1000 ft.  1000 ft.
   80%    60%    40%    70%
(Bearing (Rol)
Moon: (nglo    Day    Day    Day    Day
(Poront
Illum.

- 41 -

— page 49 —
U.S.S. C.V. LILL. Report of First War Patrol.

| CONTACT NUMBER | 13 | 14 | 15 | 16 |
||----|----|----|----|
| Date         | 6-23-44 | 6-29-44 | 7-1-44 | 7-1-44 |
| Time (Zone)  | 1221 (H) | 0905 (I) | 1001 (I) | 1239 (I) |
| Position:  | Lat. | 13-36 N | 14-53 N | 15-02 N | 15-04 N |
| Long.        | 130-08 E | 131-43 E | 140-37 E | 141-01 E |
| Speed       | 14 kts. | 16 kts. | 18 kts. | 18 kts. |
| Course      | 2650T | 0900T | 0840T | 0850T |
| Trim       | Surface | Surface | Surface | Surface |
| Minutes Since Last SD Radar Search | 0 | 0 | - | - |

| Number | 1 | 1 | 1 | 1 |
||----|----|----|----|
| Type  | Unk. | Unk. | Sally | Sally |
| Probable Mission | Unk. | Unk. | Patrol | Patrol |
| How Contacted | Radar | Radar | Sight | Sight |
| Initial Range | 1 hilo | 16 Milos | 12 Milos | 12 Milos |
| Elevation angle | 150 | 150 | 10 | 20 |
| Range & Relative Bearing of Plane when It Detected S/M | ND | ND | 850 | ND |
| | | | 10 Milos | |

| (State (Boat-Sea: | 2 | 2 | 2 | 2 |
| Fort) | | | | |
| (Direction (Rol) | 2000 | 0000 | 0000 | 0000 |
| Visibility (miles) | 5 miles | 20 miles | 30 miles | 30 miles |
| (Height in ft. | 1000 ft. | 1000 ft. | 1000 ft. | 1000 ft. |
| Clouds: (F.ront | 50% | 70% | 40% | 40% |
| Overcast | | | | |
| (Bearing (Rol) | Day | Day | Day | Day |
| noon: (angle | | | | |
| (Percent | | | | |
| Illum. | | | | |

— page 50 —
17 18 19 20
Date 7-2-44 7-3-44 7-3-44 7-19-44
Time (Zone) 0247(1) 0726(1) 1324(1) 1500(1)
Position: Lat. 15-14 N 14-53 N 14-44 N 15-03 N
Long. 144-15 E 142-02 E 140-30 E 121-46 E
Speed 16 kts. 16 kts. 16 kts. 2 kts.
Course 0920T 26k0T 26k0T 3000T
Trim Surface 12 hrs. - 12 hrs.
Minutes Since Last 12 hrs.
SD Radar Search

Number 1 1 1 1
Type Unk. PBM PBM HETTY
Probable Mission Unk. Patrol Patrol
How Contacted Hoard Sight Sight Sight
Initial Range 2 miles 12 miles 12 miles 3 miles
Elevation angle Unk. 20 10 30
Range & Relative ND ND ND ND
Bearing of Plane
when It Detected
o/4

(State (Boat- 2 2 2 3
Sea: (fort) (Direction(Rd) 0000 1800 1800 1800
Visibility(0.1los) 5 miles 20 miles 20 miles 5 miles
(Hight in.Ft. 1000 ft. 1000 ft. 1000 ft. 600 ft.
Clouds:(Percent 50% 40% 30% 80%
Overcast

(Bearing(Rd) No Day Day Day
Moon:(nglo 1oon
(Front
Illum.

— page 52 —
1118 (I) Date: 6-19-44 Lat. 11-50 N. Long. 137-57 E

TARGET D.T.T. - D.T.T. INFLICTED

DESCRIPTION:
Task force including one CV, SHOT.KO class, two C.I.'s AT.CO class and three DD's. The two cruisers were on port flank of carrier. Only one destroyer was sighted prior to attack, and it was keeping station about 1000 yards on starboard quarter of carrier.

SHIP D.T.T. OR PROB.BLY SUNK - One SHOKKU class CV 15,000 tons.

D.T.T. DET.RIND BY: First three torpedoes of six torpedo spread hit at proper time intervals. Heard four terrific explosions in direction of attack two and one half hours after torpedo hits.

TARGET D.T.T.: Draft 25 feet; course 1150T; speed 25 knots range 1200 yards.

ON SHIP D.T.T.

Speed 3 knots; course 0250T; depth 63 feet; angle 00-40 down.

FIRE CONTROL AND TORPEDO D.T.T.

TYPES D.T.T. OK: Periscope depth attack on high speed target. Three observations were made, total time of attack 16 minutes. .11 fire control instruments functioned properly. Cheek bearing was given before each of the first five torpedoes were fired.

— page 53 —
U.S.S. C.V. L.L. Report of First War Patrol.

| TORPEDO | T.W. OK NO. | 1 | 2 | 3 | 4 | 5 | 6 |
|||----|----|----|----|----|----|
| Tubes Fired | 107 S | 110 S | 120 S | 112 S | 134 S | 122 S |
| Track Angle | 017 | 020 | 030 | 022 | 044 | 032 |
| Gyro Angle | 15 | 15 | 15 | 15 | 15 | 15 |
| Depth Set | High | High | High | High | High | High |
| Power | Hit or Miss | Hit | Hit | Miss | Miss | Miss |
| Erratic | No | No | No | No | No | No |
| TK. Torpedo | 23 | 23 | 23 | 14-3... | 14-3... | 14-3... |
| Serial No. | 52955 | 41262 | 49368 | 25234 | 26212 | 24134 |
| MK. Exploder | 6-4 | 6-4 | 6-4 | 6-4 | 6-4 | 6-4 |
| Serial No. | 18073 | 1024 | 696 | 4062 | 8661 | 68 |
| Actuation Set | Contact | Contact | Contact | Contact | Contact | Contact |
| Actuation Actual | Contact | Contact | Contact | Contact | Contact | Contact |
| MK. Armed | 16-1 | 16-1 | 16-1 | 16-1 | 16-1 | 16-1 |
| Serial No. | 6250 | 11451 | 13665 | 2042 | 13832 | 13336 |
| Explosive | Torpex | Torpex | Torpex | Torpex | Torpex | Torpex |
| Firing Intervals | 8 sec. | 8 sec. | 8 sec. | - | - | - |
| Type Spread | Divergent | Divergent | - | - | - | - |
| Sea Conditions | Moderate | Moderate | - | - | - | - |
| Overhaul Activity | Pearl Harbor, T.H. | - | - | - | - | - |

Remarks: Started to go deep after fourth torpedo was fired. Stop bolt on tube 6 did not lift and was sheared off. Down angle on ship letting weight of torpedo rest on stop bolt and jamming it was attributed the cause.

— page 54 —
1530 (H) Date 7-18-44  Let. 16-02 N Long. 123-00 E.

TARGET D.T. - D.M.G. INFLICTED

SUNK: S.S.P.N, 50 tons, "Rising Sun" on each side of Filot House, Japenose lottors on bow. .about 10 Japanese soon on board.

DAMAGE DETERRED BY: Wretched Sampen sink after 16 hits with 4 inch high capacity sholle, and many hits with machino guns.

DET.ILS OF ACTION

| Type | Range | Type | Range |
|------||------||
| 4 inch dock gun | 500 yds. | High capacity | 19, 1 closer ing found. |
| 50 Cal. I.G. | 500-300 yds. | High explosive, tracer. | 420 rounds. |
| 30 Cal. I.G. | 500-300 yds. | High explosive, Ix-plosivo tracer ball | 600 rds. |
| 45 Cal. | 100 yds. | Ball. | 250 rds. |
|        |        | Ball. | 125 rds. |

Local Control was used and radar ranges.
The 4 inch was most offective making 16 hits out of 19 rounds fired, each exploding shell made about a 6 ft. hole in the target.
The machino guns wore offective mainly against exposed enemy personnel.
The 4 inch suffered a broken return spring on the remote foot firing pod.
Both 20 in's jammed due to shell casos striking in the barrel.

— page 55 —
U.S.S. C.VAILA  Report of First War Patrol.

(I)  MINES

Fone Observed.

(J)  AUTI-SUB-TRINE RESIDUALS AND EV-SION TACTICS

Both convoys contacted were escorted by radar equipped Destroyers. Echo ranging at intermittent intervals was heard from the second convoy, none from the first. It is believed that we might have been detected by radar by the first convoy, due to timely action of one escort which forced us to go deep to prevent ramming.

No indication of radar was picked up by the detector on the Task Force contacted at night. We were ahead of Task Force and on surface until range decreased to seven (7) miles, but no evidence was shown that we had been detected. We passed under this force, and at no time was echo ranging heard.

Echo ranging was not used by the Destroyers that depth charged us after we torpedoed the Carrier. They appeared to slow down for a few minutes after each attack, and increased speed before making new attacks. No temporary gradient was present, so our evasion tactics consisted of changing course to keep true bearing of attack. Destroyer drawing aft.

No planes, and no anti-submarine vessels were seen over San Bernardino Strait. However on several occasions the Hedar detector indicated the possibility of Radar on the beach in the vicinity of the Strait. On two occasions at night the SJ Radar picked up possible submerged submarines in this area.

(K)  JUNIOR DEFECTS AND DISLOCATIONS

1. HULL

(a) Soon after going to deep submergence following the attack on 19 June, a loud hissing noise was heard over the crows galley. Upon investigation, it was found that the hull ventilation supply outboard piping was flooded. Believe depth charges may have cooked the gasket on the outboard valve. This piping had never flooded before, and hasn't since.

(b) On the first conversion of #4 F.B.T. to a B.T., it was discovered that the main vent gaskets were rubber instead of neoprene, and were badly eaten away. The gaskets were replaced by spares.

— page 56 —
U.S.S. CAV/II. Report of First. ar Petrol.

(a) On 4 July the Hydraulo .cumulator commenced making a loud noise when charging. .after three days of trying to locate the trouble, the cause was finally found to be due to the following: The spring on top of the automatic by-pass had more spacers over it than the blueprint called for, thus causing excessive spring tension on top of this valve. .after the excess spacers were removed the plant functioned properly.

(a) On 23 June the hull ventilation supply inborda Flapper valve was noted to be very sticky and hard to operate. It was decided to make it a routine to operate this valve at least three times every watch to keep it froo. This practice was mentioned for the commander of the patrol. It is recommended that a hand hole plate be installed in the ventiltion line below the flapper valve, so as to make the valve easily accessible for inspection and lubrication.

(a) Three different occasions on surfacing we were unable to immediately open the upper conning tower hatch due to the dogging mechanism freezing momentarily. The reason for this was finally ascertained to be due to the fact that the graphite impregnated flax packing had become so dry that it gr.bood the shaft in the packing gland. We then made it a routine to squirt lub oil on this packing gland daily. It is believed that a groase fitting should be installed at this packing gland.

2. TORPEDOES AND GUNNERY

(a) .after the torpedo attack on 19 Juno it was discovered that the stop bolt on tube 16 had shorced. .when tube was fired the ship had botwoon a 3 and 4 dogroo down angle. The weight of the torpedo resting on the stop bolt probably caused a sluggish action. The brass pins in the stop bolt rod and the stop bolt shorced. The dam age was repaired by ship's forco.

(b) During the attack on the Sampan on 18 July the pawl spring on the 4 inch gun broke. The spring was replaced in about one half hour and firing resumed.

— page 57 —
U.S.S. C.V.III. Report of First War Patrol.

(c) Of the ton AK. 23' and six 14-3. torpedoes received on board, eight had to have to the exhaust valves rocketed. Looking of those torpedoes was discovered by Lt. Irby of lockmotor tests. Otherwise, torpedoes carried wore in excellent condition.

3. 1. OILING AND ELECTRIC. L.

(a) Upon starting 2 min engine on 6 June no L.O. pressur built up, and the engine was soared immediately. Examination revealed the stub shaft of the L.O. pump to have sheared. Before the spare pump was installed it was carefully examined, and bracing cleancros wore found to be too low, and the bracing was scraped and blued in until the correct cleancros, as given in the manufacturer's instruction book wore obtained. The pump was then mounted, employing a dial indicator to insure correct alignment.

(b) Upon surfacing on 14 June, the outboard exhaust valve on 14 min engine was opened too soon, with the following results: engine flooded, 9 cylinder liner cracked adjacent to one of the stud bolts, also the crown and portion of the skirt of the piston wore cracked. This piston bore in service for 1106 engine hours. ... now piston and liner wore installed.

(c) Upon starting 14 min engine on 15 June, fresh water was found seeping at 9 cylinder air box door. Examination showed that the liner installed the day before had developed a small break adjacent to one of the stud bolts, the crack running down the outside wall of the liner only, for a distance of about two inches. This break was apparently the result of a weakness of the liner wall in the vicinity of the stud boring. Tension on the stud bolts had been gauged at the time of installation by use of a torque wrench. ... now liner was installed.

(d) Upon surfacing on 23 June, 2 min engine was flooded, resulting in the cracking of 9 cylinder liner adjacent to a stud bolt. ... now liner was installed.

— page 58 —
U.S.S. C.W.I.L. Report of First War Patrol.

(e) The fresh water jumper between the exhaust header and the exhaust elbow of 416 cylinder of 14 main engine developed a leak at the weld where the jumper joined the header on 11 June. It was temporarily repaired by brazing. However, by 24 June, the amount of loss of fresh water through the break had increased, that further operation of the engine was impossible. All attempts to seal the leak by silver soldering, brazing and torch welding were unsuccessful. Finally, the jumper was cut off, and the opening in the exhaust header jacket was blanked off. This was accomplished by applying a neoprene rubber gasket backed by a galvanized iron metal sheet drilled, tapped and bolted down to the exhaust header jacket. The jumper was then cut off flush with the exhaust elbow flange, the opening tapped to take 1" piping, and the fresh water circuit completed by piping running to and tapped into the fresh water header. This job took two days.

(f) An exhaust valve stem in 18 cylinder of the auxiliary engine carried away, allowing the valve head to drop down into the cylinder. The engine was secured immediately, but the following damage had already been sustained: The cylinder liner was scored slightly, the piston crown dented, the cylinder head dented, injector tip smashed, and the remaining three exhaust valve stems bent. All damaged parts were replaced, the cylinder given a complete overhaul, and the engine placed back in commission. The time of the casualty to the engine had been in service for 831 hours.

(g) The bridge gyro repeater flooded out on 15 June due to puncture in pressure proof cable. The repeater parts were removed, disassembled, cleaned and stowed. The pressure proof cable was wrapped at the cross of the puncture and the circuit cut off from the conning tower junction box.

(L) The following results were obtained:

(a) 4525 KCS - reception very poor and generally unreadable.
(b) 6380 KCS - reception good from 0600Z to 2000Z, but from 2000Z much fading.

— page 60 —
1. RADAR
S-7 Radar - All troubles were more or less of minor nature. The operation was satisfactory. However, Destroyers could not be picked up over 15,000 yards, and it is hoped that this range can be increased during the forthcoming upkeep.

SD Radar - Operation was satisfactory with the exception that low flying planes could not be picked up until they were within 4 or 5 miles. There were two major derangements, listed below:

(a) CRT High Voltage transformer developed an internal short, but was unable to open it and locate trouble because it was mounted in pitch. No spare transformer on board or in allowance list. This derangement occurred on 21 June. Made temporary hook-up of the oscilloscope in the Cathode Ray Circuit and used the sweep lead from the vertical plate of the SD scope to actuate the scope of the oscilloscope. The oscilloscope was then synchronized with the transmitter impulse of the SD at 60 cycles per second. One vertical plate and one horizontal plate were internally connected and rounded in the oscilloscope and was thus unable to use both vertical sweep circuits of the SD scope or to use the horizontal sweep at all. This gave a full 1/60 second sweep on the oscilloscope. The opportunity was not had to check this hook-up close to shore, so its operation was uncertain. A spare transformer was obtained and installed at Saipan.

(b) Three strands of the SD mast hoist cable parted at approximately the same location. The cable was replaced, using a spare periscope hoist cable.

MADAR DETECTOR - Ficks up interference from own ship. All radars detected, except own SD, have given quite weak signals.

— page 61 —
U.S.S. CAVALIA  Report of First War Patrol.

(N)  SOUND GEAR AND SOUND CONDITIONS

Sound conditions were very good throughout the patrol, and the usual amount of trouble was encountered with water and fish noises. The JP gave excellent service. The Carrier Task Force which was attacked was picked up at about 15 miles, before it could be sighted through the periscope. The following derangements were suffered:

(a) Following attack on 19 June, and during the depth charging which followed, both the QB and JK-0 sound training motors grounded out, burning out the two field coils in the JK-QC motor and one field coil in the QB motor. Both motors wore pulled from the pit and disassembled, but all attempts to put them back in commission wore unsuccessful. The late motor, a 2 H.P. motor, was hooked up in place of the QB motor, a 1 H.P. motor. The series field of the late motor was disconnected and the QB mounting was adapted to the late motor. In addition to changing the mounting, it was necessary to cut a link from the motor shaft and the gear train short. This will not prevent re-adaptation of the late motor to the late. This hook-up worked very well for remicinder of patrol. No spares were obtainable in Saipan. Trimming of JK-QC was from the forward torpedo room by hand for remainder of patrol.

(b) The QB sound head vibrates badly when used on the surface at a speed of seven knots or above. This vibration can be felt throughout ship, even on the bridge. All attempts to remedy it have been unsuccessful. This vibration does not exist at any speed submerged.

— page 62 —
U.S.S. CAVALIA  Report of First War Patrol.

(0)  DENSITY LAYERS

The following density layers were noted:

| DATE  | TIME       | POSITION | REMARKS                                                                 |
|-------||||
| 9 June 1944 | 0800 (L) | 24-32 N  | Thirteen degree negative gradient to 300 feet.                      |
| 17 June 1944 | 2000 (I) | 12-22 N  | Isothermcl to 140 feet and c two degree negative gradient from 140 to 300 feet. |
| 1 July 1944 | 1000 (I) | 15-02 N  | Two degree negative gradient to 280 feet.                              |
| 13 July 1944 | 0500 (H) | 13-05 N  | Isothermcl to 120 feet, and c sovon dogreo negative gradient from 120 to 300 feet. |
| 16 July 1944 | 0500 (H) | 13-28 N  | Isothermcl to 140 feet and c sovon dogreo negative gradient from 140 to 300 feet. |

(P)  HEALTH, FOOD, AND HABITABILITY

Food and healthability was excellent. Except for injuries, health was very good. It is believed unusual that not one man was treated for a cold. Three men wore cdamitted to the sick list for injuries, one for a lccorrected right foot and left thigh, and two for lccorrected right leg and foot. Our phrenic list's m.r.t.u., R.L. Chandler, Phila., U.S. Navy, is highly commended for doing an outstanding job of maintaining the health and morale of the crew at such a high state. He is considered qualified in all r.s.posts for advancement to the next higher rate.

— page 63 —
U.S.S. CAVALIA  Report of First War Patrol.

(Q) PERSONNEL

The performance of duty of the officers and enlisted men was excellent. When possible, school of the boat was conducted daily for unqualified men. At the start of the patrol all unqualified officers were assigned certain topics on which to lecture. This proved beneficial not only to the enlisted men, but also to the officers themselves. Of the 73 men on board, 39 were qualified at the start of the patrol. During the patrol 14 more were qualified, and 12 were advanced in rating.

(R) MILES STEAMED - FUEL USED

| Miles Steamed | Fuel Used |
|||
| 1340          | 19,112    |
| 3290          | 40,733    |
| 9055          | 95,371    |
| 3100          | 41,256    |

(S) DURATION

Days enroute to area (From Pearl Harbor) 15
Days in area 40
Days enroute to base (Majuro) 9
Days submerged 19

(T) FACTOR 15 OF ENDURANCE RE-AIMING

| Torpedoes | Fuel | Provisions | Personnel |
||------|||
| 18        | 8000 | 15 Days   | 10 Dcys   |

Limiting factor this patrol - Orders.

(U) PERSONNEL

There were four major cont.ots made on this patrol, two of which were making 15 knots, one making 19 knots, and one making 25 knots. All four had radar. This competition proved a little tough for a beginner, two of the contacts getting by, but it is bollivod that the experience gained will bear fruit in future patrols.

— page 64 —
1. FSB-142/AL6-3
Serial: 042
Date: 1/1/44
FRSH ADDRESS: CO US CAVALLAS First War Patrol.
The Commander Submarine Division 142.
The Commander Submarine Force, Pacific Fleet.
The Commander Submarine Squadron FOURTEEN.

Subject: U.S.S. CAVALLAS (33244) - Report of First War Patrol, Comments on.

1. Forwarded.

2. The first patrol of the CAVALLAS was of 64 days duration of which 40 days were spent in the assigned area east of the Philippines. The patrol was interrupted in 6 days while enroute to and from Saipan to obtain more fuel. CAVALLAS had the distinct honor of being the first U.S. submarine to enter this port.

3. There were four major contacts made on this patrol, two of which were making 15 knots, one making 19 knots and one making 25 knots. All four had r/car. For a new commander officer and a new ship, this was real competition.

4. The first contact was a convoy of two large tankers and two escorts. Before attack position could be obtained, CAVALLAS was driven deep narrowly escaping collision with a destroyer which subsequently passed directly overhead.

The second contact was a large Japanese task force, speed 19 knots, consisting of at least seven large ships and an undetermined number of smaller craft. Since CAVALLAS did no knowledge of a previous contact on this important task force, the Commander Officer decided to abandon the attack, surfaced as soon as possible and sent in a contact report. This timely information proved to be of immeasurable value to our attacking forces at Saipan.

The third contact and first attack by the CAVALLAS was made on a 15,000-ton US cargo carrier, in company with two cruisers and three destroyers. This attack was beautifully executed. The first was making 25 knots and was in the act of landing aircraft. On the second, the destroyers were made into total time of attack was 18 minutes. Six bow torpedoes were fired with track angles between 107° to 124° S. 125° divergent spread was used and torpedoes were fired at the last time missed. CAVALLAS evaded at deep submergence, and 106 depth charges were dropped over a period of 3 hours.

— page 66 —
1. The Commander Submarine Squadron FOURTH.
To: The Commander in Chief, U. S. Fleet.
Via: (1) The Commander Submarine Force, Pacific Fleet.
       (2) The Commander in Chief, U. S. Pacific Fleet.

Subject: U.S.S. CAVALLA (SS244) - Report of First War Patrol - Comments on.

1. Forwarded.

2. Many submarines have made ten or more war patrols and never seem to have any task force. On this, her first patrol, CAVALLA fell in with two major tasks forces and a group of tankers probably heading for a fueling rendezvous with those same or other enemy forces. The high spots of the patrol were the making and reporting contact with the large task force on the night of 17 June and the attack on a SHOKU class carrier on 19 June.

3. The carrier attacked at 1118 on 19 June was a part of a task group which contained one carrier, two cruisers and at least three destroyers. Three hours earlier at a point bearing 300° true and distant 60 miles, ALBACORE had sighted two separate carrier groups about four miles apart, each with one cruiser and several destroyers. Their base course was approximately toward CAVALLA's position. ALBACORE got one hit on one carrier, CAVALLA saw but one carrier group and this contained only one carrier but had two cruisers. This suggests the possibility that the cruiser formerly escorting ALBACORE's carrier was no longer required for that purpose. The ALBACORE carrier was still aboard. It appears the attack on our fleet. CAVALLA was still aboard. It appears probable that they never did get off. Therefore, CAVALLA's attack was particularly important in its influence on the events of 19 June.

4. The experience gained on her first patrol should prove very valuable to CAVALLA and pay dividends later.

5. The Commanding Officer, officers and crew are congratulated on the severe blow they inflicted upon the enemy at an especially critical time.

C. T. BONNLY.

Copy to:
CSD 142
CO, CAVALLA

— page 67 —
14 AUG 1944
FF12-10/A16-3(15)/(16)
Serial 01678
DEALAGIFT
THIRD ENDORSEMENT to
CAVALIA Report of
First War Patrol.
COMSUBSPAC PATROL REPORT NO. 496.
U.S.S. CAVALIA - FIRST 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. CAVALIA (SS244) - Report of First War Patrol (31 May to 3 August 1944).

1. The first war patrol of the CAVALIA was the first for the new Commanding Officer, as such. The periscope contact reports were broadcast with great accuracy. The decision for the CAVALIA to withdraw from the Eastern Philippines was made on 17 June in order to get off an important contact report. An attack would have meant a delay in getting off this report because of enemy countermeasures. The contact report on the tanker convoy sent on 16 June was also of great importance.

2. Excellent area coverage was made by the CAVALIA. The attack on the SHOKKU class carrier was extremely well conducted and aggressive. Three hits in this large carrier with heavy explosions in the direction of the attack two and a half hours later is considered sufficient evidence to credit the CAVALIA with the sinking of this carrier.

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

4. The Commander Submarine Force, Pacific Fleet, congratulates the Commanding Officer, officers, and crew for this exceptionally conducted patrol. The CAVALIA is credited with having inflicted the following damage upon the enemy:

— page 68 —
1- Carrier (SHOKAKU class) (EC)
   - Attach No. 1.
   - S-UN-1-K
   - 1 - Sanpan
     (Gun Attach No. 1).

DISTRIBUTION:
(Complete Reports)
   - Cominch
   - CNO
   - Cinopac
   - Intel.Cen.Pac.Ocean Areas
   - ComServPac
   - Cinclant
   - Comsubsblant
   - S/M School, NL
   - ComSoPac
   - ComSoIesPac
   - ComSubsoIesPac
   - CTF 72
   - ComHorPac
   - ComSubsPac
   - SUBAD, HI
   - ComSubsPacSubOrdCom
   - All Squadron and Division Commanders, Pacific
   - SubTrainPac
   - All Submarines, Pacific

E. L. HYNES, 2nd, Flag Secretary.

— page 69 —
12 07:39
From: 21 October 1944
To: 12 07:39
Via: 21 October 1944
Subject: U.S.S. CAVILLAS (SS244) - Report of Her Patrol Number Two.
Enclosure: (1) Subject Report.
(2) Track Chart (To ComSubPac only).

1. [NOLOUSE (1), covering the second war patrol of this vessel conducted in the Philippine area during the period 30 August 1944 to 21 October 1944, is forwarded herewith.]

H.J. KOSSLER.
DECLASSIFIED ART. 0445, OPNAVINST 5810.10C
BY OCP-082C DATE 5/24/72

— page 70 —
1944

Subject: U.S.S. CAVILLA - Report of Second War Patrol.

(A) PROLOGUE

Arrived Majuro from First War Patrol on 3 August 1944 for normal refit by U.S.S. BUSHULL and Submarine Division 1,2 Relief Crew. Drydocked in 1st 16 ft 17 August for routine bottom work and painting. The following major work items were accomplished during the refit:

(1) Four main engines and auxiliary engine completely overhauled.

(2) New mufflers installed for #3 and #4 main engines.

(3) Second 4"/50 caliber ready service locket--tailed topside.

(4) Forward tube nest firing and ready light circuit cable between the conning tower and control room was replaced because of a rupture and subsequent flooding out.

(5) Pet cock installed in grease lines to hull induction supply valve.

(6) Voice tube between bridge and conning tower was removed and the hole welded.

(7) VHF installed.

(8) Both sound head training motor replaced, and a cofferdam was built to protect them from bilge water.

(9) S&R radar modified to allow keying.

Underway for training exercises 23 to 27 August. Redcar and 2nd approaches were made, and one Mk 18 and two Mk 23 exercise torpedoes were fired. All guns were fired at a towed target. Facilities were not available for sound testing or deperning. Load-ing accomplished 28-29 August. Deep dive was made on 29 August to test newly installed torpedo firing and ready light circuit cable.

Lieutenant (jg) E.C. PAGE E-V(PS), USNR, reported aboard for duty. Readiness for sea 30 August 1944.

— page 71 —
20 August 1944

0515 (L) Underway from alongside U.S.S. BUSHNELL. Joined up with the PIRNEL and our escort, the U.S.S. CROUTER (DE 11), and proceeded in company from Lajuro.

0945 (L) Escort departed at entrance to safety lane. Changed course to pass through safety lane, in company with PIRNEL.

1543 (L) Ship contact #1. Sighted most of ship believed to be U.S. Destroyer patrolling in vicinity of Wotje. Passed Wotje aboard to port distant 15 miles.

1604 (L) Plane contact #1. Sighted two planes, SED type, heading from Lajuro towards Wotje. Exchanged recognition signals.

1934 (L) On orders from PIRNEL, opened out to 15 miles on port beam.

27 August 1944

Proceeding in company with PIRNEL, enroute to rendezvous with RAZORLOCK.

1 September 1944

1324 (L) Ship contact #2. Made rendezvous with RAZORLOCK.

1359 (L) Proceeded in company with RAZORLOCK and PIRNEL. RAZORLOCK guide, PIRNEL five miles on starboard beam, C.V.ALL. five miles on port beam.

2 September 1944

0500 (L) Passed Woke Island abeam to port, distant 20 miles.

0618 (L) Encountered radar interference on 133 megacycles, which continued throughout morning.

— page 72 —
0954 (L) Made rendezvous with RIZORBACK and received mail.
: 1025 (L) Submerged. Conducted trim dive.
: 1043 (L) Surfaced. Bridge gyro compass repeater flooded out.
: 2102 (L) Stationed radar tracking party and commenced end around on RIZORBACK.
: 2205 (L) Completed end around and scoured from battle stations.

3 September 1944
: 0937 (L) Submerged. Conducted trim dive and exerci sed crew at emergency drills.
: 1029 (L) Surfaced.
: 2120 (L) Stationed radar tracking party and commenced end around on RIZORBACK.
: 2313 (L) completed end around and scoured from battle stations.

4 September 1944
: 0620 (L) Submerged. Conducted trim dive and exerci sed crew at emergency drills.
: 0723 (L) Surfaced.
: 0800 (L) Set clocks back one hour to zone (-10) time.
: 0930 (K) Stationed radar tracking party and commenced end around on RIZORBACK.
: 1037 (K) Submerged to radar depth and completed practice attack.
: 1050 (K) Surfaced. Secured from battle stations.
: 1125 (K) Entered safety lane.

5 September 1944
: 0645 (K) Sighted aircraft expendable gas tank, lat. 18-10N, long., 153-12E.

— page 73 —
6 September 1944

0729 (K) Submerged to conduct radio test and trim dive.

0620 (K) Ship contact #3: Sighted submarine on easterly course, which passed us about two miles abreast. Identified as friendly. Fired two recognition smoke bombs, but submarine gave no indication of having noticed our presence. On reaching Sipan found out this was the Greenling.

0932 (K) Surfaced.

1110 (K) Ship contact #4. Sighted and exchanged cells with BILLFISH.

1433 (K) Plane contact #2. Sighted at 12 miles and identified as Marauder type bomber.

1619 (K) Plane contact #3. Sighted at 12 miles and identified as PEM.

1676 (K) Plane contact #4. Sighted at 12 miles and identified as PEM.

1706 (K) Sighted instantan Island bearing 2500T, and Sericen Island bearing 2820T, distant 60 miles.

1713 (K) Plane contact #5. Sighted three unidentified bombers, distant 15 miles.

1752 (K) Plane contact #6. Sighted at 16 miles and identified as PEM.

1900 (K) Reversed course for 14 hours to delay time of passage through Inatahan and Serican Islands.

7 September 1944

0005 (K) Completed passage through Islands, and formed column eastern RIZORBLOCK.

— page 74 —
0314 (K)
: 0434 (K)
: 0708 (K)
: 1008 (K)
: 1025 (K)
: 1112 (K)

8 September 1944
1600 (I)

1645 (I)

All repairs completed by the tender, made following was accomplished during our stay:
(1) Received 32,000 gallons fuel oil.
(2) Received 420 gallons lubricating oil.
(3) Received 6000 gallons fresh water.
(4) Received a few provisions.
(5) New electrical cable installed to bridge
(6) Leyd in 1/2 main motor circulating water
(7) Pump repaired.
(8) Tested and made adjustments to VHF.
(9) Attended "Wool Park" conference.

Underway from alongside U.S.S. HOLLAND, Lieutenant J.L. HEATING, USNR, on board as pilot.

— page 75 —
1717 (I) Cleared Tenpage Channel. Fillet left the ship. Formed column in following order, U.S.S. BUOYANT (Escort), RAZORBACK, FIRANHA, CAVALIA.

2335 (I) Escort departed. Proceeded in company with RAZORBACK and FIRANHA, with RAZORBACK guide, FIRANHA 5 miles on st. board beam and CAVALIA 5 miles on port beam.

9 September 1944

0501 (I) Submerged for trim dive.

0549 (I) Surfaced.

0630 (I) Plane contact #6. Sighted at 12 miles and identified as FBM.

0227 (I) Plane contact #7. Sighted at 9 miles and identified as Liberator type.

1320 (I) Tested radio reception with RAZORBACK which was submerged.

1350 (I) Commenced radar tracking drill with RAZORBACK as target.

1541 (I) RAZORBACK, which was 5000 yards distant, was seen to light a flare and dive

— page 76 —
2223 (I) SJ radar back in combat action. This was a creditable job by the Radar Officer and Radar Technicians who jury rigged a substitute for a damaged coil, spares for which are not on the allowance. (See Radar Section)

10 September 1944

0731 (I) Plane contact #8. Sighted and picked up by "SD" at 18 miles. Challenged with IFF and reply received. The plane crossed our stern from starboard to port, and commenced moving up our port side, flying in the cloud coverage and staying at range about 15 miles. When approximately broad on quarter, plane headed in directly for us. When range closed to 10 miles fired recognition flares and at

0744 (I) Submerged. Plane believed to be a "Mavis".

0828 (I) Surfaced.

1004 (I) Sighted expendable aircraft gasoline tank, and many floating objects such as crates, oil drums, net buoy, in vicinity of lat. 14-59 N, long., 138-05 E.

1250 (I) Received radio message PINNEA was diving for enemy plane.

1330 (I) Plane contact #9. Sighted plane dead ahead, distant 18 miles, heading directly for us. When plane closed to about 12 miles, fired recognition flare, and attempted to challenge by searchlight. However, plane continued to head in, and at

1334 (I) Submerged. Range to plane about 10 miles. Believed to be a "Mavis".

1443 (I) Surfaced.

— page 77 —
11 September 1944

1058 (I) Plane contact #10. Sighted about 150' forward of starboard beam distant 15 miles, on parallel and opposite course. When the plane reached our starboard quarter it suddenly changed course and headed in for us. Sighted flare, and at

1106 (I) Submerged. Flare believed to have been a "Betty".

1239 (I) Surfaced.

1816 (I) Sighted expendable gas tank, lat. 11-59N, long. 132-07E.

12 September 1944

0605 (I) Submerged for daylight submerged patrol in "Waiting 'ree", in accordance with instructions received from Wolf Pack Commander. Exposed the SD antenna every hour on the half hour for five minutes during the day. NPS was picked up (See Radio Section L)

1526 (I) Surfaced. Set course for assigned station on patrol line.

2225 (I) On receipt of Commander Submarines Pacifico's message onnanging position of patrol line, increased speed to 17 knots. We would have reached the old station on time but will be several hours late getting to the new station.

13 September 1944

0610 (I) Plane contact #11. Sighted three carrier type aircraft in formation on starboard beam, distant 12 miles. Decided to dive to avoid detection, so at

0612 (I) Submerged.

0716 (I) Surfaced.

— page 78 —
0725 (I) Plane contact #12. Sighted formation of 8 to 10 planes just forward of port beam, distant 15 miles. When they drew abreast, two or three of the planes peeled off and headed in our direction.

0727 (I) Submerged.

0832 (I) Surfaced and sent contact report, our serial #1.

1300 (I) Entered assigned station, and commenced patrol in accordance with instructions. During the day intercepted several aircraft contact reports on ships in vicinity of Bonins.

2010 (I) Sighted what appeared to be two very distant yellow fires bearing 2600T and 2100T from our position lat. 14-55N, long. 128-15E.

14 September 1944

0745 (I) Intercepted message from unidentified U.S. Submarine that she was diving for enemy plane.

0755 (I) Intercepted message from PIRANHA that she was diving for enemy plane.

0843 (I) Plane contact #13. Sighted unidentified plane distant 12 miles heading in our direction. The plane disappeared in a cloud immediately after it was sighted.

0844 (I) Submerged.

0959 (I) Surfaced.

1141 (I) Plane contact #14. Sighted unidentified plane distant 15 miles heading in our direction. The plane disappeared in a cloud shortly after sighting.

— page 79 —
1142 (I)
- 1142 (I)
- 1229 (T)
- 1608 (I)

Submerged. Completely overcast sky, with low heavy clouds, is keeping everyone on their toes wetting for planes. Am keying the "SD" radar every minute, but am getting "no results" from it. ...Iso have the radar doctor named, with little results so far.

Surfaced.

Flare contact /15. Sighted plane distant 15 miles, not heading in our direction. This plane also disappeared in clouds. Iemained on surface and kept careful look-out, but it did not reappear.

During the day many large flocks of geese were sighted, and it was very difficult at times, especially when they were flying through clouds, to distinguish them from plane formations. If the sky doesn't soon clear everyone will have a case of the jitters. It has been almost completely overcast for the last three days.

15 September 1944

Completely overcast today, for fourth day in row. ...e are navigating almost entirely by sun lines.

16 September 1944

Except for a couple of hours during the afternoon, the sky was completely overcast again today for fifth day in a row.

17 September 1944

Sky completely overcast today, for sixth day in a row.

2000 (I)

Contact on 57 radar bearing 2520T, distant 5150 yards. ...ent to two engine speed, and changed course to put contact astern.

— page 80 —
2006 (I)
- Contact lost, bearing 2150ft, distant 6500 yards. Changed course and headed back towards bearing of cont.ct, but it was never regained. Nothing was sighted from bridge. Believe this was a "boogie", even though radar operator claimed he had a good strong "pip". There was no radar interference, or anything plotted up by the detector.

18 September 1944
- Sky completely overcast today, for seventh day in a row.
- In accordance with despatch instructions, changed course and speed to head for new patrol station.
- Submerged. We hadn't made a trim dive in four days, so took advantage of the time I had to waste to lose distance on patrol line. Also made deep dive.
- Surfaced.
- Commenced equalizing charge.
- Completed equalizing charge.

19 September 1944
- Sky finally cleared today.
- Intercepted message that PIRATE was diving for plane.
- Intercepted message that PIRATE was again diving for plane. ...a slight nothing either time so remained on surface.

20 September 1944
- Let. 21-36N, long. 127-48E. Radio intercepts a plane to ship message, which sounded not too far from us. The text of the plain language message had to do with a "striking force" taking off. This was the first of several plain language messages intercepted between planes and their "Base" on 2102 KOS.

— page 81 —
0705 (I) to 0628 (I)
: 1343 (I)
: 1826 (I)
: 21 September 1944
: 0500 (I)
: 1445 (I)
: 22 September 1944
: 1735 (I)
: 1827 (I)
: 23 September 1944
: 0636 (I)
: 1456 (I)
: 0652 (I)
: 1436 (I)

---

**Subj: U.S.S. CAV IIIA report of Second Patrol.**

**Subj: Report of Second Patrol.**

**Subj

— page 82 —
1506 (I)
cleared immediately, and although machine gun bullets were hitting the water all around us, only one hit has been found on the ship, and that one dock just abaft the conning tower fairwater. This hit just missed the engine inquisition. Submerged immediately, but due to heavy seas, it took us over a minute to get completely under.

As I cleared the bridge, I was sure glad I had gone to church before leaving a-juro. This was a beautiful set up for "eight-d sub, sank seawo". The plane no doubt passed over us long before it got under. The only explanation I have for no bombs or depth charges being dropped, and the searoity of machine gun hits, is the following: at the time of sighting the aircraft we were swinging rapidly "to the right" following the Arme Course. Clock.

Foriscope depth. Nothing in sight. A rythmic loud clicking noise was heard on both JP and CB sound. Gear, and although it was deccarnined that this noise was caused by the ship, its source could not be determined. Officers were sent through the ship to stop and start machinery, also to listen with a stethoscope, but with no luck.

Surfecood.

#1 engine out of commission. (See Major deRocts and Damage).

Vory weak interforance encounterd on "ST", which persisted for about 10 minutes. Nothing sightd nor coateated by radar.

Plane contact #16. The J.O.O.D. and after lookout reported sighting yellow flare estern, elevation 30, distant about 3 miles. Not sighted by O.O.D.

Submerged.

Surfecood.

- 13 -

— page 83 —
2243 (I) to 2320 (I)
Radar interference encountered on "SD".
At times this interference was very strong.
However, nothing was sighted nor contacted
by radar.

24 September 1944

0720 (I) Intercepted message that PITANIA was diving
for plane.

0841 (I) Interference encountered on "SD".

0857 (I) Interference on SD getting much stronger,
plus indication of Jap radar on radar
detector. (See under Radar). Submerged.

1030 (I) Surfaced.

1438 (I) "I engine back in commission.

1530 (I) Intercepted message that PITANIA was diving
for plane.

2045 (I) Received message from Commander Submarines
Pacific changing our area.

2356 (I) Intercepted message that PITANIA was diving
for plane.

25 September 1944

0619 (I) Plane contact #17. "CD" contact distant
22 miles. The "CD" at the time was being
keyed every minute. "This contact lasted
only about one minute, however at

0623 (I) Sighted plane distant about 19 miles,
elevation 3°, apparently headed in our
direction.

0624 (I) Submerged.

0757 (I) Surfaced.

0839 (I) Intercepted messages from both PITANIA and
RIZOBLOCK that they had dived for plane.

— page 84 —
0900 (I) Changed course, in accordance with previous instructions, to head for newly assigned patrol area.

: 0919 (I) Plane contact 18 miles.

: 0920 (I) Submerged.

: 1116 (I) Surfaced.

: 1748 (I) Intercepted message that "SHOULD" was diving for plane.

: 26 September 1944

: 0400 (I) Entered new patrol area.

: 0729 (I) Lat. 22-46N, long. 124-44E. Sighted fishing net marker buoy fitted with part of a red flag on a stick.

: 0746 (I) Intercepted message that "FIFTY" was diving for plane.

: 0639 (I) Plane contact 19 miles.

: 0640 (I) Submerged. Decided to remain down for remainder of day in order to close coast undetected. Seas glassy. Exposed radar antenna 30-35 minutes after every hour.

: 1856 (I) Surfaced.

: 1926 (I) "SJ" radar made many contacts, anywhere from 900 to 1500 yards. There was a bright moon, glassy sea, and visibility was excellent. Nothing was sighted from bridge. More "bogies", and more gray hairs.

: 27 September 1944

: 0614 (I) Flane contact 20. Sighted at about 15 miles, elevation 10, and it appeared to be heading in our general direction. "SD" radar was not being used at this time.

— page 85 —
0615 (I)
- Submerged. Made periscope patrol during reincarceration of day, exposing radar antenna as instructed. Classy sea again today.

: 0650 (I)
- Sighted Kasho To Island 2640T, distant 40 miles.

: 0731 (I)
- Sighted Koto Sho Island 2200T, distant 48 miles.

: 0923 (I)
- Sighted mountains on Formosa through clouds.

: 1131 (I)
- Ship contact #6. Sighted Saman bearing 2770T, distant about 5 miles, which in a very short time, disappeared from sight.

: 1920 (I)
- Surfaced. Classy sea and very bright moon. Lead picked up by radar, distant 35 miles.

28 September 1944

: 0418 (I)
- The "SJ" radar made a possible contact on a plane, which quickly changed in bearing, and increased in range from 14 to 16 miles before disappearing from screen.

: 0445 (I)
- Received despatch from RIZORBORC giving area assignment. PILOT A asked RIZORBORC for a report of part of the message, but received no reply. We attempted to raise RIZORBORC to tell her PILOT, was calling, but received no reply, so went ahead and gave PILOT the part of the message she wanted repeated. (See uncler Radio)

: 0605 (I)
- Submerged. Made periscope patrol during reincarceration of day, exposing radar antenna as instructed. Classy sea again today.

: 1434 (I)
- Ship contact #7. While making radio antenna exposure at 54 feet, sighted what appeared to be two samps, bearing 2000T, distant about 12 miles. They disappeared in about ten minutes.

: 1927 (I)
- Surfaced. Moon very bright.

— page 86 —
2130 (I) About a 30 port list developed. Invest- Action showed that the 1st p.m. line to #6B M.B.T. had busted through at a point near the tank top, thereby closing this side to vent. Sent a repair party on deck to cover this hole if possible.

2400 (I) Completed installing a "soft patch" of sheet metal over the hole in the blow line, an excellent job by the First Lieutenant and auxiliary gang, working under adverse conditions. While they were working, there was a man standing by on the air- arette deck with a whistle, in case a plane should be picked up. Due to an- exhaust noise, shouting could not be heard.

29 September 1944

0610 (I) Submerged. Made periscope patrol during remainder of day, exposing radar antenna es instructed. Glassy seas again today.

1034 (I) Sighted an object distant about 3 miles, which was variously identified as follows: by the Commander, Officer, Executive Officer, and Officer of the Deck: (a) Small boat with five occupants. (b) Canoe or raft with three occupants. (c) Occupants probably survivors of sunken ship, or aviators. (d) Occupants paddling furiously on a north westerly course. (e) A very sunburned man, wearing long white pants, standing up aft and steering with a steering oar.

1051 (I) The excitement turned to embarrassment when the object was identified as a large troo stump, with three seagulls perched on it.

1922 (I) Surfaced. Very bright moon. Secured the "SD", commenced keying the "6J". No have a routine watch on the radar detector at all times on the surface.

— page 87 —
30 September 1944

0530 (I) Intercepted message that H.I. was diving for plane.

0614 (I) Submerged. Made periscope patrol during re-arrangement of day, exposing radar antenna as instructed, photo show island in sight distant 45 miles.

1845 (I) Went to deep submergence, no leaks, 70 negative credit.

1917 (I) Surfaced. Set course for new patrol station. The moon is so bright you can read a peep on topside.

1 October 1944

0818 (I) Intercepted message that H.I. was diving for plane.

0911 (I) Plane contact #21. Kicked up by "SD", range 8 miles, closing.

0912 (I) Submerged.

1226 (I) Surfaced.

1400 (I) Entered new patrol area.

1717 (I) Intercepted message that H.I. was diving for plane.

1800 (I) Plane contact #22. Sighted broad on port bow, observation 2°, distant about 7 miles, on converging course.

1801 (I) Surfaced.

1913 (I) Surfaced. Full moon.

— page 88 —
2 October 1944
0500 (I) Submerged. Radio periscope patrol during roueindcr of day, exposing radar returns as instructed.

1908 (I) Surfaced. No contacts during day.

2032 (I) Intercepted message that Taff was diving for plane.

3 October 1944
0509 (I) Intercepted message on Taff was diving for plane.

0606 (I) Intercepted message that Taff was diving for plane.

0609 (I) Submerged. Radio periscope patrol during roueindcr of day.

1911 (I) Surfaced. No contacts during day.

2040 (I) Received message from Wolf Pack Commander to patrol to westward of Luzon Strait tomorrow night, make submersed patrol to westward to westward to night, make submersed patrol to westward to

— page 89 —
0521 (I) Submerged. Conducted periscope patrol in Bell-Intercept Channel. A northerly current of about 2 knots was encountered during the day.

1916 (I) Surfaced. To contacts during day.

5 October 1944

0014 (I) Intercepted message that FIRE was diving for plane.

0020 (I) Radar detector picked up an intermittent sweep-in signal on 150 megacycles. The "SD" was not in operation, as has been the practice at night.

0025 (I) Flare contact 123. The signal sounded and became stronger, indicating we had been contacted, Submerged for remainder of day. The moon is full, making it almost as bright as day on topside.

0129 (I) Surfaced.

0220 (I) Radar detector picked up sweeping signal on 150 megacycles.

1927 (I) Surf. Coast. East course to head back to eastern part of area, as directed by old Fleet Commander.

2025 (I) Received notification that we were going to Australia for patrol and duty. Requested permission from old Fleet Commander to patrol western part of area during re-ender of time in area. Received coast. tech about 2200 (renting permission.

6 October 1944

0546 (I) Submerged. Hado periscope patrol during re-ender of day.

0822 (I) Hado about 16 very distant depth charge explosions. Nothing sighted through periscope.

— page 90 —
1155 (I) Heard about 12 very distant depth charges explosions. Nothing sights through periscope.

: 1421 (I) Heard distant rumbling noise. No doubt some ship just got it.

: 1434 (I) Four more distant rumbling noises were heard. Believe this was about the same time WALIS attacked her tanker. Our position at this time was about 100 miles from the attack.

: 1921 (I) Surfaced.

: 2048 (I) Picked up SJ interference to the North on us, believe to be RACORBACK heading East.

: 2059 (I) Received instructions from Commander Submarines Pacific on time and place for departure area and reporting for duty to OTP 71.

: 2119 (I) Picked up SJ interference to the South of us, believed to be FIRMITA heading East.

7 October 1944

: 0035 (I) Intercepted message that CHAFFORD was diving for plane.

: 0600 (I) Submerged, lade a riscope patrol during remainder of day.

: 1600 (I) Set clocks back one hour to zone (-)6 time.

: 1632 (E) Surfaced.

: 2143 (E) Reported our departure from area, and crew results of patrol to roll Pick Commander in RACORBACK.

8 October 1944

: 0730 (E) Passed through point we were told to pass through at 0800.

: 1834 (E) Received welcome message from OTP 71.

— page 91 —
9 October 1944

0534 (E) Ship contact #8. Sighted smoke of a large convoy bearing 1130m, distant about 10 miles. Changed course to open out and gain position ahead of convoy. The angle on the bow at this time was about 700 S.

0620 (E) Decided to send contact report. Sunrise was about 1/2 hour ago, and I was afraid we would be forced down and maybe held down before gaining a favorable attack position. Attempted several times to contact CTF 71, and finally received the r/o ahead from NMI. Transmittes the message but received no receipt. The then sent the message out on the area frequency.

0700 (E) Base course of convoy changed to the left, from about a south westerly course to a southerly course.

0852 (E) Obtained position ahead of convoy, distant about 20 miles. Submerged. Went to 300 foot to obtain bathythheromograph card. Found a pronounced 10° negative gradient starting at 150 feet and extending through 300 feet.

0913 (E) Returned to periscope depth. Sighted smoke of convoy. Reading in for attack.

0946 (E) Went to battle stations.

0950 (E) Sound picked up 3 different ships pinging, long scale, automatic, on 17.2 kilocycles.

0957 (E) Board four distant depth charge explosions, followed in about a minute by two more. The convoy appeared to be smoking heavily, and also appeared to be scattering.

1020 (E) The convoy appeared to have returned to normal.

— page 92 —
1030 (H)
Counted at least 15 ships, two of which were tankers, four escorts, and the remainder of the ships appeared to be of landing craft type. Two destroyer escorts were patrolling back and forth ahead of convoy, another escort could be seen on either flank. One escort was noted to have a bed spring radar antenna. The convoy was zigzagging on base course 1850T, speed 9 knots. On the port flank was a large freighter transport and two medium sized tankers. Picked them out as my targets.

1110 (H)
Began to have escort trouble. They were pinging continually, and on several occasions were heard to tune their pingers. At this time the port bow and port flank escorts were near me, and appeared suspicious. Decided to fire Mark 18's from stern tubes, and then turn to fire Mark 23's from bow tubes, hoping the 18's would run properly and not give away my position.

1145 (H)
We were dead ahead of large freighter, angle on bow zero, distant about 3000 yards. Changed course for 90 port track stern tubes, and went to 100 feet to pass under port flank escort.

1155 (H)
Ferriscope depth. Escort clear, about 1500 yards on my starboard quarter. Obtained set-up and single ping range on freighter and at

1200 (H)
With a 90 port track, zero gyro angle, and torpedo run 2400 yards, fired 3 mark 18's set at 10 feet, using a 20 divorgant spread. Obtained a chock bearing before firing each torpedo. Then shifted to tanker which was overlapped by two other ships and fired fourth torpedo. Commenced swinging with right rudder.

1202 (H)
Target zigged about 300 toward.

— page 93 —
1206 (E)
Heard four explosions, about 10 seconds apart, which sounded like distant depth charges on bombs. No hits seen in any targets. Convoy made big zig to right and commenced smoking heavily. For the next 20 minutes about 18 depth charges or bombs were dropped at random. They sounded 2 or 3 miles distant, but could not be seen through periscope, although three escorts were in sight. Fired they were probably depth bombs being dropped by plane, so went to 150 feet and completed course change.

: 1220 (E)
Periscope depth. Two escorts milling around, distant about 4 miles. Either they had left convoy to look around, or else were trailing escorts. Convoy still in sight, smoking heavily, heading away. Convinced trailing on course 1000, which had been base course of convoy.

: 1335 (E)
Although target zigged after firing, I figured at least one of the three torpedoes should have been hit. Also, I couldn't understand how the fourth torpedo could possibly have missed, with such a large overlying target. Checked TNT and found we did not have correct solution on firing, making an error of 20 - 30 in gyro angle. (See under major defects). Difficulty was encountered also in getting bow tubes ready for firing. (See under major defects).

: 1407 (E)
Heard distant depth charge bearing approximately ahead.

: 1417 (E)
Heard two more depth charges.

: 1711 (E)
Lost sight of the two patrol boats.

: 1737 (E)
Heard about 146 depth charges bearing about 1850T. Believe this was the result of the BOMB!S attack on the convoy.

: 1810 (E)
Surfaced and convinced chasing convoy at 17 knots. By estimate was that they were heading for Palawan Passage, and we would contact them about 2300.

— page 94 —
1904 (H) Interference on the "SJ" radar apparently another very distant "SJ". Interference disappeared at 1923 (H).

: 1940 (H) Sent my second contact report on convoy.

: 2013 (H) Picked up interference on "SJ", and at 2040 (H) exchanged recognition signals by means of radar with unidentified submarine, probably the BECUNL.

: 2117 (H) Received BECUNL'S attack report, which when plotted, indicated convoy had headed south westerly after our attack.

: 2342 (H) Convoy not contacted. Changed course to 2900T and commenced search on basis that convoy had changed course to the South West.

: 10 October 1944

: 0140 (H) Received EMBILL'S message of attack on convoy near entrance to F.L.N. Passage. I had out-quested myself. If I had co.timed the search to the South I would have no doubt picked up the convoy. Now it was too late.

: 0148 (H) Changed course to 0300T to pass through scene of BECUNL's attack, and to search for possible cripples heading back to Kenilla. Decided that since EMBILL and BECUNL were going through Mindoro Strait tonight, I would spend the day patrolling this area and go through Strait tomorrow night.

: 0542 (H) Interference on "SJ" radar. Exchanged recognition signals by radar with unidentified submarine, later discovered to be BECUNL.

: 0603 (H) Sighted and exchanged calls with BECUNL. Told BECUNL we were leaving area tomorrow.

: 0726 (H) Plane contact 25. "SD" contact on two planes, distant 3 miles. Not sighted from bridge. Submerged and went deep. No depth charges dropped. Conducted submerged patrol for 12-miner of day.

— page 95 —
1619 (H) Surfaced end set course for Windsor Strait.

11 October 1944

0242 (H) Sighted Cape Celavite bearing 0470T, distant 31 miles.

0516 (H) Submerged. Set course for Windsor Strait.

0618 (H) Plane contact #26. Sighted twin float, single engine type "Jarko", heading south along coast, elevation about 1500 feet.

0843 (H) Plane contact #27. Sighted float plane type "Rufe" heading south along coast.

0854 (E) Plane contact #28. Sighted a second float plane type "Rufe" heading south along coast.

1013 (H) Ship contact #11. Sighted masts of three ships, bearing 0.39T, distant about 8 miles. They were carrying 75 tons of gasoline, 75 tons of oil, and 75 tons of coal. They were heading south along coast.

1535 (E) Plane contact #29. Sighted two single engine float planes type "Rufe" heading south along coast.

1543 (H) Flt. contact #30. Sighted single engine unidentified land plane heading south along coast.

1610 (H) Plane contact #31. Sighted single engine land plane similar to contact #30, heading north along coast.

1628 (H) Surfaced about six miles off the beach in Apo East Pass. Went ahead 16 knots on two engines.

1903 (H) Ship contact #12. Flicked up signal light on port beam. Coached radar or, and it picked up contact of small ship, distant 7 miles. The contact began to close us, and the signal light became more visible. The boat would signal for a few minutes, then stop for a minute or so. With us making 16 knots he was

— page 96 —
1903 (H) closing, so went to four engine speed and soon dropped him behind. Picked up two more lights to port further on that appeared to be signalling, but redar could not pick them up so assume they were on the beach.

1930 (H) Ship contact #13. Picked up what appeared to be signalling from small boat in the channel between Ambulon Island and the five fathom bank. Changed course to right and passed between five and ten fathom bank, avoiding light.

12 October 1944

0517 (H) With Nase Point, Paray Island, bearing 0750T, distant 14 miles, submerged to conduct patrol on a southerly course.

1816 (H) Surfaced. Panay and Tegros Islands in sight.

2300 (H) Sent my serial three to Task Force Seventy One.

13 October 1944

0100 (H) Lt. 8-12 N, Long. 120-58E. Encountered weak interference on the "SJ", but it did not get strong enough to exchange recognition signals.

0128 (H) Encountered weak interference on "SJ" from direction of Unsang Point, Borneo. The interference appeared to be a steady signal and covered a rather broad bearing. No answer was received from our attacker to exchange recognition signals.

0557 (H) Submerged. Timing our advance to pass through Sibutu Passage after dark.

0814 (H) Ship contact #14. Lt. 6-56 N, long. 120-15 E. Sighted U.S. Submarine, distant 6 miles, on southerly course. It appeared to be making high speed, and soon disappeared from sight.

— page 97 —
1544 (H) Surfcoed, end hooked for Pearl Bank.
: 1902 (H) Passed Pearl Bank light ahead to starboard, distant 6 miles.
: 2149 (H) Passed Bongo Island ahead to port, distant 7 miles.
: 2155 (H) Radar detector picked up weak sweeping signal on 176 megacycles.
: 2200 (F) Signal was getting stronger, and appeared to have picked up.
: 2210 (H) The signal on the radar detector reached its maximum strength. It was extremely strong, steady and right on us. Our position at the time was 10 miles bearing 2400 from the peak on Bongo Island.
: 2215 (F) Enemy radar lost contact on us, and began sweeping again. At 2220 (H) radar detector lost all contact with the signal.
: 2228 (H) A brilliant glow of light suddenly appeared behind Thumb Hill on Tawitawi Island. The light lasted for about four minutes, then suddenly went out. It did not appear to be the glow of a searchlight and my guess at the time was that it was the running lights on an airfield. However, no planes were picked up by the radar detector during the night.

14 October 1944

0632 (H) Plane contact "32. Plucked up by "SD" radar, distant 13 miles, closing rapidly, so at
0633 (H) Submerged, with contact distant 11 miles. Identified submerged for remainder of day, and held "Crossing the line" ceremony. Five of the ten officers on board were shellbacks, and only seventeen of the seventy three enlisted men.

1807 (H) Surfacod.

— page 98 —
1842 (H) to 1958 (H)
Near entrance to Makassar Strait picked up contacts on the "SJ" which had us going in circles for well over an hour. These contacts were finally determined to be "boogies". There was a lot of lightning around the horizon at the time, which may have been the cause.

2113 (H)
Radar detector encountered interference on 155 megacycles. This was a weak sweeping signal, and persisted for about 15 minutes. Our position, lat. 1-45 N, long. 119-29E.

15 October 1944
0109 (H) to 0150 (H)
Radar detector encountered sweeping interference on 176 megacycles. The signal was weak to moderate in strength, and swept every 10 seconds. The nearest land at this time was South Webster Island bearing 1320T, distant 27 miles. It is believed there is a shore based radar in that vicinity.

1219 (H)
Our position was 23 miles bearing 3060T from Cape William lighthouse, so submerged for remainder of the day to avoid detection.

1833 (H)
Surfaced with Cape William lighthouse bearing 0790T, distant 17 miles. Large fire burning on Cape Mander.

1957 (H)
While maneuvering to avoid a sailboat picked up by radar at three miles, almost collided with another sailboat. Finally got clear at four engine speed.

16 October 1944
0205 (H)
Ship contact #15. Encountered interference on "SJ" first then made contact bearing 1680T, distant 6 miles. The interferance from the other radar was similar to our own "SJ", and seemed to be steady on us. Attempted to exchange recognition signals with no luck. Believe this was one of our own subs, on course 0350T, speed 12 knots. Passed it about 6 miles abeam, and lost contact about 15 minutes later. Our position lat. 4-25 S, long. 117-45 E.

— page 99 —
0530 (H) Sighted Sibaru and Lima Islands, bearing 2850T, and 2970T, distant 11 miles.

: 0625 (H) Sighted a sailing "vinte" hull down. It did not see us, so did not investigate, as it was near islands.

: 0827 (H) Sighted another sailing "vinte" on starboard bow. Limited 20 MM and altered course to investigate.

: 0651 (F) Passed close aboard "vinte" which was lug rigged, about 30 feet long, and manned by 3 men, 2 women and 2 children, not Japanese.

: 1250 (F) Investigated small dug-out canoe, which was empty.

: 1330 (H) Plane content #33. Sighted dead eastern, distant about 10 miles, on southeast course.

: 1331 (H) Submerged.

: 1454 (H) Surfaced.

: 1610 (F) Sighted Sekala Island, bearing 2820T, distant 22 miles.

: 1813 (H) Visibility poor, due to low haze. Although Belli and Lombok could not be seen, they were picked up by radar, distant about 45 miles.

: 2145 (H) Entered Lombok Strait, and increased speed to 18 knots. Visibility was poor, but the radar worked like a chern. The picture of the Strait was as clear as a picture on the FPI, making the navigation very simple. No ship contacts were made during the passage, and only one light was sighted, that on the S.N. coast of Nusa Besar Island.

: 2347 (H) Cleared Lombok Strait. Radar detector picked up weak signal on 196 megacycles, which persisted for the next hour.

— page 100 —
17 October 1944

- 1908 (H) to 2114 (H)
- 2238 (H)
- 2247 (H)
- 2332 (H)
- 18 October 1944
- 1919 (H)
- 1930 (H)
- 19 October 1944
- 0340 (H)
- 0346 (H)

---

**Subj:**
U.S.S. C.V.I.L.A. Report of Second War情报.

---

**17 October 1944**

Rad ships interference on the S-J radar,
let, 13-28 S long, 115-59E. This was a weak
sweeping signal and apparently never tried
steadily on us. It times it appeared to
be two separate radars operating on about
the same bearing, but slightly different
pulse repetition frequencies. It turned to
exchance recognition signals, but was
not successful.

Interference on the S-J again on about the
same bearing, but this time it lasted for
only about 10 minutes.

Radar detector contacted a weak sweeping
signal on 198 megacycles, this signal re-
mained weak and continued intermittently
for several hours.

Some interference as before contacted on
S-J. This time it lasted for about an hour.

Radar detector contacted a weak sweeping
signal on 198 megacycles, let, 18-55 S
long, 113-15 E. The signal became very
strong every 3 to 5 minutes at it the
antenna was trained towards us at these
intervals.

Two different stations were picked up on
198 megacycles, the second one very weak.
Both could be heard until 2200(H).

The S-J radar made contact on three peaks
of land, bearing 1310 - 1380T, distant
45,000 yards. According to our DR the
closest land should have been North West
Cape bearing 1310T, distant 95 miles.

Reversed course and set star fix to
establish our position. The fix, and a
sounding at the same time, showed us to
be within a couple miles of the DR.

— page 101 —
20 October 1944
1522 (H)
21 October 1944
0037 (H)
0447 (H)
1001 (H)

Subject: U.S.S. CAVILA Report of Second War Patrol.

Nevertheless, altered course to the westward until we could get a morning twilight fix. This fix showed North West Cape bearing 1250', distant 97 miles; this fix also agreeing with the DR. In the meantime, the contacts, which were good steady pips, remained on the S-J until the range by radar was 67,000 yards.

This was one of the most baffling things I've run into. I have no explanation for this strange phenomenon, but the following is offered by the Radar and Communication Officer: The radar indicated a range of 45,000 yards, whereas the actual range was 190,000 yards to the nearest high land, a 1000 foot peak on North West Cape. A portion of the radar beam was apparently referred down over its normal horizon and reflected along an approximately reverse path by this 1000 foot ridge. The beam must have been bent by a heavy ion layer to give the ninety five mile range obtained.

Sighted and exchanged calls with MUSELLINGE.

S-J cont' at on target, belived to be friendly sub on patrol, on opposite course. Also had interference from targets S-J, but was unsuccessful in exchanging recognition signals.

Made rendezvous with escort. Before entering port, bore-riding party came aboard, ran surface sound test, and ran magnetic range.

Hoor'd starboard side to nest clong; U.S.S. SURYALE.

— page 102 —
U.S.S. CAVILLA  Report of Second War Patrol.

:  (a)  NEUTER

During the period on station operating with the "zob", the sky was overcast during the greater part of the time. This not only made navigation difficult, but also made it very narrow wracking searching for places. Glassy seas and bright moonlight nights were encountered in Convoy College. Enroute to Isle the weather was clear and the seas calm. No rough weather was encountered until we cleared Lombok Strait.

(D)  TIDAL INFORMATION

In the vicinity of Iat, 24-37 N, long. 127-30 E a very constant and persistent current was observed during the period 21 - 25 September. This current averaged 0.95 knots, set 1510N. Several large tide rips were observed in the vicinity of Iat, 20-27 N, long. 119-54 E, which when first sighted, appeared to be shoal waters. All other currents encountered conformed with the pilot chart.

(E)  NAVIGATIONAL AIDS

No navigational lights were sighted. All other aids conformed with the Coast Pilots.

— page 105 —
1. U.S.S. C.V.III. Report of Second Periscope Patrol.

(c) LIGHT CONTROLS

CONTROL NUMBER | 1 | 2 | 3 | 4
---|---|---|---|---
Date    | 8-31 | 9-6 | 9-6 | 9-6
Time (noon) | 1604 | 1433 | 1619 | 1636
Position: Lat. | 06-21 | 16-46 | 16-36 | 10-35N
U.S.    | Low. | 170-7 | 147-005 | 146-372 | 146+35
B    | Speed | 15 kts | 13 kts | 13 kts | 13 kts
C    | Course | 3530 | 2560 | 2560 | 2560
R    | Trim | 5.0 | 5.0 | 5.0 | 5.0
R    | Time, Since Last | 0 | 0 | 0 | 30
R    | 6D Radar Search | 0 | 0 | 0 | 30

Number | 2 | 1 | 1 | 1
Type | SED | B-26 | B-26 | B-26
Probable Mission | 1st | Trans | 1st | 1st
Tonn Contacted | Sight | Sight | Sight | Sight
Initial Range | 15 mi | 12 mi | 12 mi | 12 mi
Elevation Angle | 20 | 20 | 30 | 30
Range & Height to | HD | ND | ND | ND
Bearing of Enemy | 0/1
from It Detected | 0/1

(State/Dept. | 5 | 3 | 3 | 2
Soc. | Fort) | 2000 | 00 | 00
(Direction(cal) | 25 | 25 | 25 | 20
Visibility (ft) | 1500 | 1000 | 1000 | 1000
Clouds (Forecast | 40% | 40% | 40% | 40%
(Overcast | | | | |
(Beating (Cal) | Day | Day | Day | Day
Moon (Angle | | | | |
(Incident | | | | |
Illum. | | | | |

- 36 -

— page 106 —
U.S.S. C.V. III. Report of Second War Patrol.

| CONT. CT NUMBER | 5 | 6 | 7 | 8 |
||----|----|----|----|
| Date          | 9-6 | 9-9 | 9-9 | 9-10 |
| Time (Zone)   | 1713K | 1752I | 0927I | 0731I |
| Position: Let. | 16-34N | 14-50T | 14-51M | 15-16M |
| Long.         | 14G-25S | 14-05S | 14-25S | 138-24S |
| Speed         | 13 kts | 13 kts | 12 kts | 13 kts |
| Course        | 2560 | 2760 | 2760 | 2530 |
| Trim         | Surf | Surf | Surf | Surf |
| Minutes Since Last | Surf | Surf | Surf | Surf |
| SD Radar Search | 66 | 84 | 1 | 1 |

| Number | 3 | 1 | 1 | 1 |
| Type  | B-26 | PBN | B-24 | Meris |
| Probable Mission | Trues | Pet | Pet | Pet |
| How Contested | Sight | Sight | Sight | Sight |
| Initial Range | 15 mi | 16 mi | 9 mi | 18 mi |
| Elevation Angle | 130 | 30 | 10 | 20 |
| Range & Relative Bearing of Flare | ND | ND | 9 mi | 14 mi |
| on It Detected | 600 | 1900 | 600 | 1900 |

| (Stcto (Bona-Soc: fort) | 2 | 2 | 2 | 1 |
| (Direction (Rel) | 00 | 3400 | 3400 | 1200 |
| Visibility (Miles) | 20 | 25 | 25 | 30 |
| (Fleight in Ft. | 1000 | 1000 | 1000 | 1000 |
| Clouds: (Forecast | 50% | 60% | 30% | 30% |
| Overcast | Day | Day | Day | Day |
| (Bearing (Rel) | Day | Day | Day | Day |
| "Boon: (Angle | Day | Day | Day | Day |
| (Fcrcnt | Day | Day | Day | Day |
| Illum. | Day | Day | Day | Day |

— page 109 —
17 18 19 20
Date: 9-25 9-25 9-26 9-27
Time (Zone): 0619(I) 0919(I) 0839(I) 0614(I)
Position: Lat. 24-55N 24-39N 22-47N 22-39N
Long. 127-40E 127-31E 124-32E 122-14E
Speed: 11 kts 11 kts 11 kts 11 kts
Course: 0650 2350 2650 2700
Trim: Surf 0 0 0 10 hrs
"Ins. Since Last SD Radar Search"

Number: 1 1 1 1
Type: Unk Unk Unk Unk
Probable Mission: H Radar Radar Radar Radar
How Contacted: 22 mi 18 mi 11 mi 16 mi
Initial Range: 30 Unk Unk Unk
Elevation Angle: 22 mi 1500 Unk ND ND

Range & Relative Bearing of Plane when It Detected S/A: 2 2 0 0

(State (Beaufort) 0450 2000 - 50
Sea: (Direction (Rel) 30 30 20 50
Visibility (Illes) 3000 3000 1500 3000
(Height in ft. Overcast 5% 5% 30% 10%)

Clouds: (Pertinent Overcast Day Day Day

(Bearing (Rel) Day Day Day
Moon: (Angle (Percent
(Tercent
Illum.

— page 110 —
U.S.S. CAVALIA  Report of Second War Patrol.

Subject:  CONTACT CONTACTS

| CONTACT NUMBER | 21 | 22 | 23 | 24 |
||----|----|----|----|
| Date         | 10-1 | 10-1 | 10-5 | 10-5 |
| Time (Zone)  | 0911(I) | 1800(I) | 0020(I) | 0221(I) |
| Position: Lat. | 20-50N | 19-47N | 20-00N | 20-02N |
| Long.        | 123-33E | 123-39E | 120-10E | 119-58E |
| Speed        | 11 kts | 11 kts | 14 kts | 14 kts |
| Course       | 1580T | 1150T | 2400T | 2700T |
| Trim        | Surf   | Surf   | Surf   | Surf   |
| Minutes Since Last | 0 | 1/2 | 5 hrs | 2 hrs |
| 3D Radar Search |  |  |  |  |

Number: 1
Type: 1
Probable Mission: 1
. . . Contacted: 1
In: 1

— page 111 —
U.S.S. CAVALRY II
Report of Second War Patrol.

(C) AIRCRAFT CONTACTS

CONTACT NUMBER: 25 26 27 28

S Date: 10-10 10-11 10-11 10-11
U Time(Zone): 072E(1) 0618(H) 0653(H) 0654(H)
B Position: Lat. 13-10N 12-54N 12-50N 12-50N
K Long. 117-54N 120-29E 120-28E 120-28E
A Speed 14 kts 3 kts 3 kts 3 kts
R Course 0300(T) 1250(T) 1250(T) 1250(T)
I Trim Surf Per. Per. Per. Per.
N Minutes Since Last
E SD Radar Search 0 60 3 hrs 3 hrs

Number 2 1 1 1
Type Unk. Jake Rufe Rufe
Probable Mission I Pat Pat Pat.
How Contacted Radar S S S
Initial Range 3 mi 3 mi 6 mi 5 mi
Elevation Angle Unk. 30 40 30

Range & Relative Unk. ND ND ND
Bearing of Plane
then It Detected
S/M

(State(Beau- 1 0 0 0
Sea: fort)
(Unrection(rel) 0 -  -  -
Visibility (ft) 30 20 20 20

(Height in 1500 1500 1500 1500
Clouds: Ft.
(Percent 10 10 10 10
Overcast
(Referring(Rel) Day Day Day Day

(Angle
Koon: (Percent
Illum.

— page 112 —
U.S.S. CAVILIA Report of Second War Patrol.

(G) AIRCRAFT CONTACTS

CONTACT NUMBER | 29 | 30 | 31 | 32
---|---|---|---|---
Date | 10-11 | 10-11 | 10-11 | 10-14
Time (Zone) | 1529(H) | 1543(H) | 1610(H) | 0632
Position: | 12-44N | 12-44N | 12-43N | 92-37N
Long. | 120-42E | 120-42E | 120-42E | 119-30R
Squad | 3 | 3 | 3 | 15
Tribe | 1250 | 1250 | 1500 | 2300
Unit: | Per | Per | Per | Surf
S/N | 10 hrs | 10 hrs | 11 hrs | 0

A | Number | 2 | 1 | 1 | 1
I | Type | Rufe | Hap | Hap | Unk.
R | Probable Mission | Pat | Trans | Trans | Unk
R | How Contacted | S | S | S | R
R | Initial Range | 7 mi | 5 mi | 6 mi | 13 mi
R | Elevation Angle | 30 | 40 | 40 | 40
F | Range & Relative | ND | ND | ND | ND
T | Bearing Of Plane | | | | |
S/M | when It Detected | | | | |

CONDITIONS:
(State(Beaufort) | 0 | 0 | 1
Sea: (Direction(Rel) | - | - | 1350
Visibility (Mi) | 30 | 30 | 30 | 20
(Height in Ft. | 2000 | 2000 | 2000 | 1500
Clouds: (Percent | 10 | 10 | 10 | 20
Overcast | | | | |
(Bearing(Rel) | Day | Day | Day | Day
Hoon: (Angle | | | | |
(Present | | | | |
Illum. | | | | |

— page 113 —
U.S.S. CAVIL. Report of Second War Patrol.

Subject:  U.S.S. CAVIL. Report of Second War Patrol.

(C) AIRCRAFT CONTACTS

CONTACT NUMBER: 33

Date: 10-16
Time (Zone): 1330(H)
Position: Lat. 06-45 S
Long. 116-45E
Speed: 15
Course: 1500
Trim: Surf
Tins. Since Last SD Radar Search: 1

Number: 2
Type: Rufe
Probable Mission: Pat
How Contacted: S
Initial Range: 7 md
Elevation Angle: 30

Range & Relative Bearing of Plane When It Detected S/M: ND

(St. to(Beau- 0
Sea: fort)
(Circulation(Rel) -
Visibility (HI) 30

(Height in 2000
Clouds: Ft.
(Porcent 10
Overcast
(Bearing(Rel) Day
Moon: angle
(Percent
Illum.

— page 114 —
U.S.S. CAVALIA  Report of Second War Patrol.

(H)  Torpedo Attack Report Form

U.S.S. CAVALIA  TORPEDO ATTACK NO  1  PATROL NO.  2

Date 1200 (H)  Date October 9, 1944  Lat. 13-12 N. Long 118-21E

Target Data - Damage Inflicted

Large convoy consisting of at least 15 ships, or which two were 40's, five 4's, two landing craft type and 6 destroyer and patrol boat escorts.

The convoy was contacted by sight at daybreak just prior to the "dawn" zig of 400 course change to the left.

The visibility was excellent, the convoy was sighted and tracked at a range of about 40,000 yards.

Ships Damaged or Probably Sunk  None

Damage Determined by 1o damage

Target Draft  14 feet;  Course 1200(T);  Speed 9; Range 2,000 yds

Own Ship Data

Speed  3 knots; Course 0300(T); Depth 64 feet; Angle 10 down

Fire Control and Torpedo Data

Type Attack  A periscope depth, stern tube attack was made. The value of Mk 18-1 torpedoes as an aid in avoiding detection was proven in that the convoy reacted as if they only suspected that an attack had been made.

A single ping range was obtained just prior to firing, this checked the solutions obtained by TDC and FLOT.

The fact that all torpedoes missed is believed due to a combination of target zig to left 2 minutes after firing, and failure of torpedo data computer, which introduced error of 2 or 3 degrees in gyro angle.

— page 116 —
7 8 9 10
Torpedo Attack No. 1
Miss 87-30P 88-30P 86-00P 71-30P
Torpedo Angle 182-30 181-30 184-00 198-30
North Set 10' 10' 10' 10'
Taper - - -
Miss Miss Miss Miss
'0' No No No No
1'-1 18-1 18-1 18-1
'4 54526 54359 54379
8-5 8-5 8-5 8-5
8356 8531 8416 8001
Contact Contact Contact Contact
Torpedo Actual - - - -
H, Hand 18-1 18-1 18-1 18-1
Serial No. 1980 1557 1340 1926
Explosive Torpex Torpex Torpex Torpex
Firing Intervals 10 sec 10 sec 10 sec -
Type Spread Divergent Divergent Divergent Single
Sea Conditions Moderate sea and swell

Covrhaul Activity - U.S.S. PUSHELL
Remarks: It is believed the torpedoes missed due to a combination of target zig to left 2 minutes after firing, and failure of torpedo data computer, which introduced error of 2 to 3 degrees in gyro angle.
At the end of 6 minutes after firing, four high speed explosions were heard at even specings of about 3 seconds. These were very possibly the torpedoes detonating at the end of their runs.

— page 117 —
1. U.S.S. O.V.III. Report of Second War Patrol.

(I) NIMS
None observed.

(J) ANTI-SUBMARINE SUB-SONIC AND W.SONIC TACTICS

The scariest with the once convoy sighted were pinging continuously on 17.2 kilocycles long scale, and on several occasions seemed to tune their pingers. One escort which I passed within a 1000 yards of, appeared to have all hands on topside cating as lookouts. The depth charging following my attack was more for its nuisance value than anything else, because the escorts did not know where we were, and pinging was still on the long scale. The plane which attacked us earlier in the patrol, slipped in behind the heavy cloud cover, and was upon us before being sighted or picked up by radar. At the time, the "SD" was being keyed every minute. Since that time we key the "SD" every 1/2 minute. If time permits, a quick turn to the right before diving might have done in the plane's mind whether you are friendly or enemy. In our case, I believe it did. Reder equipped planes were known to be searching. Convoy colls. or during the night, although the moon was very bright, and there was a tempection to use the "SD", it was left scoured, and we relied on the dutctor. This worked fine, enabling us to pick up enemy radar, and with the aid of an oscilloscope which we had hooked up with the detector, we could tell when the enemy had detected us, and dive in sufficient time.

(K) MAJOR DEFECTS AND INJURIES

1. HORROR AND ILLNESS

(a) The bridge gyro projector flooded during deep submergence on 4 September. Water was found to have entered around the stuffing tube where the cable entered the reactor housing, and was believed to have been caused by the working of the cable when tilting the reactor. A new cable was installed, and repairs made by the HOLLAND at Saipan on 7 September.

— page 118 —
9090 KCS - best call around frequency. Suffered from fading only at sunrise and sundown.

(a) 14930 KCS - normal daytime frequency, strength good. Receiver, it also faded at sunrise and sundown.

(c) 17370 KCS - extreme fading, not very good results.

(f) 2850 KCS - not guarded, not enough receivers available, until after we left station and well-peaked.

(g) 2006, 21C2, 2160, 2204 KCS (Fack frequencies) - the reception on all these frequencies was approximately the same and uniformly good.

Accept for the two instances cited below, no difficulty was encountered in our transmissions.

(c) 32219 of October - Turned on 12705 and called, but received no reply. It read frequency slightly to clear on reply. After that, we no longer heard NM and never received a receipt for our message. Message was then sent out on the air frequency (2680), but no receipts were received. It is doubtful if anyone received this message. Possibly some Jap assumed NPM's call and sent us the K on the first circuit, and then did not open up again.

(b) 091039 of October - Tuned on 8470 KCS to send urgent despatch to VLO. No response, so called NQ and received no response. Held NPM working. Another boat on the frequency, so zero beated and waited for other boat to finish. Called NPI, but another boat with an CP message received a go check from NPM. Tried to cut in on circuit, but NPM did not acknowledge. Waited until this despatch was completed and again called NPM and received a go ahead. Sent message, NPM receipted and authenticated. Seven minutes later, VLO sent out our message on Baker Fox, apparently they had received our message, but we could not hear them.

— page 119 —
1. RADAR
1. S-7 leader - The operation of this gear was excellent. Lance was picked up at approximately 50 miles, a sailboat at 4 miles, a submarine at 7 miles, and a plane tracked out on the PTI to 16 miles. However, many "boogies" were encountered which soon caused the expression to be coined "stations for radar flailing". Several nights when the sea was practically glassy with very light swells, contacts were made from 950 to 1500 yards. The ships appeared to be sharp and clear, but nothing could be seen from bridge. North of Leikassar we encountered our maximum "boogie" trouble. Many contacts were made, varying from 6,000 to 20,000 yards the night of 14 October

— page 120 —
7 September, The trouble was located in a loose contact on the variable condenser attached to the "Range Zero" adjust knob on front of the indicator. The connection to terminal #4 was also tightened.

(a) FIX sweep disappeared along with the transmitted pulse on the "A" scope on 8 September. A check on the output of the bias generator circuit in the transmitter receiver showed that coil II was open. A 340 volt full wave rectifier was converted to a 700 volt half-wave rectifier. Spare condensers for the F.V. rectifier were used in the filter circuit. The positive lead was tied to ground and the negative was tied to terminal 42. The coil and tube V1 were removed from the circuit. The break in II was located near one of its terminals and it was replaced by solder.

(b) Replace V2 tube in the transmitter receiver on 12 September.

(c) On 13 September a bad jitter appeared on the "A" scope and "Range Zero" adjust test control of the proper range. The trouble was traced to V510 in the range unit which had a low conductivity and was not delivering a large enough pulse to the range indicator. The "Pre-knock" was readjusted, jittering stopped, and the "Range Zero" was in proper adjustment.

(d) On 23 September repair short in the cable to jack 5A in the range indicator.

(e) Replaced a glassy 5D21 tube on 24 September.

(f) On 30 September replaced two 5U4G rectifier tubes.

(g) Room ranges which were obtained on 4 October were found to be accurate by a defective 5F21 tube which was replaced.

2. The Radar - Up to 24 September, three out of ten plane contacts were picked up by the SD. On 10 September contact was made at 18 miles. In this case, the plane had an elevation of 3 degrees. The contacts which were missed, except for one, were:

- 53 -

— page 121 —
3. Radar Detector - At the beginning of the patrol much inter-race was picked up on the detector from our own ship. For example, it was discovered that the VW trnsmitter caused interference at 133 KOFFS. The "SW" used interference at 310,610 and in the range of 500 to 550 KOFFS, being especially strong at 545. We soon learned to dis-connect the antenna when we got interference, thereby learning whether the interference was inside or outside the ship. From then on the detector was a nice thing to have. Radar equipped XO planes were picked up at 150 - 152 MOPS, a shore base radar in Sibutu Pass at 176, and a similar one near South Easter Island.

(N) Scound Gr and Sound Conditions

The operation of all sound gear was satisfactory. The one large contact made on this patrol was picked up by the VW and the JAC at about 13,000 yards, and by the JP at 20,000 yards. A single ping range was obtained by the JC on a large transmitter, range 2900 yards, the only ranging attempted on this patrol. The tuning of the VW was changed to listen for enemy ping, which was found to be on 17.2 KOFFS. The VW had vibrations both on the surface and submerged, this vibration being felt throughout the ship. During the last refit an attempt was made to remedy this, but it was not successful.

(O) Density Layers

The following density layers were noted:

| Date | Time | Position | Density |
|------|-------|||
| 9 Sep 1944 | 1900(K) | 15-02N 141-41E | Isothermal to 140 feet and a seven degree negative gas distant from 140 feet to 280 feet |
| 30 Sep 1944 | 1845(T) | 22-33N 122-46E | Isothermal to 140 feet and a ten degree negative gradient from 140 feet to 260 feet |

— page 122 —
9 October 1944  U.S.S. C.I.V. L.I.A. Report of Second Patrol.

| Date | Time       | Position | Remarks |
|------||||
|      | 9 October 1944 | 1200(H)  | 13-13N  | Isotherm: 150 feet and a nine degree negative gradient from 150 feet to 280 feet. |

(P) **Food and Habitability**

The list and habitability was excellent. Only one had a qualified to the sick list, diagnosis, gastroenteritis, acute. Of the very few injuries sustained, only one was serious enough to require treatment, that a cut lower lip which required two stitches. There were the usual routine treatments given for minor ailments and complaints. The food available in Mejuro was not up to standard, very few fresh provisions available, and the meats very poor.

(Q) **Personnel**

Performance of duty of all hands was excellent. School of the boat was conducted by the unqualified officers for the unqualified enlisted men, and the results obtained were very good. Of the 73 men on board, 51 were qualified at the start of the patrol. During the patrol 16 more were qualified, and 7 were advanced in rating.

(R) **Hills Steamed - Fuel Used**

| Miles Steamed | Fuel Used |
|||
| 2650           | 33,498    |
| 970            | 11,760    |
| 5360           | 41,274    |
| 3200           | 42,211    |

(S) **Duration**

Days enroute to area (From Mejuro) 12
Days in area 28
Days enroute to base (Preemantle) 13
Days submerged 15

(T) **Factors of Endurance Remaining**

| Torpedoes | Fuel | Provisions | Personnel |
||------|||
| 20        | 7000 | 20 days    | 10 days   |

Limiting factor this patrol - Orders.

— page 123 —
U.S.S. CAVILA' Report of Second War Patrol.

(U) Radio end Reader Countermeasures

Radio - :t this depends signals were heard on all of the frequencies used during the patrol, but only in a couple of cases did this approach deliberate jammed. Most of the interference found seemed to be intermittent signals as on a very lightly used circuit, with no apparent times of normal use.

S-J Radar - The only interference which definitely appeared to be from a source other than another S-J radar was encountered on 4 October. The true bearing from the PPI indicated radiation from Ballentang Island. :is far as could be determined by changing the pulse repetition frequency of the S-J, the pulse repetition frequency of the interfering radar was about 2000 cycles per second. Pulse shape had same appearance as that from another S-J.

SD Radar - On 24 September, in lat. 24-38 N, long. 127-30 E, two pipes were noted at the extreme end of the range scale. They moved about erratically, then the entire scale was filled with strong signals. The base line moved up and down as the signal diminished and increased. The strength of the jamming was not constant, but it appeared that the enemy was using a "look-in" receiver. At no time could echoes have been seen, and no operational procedure used was effective. Changing gain and varying the frequency was of no help. Maximum strength occurred every 5 to 10 seconds. The jamming appeared to be of the noise-multiplied type.

RBO - All of the better radio programs were very effectively jammed. Tokyo could be heard very well, and the only U.S. broadcast that we could depend on hearing was "Victory for the Philippines".

(7) RPLAKS

Numerous Wolf Packs on the same circuit made a split phone watch difficult to stand, as it frequently cut in on an NAM message. For ease in pick communications, it is believed that separate

— page 124 —
U.S.S. CLV.III Report of Second War Patrol.

frequencies for the various pocks would ease the guard on the circuit and also make Japanese jamming of those frequencies more difficult because of the multiple channels. One pack or pocks in the same area could be assigned one set of frequencies. The present system is good for inter-pock communication, but wider dissemination of the various pock calls would improve the communications. For submarines scheduled to report to CTF 71 for refit it is recommended that a copy of CTF 71 "Code Names" be included in their operation order, thereby enabling them to know from the dispatches on the way down where the "action" is taking place.

- 57 -

12 07:51

— page 125 —
15/16/16-3
Serial 0203
CONFIDENTIAL

FIRST TRANSCRIPT TO:
U.S.S. CAVALIA (SS244) - Report of War Patrol
Report of Second War Patrol

From: The Commander Submarine Squadron EIGHTEEN, San Francisco, California, 23 October 1944.

To: The Commander Submarines, SEVENTH FLIGHT.
Via: (1) The Commander Submarines, SEVENTH FLIGHT.
(2) The Commander SEVENTH FLIGHT.

Subject: U.S.S. CAVALIA (SS244) - Report of War Patrol
Number Two.

1. During this second war patrol, the CAVALIA was a member of a coordinated search and attack group comprised of PIRANHA, RACONACK and CAVALI under command of Commander R.S. Fenson, U.S. Navy, in RAZORBACK. Enroute from MAJURO the group refused at SAITAN and then took station on a scouting line north of PALAU, for a period of thirteen days after which station was shifted to the vicinity of JUZON STRATOS. No contacts were made until after departure from assigned area, enroute south to FUKAMITI.

Attack No. 1 - A large convoy was contacted west of JUZON while on the surface in the early morning of 9 October 1944. An end around was made and a day periscope attack conducted on a large freighter and a tanker, from a range of 2400 yards, 87° track, small gyro angle, 10 foot depth setting. Three Mark 18 torpedoes were fired at the freighter, one at the tanker. The spread used on the freighter ensured coverage of 480 feet. No hits were obtained on either ship. Cause of the misses may be attributed to faulty operation of the T.O.C. An attempt to regain contact with this convoy was unsuccessful.

On 23 September CAVALIA was machine gunned by a plane which got in unentered. The ST was being keyed every minute. Continuous use of the ST in areas of heavy air coverage is considered most advisable even though the ST is susceptible to detection. The turn to the right on diving may indeed have been the reason for no further action by the plane. It is also noted that the radar detector, not the ST radar, was used to avoid radar-equipped planes in the JUZON STRATOS area.

The CAVALIA returned in good material condition. The T.O.C. will be thoroughly checked, mufflers renewed and all other material defects corrected during the refit by SURV.US and ONI EIGHTY-ONE (1) Relief Crew. The status of cleanliness upon return to port was always average.

— page 126 —
15-18/A16-3
Serial 0203
CONFIDENTIAL

FIRST RECEIPT TO:
U.S.S. CAVALIA (SS244) -
Report of Second War Patrol

Subject: U.S.S. CAVALIA (SS244) - Report of War Patrol
Number Two.

Despite the lack of targets and the fact that no damage was inflicted on the enemy the morale of officers and crew was high. Certainly the lack of success was not from lack of trying and the Squadron Commander joins the officers and crew in hoping for better luck next time.

SLICHT H. BRYANT.

— page 127 —
12 07/59

Subject: U.S.S. CAVAILA (SS244) - Report of Second War Patrol - Combat not.

1. CAVAILA's Second War Patrol was conducted North of [PLAIN TEXT HERE] and in the vicinity of [PLAIN TEXT HERE] as a member of a [PLAIN TEXT HERE] Jointly Enlisted Search and Attack Group directed by Commander R. S. [PLAIN TEXT HERE], U.S.N.

2. Enroute FROM THE CAVAILA made the only contact of the patrol on a large convoy west of [PLAIN TEXT HERE]. A daylit end run was followed by a perilous attack which was unsuccessful due to the after angle solver functioning improperly and to a course change by the target two minutes after firing.

3. It is noted that difficulty was experienced in opening the outer doors of the forward tube nest due to the hydraulic control valves being stuck in the closed position. The method used by CAVAILA to prevent a recurrence is recommended for adoption by all Commanding Officers.

4. The present policy in this Force concerning the use of the SD Radar is prescribed in paragraph eight of Annex "B" to Commander Task Group 71.1 Operation Plan No. 1-44, and in Annex "B" of each Operation Order.

5. The award of the Submarine Combat Insignia is not authorized for this patrol.

6. The Force Commander welcomes CAVAILA's Commanding Officer, Officers and Crew with the assurance that future patrols will provide opportunities for attack.

7. No damage was inflicted on the enemy.

R. W. CHRISTIE.

— page 128 —
12A/7r
Serial 01343
11 November 1944

SECOND ENDORSEMENT to:
USS CAVALIA Conf. Ltr.
dated 21 October, 1944.
Report of Second War Patrol.

Subject: U.S.S. CAVALIA (SS244) - Report of Second War Patrol - Comment on.

---

**DISCRIPTION:**

| Code | Text |
|------|------|
| 1    | Cominoch |
| 2    | Vico Opnav |
| 3    | Vico Opnav Op-230 |
| 4    | ComlstFit |
| 5    | Com2ndFit |
| 6    | Com7thFit |
| 7    | ComsublstFit |
| 8    | Comsub2ndFit |
| 9    | CDF-71 |
| 10   | CDF-72 |

| Code | Text |
|------|------|
| 1    | - Direct |
| 2    | - Direct |
| 3    | - DivonsubRom-12 |
| 4    | - DivonsubRom-16 |
| 5    | - DivonsubRom-18 |
| 6    | - S/M Sonool, N.L. Conn. |
| 7    | - Subad, Mare Island. |
| 8    | - S/Ms 7TH FLT. |

THIS REPORT WILL BE DISROYED PRIOR TO ENTRY INTO ENEMY OWNBORNE WATERS.

P. F. STRAUB, Jr.,
Flag Secretary.

— page 129 —
12 07:43
USS CAVALLA Conf. Ltr.
dated 21 October 1944.

From: Commander Seventh Fleet.
To: Commander in Chief, United States.Fleet.
Subject: U.S.S. CAVALLA (SS244) - Report of Second War Patrol.

1. Forwarded.

Signature: J. H. LONDON
By direction.

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

— page 132 —
13) SD radar units in control room re-located between periscope wells.

(14) Received sound test and ran the magnetic range.

(15) Ship painted light gray.

Underway for training exercises 7 to 11 November. Radar and sea approaches were made, and three Mk. 29 exerci3s torpedoes were fired. The 4 inch gun was fired at a 'toward target. All other guns were fired first. Loading was accomplished 12 - 13 November.

Lieutenant James B. Casier, U.S.N., and Ensign Ramon B. Nichols, U.S.N., were detached and ordered to Surimiri Division 182 for duty. Ensign Edward J. Koehne, Jr., U.S.N., reported aboard for duty. Readiness for sea 14 November 1944.

(B) NARRATIVE

Following is the list of officers and chief petty officers attached to this vessel, with total number of patrols made, including the third patrol of this vessel just commencing:

| Name          | Rate | No. Patrols |
||------||
| Kossler, Herman J. | Commander, U.S.N. | 7 |
| Doneger, Thomas B., Jr. | Lieutenant, U.S.N.R. | 9 |
| Eberle, Edward R. | Lieutenant, U.S.N.R. | 3 |
| Rand, Arthur G., Jr. | Lieutenant, U.S.N. | 3 |
| Eeds, Edward L. | Lieutenant (j.g.), U.S.N.R. | 2 |
| Page, Edward C., Jr. | Lieutenant (j.g.), U.S.N.R. | 3 |
| Zellmer, Ernest J. | Lieutenant (j.g.), U.S.N.R. | 3 |
| Cathey, Vance L. | Ensign, U.S.N.R. | 3 |
| Koehne, Edward J., Jr. | Ensign, U.S.N. | 10 |
| Ryan, Lloyd E. | CPM (AA) | 3 |
| LOVETT, James L. | CPM (AA) (T) | 4 |
| WERT, Woodrow W. | CPM (AA) (T) | 6 |
| MALCO, Marion I. | CPM (AA) | 3 |
| VERKERK, Otto W. | CPM (AA) | 8 |
| ARISTRONG, Kenneth G. | CPM (AA) | 9 |
| HOLT, Ray B. | CPM (AA) | 5 |
| CHANDLER, Raymond L. | CPM (AA) (T) | 3 |

— page 133 —
14 November 1944

1300(H) Underway from nest alongside U.S.S. BURVILLE, Fremantle, Australia, and stood out channel in accordance with orders. 15th hour. 1450(H) Fired four rounds from 4 inch gun at target toward by HMS Bistropa.

1511(H) Proposed in company with U.S.S. BAYL to position for survey exercise with target group.

1625(H) Attended and around on target group. However, a very anxious time operating with the target group was in no way different than training in completing a cylinder on an around, my officers of the dock received a lot of training in diving for planes.

1923(H) Stationed radar tracking party, and commenced and around the starboard flank of target group.

1945(H) Davis, Arthur G., Slo(EM), 1725 81 54, U.S.N.R., developed an attack of acute appendicitis. Obtained permission from 376 to transfer patient to Naval air return to Fremantle, so began closing target group.

2113(H) Transfer completed. Opened out, and commenced end around.

2248(H) End around completed. Assimilated attack with four torpedoes, 60 starboard track, range 3000 yards.

2253(H) Exercises completed, took course and speed ordered by Bay. The Baya was not contacted during remainder of night.

15 November 1944

1051(H) Sighted Daya ahead, distant 7 miles, and joined up astern.

1217(H) Plane contact #1. Sighted, distant 15 miles. Plane answered IF and departed.

— page 134 —
1732 (H) Plane contact #2. Sighted and contacted by radar, distant 11 miles. Identified as PBY, and disappeared from sight in ten minutes.

1853 (H) Baya reported her port chart had developed a low howl, and she was returning to Fremantle. We proceeded independently.

16 November 1944.

1013 (H) Plane contact #3. Contacted by radar, distant 10 miles. Contact moved in to 13 miles, answered INA distress, then moved out to 22 miles and disappeared from screen.

17 November 1944.

0001 (H) Sighted loom of Vlaming Head light ten degrees on starboard bow.

0348 (H) Passed Vlaming Head light abeam to starboard distant 5 miles. Commenced steering various courses to occur on Exmouth Gulf entrance and channel.

0732 (H) Moored port side to starboard side U.S.S. Y-10, Exmouth Gulf, Australia. The following was accomplished during our stay here:
   (1) Received 19,200 gallons fuel oil and 900 gallons water.

   (2) Instructed various members of crew in use of small arms.

   (3) Held swimming call. Also provided all hands with one bottle of beer (Aussie size).

   (4) Transferred Cleplenski, Rudolph J., EMC(T), #238 76 17, U.S.N., to Sub Div 181 for observation and possible treatment for syphilis.

1710 (H) Underway, proceeding out Exmouth Gulf.

2004 (H) Passed Vlaming Head light, abeam to port, distant 5 miles.

18 November 1944.

Conducted training dives during day, exercised

— page 135 —
1115 (H)  Locomotives reported periscope bearing 350
    relative distance 750 yards. Changed course and
    increased speed to avoid. No one else sighted
    this contact.

19 November 1944

1036 (H)  Plan contact with enemy. Contacted by radar, distant
    fire. Made answerable challenge properly.
    It closed to 12 miles, and then opened out to
    22 miles where it disappeared from screen at
    1050 h.m.

20 November 1944

0521 (H)  Summarged south of Lornack Strait in order to
    make approach undetected.

1835 (H)  Surface. Will reach entrance to Strait after
    moon has set, and with battery fully charged.

21 November 1944

0000 (H)  Radar detector encountered sweeping interference
    or 17% negative. There appeared to be two
    land based directional radars which steadied
    on us as we neared the Strait.

0034 (H)  Entered Strait, steering courses to conform
    to the middle, at full speed on 4 engines.

0046 (H)  Sighted several blinking lights on Nusa Besar
    Island.

0058 (H)  Interference on SJ bearing approximately ahead.
    Attentive to exchange recognition signals, but
    was not successful.

0104 (H)  Ship contact #1. Radar contact dead ahead,
    distant 5000 yards, closing rapidly, Put rudder
    hard right, and then watched what was believed
    to be the Bluegill pass our stern, at a range of
    a little less than 2000 yards. All we could see
    was wake and flying spray. Apparently, Bluegill
    had not contacted us.

— page 136 —
0106 (H) Ship contact #2. Radar contacted small vessel on starboard bow, range 1500 yards, which could not be identified from bridge. Possibly a patrol boat, as radar could not be seen. Commented 'swinging slowly to port to avoid, and at some time, keep clear of Bluegill.

: 0111 (H) Situation back to normal. Once more heading thrown clear at 20 degrees.

: 0235 (H) Ship contact #1. Sighted and picked up by radar, on starboard bow, distant 4600 yards. Looked like small patrol, and until we finally lost her, he tracked at 12 knots, heading in our direction.

: 0535 (H) Ship contact #4. Sighted and avoided sailboat on starboard beam, distant about 5 miles.

: 0607 (H) Ship contact #5. Sighted and avoided sailboat dead ahead, distant about 8 miles.

: 0904 (H) Ship contact #6. Sighted two sailboats five degrees on starboard bow, distant about 8 miles. Avoided.

: 0954 (H) Plane contact #5. Radar contact, distant 30 miles. Contact moved in to 20 miles, answered IFF call/signature, than opened out to 30 miles and disappeared from screen at 1000 (H).

: 1114 (H) Plane contact #7. Radar contact, distant 27 miles. It slowly moved in to 26 miles, did not answer IFF challenge, then opened out to 31 miles and disappeared from screen at 1131 (H).

: 1252 (H) Plane contact #7. Radar contact, distant 18 miles. Did not answer IFF challenge, slowly moved out to 20 miles and disappeared from screen at 1255 (H).

: 1446 (H) Plane contact #8. Radar contact, distant 12 miles, which closed rapidly to 10 miles.

: 1448 (H) Submerged to avoid detection.

: 1641 (H) Surfaced.

— page 137 —
1829 (H) Ship contact #7. Sighted sailboat thirty
    Garrisons on the starboard bow, distant about
    8 miles. Arcsident.

: 1940 (H) Ship contact #8. Sighted small unidentified
    boat on starboard on starboard bow, distant
    about 3000 yards. Arcsident. Ssored and avoided.

: 2310 (H) Ship contact #9. Sighted heavy smoke, closed
    to starboard. By sounding radar on, picked
    up contact about 11,000 yards.

: 2334 (H) Stationed radar tracking party. Meselambo was
    bearing 016° T, distant 14 miles.

: 2340 (H) Target tracked on course 0460 T, speed about 9
    knots, heading for Masalambo Island. I began
    to get a little suspicious, because he was
    still smoking very heavily and steering a
    straight course.

: 2350 (H) While closing track, sighted a large low lying
    raft made of heavy wool cloth ahead, distant
    about 100 yards, full left rudder swiched the
    raft by inches. I could see no one inside as
    we passed it.

: 2359 (H) Manned battle stations and headed in for attack.

22 November 1944

0000 (H) Ship contact #10. With target at range of
    about 7000 yards, angle on bow 60 degrees port,
    sighted small low lying boat 30 degrees on the
    starboard bow, range 3000 yards, closing fast.
    Two whole set-up now had the appearance of a
    "smokey-roof", hunter killer group, with the
    target, which now locked to be a patrol boat,
    as the bait. To we swung left with full rudder,
    and placed target and small boat astern. The
    range to the small boat decreased to 1500 yards
    during the turn.

0018 (H) Now well clear of contacts. The large patrol
    boat was signalling to someone, but we could
    not tell to whom.

— page 138 —
0516 (H) Ship Contact #11. Radar contact on small unidentified vessel, forty degrees on starboard bow, range 5 miles. Changed course to aviso.

: 0559 (H) Masts of small vessel still in sight from bridge. Appeared to be a patrol boat. Bawen Island in sight distant 25 miles. Inasmuch as we can't make Koriata Strait tonight, decided to dive at this time to keep from being spotted. The water here isn't too deep either.

: 1711 (H) Surfaced.

: 1728 (H) Ship contact #12. Sighted two sailboats ten degrees on the port bow, range about ten miles. One looked large, so looked towards them to investigate.

: 1804 (H) Manned 40 M/2, 25 M/2 and 50 caliber guns. As we neared, the heavy developed into a topsail schooner towing a smaller 3-cop rigged boat, both vessels under our control.

: 1836 (H) Passed 200 yards ahead of boats. They were manned by natives who made no attempt to hide or evade us. Both boats have to cut dropped their sails as we passed by. The boats looked clean and well kept, and carried no insignia of any type. The only suspicious feature was that our radio department reported hearing nearby signals on the 500 K/2 emergency frequency band. However, we saw no radio antenna and did not open fire.

: 1847 (H) Steadied on southerly course until darkness so as not to divulge our true course.

23 November 1944

: 0250 (H) Ship contact #13. Seilboat bearing 40 degrees relative, distant 4600 yards. Avoided.

: 0636 (H) Submerged to conduct undetected approach to Kerimata Strait.

: 1803 (H) Surfaced.

— page 139 —
2030 (II) Entered Karimata Strait.
: 2035 (H) Ship contact #14. Sighted and picked up by radar at 11:00. Disabled boat, bearing 340 degrees relative, distant 5 miles. Avoided.
: 24 November 1944
: 0442 (E) Passed Serutu list ashore to starboard, 0150 T, distant 10 miles.
: 0549 (H) Ship contact #15. Sighted and picked up by radar at 11:00. Disabled boat, bearing 310 degrees relative, distant 670 yards. Avoided.
: 0903 (H) Plane contact #13. Radar contact, distant 18 miles. Closed to 15 miles, then moved back out to 22 miles, where it disappeared from screen at 0906 (H).
: 1242 (H) Plane contact #10. Radar contact, distant 22 miles. Floated up by periscope, and then by bridge watch, activation 7°. It was apparently bridge and radar maintained contact until plane disappeared at 1300 (H), range 34 miles.
: 1403 (H) Ship contact #16. Sighted bearing 349 degrees relative, distant 8 miles. Avoided.
: 1543 (H) Sighted St. Farbe Island Bearing 0120 T, distant 40 miles.
: 1814 (H) Sighted Bacca Tal and group bearing 0110 T, distant 39 Mils.
: 2010 (H) Set course 027° T to pass west of the Tambelan Islands.
: 2053 (H) Ship contact #17. Sighted bearing 70 degrees relative, distant 3 miles. Avoided.
: 2305 (H) Took departure from Tambelan Islands, Mendarik aboard to port distant 7 miles.

25 November 1944
: 0219 (H) Ship contact #18. Radar contact bearing 3020 T, distant 14,000 yards.

— page 140 —
0226 (H) Manned stations for radar tracking, with contact astern. Contact was two ships, one about 1000 yards further away than other.

: 0238 (H) Target tracking on course 07C degress true, speed fitter knots, angle on bow 70 starboard. Went 50 for engine speed and command on around, starting at range of about 14,000 yards. The more distant target appeared to be the smaller of the two, so Goidel did not track closer on. There would be a sea from bridge as blur on horizon.

: 0319 (H) Manned battle stations.

: 0328 (H) Angle on bow now 30 sternboard, range 13,150 yards. Target steering steady course, 070 speed 15, tracking very nicely. Came last with full rudder and headed in for attack, showing zero silhouette, and slowed to ten knots to cut down bow wave. Might was dark and clear with satisfactory results.

: 0340 (H) Target identified as Cruiser at 6000 yards. The question now, what to do? If I turn to head back out for another end around and submerged attack he will probably sight me. If I dive now in position. The radar detector had picked up no indication of radar. Decided to head on in on the surface, continuing to give zero silhouette until time of firing. Second contact was 1000 yards on port left of target.

: 0346 (H) Attack No. 1. With range 2700 yards, quickly swung right for a 100 starboard track, zero gyro angle, and commenced firing tubes 3, 4, 5, and 6, divergent spread, 2 second firing interval. The second target was bluelock by the first so could not fire at it also. Went to flank speed and commenced swinging left with full rudder just after #6 torpedo left the tube.

: 0348 (H) About one minute forty seconds after firing, the first torpedo hit amidships. Eight seconds later the second hit just aft of amidships, the third hit on the bow, and the fourth hit on the stern, all hits about 8 seconds apart. The first two

— page 141 —
0353 (T)
...It out we had stood out like a sora thumb while the tr act ran burril, the second tr ret, makin lacon like a lit out rider, evidently didn't see us. But I don't think we were prepared for this. We

— page 142 —
26 November 1944
0200 (H) Cleared channel and set course for assigned area.
1300 (H) Passed close aboard an unsecured parachute, with no aviator attached to it.
27 November 1944
1602 (H) Entered assigned patrol station.
1843 (H) Sent my first despatch to Commander Task Force Sever.
28 November 1944
0628 (H) Submerged.
1825 (H) Surfaced.
29 November 1944
0632 (H) Submerged. Went deep and found 9 degree negative gradient between 150 and 300 feet.
1824 (H) Surfaced.
30 November 1944
0630 (H) Submerged. Found same negative gradient as yesterday.
1820 (H) Surfaced.
1 December 1944
0101 (H) Ship contact #20. Sighted ship about 30° on port bow. Turned to put contact astern. Bright moon, visibility excellent. Coached radar on target, but it was unable to pick it up, so at
0112 (H) Reversed course and headed for target at slow speed.

- 12 -

— page 143 —
0136 (H) Target appeared to be very close, but still could not be picked up by radar. This true bearing changed very slowly to right. Hull of target could see, and it looked like either a small fishing boat or patrol boat, or else a small submarine. Reverse course an. put contact astern to consider the situation. No radar interference on SJ, and no. nocking picked up by detector.

: 0151 (H) Charged course to head back in for target again, 5000

: 0209 (H) Target definitely small and close. Radar (H) 8100 finally made contact, range 2500 yards. Swing left at high speed and got out of range. Desired to leave it alone, because I wasn't too sure what type vessel it was. (H) 1512

: 1524 (H) Possible periscope sighted by officer of the deck, about 80 degrees on starboard bow, range 1500 yards. Put it astern and cleared area at high speed.

: 1838 (H) Interference picked up on SJ radar, bearing about 0100 T. Our position, 11-15 N, 111-57 E. - Appeared to be another SC. Several attempts were made to exchange recognition signals, but no luck.

: 2213 (H) Ship contact #21. Picked up by radar and sighted from bridge, bearing 1830 T, range 23,000 yards. Contact closing fast, so went to four engines and put it astern.

: 2246 (H) Target on base course 0250 T, zigging every three to ten minutes to course 3550 T, 0250 T, 0550 T, at speed 18 knots. Visibility is so good I'm tracking it a range of 10,000 yards. An aircraft is I let him get closer he will see my exhaust or wake. No other contacts. Nothing picked up by radar detector. Our only chance is to go on his base track, and dive for radar and periscope approach.

: 2347 (H) We were on base track of target. He was bearing 2040 T, range 17,000 yards. We also have the courses of his zig plan, but the times were erratic. He was making 18 knots,

— page 144 —
U.S.S. CAVALIA - Report of Third War Patrol.

base course 025° T, zigging 300 right and left about every 7 minutes. Still no escorts have been picked up. The target looks big as a house from the bridge. Submerged to radar depth and headed in on true bearing of target, just after he zigged to 025° T. If he keeps to his zig plan, we'll get him on course 3550 T.

2 December 1944

0002 (H)
SJ radar contacted target bearing 207° T, distant 12,000 yards. Echo ranging could be heard on 24 Kcs. One escort could be seen through periscope on sterboard flank, turn count 100 RPM, and it looked like a destroyer. Sound also reported two escorts or port flank, which was the dark side, but they were never sighted through periscope.

0008 (H)
Target bearing 2010 T, distant 7800 yards. Sterboard escort bearing 1980 T, distant 5400 yards. Target tracking on course 025° T, speed 18 knots, and was just about due for zig left to 3550 T. Went to periscope depth. Plan of attack was to continue on present course and then swing hard right for 110 to 124 sterboard track bow tubes.

0111 (H)
Target zigged left to course 3550 T, angle on bow about 20 sterboard. Soreen also made zig to left, but instead of having a port angle on bow as I expected, it was about 10 sterboard. Swung left to put escort about 10 degrees on sterboard bow, hoping he would pass me a couple hundred yards to sterboard, and then I could swing hard right around his stern and make periscope attack with bow tubes. Target was identified at this time as a battleship, class uncortain, possibly Yamato.

0118 (H)
Escort slowed, stopped pinging, swung right and gave me a zero angle on the bow. He either has us, or is suspicious. This maneuver at his completely ruined my plan of attack. Took quick set-up on target, which was tracking nicely on 3550 T, went to 90 feet, and commenced swing left for zero gyro shot, stern tubes.

— page 145 —
0020 (H) Escort passed overhead, between after engine room and torpedo room. Steadied on course for 120 earbroker track. Sound bearings checked in 1000.

: 0021 (H) Attack #2. Commenced firing stern tubes, gyro units 7 to 11 degrees right, torpedo run 2800 yards, depth not at 6 and 10 feet, divergent spread, 90 percent coverage.

: 0023 (H) Went to deep submergence. None of the torpedoes were heard to hit.

: 0031 (H) Commenced coming up to periscope depth. At approximately 150 feet heard and felt one depth charge, not very close. Based back down to 300 feet.

: 0041 (H) Commenced coming up to periscope depth. At 80 feet we heard a heavy rattling from outside, and a loud scraping sound was heard throughout the ship, as if a wire cable was being dragged to 100 feet. Source of the scraping sound was not clear.

: 0048 (H) Commenced coming to periscope depth.

: 0102 (H) Periscope depth, all clear. Completed reload of after tubes, and obtained trim.

: 0119 (H) Surface. Sound in sight bearing 090° T, range about 6 miles. He must have been left behind to march for us, because within a couple minutes after we surfaced he disappeared. Contact report was sent immediately, and reception for in a few minutes by H.M.A. Also sent contact out to radio on area frequency. Headed in direction of last contact, but had no hopes of regaining it.

: 1040 (H) Plane contact 111. Contacted by radar between 20 and 30 miles, and appeared to be a flight of several planes. Served answers received on IFF. My be friendly please looking for brittelship.

: 1127 (H) Passed unused parachute, 11-29 N, 112-48 E.

— page 146 —
3 December 1944

0600 (H)
to
0633 (H)
1552 (H)
0205 (H)
1756 (H)
1135 (H)
1140 (H)
6 December 1944

Patrolling in assigned area.
Plane contact #12. Radar contact, distant 24 miles. Closed to 22 miles before finally disappearing from screen. Did not answer IFF.

Patrolling on East end West courses in assigned area. The worse part of the storm has now passed over.

— page 147 —
1725 (H) Recovered large Japanese life ring, lat 11-37 N, long 110-55 E.

7 December 1944

1002 (H) Sighted and investigated overturned lifeboat, floating very low in water with only keel showing. Position 11-45 N, 111-27 E.

8 December 1944

Today has a lot of "3"s" attached to it. The war is "3" years old, this is war patrol number "3", we are searching for number "3" contest of this patrol, and today is Commanding Officer's birthday and he is "3".

0215 (H) Received despatch from Wolf Pack Commander assigning new patrol station commencing at darkness tonight.

0650 (H) Submerged for trita dive. Went deep and found nine degree negative gradient between 180 and 300 feet.

0745 (H) Surfaced.

0800 (H) Ship contact #22. Sighted Destroyer through high periscope bearing 1450 M, range about 10 miles, 11-32 N, 111-56 E. Angle on the bow was about 120 degrees, course about 0600 T, and appeared to be making high speed. Continued chasing at high speed, but target disappeared from sight in about 15 minutes in rain scuff.

0855 (H) Received message from Baya reporting 20 to 25 knot Destroyer sighted at 0700 (H), course 050. Plot showed this to be same Destroyer sighted by us.

1007 (H) Sent message to Wolf Pack Commander telling him we were in "mess pursuit" along track of contact. Possibility contact might be making rendezvous with a convoy.

1707 (H) Nothing further sighted. Altered course to head for assigned area.

— page 148 —
2025 (H) SJ radar picked up interference from another SJ which lasted about 15 minutes. No luck in attempt to challenge. Position 12-01 N, 112-45 E.

9 December 1944

1135 (H) Received contact report from Baya, two destroyers, heading North. Not close enough to do us any good.

1624 (H) Picked up interference on radar detector, believed to be 'nausea' by a "D" radar.

1654 (H) Sighted Baya through high periscope. Joined up with Baya and exchanged information for about half hour.

2057 (H) Received new area assignment from Commander Task Force Seventy-One.

10 December 1944

0858 (H) Overcast skies, heavy seas, and intermittent heavy rain squalls last couple days.

1352 (H) Hoa reported diving to attack Hoa target from port flank. Attempted two engine speed to get to scene quicker. However, we pounded so heavily into the sea that solid water came over bridge continuously. Slowed to 6 knots.

1447 (H) Baya reported contact was hospital ship.

2112 (H) Inasmuch as we had not had a fix in about three days, sent message to Baya at this time telling them we would not enter Dangerous Ground until weather cleared and we obtained a fix. Also told Baya in what vicinity we would patrol while waiting to get fix.

2220 (H) Intercepted message from Baya to CTF 71 stating she would not enter Dangerous Ground until she was able to fix position. No mention was made of us, so if weather doesn't clear by tomorrow night, I'll have to sound off.

— page 149 —
11 December 1944
Weather: same as before.
Sent my serial #2 to Commander Task Force
Seventy-Ordn. reporting delay in reaching new
Patrol station.

12 December 1944
Skies began to clear a little this morning, and
by evening the storm had completely passed.
Ground-to-mooring, after morning fix, was
obtained.

13 December 1944
Outboard exhaust valve on #3 main engine stuck
open while attempting to make trim dive. Surfaced
immediately and read up valve.
Surfaced.

0715 (H)
Surfaced.

0755 (H)
Surfaced.

1200 (H)
Entered Dangerous Ground, and commenced patrolling
designated area.

14 December 1944
Sighted floating mine, distant about two miles
ahead, 5-22 N, 113-24 E. Closed to about 150
yards to investigate, and found that it was
apparently a second type mine depth charge. There were
two concentric rings of smoke or horns showing,
also a small cylinder shaped projection on the
top of the mine. Headed toward the surface
indicated it had been very sea growth and corrosion
time. We broke out the small ammo, steamed
around the mine at about 150 yard range firing,
and finally sank it. Mine did not explode.

2200 (H)
Sent message #3, reporting encounter with mine.

15 December 1944
Received craders to new patrol station, Decided to
wait until after morning fix before attempting to
pass through shoals ordering Dangerous Ground.

- 19 -

— page 150 —
U.S.S. CAVALLA - Report of Third War Patrol.

0806 (H) Cleared Dangerous Ground and went to two engine speed. Due to low fuel, my speed is limited for remainder patrol.

2050 (H) Received new craders from Commander Task Force Seventy-Ons concurring patrol station.

16 December 1944

0702 (H) Submerged, conducting trim and deep dive. Found a 60 negative gradient between 200 and 300 feet.

0801 (H) Surfaced.

1012 (H) Received message Hammerschroeder diving for plane.

1820 (H) Encountered interference on the SJ radar. Exchanged recognition signals and then calls with the U.S.S. Raya.

1850 (H) Entered assigned patrol station.

1900 (H) Entered assigned patrol station.

17 December 1944:

Sky overcast, sea increasing.

1020 (H) Received message Hammerschroeder diving for plane.

18 December 1944:

Sky clearing, sea still heavy.

0344 (H) Encountered weak interference on the SJ radar, but was not successful in exchanging recognition signals. Position, 11-40 N, 117-46 E.

1235 (H) Plane contact #13. Picked up by radar, range 15 miles, closing rapidly. No reply to IFF.

1237 (H) Range 11 miles, not seen from bridge. Submerged.

1353 (H) Surfaced.

19 December 1944:

Seas still heavy.

0933 (H) Plane contact #14. Two planes picked up by radar, range 14 and 16 miles, closing rapidly.

— page 151 —
0935 (H) Range 10 miles to closest plane, not sighted from bridge, submerged.
: 1042 (H) Surflaced.
: 1928 (H) Received orders to proceed new petrol station and operates in rack under Captain Bryant in Newkolli. Set course for new station.

20 December 1944

Seas still heavy, sky partially overcast.
: 0605 (H) Sighted and exchanged cells with the U.S.S. COBIA.
: 0625 (H) Received patrol instructions by voice from Paok Commander.
: 1145 (H) Plane contact #15. Picked up by radar, range 12 miles, closing. At 11 miles received answer to IFF challenge.
: 1147 (H) Submerged. Range 10 miles, still closing. Not sighted from bridge.
: 1257 (H) Surflaced.
: 1444 (H) Received typhoon warning from Commander Task Force Seventy-One. Seas end wind were picking up, and it began to look like one.

21 December 1944

Very heavy seas and wind all day until late in afternoon, when seas began to decrease.
: 0245 (H) Exchanged recognition signals and calls with Bay by SJ.

22 December 1944

Seas moderate, sky almost clear.
: 0637 (H) Plane contact #16. Picked up by radar, range 18 miles. Not sighted from bridge. Plane answered IFF challenge, slowly moved out, and disappeared from screen at 22 miles.
: 0642 (H) Plane contact #17. Picked up by SD radar, range 11 miles. Plane answered IFF.

1941 (H) Plane contact #17. Picked up by SD radar, range 11 miles. Plane answered IFF.

— page 152 —
1943 (H) With range 6 miles, SD lost contact.
: 1944 (H) SJ radar made contact on plane, bearing 270 relative; range 3 miles. Submerged.
: 2028 (H) Suriaced.
: 2030 (H) Received orders from Pack Commander to rendezvous at 0630 tomorrow morning.

23 December 1944

0100 (H) Exchanged recognition signals and calls with Bay.
0614 (H) Sighted and exchanged visual calls with Bay.
0625 (H) Sighted and exchanged calls with Hawkbill, who reported she had plane in sight. Not sighted by us or picked up by radar. Lost by Hawkbill about five minutes after this.
0636 (H) to 0644 (H) Plane contact #18. Sighted and picked up by radar, range 22 miles. Disappeared from screen and sight at 27 miles.
0715 (H) After giving instructions to Bay, Hawkbill closed us and gave patrol instructions. Had a good contact on SD at this time which closed from 7 to 4 miles and then was lost. Nothing sighted from bridge. Must have been a "bogey".
0734 (H) Set course for assigned patrol station.
1230 (H) Plane contact #19. Sighted and picked up by radar, range 12 miles, closing. No answer to IFF or VHF.
1233 (H) Submerged. Range to plane 9 miles.
1347 (H) Surfaced.
1432 (H) Plane contact #20. Picked up by radar, range 18 miles. Not sighted from bridge. Range varied between 17 and 22 miles. No response received to IFF or VHF. Plane disappeared from screen finally at 21 miles.

- 22 -

— page 153 —
2156 (H) Plane contact #21. Picked up by radar, range 7 miles. No response to IFF.
: 2157 (H) Submerged. Range to plane 6 miles.
: 2237 (H) Surfaced.
: 24 December 1944

0808 (H) Plane contact #22. Picked up by radar, range 19 miles. Not sighted from bridge. No answer to IFF or VHF. Disappeared from screen at 21 miles.
: 1052 (H) Plane contact #23. Picked up by radar, range 21 miles. Not sighted from bridge. No answer to IFF. Disappeared from screen at 22 miles.
: 1318 (H) Plane contact #24. Picked up by radar, range 22 miles. Not sighted from bridge. No answer to IFF. Disappeared from screen at 22 miles.
: 1327 (H) Received message saying our orders to leave station would be sent later. Our operation order calls for us to leave tomorrow night. Beginning to be pinched for fuel.
: 2135 (H) Plane contact #25. Picked up by radar, range 12 miles, and disappeared from screen at same range. No answer to IFF.
: 2138 (H) No answer to IFF.

25 December 1944

0927 (H) Plane contact #26. Radar contact, 14 miles, not sighted from bridge. No IFF answer.
: 0931 (H) Submerged. Range to plane 8 miles.
: 1102 (H) Surfaced.
: 1105 (H) Sent message to Hawkbill and Baya reporting large number plane contacts last couple days, the fact that my fuel was got low, and requested patrol station be shifted westward. Baya, but not Hawkbill received for message. Tried every half hour after this to contact Hawkbill.
: 1236 (H) Plane contact #27. Sighted plane on port quarter, elevation about 20, range 14 miles, crossing from port to starboard. Not picked up by radar. This was a large land based bomber type Betty.

— page 154 —
1237 (H) When directly astern, plane turned left and headed directly for us.
: 1238 (H) Submerged.
: 1352 (H) Surfaced.
: 1355 (H) Received message from Hawkbill that she was departing for an east. We then sent our message, and received an affirmative beck from them.
: 1427 (H) Plane contact #21. Picked up by radar, range 11 miles, closing fast. Not sighted from bridge.
: 1428 (H) Submerged.
: 1556 (H) Surfaced. Told Hawkbill and Baya we were heading West, and gave position we were heading for. No receipt from Baya.
: 1815 (H) Received message from Baya assigning new patrol station to westward.
: 1904 (H) Interference on SJ radar caused by another SJ. Exchanged recognition signals with another submarine, believed to be Hawkbill.
: 1931 (H) And thus Cavalla spent Christmas Day 1944.
: 2359 (H) And thus Cavalla spent Christmas Day 1944.
: 26 December 1944
: 0224 (H) Plane contact #29. Picked up by radar, range 12 miles, no response to IFF. Plane closed to 8 miles, and then opened out to 14 miles, where it disappeared from screen.
: 1400 (H) Plane contact #30. Picked up by radar, range 8 miles, closing fast. Not sighted from bridge.
: 1528 (H) Surfaced.
: 2238 (H) Received message from Baya to shift patrol station 60 miles south.
: 27 December 1944
: 0844 (H) Plane contact #31. Picked up by radar, range 8 miles. Closing fast. Not sighted from bridge.

- 24 -

— page 155 —
0845 (H) Submerged.
1031 (H) Surfaced.
1235 (H) Plane contact #32. Picked up by radar, range 13 miles. Not engaged from screen to 15 miles. No response to 17 or VFR.
1239 (H) Received contact report from Bay. 12-43 N, 11-24 P, course 220, speed 17. This was 30 miles north of us. Immediately went to our engine speed to course 300. Sea from the north made it rough riding, we cut down our speed through the water.

2010 (H) Received second report from Paya. She reported there were at least 5 ships, and returned course and speed to 31-45 N. This course change occurred on our own contact. However they may either change course or scatter in way when Dayi attacks.

2125 (H) Changed course to 315.

2158 (H) #4 engine cut off commission. Continued chase on 3 engines. (See desingments).

2200 (H) Tried unsuccessfully every half hour to contact Baya to get enemy position, course and speed.

2400 (H) #4 engine back in commission. Continued chase on 4 engines.

2301 (H) Received new patrol station assignment of Mindoro from Commander Task Force Seventy One.

2344 (H) Plane contact #32. Picked up by radar, range 12 miles. Closed to 11 miles, and then opened out and disappeared from screen at 13 miles. No response to VFR.

2347 (H)

28 December 1944.

0001 (H) Plane contact #34. Picked up by radar, range 5 miles, closing fast. Submerged.

— page 156 —
0017 (H)
Several sharp light explosions in rapid succession were heard throughout the ship. It is believed that this was caused by the plane strafing water with machine gun fire. We were at 90 feet at the time. Immediately came to periscope depth but nothing was in sight.

: 0100 (H)
Surfaced. Gave up chase and set course for new petrol station. By pilot we were about 40 miles from contact. No word has been received from Baya since 2010 (H).

: 0144 (H)
Baya reported she had attacked a group of 5 ships at 2203 (H). A second message from Baya about 5 minutes later elicited it's had made contact.

: 0232 (H)
Notified Baya we had not made contact, and were now proceeding to now area.

: 0817 (H)
Plane contact #35. Two planes picked up by radar, range 17 miles. Not sighted from bridge. Disappeared from screen at 21 miles No response to IFF.

: 0820 (H)
Received message containing petrol instructions from OTC of scouting line.

: 2312 (H)
Commenced patrolling on new station.

: 0700 (H)
Plane contact #36. Sighted on port beam, range about 10 miles, elevation 10, type Betty, heading towards us. Not picked up by radar.

: 1547 (H)
Submerged.

: 1548 (H)
Surfaced.

: 1754 (H)
Received orders and routing instructions for returning Freemantle tomorrow night. We have 33,000 gallons fuel.

— page 157 —
20 December 1944

Last day on patrol line, nothing sighted. Departed area at dark for [REMOTE: distance to Palawan Passage, Sent message to Caiman that we were leaving, but received no receipt].

21 December 1944

Enroute through Palawan Passage on the surface. (H) Palawan Island in sight all day.

1005 (H) Plane contact #17. 21st dark up by radar, range 14 miles. Not sighted from bridge. No response to IFF. Disappeared from screen at 15 miles.

1214 (H) Plane contact #28. Sighted dead dead dead, range about 10 miles, passing fire started to not, and looked like a B-24 type bomber. [Mysterious about 1'. Not placed up by radar, no response to IFF or VHF. Disappeared from light cover [BLANK: 1360 T.

1800 (H) Sighted Belafoe Island bearing 1360 T.

1 January 1945

A hearty welcome to 1945. Slicwed to one engine speed during day to conserve fuel.

8 January 1945

Test fired 40 MM gun during morning.

2255 (H) Great Netuma Island contacted by SJ radar bearing 2700T, range about 45 miles.

2330 (H) Commenced passage between Great Netuma and Sochi Bear Island. During the entire passage the Islands were not sighted due to poor visibility.

3 January 1945

0616 (H) With Midai Island bearing 3150T range 21 miles, Altered course to 2150 T.

0815 (H) Ship contact #23. Sighted small sailboat bearing 2230T, distant about 10 miles. Avoided.

1458 (H) Sighted Mondarik Island bearing 2260 T, distant about 30 miles.

- 27 -

— page 158 —
1513 (H) Submerged in order to time our passage through Tambola Islands after dark.
: 1907 (H) Surfaced.
: 2110 (H) Passed Merdarlk Island ebeam to starboard, distant 7 miles. Commenced passage through Tambelan Islands.
: 4 January 1945
: 0309 (H) Completed passage through Tambelan Islands. Set course for Krimita Street.
: 0613 (H) Passed Fdjejantan Island abeam to port, distant 18 miles.
: 1120 (H) Ship contact #24. Sighted and exchanged signals with the U.S.S. Icarus.
: 1724 (H) Sighted Scrutu Island bearing 0990T distant about 50 miles.
: 1936 (H) Went to three engine speed and commenced passage through Kerimeta Strait.
: 1952 (H) Sighted the first of several white lights on Scrutu Island, some of which wore moving, apparently on automobiles.
: 2252 (H) Ship contact #25. Radar contact, bearing 150 relative, range 7700 yards. Strung loft to put contact astern.
: 2253 (H) Interference on SJ radar from contact, the first we have noted. Exchanged recognition signals and calls with contact, with turned out to be Gabilan. It was never sighted from bridge.
: 2258 (H) Ship contact #26. Radar contact dead ahead, range 12,000 yards. Turned out to be Baya, with whom we exchanged calls. Baya requested our heading, which we sent them.

What a spot! Caught in between two of our subs in the middle of Krimite Strait, both of them heading at us at about eighteen knots.

— page 159 —
2309 (H) Back on our base course, with everything normal again.

: 2340 (H) Sent message to Faye on Su giving our base course. Had intercommunication from Faye to westward for remainder of evening, but never sighted her.

: 5 January 1944

: 0500 (H) Cleared Kartmastra Strait, act course 1200T, and slowed to two engine speeds.

: 0515 (H) Exchanged calls by Su with the Faye bearing 2000T.

: 1750 (H) Sighted Bower Island bearing 1470T, distant 60 miles.

: 1809 (H) Ship contact #27. Sighted smoke over the horizon, bearing ULTRA. Immediately altered course to investigate.

: 1822 (H) The tops of five vessels were sighted. One looked like a three ishken trachtor, mist forward and aft, stack anticiples, making very heavily. Just ahead heavily, a ship was on engines aft. Further away, a ship appeared to be a small freighter. The tin rests of two other ships were sighted, and it is believed that they were small patrol boats. The enemy was on course 3400T, and it is clear that the enemy was on 0100T, heading them for trading, for example.

: 1825 (H) Altered course to remain out of sight and attack after dark.

: 1943 (H) Commenced radar tracking. Radar picked up the largest ship, which was the three ishken trachtor, at 15,000 yards. This range indicated the target was far away. Weak interference was encountered on Su, and the radar detector picked up interferences from another SE.

: 2000 (H) The plan decided on was to attack larger ship from sternboard flank. This ship could be seen at 14000 yards, the right being clear, visibility excellent. Decided to fire long range surface shot instead of submerged shot because we were only in 30 fathoms of water.

— page 160 —
2032 (H) Range to target 10,000 yards. Rader had contact on the three frigatibars, but not the escorts.

2050 (H) Convoy on course 0100 T, speed 6 knots. With angle on bow of target 550 starboard, range 9950 yards; changed course to hock in at slow speed, showing minutes distance.

2059 (H) With range 7700 yards the escorts appeared on radar screen, and cleared slightly on starboard flank. The other on port flank. Decided to fire at 3500 yards, as the ships could be seen very plainly on radar at 700 yards. For the remainder of the operation and attack, the TBT was used for bearing, the radar for ranges.

2112 (H) With range 3600 yards the set-up was beautiful. Our target had slightly overstepped the engine aft ship and TDC was tracking nicely. Quickly swung right to 1000 starboard track, zero gyro angle and at.

2113 (H) Commenced firing tubes #4, #5 and #6, #0 spread, the first torpedo fired to hit, second 10 right and third 10 left. Used a 10 second firing interval, depth set 4 feet. The wakes of the torpedoes stood out like a scree thumb as they headed for the target. After firing #6 tube, increased speed to full and swung left with full rudder to put convoy astern.

2115 (H) The first torpedo hit the freighter transport about 2 minutes 40 seconds after firing. This target disintegrated and sank in a cloud of heavy black smoke after a slight explosion which sent a small ball of fire about 100 feet in the air. About 28 seconds later the second torpedo hit the engine aft ship, which exploded in flames and sank immediately. From this way this second target went up, believe it was on Oiler.

2121 (H) Three flashes and the noise of gunfire were seen and heard from direction of convoy. Range was 6800 yards, and radar now had only 3 contacts. Decided to clear this area and head for the hundred fathom curve.

2133 (H) Heard and felt the first of two tremendous depth charge explosions, about two minutes apart. I guess the depth charges sound louder in shallow water.

— page 161 —
2225 (H) Radar contacted Bawden Island 1710 T, range about 40 miles.

6 January 1945

0355 (H) Sighted Maslombo Boar bearing 0850T, range about 30 miles.

0419 (H) Radar contacted Maslombo bearing 0750 T, range 22 miles. Intercept course to be well clear of this island at dawn.

1127 (H) Plane contact 750. Picked up by radar at 7 miles, and it closed rapidly to 5 miles. No response to LT. Not sighted from radar. Sky overcast.

1128 (H) Summaged.

1216 (H) Surfaced.

1347 (H) As we were approaching 100 fathom curve, decided to start further. First reading obtained was 43 fathoms, which struck with chart. However, a few minutes later the water began to swell, and quickly went from 29 to 10 fathoms. Quietly sawing left, and a couple minutes later the depths were about 6 fathom. |

— page 162 —
2200 (H) Entered Lombok Strait. Have all machine guns and 40 MM manned, defensive purposes only.

: 2220 (H) Interference lost on radar detector, lat. 8-27 S., long. 115-50 E.

: 2334 (H) Cleared southern end Lombok Strait. Nothing sighted except few lights on beach. Ren into heavy rip tides as we increase Strait.

: 2340 (H) Radar detector encountered sweeping type radar interference at 107 megacycles, lat. 8-27 S., long. 115-50 E.

: 2342 (H) Sighted very brilliant light off East tip Nusa Besar, elevation about 30°. At first it was thought to be an airplane or boat closing us, but neither SJ or SD could contact anything but land. The light finally either faded out or disappeared behind Nusa Besar.

7 January 1945

: 0830 (H) Officer of the deck and lookout sighted possible periscope bearing 650 relative, range about 2000 yards. Maneuvered to avoid. Our position at this time was lat. 10-48 S., long. 115-31 E.

8 January 1945

: 1640 (E) Fired all automatic guns and trained new men in the handling of these guns. The gunner's mate made up a couple targets which we threw over the side for this purpose.

9 January 1945.

: 0023 (H) Radar detector encountered a weak sweeping signal on 200 megacycles, position lat. 17-05 S., long. 113-52 E. This interference persisted for about 12 hours.

: 1944 (H) SJ picked up interference of two others, one ahead and the other astern, but we were not successful in exchanging signals with either. Position was lat. 20-31 S., long. 113-06.

: 2210 (H) SJ picked up land bearing 1400T on a second trip only. The land was 80 to 90 miles away.

— page 163 —
10 January 1945

0028 (H) 3F contacted another submarine believed to be
Flounder, dead ahead range 15000 yards. 3F also
had interference from just bearing, but was unsu-
cessful in examining calls. Avoided. Not sighted
from ridge. Position of contact lost. 21-21 S.,
long. 113-04 B.

0310 (H) Sighted Waring Head Light bearing 1090 distant
26 miles.

0514 (H) Passed Waring Head Light abeam to starboard,
bearing 1800, range 5 miles. and commenced steering
various courses to outer enemy. Gulf.

0815 (H) Moored port side to starboard side YT10, Exmouth
Gulf, Western Australia.

1145 (H) U.S.S. Hoo stood in and moored to port side YT10.

1629 (H) Underway from YT10, and stood out channel. The
following was accomplished during our stay here:

(1) Received 15,600 gallons fuel oil.
(2) Received personal and official mail forwarded
by CM-71.
(3) Converted #3, #4 and #5 fuel ballast tanks to
main ballast tanks.
(4) Overhauled deck guns and greased topside fittings.
(5) Provided all lands with one "Aussie" size beer.
(6) Held swimming call.
(7) Sent WA message to CM-71.

1921 (H) Passed Waring Head Light abeam to port, distant 5
miles. Hoo in sight stern of us.

11 January 1945

Enroute Fremantle. Sighted Hoo during morning just
forward of port beam. Hoo disappeared from sight
during early afternoon.

2004 (H) 3F contacted last hearing 0590T, range 60 miles, not
repeat not a second trip echo. Our position, lat.
26-28 S., long. 112-10 E.

2005 (H) Radar detector picked up interference on 200
megacycles.

- 33 -

— page 164 —
12 January 1945

0930 (H) Sighted and later exchanged calls with U.S.S. BLENNY.
1436 (H) Submerged to conduct trim dive and flush out F.B.T. #3, #4 and #5 which had been converted to M.B.T. at Exmouth Gulf.
1521 (H) Surfaced.
1700 (H) Received casualty instructions for entering Fruntrata. Duty in vicinity sighted several ships which appear to be operating together in the Submarine area.

13 January 1945

0035 (H) Sighted Rottnest Light bearing 1440T.
0420 (H) Arrived at rendezvous and exchanged recognition signals and calls with HECP.
0606 (H) Sound, Medical and Relief Crew Officers reported on board.
0608 (H) Commenced sound test.
0651 (H) Completed sound test.
0710 (H) Made degaussing run.
0730 (H) Completed d.gaussing run and entered Fremantle Harbor. Moored in nest outboard U.S.S. BLENNY.

— page 165 —
35 -

Subject: U.S.S. CAVILLA - Report of Third War Patrol.

(C)  WALKER

During the first 12 days of December the seas were very rough, sky overcast, and weather squally. This condition delayed our entrance into the Dangerous Ground by two days due to lack of time. For 4 days the skies were clear and sea calm, but on 15 December the sea was increased and we were in for another long stretch of rough weather. On 20 December a typhoon warning was received. For two days we suffered the consequences of being on the edge of that typhoon, and after that, we exited back to our normal rough weather. The rough north-east seas and overcast skies lasted until we departed station the last of December. Enroute to an area 200 miles west of Okinawa, in the north of the area 200 miles west of Okinawa, in the north of

— page 170 —
1. USS CAVITTA - Report of Third War Patrol

Type (s) | Date | Time | Type | Notes
--- | --- | --- | --- | ---
1 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
2 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
3 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
4 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
5 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
6 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
7 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
8 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
9 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
10 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
11 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
12 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
13 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
14 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
15 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
16 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
17 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
18 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
19 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
20 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
21 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
22 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
23 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
24 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
25 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
26 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
27 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
28 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
29 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
30 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
31 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
32 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
33 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
34 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
35 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
36 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
37 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
38 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
39 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown
40 | 12-12-45 | 12-12-45 | Unknown | 1.8 miles Unknown

No Answer: T/F

— page 173 —
0346 (H), Date 11-35-44, Lat 2-21 N, Long 107-20E.

TARGET DATA: NAOHI Class heavy cruiser in company with unconfirmed 12-ft cruiser. The ship were steering a steady course, with CL keeping station on port beam of CA. The contact was made by 3V radar. Visibility of the night was about 15,000 yards.

SHIP SINK: One heavy cruiser, NAOHI Class, 10,000 tons.

DAMAGE DETERMINED BY: Watched four torpedoes hit target, which exploded, broke in two, and sank.

TARGET DATA: Target draft 17 feet, course 070, speed 15, range at firing 2,700 yards.

CIVIL SUIT DATA
Speed 10, course 346, surface attack, angle at firing 0.

FIRE CONTROL AND TORPEDO DATA
TYPE ATTACK: This was a night radar surface attack. After making one round torpedo toward flank of target until angle of view was 30 degrees, reached in at slow speed, flying him close to zero silhouette until time of firing, when we quickly swung right to zero range and commenced firing. Radar ranges and bearings were used to track target during approach phase, TET bearings and radar ranges during attack phase. All fire control instruments and torpedoes functioned properly. Fired four torpedoes from bow tubes, all hit.

- 43 -

— page 174 —
U.S.S. AVALIA - Report of Third W Patrol.

| Subject: | TORPEDO ATTACK NO. 1 |
|||
| Tubes Fired | 5 | 6 |
| Track Angle | 100 S | 100 S | 100 S |
| Gyro Angle | 22° 1. | 12° 2. | 12° R |
| Depth Set | 6 ft. | 6 ft. | 6 ft. |
| Power | High | High | High |
| Hit or Miss | Fit | Fit | Fit |
| Erratic | No | No | No |
| MK. Torpedo | 23 | 23 | 23 |
| Serial No. | 65836 | 65797 | 41387 |
| MK. Exploder | 6-5 | 6-5 | 6-5 |
| Serial No. | 26809 | 26768 | 26773 |
| Actuation Set | Contact | Contact | Contact |
| Actuation Actual | Contact | Contact | Contact |
| MK. Warhead | 16-1 | 16-1 | 16-1 |
| Serial No. | 191-8 | 13110 | 17361 |
| Explosive | Torpex | Torpex | Torpex |
| Firing Interval | - | 15" | 10" |
| Type Spread | Divergent | Divergent | Divergent |
| Sea Conditions | Calm | Calm | Calm |
| Overhaul Activity | USS BURYATE USS BURYATE USS BURYATE USS BURYATE |

Remarks: All torpedoes ran hot, straight and straight.

— page 175 —
U.S.S. C.V.M.I.A. - Report of Third War Patrol.

(TARGET DATA - DANGER INSTRUCTIONS)

DESCRIPTION:
Battleship, possibly Yamato Class, escorted by three uracistified destroyers. One DD was stationed on forward bow, two on port. Contact was made by JU radar at 23,000 yards. Visibility excellent. Aircraft could be seen at 18,000 yards.

SHIPS SINK OR DAMAGED: None.

TARGET DATA:
Target draft 30 feet, course 355, speed 18, range at firing 2700 yards.

OWN SHIP DATA:
Speed 4, course 105, depth 90 feet, angle at firing 0.

FIRE CONTROL AND TORPEDO DATA

TYPE ATTACK:
Tracked from ahead on surface until we were sure of speed and zig plan. Went to radar depth when we were dead ahead of target on his base track, range 16,000 yards. With target range 7,000 yards went to periscope depth. My plan was to fire bow tubes, on a large track, after starboard escort cleared me. Three minutes before firing was forced to go deep to prevent ramming by escort, also forced into stern tube shot. Fired by sound, 120 starboard track, gyro angles 7 to 12 right. No hits, reason unknown.

— page 176 —
U.S.S. CAVALIA - Report of Third War Patrol.

(H) ATTACK DATA

| TURBINE ATTACK NO. 2. | 7 | 8 | 9 | 10 |
||----|----|----|----|
| Tubes Fired              | 117 | 118 | 120, 5 | 121.5 |
| Track Angle             | 70 | 80 | 100 | 11.50 |
| Gyro Angle              | 10 | 10 | 6 | 6 |
| Depth Set              | 10 | 10 | 6 | 6 |
| Power                  | High | High | High | High |
| Hit or Miss            | Miss | Miss | Miss | Miss |
| Erratic                | No | No | No | No |
| MK. Torpedo             | 23 | 23 | 23 | 23 |
| Serial No.              | 61834 | 41532 | 50242 | 33879 |
| MK. Exploder           | 6-5 | 6-5 | 6-5 | 6-5 |
| Serial No.              | 26772 | 26806 | 26761 | 17969 |
| Actuation Set          | Contact | Contact | Contact | Contact |
| Actuation Actual       | None | None | None | None |
| MK. Warhead            | 16-1 | 16-1 | 16-1 | 16-1 |
| Serial No.              | 17462 | 12979 | 14712 | 17985 |
| Explosive              | TPX-2 | TPX-2 | TPX-2 | TPX-2 |
| Firing Interval        | - | 10 Sec. | 7 Sec. | 8 Sec. |
| Type Spread            | Divergent | Divergent | Divergent | Divergent |
| S.ea Conditions        | Moderate | Moderate | Moderate | Moderate |
| Overhaul Activity      | U.S.S. | U.S.S. | U.S.S. | U.S.S. |
|                      | EFAYAL | BURYALE | BURYALE | BURYALE |

Remarks:
There torpedoes were fired with torpedo runs 2800 to 2900 yards end on what appeared to be a good set-up. Reason for misses is unknown.

— page 177 —
2112(H), date 1-5-45, Lat. 5-00 S, Long. 112-16 E.

TARGET DATA AND DAMAGE INFLICTED

DESCRIPTION: Five ship convoy consisting of one small Freighter
    Transporter, one small schooner or cutter, one small freighter
    or sea truck, and two small patrol boats. Contact was
    made by aircraft attacking or snipers. The attack was at
    night on the surface with visibility 14,000 yards.

SHIPS SINK: One Small Freighter Transport - 2,000 tons (EU)
    One Small Schooner or Cutter - 1,000 tons (EU)

DAMAGE: Both ships were discovered to disintegrate and disappear
DISTINGUISHED BY: in less than a minute after being hit by one torpedo
    each.

TARGET DATA: 21ST CENTURY TRANSPORT
    Draught 10 feet, engine 30, speed 6, range 3500 yards.

OWN SHIP DATA: Speed 30, course 29C, surface attack, gyro angle 0.

PILOT CONTROL AND TORPEDO DATA

TYPE ATTACK: This was a night radar surface attack. The visibility
    of the night was such that radar was of no use. The
    After obtaining a fix on the target, we
    speed kept the ship on course and
    speed

— page 178 —
U.S.S. CAVILLA - Report of Third War Patrol.

TORPEDO ATTACK NO. 3.

Tubes Fired 4 5 6
Track Angle 100 S 100 S 98 S
Gyro Angle 10 R 0 20 L
Depth Set 4 feet 4 feet 4 feet
Power High High High
Hit or Miss HLT HLT Miss
Erratic No. No No
Mark Torpedo 23 23 23
Serial No. 50258 49187 65780
Mark Exploder 6-5 6-5 6-5
Serial No. 26802 26798 14316
% Actuation Set Contact Contact Contact
% Actuation Actual Contact Contact None
Mark Warhead 16-1 16-1 16-1
Serial No. 14730 1,668 14633
Explosive Torpex-2 Torpex-2 Torpex-2
Firing Interval -- 10 seconds 10 seconds
Type Spread Divergent Divergent Divergent
Sea Conditions Calm Calm Calm
Overhaul Activity USS EURYALE USS EURYALE HSS EURYALE

Remarks: All torpedoes ran hot, straight and normal.

— page 179 —
1. MINES
No enemy mine fields were observed. However on 14 December in lat. 9-22 N, long. 123-24 E., sighted a drifting mine and sank it with small arme gunfire. It was apparently a moored type mine adrift. There were two concentric rings of spikes or horns showing, also a small cylindrical projection on the top of the mine. Heavy sea growth and corrosion indicated it had been overboard for quite some time.

(J) ANTI-SURFACE MINE PATROL TACTICS.
Following first attack, which was made on the surface, we turned at full speed at left scene, giving escort a zero silhouette. We were not sighted, because several depth charges were dropped in vicinity of attack, but no gunfire. Only one depth charge was dropped after our second attack, which was a night submerged attack. However, it is believed that the torpedo wakes were not sighted, and the enemy only suspected our presence. The third attack was a surface attack, and we retired in the same manner as after first attack. We were not sighted because the escorts did not fire their guns until we were well clear, and then after that dropped two depth charges. It is believed radar equipped planes were used in the Philippine area at night, although there is a possibility some of these planes were our own.

(K) MAJOR DEFECTS AND DAMAGE.
1. MAGNITINERY AND ELECTRICAL.
(a) On 10 December a break through occurred in the outboard wall of #3 main engine machinery, resulting in excessively low noise operation at all speeds. At very high speeds the diversion of overburden discharge water through this break prevented this power cooling of exhaust gases, resulting in exhaust containing a quantity of steam and sparks.

(b) On 31 December #3 main engine showed excessive fresh water cooling system pressure after a 5 minute warm-up prior to being put on propulsion. The engine was scoured and examination showed that #8 liner had developed a crack about 4 inches long on the inner wall, extending from a small pit adjacent to one of the stud bolts, and about 1/8 inch above the chromed

— page 180 —
U.S.S. CAVALIA - Report of Third War Patrol.

surfaced down toward the seaward edge of the submarine. The line was not cracked externally. Exhaust gases forced their way through this internal break in the liner wall into the fresh water jacket, thereby building up the pressure in the entire fresh water cooling system of the engine. This cracked lining is considered to have resulted from a faulty failure occurred about 25% earlier in the liner had been in service for 255 carrier a.u.r.s. and in volume of even partial flooding of the inner tube would be found.

(c) The critical part of the main engines in the higher loading compartment was the turbine, which produced exceptionally large exhaust pressure. #3 and #4, enclosed were the largest of the turbines, and it is believed that the more than 2700 cubic feet of seawater on all but the top two compartments ran at a rate of 1,000 cubic feet per minute. The turbine was controlled by a 12-volt electric control.

2. TORPEDOES AND GUNNERY

(a) One Mark 23 torpedo developed on air leak in the main air pipe from the predealer to the starting valve. This leak was at the "treaded joint, and was apparently due to a faulty seating job.

3. HULL

(a) The #1 periscope motor hoist shook mounting was damaged and shifted when the periscope jammed due to the periscope nozzle. The #2 round gear hydraulic piston rod partially unscrewed from the supporting yoke on several occasions due to the brass keeper shearing off.

(c) The air conditioning condenser vent nipples, port and starboard units, carried away due to electrolytic action.

(d) #1 and #2 fresh water tanks were in very poor condition. Rusty water was the rule from these tanks. Cement wash had been applied to the surface of these tanks during the last refit.

4. NAVIGATION

(a) The Spencer "watertight" binoculars failed to be watertight. All binoculars in general service became

— page 181 —
U.S.S. CAV.II-A - Report of Third War Patrol.

Subject:  clouded due to moisture. In severe! pairs there was evidence of salt water actually having entered the barrels. This failure was due largely to faulty seals of bivalves during last refit. Other evidences of poor waterproofing were stripped threads on various security screws, and in two instances, the barrel was placed over the hole down screws were missing completely.

(b) The DEAT was correct at slow speeds on several occasions. This trouble was traced to faulty operation of the speed input cable, caused by tilting bearings and general break of many screws.

(c) The pitotometer loss was correct at slow speeds on several occasions. This trouble was due mainly to sticky operation of the pump motor. The speed required blowing out at least every week. Apparently sea growth or corrosion collected very quickly in the dynamic orifice.

(L)  RADIO

No difficulty was encountered in our transmissions, all messages from CTIP-71 were received, and there were no major casualties to any of the radio gear. No communication was established with aircraft on VHF, but good communication was had between boats at ranges from one to five miles. VHF transmissions blocked CDR scope so that it is impossible to locate ships on the scope. The VHF also puts out a spurious signal at 135 megacycles when the set is in the warm up condition and is not transmitting. The LR showed a strong signal from this source. A continuous watch was maintained on Radio Cushing, an reception was very good on 1155 and 1245 kcs. Sounds were received at 0200, 1000 and 1800 zebra.

(M)  RADAR

1.  SJ RADAR - The operation of this gear was excellent. Ranges were good, and it was indispensable to Navigation on the way to and from station, picking up low land marks (200 to 600 feet) at ranges of 20 to 30 miles. The following re-engagments were corrected by ship's force during the patrol:

   (a) On 30 November H.V. aircraft fuses F9 and F10 in control unit continued to burn out. Investigation showed 836 tube in H.V. Rectifier had broken base and shorted

- 51 -

— page 182 —
U.S.S. CAVILIA - Report of Third War Patrol.

plate to ground. Replaced tube.

(b) The precision sweep on 1 December would not stay centered. Receiver gain was low and "3" rectifier varied from 275 to 295 volts. The cause was found to be a "soft" 54UG tube in "B" regulated rectifier. Replaced tube and readjusted "B" voltage to 300 volts.

(c) On 12 December it was noted that there was very poor sea return. On examination found leaky TP tube in transmitter receiver. Replaced tube and retuned activity. Checked all units transferred.

(d) Low and variable positive was noted on 31 December. Investigation showed oscillatory not in tune, TP tube had bad tips and 5V1 overaged. Replaced TR tube and 5D21. Returned oscillator and all components.

2. SD RADAR - With all the overcast weather we had on station, this gear proved to be a little slower. Ranges were very good, and as high as 35 miles or 15Y elevaton 60. Several night contacts were made about 6 miles when the radar was being keyed overy 30 seconds. The antenna had a definite null point around 180° relative, plane 6° high at about 20 miles was not picked up or this 3D steering 175° to 190° relative. The following descriptions were corrected by ship's force during the patrol:

(a) On 10 December the following was noted: excessive plate currents of 20-25 ma, AN/SPA showed PEF of 120 to 180. Double pulsing was found to be caused by improper setting of grid resistor and 5V. Reset RG and 5V, replaced 0014 oscillator tubes in event currents had damaged them.

(b) The following was noted on 21 December: low echoes, low current, overload relay kicked out frequently, and double pulsing was continuous. This was corrected by resetting grid snrting bar and lowering 5V.

3. IFF - Operation of the BK was satisfactory. Daily checks were made by momentarily triggering with the BN to see if the BK was transmitting only when triggered, and to check the coding sequence. Operation of BN was also satisfactory throughout patrol.

4. LORAN - Daily checks were made to test for proper circuit control. The gear was not used, and maintenance problem was simple.

- 52 -

— page 183 —
5. R.D.A.R. DETECTOR - Operation satisfactory. Interference with the following characteristics was picked up:

(a) Heading north, when just south of Lombok Strait, picked up interference from two radars as follows: (1) 4 Nof., (2) 5 Scythe 200, Puls Wdth 2.3, Swop Rate 6.3.

(b) Heading south, when just north of Lombok Strait, picked up what appeared to be a radar target, picked up interference as the ship was moving eastward on an extremely narrow course. Interference was limited to a small area. The ship was located within 5 miles of the radar target. The ship was located at 6.3 miles from the radar target. The ship was located at

— page 184 —
12/15/44 0730 12-23 N. 116-02 E. 60 negative gradient from 180 to 290 feet.

(P) HEALTH, FOOD AND HYGIENE

The health of the crew has been below average. One case of appendicitis was transferred to the U.S.S. COUGIL the same day we departed on patrol. Our reaching Emsworth Gulf a possible ship's illness was transferred. No laboratory services were available at Emsworth and therefore no definite diagnosis could be made, but rather than take a chance on the health of the crew and man, made the transfer. One case of scabies was treated with excellent results. One man was treated for an abscessed tooth while on station, and since 26 November, a period of about seven weeks, the pharmacist's rate has been treating a ruptured appendix case. Special care and food has been given this man for nearly 50 days, and in the opinion of the Commanding Officer, the performance of duty of Chandler, R.L., CPhM(A), U.S.N., was outstanding. None of us envy Ureta, P., QMC, U.S.N., who was forced to spend practically the whole of this patrol in his bunk. The food situation was not too good. Various canned vegetables were not obtainable before leaving on patrol, and as a result of eggs being rationed us, we were unable to serve eggs since the middle of the patrol. Habitability would be improved forward if another air conditioning unit could be obtained for installation in the Control Room.

(Q) Performance of duty of all hands was excellent. I wish particularly to commend the Executive Officer, Lieutenant T. B. Denegre, U.S.N.R., on the manner in which he took charge of the Control party in the Conning Tower during night surface approaches.

(1) Number men on board during patrol 72
(2) Number men qualified at start of patrol 64
(3) Number men qualified at end of patrol 68
(4) Number unqualified men making their first patrol 4
(5) Number men advanced in rating during patrol 13

(R) MILES STEAMED - FUEL USED

| Miles Steamed | Fuel Used |
|||
| 1750           | 23,980    |
| 9670           | 89,100    |
| 1750           | 24,000    |

Fremantle to Area
In Area
Area to Fremantle

- 54 -

— page 185 —
13
: 500 Gallons
: 20 Days
: 5 Days

Limiting factor this patrol - Occurs.

RADIO AND RADAR COMBAT SERVICE

RADIO - On only three occasions was any strong evidence of radio jamming noted. Each of these times it was possible to partially read through the Jamming signal by tuning slightly off frequency of the signal. However, a complete message could not be obtained. On 27 November and 4 December, the 4155 schedule of Radio Choughling was turned by a string signal sending random CW signals for nearly an hour. This jamming was monitored by a lock-in receiver. On 13 December, the 9250 schedule of WX was jammed so as to be unresolvable. Jamming was nullified by slight frequencies.

RADAR - On 21 November two radars were intercepted. The first was detected at 1st. 8-59 S., long. 115-41 T. Data furnished by the detector equipment received a possible land based radar for air search with a frequency of 175 and pulse rate of 200. For a short time it appeared that this radar was tracking us. The second, at a frequency of 200, was probably a search light control unit as shown by the radar detector and known information on deep radar. It is not known whether this radar was switching was not detected at 1st. 7-51 S., long. 116-49 D., frequency 162, pulse rate 510. It had the characteristics of a radarsearch radar. There was no evidence of a low visibility. Another radar, frequency 200, was detected at 1st. 8-56 S., long. 115-42 S. The signal was very strong and was picked up in some vicinity as the one on 21 November. Soon after interception a bright light appeared on Nusa Bear. Data from the detector and known information on deep radar, showed this radar to have the characteristics of a ballistic control radar. (Mark IV Mod III). The pulse rate was 980.

— page 186 —
U.S.S. CAVILA - Report of Third War Patrol.

(V) RUMORS

The month of December was one of the most consistently bad weather months I've encountered in my patrols to date. Clouds and overcast skies made pilots scouting very difficult, but thanks to the good operation of the 5D, we were able to dive in time to evade many outcasts. However, the strain of 47 days in the air, only 5 of which were spent submerged, began to tell on all hands at the time we departed for home. The three patrol runs of the month have averaged 60 days in length.

— page 187 —
5-18/A16-3/(00)
Serial 052
CONFIDENTIAL

FIRST ENDORSEMENT to:
U.S.S. CAVALLA (SS-304) -
Report of Third Torpedo Patrol.

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

Subject: U.S.S. CAVALLA (SS-304) - Report of Third Torpedo Patrol.

1. During this Third Torpedo Patrol the CAVALLA acted as a unit of a coordinated search and rescue group in the general vicinity of Dangerous Ground. Three torpedo attacks were made.

2. Attack No. 1 on 25 November was a night surface attack on a heavy cruiser. After tracking by radar for an hour and a half, four torpedoes were fired from excellent position, range 2700 yards. All torpedoes hit the target, completely demollishing it. The CAVALLA evaded an escorting warship on the surface.

Attack No. 2, on the night of 2 December 1944 was a sound shot on a battleship with three escorts. The group was tracked on this surface for an hour and a half. The CAVALLA went to radar depth when on the base course; then, after fifteen minutes, went to periscope depth. The near escort headed for the CAVALLA, either as result of sound or sight contact or by chance, forcing her deep. The escort passed directly overhead and one minute later within a ninety foot the four stern tubes were fired on sound bearings, generated range 2300 yards, spread coverage ninety percent. All torpedoes missed and after one depth charge, the CAVALLA surfaced an hour after the attack.

Attack No. 3 on 5 January was a night surface attack on two small ships of a five ship convoy contacted in the late afternoon while on the return trip thru the CAVALLA. Three bow tubes were fired at a freighter transport and an overlapping small tanker, range 3500 yards, 100° track. Both ships were hit and both explode. The CAVALLA evaded on the surface.

3. The material condition upon return from patrol is good. A normal roff by U.S.S. CAVALLA (A322) and Submarine Division 151-2 Relief Crew will be made. The cleanliness of the ship was outstanding.

— page 189 —
219
FE24-71/A16-3
Serial 0240
C-O-N-F-I-D-E-H-T-C
SECOND ENDORSEMENT TO:
USS CAVALIA (Cdr. L. H. T. L.

— page 190 —
FE24-71/A16-3
Serial 0240
C-O-N-F-I-D-E-I-T
SECOND BNDRSJT TO:
USS CAVALLA Conft. Lt.
dated 13 January, 1944.
Report of Third War Fetrol.

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

Subject: U.S.S. CAVALLA (SS244) - Report of Third War Patrol - Comment on.

1. The Third War Patrol of the CAVALLA, under the command of Commander H. J. KOSSELER, U.S.N., was conducted in the JAV. SEA. and in the areas of the SOUTH CHINA SEA as one of a coordinated Search and Attack Group consisting of EAYA (CTC), CAVALLA and HOE.

2. The first attack, on 25 November, took place southwest of GREAT MOTOR ISLAND in the shallow water which prevails in that area. A night surface attack was pressed home on two warships proceeding apparently without escort at fifteen knots speed. The approach was carefully conducted, and until just before firing a zero angle of approach was maintained, so that the target was totally unprepared for the salvo of four torpedoes, all of which hit and blew the target apart. The second ship observed to be beyond and smaller than the primary target, dropped twelve depth charges.

3. The second attack, on 2 December, was frustrated when one DD escort forced CAVALLA to evade imminent collision submerged just before firing. The attack was completed from sound bearings as soon as the destroyer had passed overhead, but unfortunately no hits resulted. On 8 January, in the JAV SEA, CAVALLA made an excellent night surface attack and sank two small ships with two hits from three torpedoes.

4. From 13 December to 30 December I reported reconnaissange duty was performed in connection with PHILIPZINE ISLAND occupation.

Last HINTS: Award of the Submarine Combat Insignia is
authorized by the U.S. Navy.

GEO. 03181
LCT
4 01833

— page 191 —
16-3(8)(R-3-4/Jk)
Serial: 01196
COUNTER OFFICER:
PRINCE KINGSTON, USN
USS CAVALIA COLT. Lt.
dated 13 January, 1945.

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

Subject: USS CAVALIA (88244) - Report of Third War Patrol.

1. Forwarded.

2. The Commander Seventh Fleet congratulates the CAVALIA for the damage inflicted on the enemy.

T. C. KINKAID
2-03716

Copy to:
ComSub7thYLT
ComSubron 18
CO USS CAVALIA

— page 192 —
SS244/416-3
Serial No. 010.
DECLASSIFIED

From:  The Commander Officer.
To:  The Commander in Chief, United States Fleet.
Via:  (1) The Commander Submarine Squadron TWENTY TWO.
       (2) The Commander Submarines SEVENTY FLIGHT.
       (3) The Commander SEVENTY FLIGHT.

Subject:  U.S.S. CAVALLA (SS244), Report of War Patrol
Number Four.

Enclosure:  (A) Subject Report.
       (B) Track Chart (ComSubs7thFlt).

1. Enclosure (A), covering the Fourth war patrol of this vessel conducted in the South China Sea and French Indo-China Area during the period 8 February 1945 to 25 March 1945, is forwarded herewith.

DECLASSIFIED

— page 193 —
1945, 3, #4, and the auxiliary engine completely overhauled.

(1) #3, #4 and the auxiliary engine completely overhauled.

(2) New mufflers installed on all main engines.

(3) Replaced compressor on #2 Kleinschmidt vapor compression still.

(4) #1 and #2 main engine given 500 hour overhaul.

(5) Replaced armature on #2 IC motor generator.

(6) Completely overhauled the motor armature and replaced the motor and reduction gear bearings or #2 low pressure blower.

(7) Resurfaced all four fresh water tanks with cement wash.

(8) Attempted to install booster blower in ship's ventilation line forward. However, the installation was not successful due to the excessive noise and vibration it created.

(9) Replaced solid type SR radar reflector with the modified perforated type.

(10) Installed veritable speed reversible training control for SR radar mast.

(11) Installed lower hatches on after battery, after engine room and after torpedo room. Also provided three extra security lugs on both torpedo loading hatches.

(12) Considerable work done on pintometer log and DHAI during refit and training periods.

-1-

— page 194 —
13) Received sound test and ran the magnetic range.

(14) Ship pointed light gray.

Underway for training exercises 29 February to 6 February. Reader and zeo approaches were made, conducted convoy exercises, and fired three Mk. 14 exercises. The 4 inch gun was fired at to towed target. Attended one patrol of convoy college with Blonny and Hoc. Looking was accomplished 6 - 7 February.

Lieutenant (jg) Edward L. Eads, E-V(G), U.S.N.R., was detached and ordered to Submarine Division 152 for duty. Ensign Donald W. Honza, O-V(S), U.S.N.R., reported on board for duty. Readiness for sea 8 February 1945.

(3) NARRATIVE

Following is the list of officers and chief petty officers attached to this vessel, with total number of p.troi's made, including the fourth patrol of this vessel just commencing:

| Name          | RATIO | No. | Periods |
||-------|-----||
| Kossler, Herman J. | 8     | 8   | 10      |
| Denegre, Thomas E., Jr. | 8     | 8   | 10      |
| Sable, Edward T. | 8     | 8   | 10      |
| Rand, Arthur C., Jr. | 8     | 8   | 10      |
| Fage, Edward C., Jr. | 8     | 8   | 10      |
| Zellner, Ernest T. | 8     | 8   | 10      |
| Gachey, Vance L. | 8     | 8   | 10      |
| Kochne, Edward J., Jr. | 8     | 8   | 10      |
| Honza, Donald W. | 8     | 8   | 10      |
| Ryan, Lloyd E. | 8     | 8   | 10      |
| Wart, Woodrow W. | 8     | 8   | 10      |
| Malco, Marion I. | 8     | 8   | 10      |
| Walker, Robert P. | 8     | 8   | 10      |
| Lee, James R. | 8     | 8   | 10      |
| Sable, Edward T. | 8     | 8   | 10      |
| Milson, Harold J. | 8     | 8   | 10      |
| Chandler, Raymond L. | 8     | 8   | 10      |
| Cottrell (A.) (T) | 8     | 8   | 10      |
| Cottrell (

— page 195 —
8 February 1945

1300 (H) Underway from nest elor.side U.S.S. SURYALZ, Transatle, West Australia, and stood out channel in accordance with Commander Task Group 71.1 operation order no. 19-45.

1539 (H) Submerged, conducting trim dive.

1604 (H) Surfaced.

1651 (H) Conducted day and night runs on 1943 BONTRY. Secured runs long enough to pass officer messenger mail to target, which proved to be a difficult job in the heavy seas.

2220 (H) Dismissed the escort and proceeded on our way. Hoo took station on port beam.

9 February 1945

1220 (H) Sighted U.S. Submarine heading southward, but was unsuccessful in exchanging calls.

1323 (H) SD radar contacted plane at 13 miles, later sighted from bridge. Plane answered XFF.

1341 (H) Submerged. Conducted approach on Hoo, followed by deep dive. No serious leaks found.

1431 (H) Surfaced. Due to very heavy seas, decided not to make any more dives.

10 February 1945

During morning tested VHF and 3D radar with Hoo. Seas still very heavy.

1507 (H) Submerged. Conducted approach on Hoo.

1535 (H) Surfaced.

11 February 1945

Seas still heavy. Steering course to pass through position where Mingo lost two men. Eerolised at surface drills during day.

— page 196 —
1743 (H) Sighted southbound U.S. Submarine. Did not exchange calls.

: 1912 (H) Sighted another southbound U.S. Submarine. Did not exchange calls.

12 February 1945

: 1415 (H) Passed through Mingo's position during morning, nothing sighted. Seas glassy.

: 1442 (H) Submerged. Conducted approach on Hoo.

: 1444 (H) Reversed course and maneuvered clear of Hoo, then fired all automatic guns. Instructed new men in the operation of the guns.

: 1515 (H) Sighted British submarine, probably the Thule, well clear. Did not exchange calls.

13 February 1945

: 0820 (H) Hoo proceeded independently in order to make transit of Lombok about one hour ahead of us.

: 1224 (H) Sighted distant British submarine. Changed course to close in order to get information on Lombok.

: 1300 (H) Tchchanced calls with Spek, who gave us all the dope on Lombok.

: 2213 (F) Began picking up land on the radar, range about 45 miles.

: 2258 (H) Detector pick up interference on 195 miles.

14 February 1945

: 0030 (H) Entered Lombok Strait. Manned automatic guns while passing through narrow per of southern entrance. No contacts in Lombok. Sailed immediately for home and Hwakbili while making passage.

-4-

— page 197 —
0100 (H)  Recieved message from Hoc that she had been forced down by radar plane two miles north of Lombok.

: 0230 (H)  Cleared Lombok Strait. SD has been left scoured, relying on radar detector.

: 0720 (H)  Ship contact #1. Maneuvered to avoid a sailboat, distant about 8 miles.

: 0623 (H)  Ship contact #2. Maneuvered to avoid another sailboat.

: 0857 (H)  Plane contact #1. SD radar contact, range 26 miles. No answer to IFF.

: 0906 (H)  Plane in sight, range 15 miles, and it resembled a PEY.

: 0911 (H)  Plane disappeared from radar and sight astern.

: 0930 (H)  Plane contact #2. Picked up by radar, range 7 miles, closing fast. Not sighted from bridge. No answer to IFF.

: 0931 (H)  Submerged.

: 1043 (H)  Surfaced.

: 1519 (H)  Plane contact #3. Picked up by radar, range 13 miles. No answer to IFF. Sighted from bridge at 12 miles on port beam. Altered course to give plane, which looked like a Betty, a small silhouette. Plane disappeared from radar at 14 miles, and from sight about 20 miles.

: 2230 (H)  Passed Moselembo Beacon beam to starboard, distant 13 miles.

: 2237 (H)  Ship contact #3. Sighted sailboat, and then picked it up by radar, bearing 350 relative, range 1200 yards. Made radical change of course to the right to avoid.

15 February 1945

: 0223 (H)  Radar made contact on an unidentified, unidentified object, possibly a sailboat, on the port beam range 1300 yards. Avoided. Position 5-25 S., 113-09 S.

— page 198 —
0621 (H) Sifted Beaven Island bearing 1650T, range 40 miles.
: 2132 (H) Commenced passage through Farimata Strait at four engine speed.

16 February 1945
: 0155 (H) Radar detector encountered sweeping interference on 210 megacycles. Probably a British submarine. We are scheduled to pass one, and this is the frequency of their radar.
: 0200 (H) Ship contact #4. Picked up by radar broad on port bow, range 3600 yards. Although it passed aboard of us at about 8000 yards, it was not sighted from bridge. Contact was soon lost astern, but the interference from their radar lasted for about a half hour.
: 0500 (H) Passed Sarootoe Island light beam to starboard, distant 9 miles.
: 1826 (H) Crossed the equator at long 106-55 E.
: 2133 (H) Set course to pass 12 miles west of Badas Islands, and between Mendarik and Tokong Oewi Islands.

17 February 1945
: 0021 (H) With Mendarik Island bearing 2900T, range 7 miles, set course North.
: 1043 (H) Submerged. Conducted trim dive.
: 1214 (H) Surfaced.
: 1232 (H) Sighted Midai Island bearing 0770T, distant 35 miles.
: 1443 (H) Sighted Noord Hooiberg Island bearing 0730T, distant 25 miles.
: 1703 (H) Received message from CTF-71 telling us to send weather report tonight and tomorrow.
: 2119 (H) Sent our message #1 to CTF-71.

— page 199 —
U.S.S. CAVALIA - Report of Fourth War Patrol.

18 February 1945

Surface patrol, nothi... sighted.

2113 (H) Sent our message #2 to CT-71.

19 February 1945

0100 (H) Received area assi... from CTF-71. We are to patrol as paoi with Hoc.

1232 (H) Received message from Hoc. Due to mistake either in our sending or her receiving, she made passage through Katakata on 18 February instead of 15 February, as I had intended. Each arrangements for rendezvous on 22 February.

20 February 1945

0708 (H) Submerged. Conducted trim and deep dive. Zerosied new mon on planes.

1012 (H) Surface.

1947 (H) Encountered interference from another SJ.

2046 (H) Ship contact #5. Exchanged recognition signals and calls with Flounder.

21 February 1945

1107 (H) Plane contact #4. Sighted on starboard beam, range -out 20 miles, not picked up by radar. It looked like a EFAY. Established communications by radio with plane. It soon disappeared from sight.

1145 (H) Plane contact #2. Radar contact 8 miles closing fast. Not sighted from bridge. No answer to IFF.

1146 (H) Submerged.

1310 (H) Surface.

2119 (H) Received message from Hoc saying she could not make dawn rendezvous due to heavy seas. Cancelled rendezvous, told Hoc to patrol to seaward next five days, Cavalla patrol beach.

— page 200 —
22 February 1945

0508 (H) Ship contact #6. Contacted by radar bearing 280°T, range 6500. Commenced tracking. Radar could not pick up contact outside 8000 yards, and it could not be seen from bridge.

0535 (H) Target tracking on course 130°T, speed 4-6 knots. Opened out from target to gain position ahead for submerged attack. Beginning to get light, sees very heavy, and identity of target not definite. It is believed to be a patrol boat or fishing boat.

0629 (H) Target could be seen through high periscope, and looked like a large patrol boat.

0654 (H) With angle on the bow of target zero, range about 10 miles, submerged, and commenced heading in for close observation, and attack, if feasible in those heavy seas.

0751 (H) Went to battle stations. Target not yet in sight.

0814 (H) Target still not in sight. Apparently it was a patrol boat which stood to sea for about 30 miles, and shortly after dawn, reversed course and went back home. Visibility not good due to intermittent rain squalls.

0837 (H) Heard three distant explosions bearing about 230°T, which sounded like torpedo hits, followed by several rumbling explosions which might have been depth charges.

0921 (H) Surfaced about 28 miles off shore and commenced surface patrol parallel to beach.

1300 (H) Plane contact #6. Picked up by radar, range 9 miles, closing. Not sighted from bridge. No answer to IFR.

1301 (H) Submerged to avoid detection, and changed course to close beach.

1916 (H) Surfaced.

2054 (H) Received orders from CTF-71 to lock for downed aviator. Commenced search to northward. Visibility excellent in this bright moonlight.

— page 201 —
23 February 1945

0028 (H) Slighted green flare over horizon bearing 1700T. Increased speed and increased course to head for it.

0046 (II) Slighted second green flare bearing 1650T. Thought for sure we were on trail of downed evictor.

0049 (H) Exchanged recognition signals by radar with Hew, bearing 1700T. I figured she was heading in on flares also. We were 12 miles from the Beach.

0101 (H) Slighted third flare, bearing 1700T.

0116 (H) Slighted fourth flare, same bearing, still over horizon.

0120 (H) Received message from Hoe that she was firing the flares. Altered course to North to search in that direction.

0751 (H) Submerged about 13 miles off an Ye Point, and set course to close beach.

1003 (H) Plane contact #7. Sighted single engine unident- ified type plane in direction of beach, range about 5 miles.

1050 (H) Ship contact #7. Sighted sailboat very close to beach.

1152 (H) Steered two ships lat 14-17 N, long 109-10 E. One appeared to be a small AK guard with docks and superstructure above water. The other appeared to be a small AK surf, with stack and rafts showing.

1247 (H) Ship contact #6. Sighted with lack of like an anchorage. Port left, lat 11-14 N, long 109-10 E. near it appeared to be a sunken AK, silo stack, docks awash with large light.

1655 (H) Plane contact #8. Sighted a "Betty", range about 5 miles, headed south along beach. As we watched, it turned hard left and appeared to be heading for our periscope. Went to 120 feet for 15 minutes. All clear when we came to periscope depth again.

1926 (H) Surfaced, and set course away from Coast. Very bright moonlight.

- 9 -

— page 202 —
24 February 1945

0637 (H) Plane contact #9. Radar contact, range 12 miles. Also picked up by 3V, same range, bearing 100 relative. Contact disappeared in about two minutes. No answer to 7V.

0650 (H) Submerged to conduct parlor patrol.

0836 (H) Plane contact #10. Sighted single engine unidentified plane in direction of beach, range about 12 miles.

1045- (H) Plane contact #11. Sighted unidentified plane in direction of beach, range about 15 miles.

1107 (H) Plane contact #12. Sighted twin float low wing plane type "Ruff" in direction of beach, range about 7 miles.

1637 (H) Ship contact #9. Sighted three sailboats very close to beach.

1706 (H) Altered course to open out from beach.

1925 (H) Surfaced 13 miles from An Yo Point.

2158 (H) Sighted a floating mine about 400 yards to port, 14-27 N, 109-27 W. While maneuvering clear of this mine, missed a second mine by about ten yards.

2208 (H) SJ radar made contact, on possible mine, range 1000 yards. Not sighted. (Threatened course to clear this field of floating mines.

2307 (H) Sighted mine on port beam range 600 yards. SJ then contacted another mine on port bow, range 1000 yards, which was also sighted.

2308 (H) SJ picked up another mine 150 on port bow, range 800 yards, which was then sighted. All these mines appeared to be the spherical, 4 hundred, moored type.

2342 (H) Sighted a seilboat, which radar picked up at 2600 yards and lost at 3200 yards. Avoided.

— page 203 —
25 February 1945

0030 (H) to 0250 (H)
Those were the maddest two hours I've ever spent on patrol. 5C made contact on about ten possible mines, range 600 to 2000 yards, none of which were sighted. We ran into four more sailboats, which we had trouble avoiding without heading back towards where we had sighted the mines. And to top it off, we radar tracked a double trip echo from Vung Tau Point for almost an hour.

0340 (H) to 0545 (H)
All is quiet again, except that we are in a very heavy fog, and can't even see the bow of the ship. This fog lasted the remainder of the night.

0755 (H) to 0845 (H)
Sent message #3 to CP-71 reporting the mines and negative results in our search for the downed aviator.

0845 (H) to 0845 (H)
Sighted floating mine dead ahead about 3000 yards. Altered course to covid, and then commenced circling it. 14-44 N, long 109-55 A. Due to heavy seas were unable to hit mine with 20MM. However, about 15 hits were made with the 50 cal., 30 cal., and 20 cal. These made no impression on the mine. You could hear the ping as the bullets hit it.

0845 (H) to 0845 (H)
Decided to investigate sailboat that had been sighted forty-five minutes earlier, and appeared to be getting closer.

0855 (H) to 0855 (H)
Plane contact #32. Radar contact, range 10 miles, closing fast. Not sighted from bridge. No answer to INF. Decided to give to avoid detection if possible.

0855 (H) to 0910 (H)
Submerged. Went to 150 feet and made radical change of course to right.

0910 (H) to 0910 (H)
Two close heavy explosions, probably caused by plane dropping depth bombs in vicinity of where we dived. Retained submerged remainder of day. Sighted several very distant sailboats during day.

1913 (H) to 1913 (H)
Surfaced.

— page 204 —
2010 (H) Sent message to Hoe telling her we would patrol to Eastward until mine field drifted south.

26 February 1945

0339 (H) Received message from Hoe that she had sunk a Destroyer yesterday, and would patrol close to beach today.

1004 (F) Plane contact 1144. Racer contact, 26 miles. Answered I.F. established radio communications with plane, and he said he could proceed north along coast and ret. carry contacts to us.

1148 (H) Plane reported contact on small convoy 45 miles southeast of Tournee, heading on course 0400ft. We were in position to intercept, so altered course and increased speed to do so.

1222 (H) The plane revised his last report and said the convoy was heading for Tournee. We could do nothing about this, so gave up chase and continued patrol.

1233 (H) Plane reported he was returning to base due to fuel shortage.

1252 (H) Sent message to Cuitarro asking them if they had received plane contact. Received negat back, so sent plane contact to them. Patrol led towards beach for remaiter of day. Reversed course at 2215 (H) when about 10 miles from beach.

27 February 1945

1145 (H) Plane contact 1155. Radar contact, 22 miles, not sighted from bridge. Answered IFF. Attempted to contact plane by radio, but was not successful.

1155 (H) Sighted floating mine about 300 on port bow, range 4000 yards, 14-52 N, long 109-50 E. Commenced circling mine at about 250 yards, firing 20F at it.

1202 (H) Kine exploded with a terrific explosion, putting out a large thick cloud of white smoke. Shrapnel could be heard flying through air. Don't recommend shooting at one of these closer than 200 yards.

1217 (H)

— page 205 —
1945 (H) Called Hoo and asked her if she had reported sinking the Destroyer to CTF-71. Received negative reply, so told Hoo we would make the report.

2166 (H) Received contact report from Hoo of convoy she had sighted this morning. Believe it is too late now to sayhiring about it, but anyway, incrasssap speed and headed for Cape Betangan.

2328 (H) Patrollies, ten miles off Cape Betangan, but guess the convoy has already gone by.

28 February 1945

0048 (H) Opened out from land and sent our message #4 to CTF-71.

1158 (H) Plane contact #16. Radar contact, 16 miles, answered ITF. This turned out to be sector search plane, with whom we established radio communications. The plane closed in to 4 miles but was never sighted due to heavy overcast.

1345 (H) Received contact from plane on one DD and one SC, 85 miles southwest of us, heading south. Too far away for us.

2056 (H) Took departure from Cape Betangan, range 14 miles, and commenced patrolling to seaward.

1 March 1945

1029 (H) Sighted floating mine bearing 3200 relative, range 800 yards.

1037 (H) Commissioned circling mine at about 300 yards, firing 20MM gun at it.

1108 (H) Plane contact #17. Radar contact, 21 miles, no answer to ITF, and unable to establish radio communications. Plane disappeared from screen at 22 miles.

1127 (H) Mine sank, having been punctured by 20MM shell. No explosion, although white smoke could be seen coming out hole before it sank. Position 14-32 N, long 110-04 E.

— page 206 —
1138 (H)
Very heavy fog set in, which lasted for about two hours.

1255 (H)
Plane sent contact report on DE, south of us, heading south at 15 knots. Tried to establish communications with boats south of us but was unsuccessful, so at

1330 (H)
Sent plane contact out blind twice.

1404 (H)
Baya requested repeat of our message, which we did.

1903 (H)
With Culao Re Island in sight, range 19 miles, changed course to head to seaward in order to convert #4 FBT to a MET, and to make scheduled rendezvous with Hoe.

2130 (H)
Completed conversion of #4 PET.

2325 (H)
Exchanged recognition signals with Hoe, told her to man VHF and close us.

2 Merch 1945

0022 (H)
Exchanged information and patrol instructions with Hoe, who was 500 yards on our starboard beam. We were unable to contact Hoe on VHF until she had closed us to 1500 yards.

0057 (H)
Set course to open out from Hoe in order to make dive to flush out #4 MET.

0048 (H)
Submerged and flushed out #4 MET.

0221 (H)
Surfaced. Set course for Nuoc Island.

0447 (H)
Sighted mine bearing 2900 relative, range 1500 yards. Avoided. Position, 14-42 N, long 109-46 E.

0708 (H)
Submerged 14 miles East of Nuoc Island, and set course to close coast.

0935 (H)
Sighted the first of many sailing junkes that were seen during day. These boats were operating about 5 miles or the beach.

1138 (H)
Plane contact #16. Sighted B-24 flying north along coast, fairly low. About twenty minutes later the bomber was seen heading south along coast.

— page 207 —
1145 (H) Altered course to patrol parallel to beach, range 4 to 5 miles.

1925 (H) Sur laoed. Nothing sighted during day except a couple of wrecks on the beach and a lot of fishing boats.

2002 (H) SJ radar made contact 100 on port bow, range 1100 yards. This was the first of fifteen contacts made during the next hour and forty-five minutes. Of these contacts, four were plucked up at from 4 to 5 thousand yards, while the remainder from 1000 to 1200 yards. The night was bleak, sea calm. After the moon came up the contacts were identified as sailboats with their small boats out. However, during that dark hour and forty-five minutes, it was a mad flail trying to avoid so many unidentified contacts.

2204 (H) Ponce again resigned on the Cavalla, and the Commanding Officer went below and had a cup of coffee. He could have used something stronger.

2301 (H) Sent message to Hoe telling them that we would patrol on the Batangan tomorrow.

3 March 1945

A fog commenced setting in during the early morning, and at 0700 (H) visibility was down to 2000-3000 yards.

0721 (H) Ship contact 715. Radar contact, bearing 2000, range 8000 yards. Our position was 18 miles, bearing 152T, from Cuba Re Island.

0812 (H) Target tracking on course 2300T, speed 2 knots. Sent contact report on area frequency. Radar detector picked up very weak sweeping interference on 195 megayelcs. Thought maybe we might have a DS or patrol boat. Visibility about 2000 yards. Decided to dive ahead of contact and have a look before making an attack.

0840 (H) Submerged. Fence to target 5000 yards, but not visible from bridge.

— page 208 —
0923 (H) Target has not been sighted, although it should be over us by now. Sound could pick up nothing. Deadlcd to open out from track of target and surface.

: 1000 (H) Fog lifted momentarily and target was sighted bearing 0070T, range about 3000 yards. It was a large three masted sailing junk. Apparently the dampness in the air had caused the strong radar reflection from this wooden hulled vessel. The radar interference which had been plocked up was probably from Cullao Is Island. Decided to open out somewhat from target, surface and investigate it.

: 1040 (H) Surfaced. Fog has closed in again. Target not in sight but we have him on radar. Sent message on pack frequency that my contact was a junk.

: 1125 (H) In position 2000 yards on starboard beam of target, on parallel course, between target and the beach, about ten miles from beach. Tracit not in sight. will wait until it can be seen from this range before closing.

: 1328 (H) Fog lifted. Mentioned all automatic guns and closed target. Circled it several times at 500 yards range and then closed to 50 yards. It was very harmless looking, and was manned by Chinese. Retired to Eastward on the surface before heading back to Cape Batangan. Fog has now completely lifted, and the coast is in sight.

: 2234 (H) Radar detector picked up interference on 195 megacycles. There must be a radar either on Cullao Re Island or Cape Batangan.

: 2343 (H) Detector picked up intermittent sweeping interference on 145 megacycles, probably a plane.

4 March 1945

: 0030 (H) Sent message to Hoo assigning patrol station for tomo:row, and told them we would patrol off Cape Batangan.

: 0415 (H) Sighted and avoided a sailboat.

— page 209 —
0542 (H) Detector picked up interference on 172 messages, possibly one of our search planes.

: 0703 (H) Submerged 13 miles bcarine 1557 from Culo Ro Island. Set course to patrol on northern limit of area, midway between this island and Cape Betange, about 7 miles from sea. During the morning sighted several sailboats.

: 1402 (E) Ship started to sail. JP picked up scores bearing 1990T. Not the kind one seen toward port side. Since we were at northern limit of our area thought it might be one of our subs, so changed course to put contact astern.

: 1417 (H) Supersonic search picked up pinging in direction of JP scores. Still rothlar could be seen through periscope. Increased speed and came to normal approach course.

: 1444 (H) Sighted tanker with 2 DS es escorts. The Convoy was hugging the coast near Cape Betange, anele on the bow about 60 starboard, range about 12,000 yards. It locked hopeless, but went to 90 feet and increased speed to standard on normal approach course. Went to battle stations.

: 1510 (H) Plane contact 412. Sighted two single engine float type planes that were patrolling back and forth to seaward or convoy.

: 1525 (H) The set-up was hopeless. The convoy was raking twelve knots, had rounded Cape Betange, the angle in the bow now about 1250 starboard, range about 12,000 yards.

: 1530 (H) Altered course to open out from land so I could send contact report.

: 1722 (H) Came to 50 feet, raised 3D mast, and attempted to send contact report.

: 1726 (H) Something hit us with a loud bang in vicinity of bridge. It could be heard and felt throughout ship, but was particularly loud in the Conning Tower. I was on the periscope, and immediately thought a plane had dropped a depth bomb on us which hadn't exploded. Whatever hit us seemed to hit, bounce and then hit again. Nothing could be seen through periscope. Went to 60 feet and lowered periscope and radar mast. I was sure we had a depth charge.

— page 210 —
1840 (H) Sunked. Nothing on deck and no damage could be found.

1846 (H) Sent contact report on area frequency.

2003 (H) Detector picked up sweeping interference on 145 megacycles.

2031 (H) Sent our message #5 to CFR-71.

2048 (H) Flare contact. 120. Picked up by radar at 16 miles and lost at 17 miles. No answer to IFF. Attempted to call plane by radio but received no reply.

2053 (H) Detector picked up weak sweeping interference on 185 megacycles which persisted for about an hour.

2131 (H) Detector picked up weak sweeping interference on 195 megacycles which persisted for a half hour.

5 March 1945

0010 (H) Avoided a sailboat. Notified Hoc we would patrol off Cape Sable tomorrow.

0033 (H) Detector picked up weak sweeping interference on 195 megacycles which persisted for a half hour.

0104 (H) Notified Hoc we would patrol off Cape Sable today.

0452 (H) Contacted the first of many sailboats sighted during day.

0645 (H) Light for set in, but it was very thick over the land. Cape Sable was not visible at 10 miles. Patrolled on surface 10 miles off Cape.

1016 (H) For began to lift, land in sight. Submerged and closed beach.

1054 (H) Over a period of a couple minutes five light sharp explosions were heard. Unable to identify the source of these explosions.

1216 (H) Patrolled remainder of day parallel to beach and 5 miles from it. Canned out a little from beach before surfacing. Many sailboats and rowboats sighted during day.

— page 213 —
1927 (H) Surfaced 8 miles from beach and commenced surface patrol parallel to beach. Three large fires could be seen on beach north of Cape Mia.

: 1957 (H) One of the fires on beach flared up in large pillow of flame, as it oil dump had gone up. I wonder if those exclusions we heard this morning were our bombers dropping a few over here?

6 March 1945

0008 (H) Notified Ice we would patrol off Cape Anzo during day.

0117 (H) Detector picked up interference on 160 messages, which lasted for several minutes.

0521 (H) Commenced passing through a large fishing fleet of sailboats and rowboats.

2704 (H) Submerged 10 miles off Cape Anzo, and set course to close the beach. It was a terrific job keeping clear of the fishing boats. At one time during the morning we counted 49 sailboats around us.

1150 (H) Changed course to parallel the beach, 4 miles off the beach.

1227 (H) Flane contact 121. Sighted twin tail bomber, probably a B-24, flying north along the coast.

1916 (H) Surf. coil. Commenced surface patrol parallel to beach, 8 miles off the beach.

1955 (H) Bashaw requested she be assigned patrol station in our area while waiting to perform special mission.

2226 (H) Hse received special mission from CDR-71.

2315 (H) Sighted large fire on beach near Tamquam, which flared up at one time as it from explosion.

7 March 1945

0030 (H) Notified Beach to patrol area south of latitude 14-30 N, and that we would be on surface to northward.

1015 (H) Kind and seas began to increase and sky became completely overcast. Looks like the beginning of a storm.

- 19 -

— page 214 —
1107 (H) to 1112 (H)
: 1113 (H)
: 1258 (H)
8 March 1945

Very heavy seas, strong wind, and sky completely overcast. Intermittent rain squalls during the day.

1122 (H) Plane contact 23. Radar contact 19 miles which closed to 17 miles then faded out.

1226 (H) Exchanged recognition signals and calls by SJ radar with the Basheaw. Later, sighted the Basheaw heading south.

1235 (H) Sighted and investigated a small fishing boat that was lying to a sea anchor. They had apparently lost their foremast, but were not at all interested in us.

1543 (H) Closed the beach to about 12 miles and fixed our position, then opened out again.

9 March 1945

0640 (H) Again sighted the fishing boat lying to a sea anchor. He doesn't seem to have made much progress towards home.

0907 (H) Plane contact 22A. Radar contact, range 15 miles. He answer to LT. However, called by radio and established communication with sector plane.

0922 (H) Plane reported contact on two ships heading south at 10 knots, in position 14-59 N, 108-59 E, very close to beach. We were in position to intercept, so increased speed and headed in towards beach.

1003 (H) Sent the contact report to Kce and Basheaw, and told them we would give off Point Anjo. Message received for by Hoe but not Basheaw.

- 20 -

— page 215 —
1021 (H) Submerged 9 miles off Point Hero. Due to poor visibility we were able to set this close to coast before leaving to dive. At 10 knots, figure ships would be off Fortin Bay between 1230 and 1300. Seas very rough, visibility poor. Took observation every 10 minutes, and between looks, went to 75 feet and spaced up in order to close point.

: 1107 (H) Subj contact J12. Sighted DLR or old DD, 400 feet, radio about 10,000 yards, engine on bow 45 port. Went to better st time, increased speed, and changed to normal approach course.

: 1115 (H) Target making better than 20 knots. Won't be able to reach a favorable firing position. Two sets of pinjacs can be heard, but due heavy seas, have been unable to locate any other ship.

: 1123 (H) Sound picked up severe on our scherb card quarter. Raised periscope and looked, and there was another DE, and the two J2 reports said our speed scores about 400 relative. At some time, sound reported that the DE which had passed close aboard from starboard to port had slowed down. Came to port, apparently had on port quarter, large angle on bow, apparently had slowed. Nothing in sight on starboard bow. Friendly JP had gotten a reiroroeal bearing. Before I could do anything about the DS on port quarter, he again speeded up and both DE's went over the hill. Making better than 20 knots. Things happened so damn fast that my head was in a whirl. If an conditions had visibility had been better I might have been able to do something about these two targets. These were the two 10 knot targets reported by plane. Patrolled vicinity Anvo remained or day and nothing else sighted.

: 1508 (H) Plane contact 225. Sighted small land based plane heading north along coast.

: 1922 (H) Surfaced. Sent contact report on our sighting this morning to Joe and Peaks #6 and #2.

: 10 March 1945

: 0840 (H) Plane contact 226. Radar contact, range 14 miles, no answer to JP, unable to contact by radio. At 11 miles it turned into two contacts. Planes then

— page 216 —
1120 (H) Sighted a large fishing fleet off Point Anzo.
    Avoided.

: 1135 (H) Hammerhead ordered by CTF-71 to join my wolf pack.

: 1203 (H) Plane contact #27. Radar contact, range 15 miles,
    no answer to LT, unable to contact by radio.
    Plane disappeared from screen at 18 miles.

: 1227 (H) Sighted and investigated a black lighted channel
    buoy which was adrift, 14-58 N, 109-10 S.

: 1352 (H) Closed to about 50 yards and investigated a sailing
    junk. The crew was chinese.

: 1415 (H) CD encountered jamming interference, apparently on
    the same frequency, and it seemed to be a series
    of dots.

: 1421 (H) Plane contact #28. Radar contact, range 18 miles,
    no answer to LT, unable to contact by radio.

: 1423 (E) Plane closed to 14 miles, but could not be sighted
    from bridge. Very difficult to pick up contact on
    radar due to jamming.

: 1424 (H) Lost contact on screen. Submerged.

: 1656 (E) Surfaced.

: 1834 (E) Sent our serial #5 to CTF-71.

: 11 March 1945

: 0325 (H) Received message that Hammerhead would rendezvous
    with us 0500 (1:1) tomorrow. Also was notified by
    CTF-71 that crew C-2 was all ours.

: 0915 (H) Sighted possible periscope on starboard beam,
    range 600 yards. Took avoiding action.

: 0942 (H) Plane contact #29. Radar contact, range 14 miles,
    answered LT, unable to make contact by radio.

— page 217 —
0946 (H)
Radar now had two planes, at 11 and 13 miles.
0948 (H) Sighted two planes from bridge, and they appeared to be large bomber type. Lost contact by radar and sight at 17 miles.
0950 (H)
Plane contact #30. Radar contact, 15 miles, answered IFF, unable to make contact by radio. Plane disappeared from screen at 18 miles.
1015 (H) Plane contact #31. Sighted unidentified plane, probably PB4Y, range about 10 miles, closing.
1057 (H) Radar contacted plane, range 8 miles, no answer to IFF, unable to make contact by radio.
1058 (H) Submerged.
1248 (H) Surfaced.
2230 (H) Received message from CTF-71 about aviators on a raft 15-17 N, long 109-33 E. We were 38 miles from this position, the closest of my peak, so sent message to Hse that we would search, and one to Hammerhead delaying rendezvous until tomorrow night.

12 March 1945
0231 (H) Sighted the first of several green flares, which turned out to be the U.S.S. Brill searching to north of us. Until daybreak we attempted keep clear of Brill, and conducted search firing several flares.
0737 (E) Closed brill and exchanged signals. She had had no luck with her search, and reported she was returning to her area. We continued the search on the surface.
1110 (H) Sighted and passed oiose abeard a small doughnut shaped, block and yellow striped rubber ring. Too rough to pick it up.
1430 (H) Having covered what we considered all possibilities of drift of raft to the southwest, changed course to southeast to cover that area and at same time head towards our rendezvous.

— page 218 —
1518 (H) Plane contact 422. Hader contact, ranges 14 miles, closing fast. No answer to IV, unable to contact by radio. Visibility now poor, with intermittent rain scud.

1520 (H) With range 9 miles and plane still closing, submerged.

1639 (H) Surf. scud. Proceeded at two engine speed to rendezvous, re-racing enroute.

2014 (H) Rechanged recognition signals and calls with Hoc by radar.

2117 (H) Unable to pick up Hammerhead at rendezvous. Asked Hoc is they had contacted Hammerhead and received negative reply. Told Hoc the rendezvous was cancelled, and for remainder of her time on station to patrol on surface.

2205 (H) Sent message by radio telling Hammerhead to make submerged patrol beginning tomorrow south of latitude 15°N, Cavalla north of that latitude, and Hoc on surface.

2236 (H) Hoc asked us if we had received CDR-71 despatched about the lost evacuees, and about an hour later received some question from Hammerhead. He had not received this despatched, probably were submerged at the time, so told Hoc to send it to us.

2330 (H) Received message telling Cavalla pack to search for lost aviators. Told Hoc and Hammerhead to report their positions, both of which were received within the next half hour.

13 March 1945

0745 (H) Sent following search plan to pack: search fast and fast, Hoc south of lat 15-55 N, Cavalla between 15-55 N and 16-10 N, Hammerhead between 16-10 N and 16-25 N. This plan will cover all possible positions of the aviators.

0727 (H) Sighted end exhausted calls with Hoc, and compared estimated positions.

1012 (H) Sighted end exhausted calls with Hammerhead.

— page 219 —
1046 (H) to 1055 (H)
Plane: contact 33. Sighted two planes bearing 3350T, range 10 miles, apparently circling about a point, lat 1604 N, long 109-20 S. One plane closed to about 4 miles while making a wide sweep, and it locked like a B-25. However, there was no response to IFF, and radio was unable to establish communications. Alters course to head over to where planes were circling. They both disappeared at 1055 (H) in low clouds.

1100 (H) Radar reported plane at 6 miles, which was sighted at 2950T, heading in towards us. No answer to IFF, and still unable to establish radio communications.

1101 (H) With range 4 miles, and plane still heading in, submerged.

1131 (H) Surfaced and proceeded at four engine speed to position where planes were previously seen to be circling.

1138 (H) Sighted Hammerhead bearing 340° relative. Closed and exchanged signals. Hammerhead had sighted planes, had not definitely identified them, and had been unable to communicate with them. Told Hammerhead about planes circling in this area, but nothing could be seen.

1159 (H) Opened cut from Hammerhead and resumed search in my lane.

1258 (H) Hoe reported SOS signal vicinity lat 15-49 N, long 110-16 E, and requested we try to get a plane to search near this position. We commenced calling for a sector search plane.

1310 (H) Contacted one of the search planes, relayed the Hoe's message, and asked what frequency the B-25s operated on in this area. The plane receipted for the messages, and then said she was returning to base. Nothing further was heard from this plane or any other.

1906 (H) Sighted Culao Cham Island bearing 2620T, range 30 miles. Closed to 20 miles.

1927 (H) From estimated drift of raft, figured it should be close to Culao Cham tomorrow. Decided to continue search with Hoe, and send Hammerhead south to patrol.

— page 220 —
2315 (H)
: 14 March 1945
: 0725 (E)
: 1146 (E)
: 1507 (H)
: 1900 (H)
: 2100 (E)
: 2113 (H)
: 2335 (H)
: 15 March 1945
: 0100 (H)
: 0300 (H)
: 0903 (H)
: 1330 (H)

: 26 -

— page 221 —
1515 (H) Passed an aircraft expendable gas tank. Changed course to 350°T to cover possible drift of this tank from our previous told positions of raft. Nothing further sighted during day. Haven't received any 'urther instructions from CTF-71, so guess I'm supposed to continue search.

16 March 1945

Petroling northeast of Cape Tourane.

0811 (H) With Cape Tourane bearing 232°T, range 21 miles, set course to open out from lend.

0845 (H) Sighted drifting mine, similar to those previously sighted. Position, lat 16-18 N, long 108-39 E.

0858 (H) Commenced airlaying mine and firing at it with 20 MM.

0900 (H) Mine exploded with large volume of white smoke.

1410 (H) Contacted seater plane by radio and asked them if they had seen raft. They replied in the negative, and said they would search for raft and shipping in vicinity of Cape Tourane.

1520 (H) Called plane as asked them to search area for raft for 90 miles south of us, and 15 miles east and west of our position.

1533 (H) Sighted possible periscope and took avoiding action, lat 16-06 N, long 109-30 E.

1548 (H) Plane contact #35. Sighted from bridge and picked up by radar at same time, range 8 miles. It appeared out of the overcast, there was no answer to LFT, radio was not in communications at the time, and the plane was heading in at a fast clip.

1550 (H) Submerged. As we were going down, range to plane 5 miles, received answer to LFT. Immediately came to periscope depth and made preparations for surfacing.

1604 (H) Surfaced. Plane not in sight, but contacted it by radio and asked them to close us.

1620 (H) Received message from plane telling us from which direction they would be coming.

— page 222 —
1632 (H)
Sighted plane on start: bow, range 8 miles.
Plane closed and circle: several times very close while we had a little talk with them. They had heard nothing about plane survivors on a raft before this. They thought the Blower was still in this area, so we told them it would be the hammerhead and Gavalla for at least another week. We questioned the double rudder of the plane and said that was thought the sector planes were PB4Y, single rudder. The reply came back that the plane was a PB4Y-1 not a PB4Y-2. Finally we were both squared away, and the plane left to search to the South of us.

1737 (H)
Plane reported negative search and that they were going home.

2023 (H)
With Culo Ro Island bearing 2500 range 15 miles, changed course to North.

2305 (H)
Sent patrol instructions to Hammerhead.

17 March 1945
Very heavy seas, monsoon weather.

1122 (H)
With Culo Ro Island bearing 2050, range 15 miles, changed course to Northeast to head into very heavy seas.

1411 (H)
Plane contact #36. Radar contact, range 9 miles - closing, no answer to IFF. Made contact with sector plane to radio. With range to plane 5 miles and still no answer to IFF, asked plane how far he was from us. Received reply that they couldn't tell. Just about then the plane appeared out of the overcast astern, heading right for us, angle on bow zero. Could not identify plane, so crossed my fingers and at

1414 (H)
Plane passed directly over us and we were mighty happy to see friendly markings on it.

1415 (H)
Called plane and told them we had received no IFF response. They said their gear was on, but they would check it. Shortly after this received an IFF response, but no further word as to why it had not been received previously. Plane reported very bad weather near coast, and no contacts had been made.

— page 223 —
1733 (H) Submerged for evening meal.

1813 (H) JP and QC reported possible screw noises, lat 15-49 N, long 109-45 E. There appeared to be a regular fast beat which covered a band of about 100. Fish noises could also be heard on some bearing. Nothing in sight through periscope. This was a remotely possible submarine contact.

1834 (H) Surfaced. Nothing in sight. Set course to North-east in order to head into very heavy seas.

18 March 1945

Seas very heavy during day, skies overcast.

0020 (H) Notified Himmlerhead plane had made no sightings in our area today.

0928 (H) Contacted sector plane by radio and he reported no sightings.

0938 (H) Plane contact #37. Radar contact, range 18 miles, answered IFF, unable to contact by radio. Plane closed to 16 miles and then disappeared from screen.

1121 (H) Plane contact #38. Radar contact, range 26 miles, answered IFF, unable to contact by radio. Plane closed to 22 miles then opened out and disappeared from screen.

1325 (H) Sighted Culo Re bearing 2450T, range 25 miles. Obtained fix and then changed course to North.

1445 (H) Lat 15-34 N, long 109-27 E. High periscope watch sighted a torpedo bearing 200 relative, range about 1000 yards, coming in on about a 500 starboard track. The torpedo was fired into a force 4 sea, had apparently breached, and was sighted as it struck the face of a wave, sending up a large sheet of spray. There was also a wide track of grenish water steaming of torpedo, which originated from a large churnup spot no doubt caused by the impulse bubble. The OOD swung hard right, backed the starboard screw, and sounded the collision alarm, very fast thinking on the port of Lieutenant Arthur G. Rand, Jr., U.S. Navy. This allowed the torpedo to pass ahead, where it was again sighted from the bridge as it struck anchor wave before disappearing from sight. We continued swinging right and cleared the area going "all cleared frantic" on all engines. No periscope was sighted.

— page 225 —
1520 (H) Sighted two more distant sailing junks. The first two pegs at about 1000 yards, and although they looked harmless, they were making about 4 knots in direction of Yulinkan. Decided to take good look at next junk, and if it is carrying a cargo or flying a Jap flag, will surface and sink them all.

1544 (H) Third junk passed us at about 200 yards, no flag flying, no a parent cargo. Decided to surface and take closer look.

1858 (H) Surfaced. Closed junk to about 50 yards. There were about six men and a dog in the crew, and they looked as poor as their boat. No cargo in sight. left them and proceeded on four engines to take closer look at others. However, our star fix soon showed us we were not only in Flounder's area but also in blind bombing zone. Changed course to get out of here and let the sail boats go.

1950 (H) Exchanged recognition signals and calls with Flounder, and told them about the sailboats.

2350 (H) Gave Hammerhead periscope to make a submerged patrol tomorrow, and told them we would be submerged off Culao Chuan.

22 March 1945

0705 (H) Submerged to conduct periscope patrol off Culao Chuan.

1355 (H) Sighted sail boat which appeared to be lying to and fishing.

1907 (H) Surfaced. No other shipping sighted during day.

2045 (H) Received message from CTF-71, telling us to depart area tonight for refit at Subic Bay.

2130 (H) Notified Hammerhead we were departing area.

2300 (H) Sent our message #9 to CTF-71, giving STA Subio.

— page 226 —
23 March 1945:
0759 (H) Sliched a portable periscope bearing 1250 relative, range 300 yards. Cleared area at high speed.

1106 (H) Submerged to conduct trim and deep dive. No serious leak found.

1256 (H) Surface.

1600 (H) Set clocks ahead one hour to Item time.

24 March 1945.
0200 (I) Received message telling us our escort would be U.S.S. Holt, DE 736.

0727 (I) Passed through point Maxi, and commenced passage through safety lane.

1325 (I) Radar contact on two planes, one at 22 miles, the other 27 miles. No enemy to TF. Lost distant one in a cruise minutes. but closer on came in to screen at 25 miles.

1514 (I) Radar contact on plane, range 11 miles, not sighted from bridge. Answered TF. Plane disappeared from screen at 16 miles.

1523 (I) Radar contact on plane, range 6 miles, also picked up by SJ. Answered TF. Plane closed to 4 miles, then opened out and disappeared from screen at 7 miles. Not sighted.

0626 (I) Sighted our escort, and exchanged recognition signals and calls. Joined up with escort and proceeded Subi's way.

— page 227 —
U.S.S. CAVILLA  Report of Fourth War Patrol.

(C)  MATTER.

For the second patrol in a row we were hampered by a succession of bad weather, which at times was too rough for torpedo attacks, and at other times, prevented an effective submerged patrol close to shore. Overcast skies were usually the rule during the entire period on station, making it very difficult to sight planes during surface patrols. This was brought home to us one day when our sector plane slowly closed in to four miles, and then opened out again without being sighted from the bridge. For the first time in my patrol experience we ran into several days of heavy fog. At times you could not see the bow of the ship. It was very treacherous, in that sometimes it would close in on you and then open out again very quickly. Much rain and cold weather was also experienced.

(D) TIDAL INFORMATION.

The currents encountered in the area along the Indo-China coast between Quinhon Bay and Cape Batangan appeared to be controlled by the prevailing wind. Observations were made surface and submerged next to the coast and as far as 70 miles to seaward. During a twelve day period when the prevailing wind was 3450T, force 4, the set averaged 1750T, velocity 1.6 knots. With a shift of wind to 1600T, force 2, the set changed to 1350T, velocity 0.6 knots. This condition lasted for five days. In the area north of Cape Batangan, the same general current characteristics appeared to exist.

(E) NAVIGATIONAL AIDS.

Various lighthouses along the Indo-China coast were sighted, but none of them were lighted. The coast of the many good landmarks, all of which closely conform to the Coast Pilot. Several very bright fires were noted at times along the beach. Inasmuch as the traffic through this area hugged the coast, it is believed possible that those fires may serve as beacons for her shipping.

— page 234 —
U.S.S. CAVALIA - Report of Fourth War Patrol.

(H) ATTACK DATA.

No attacks made.

(I) MINES.

Although no enemy mines were observed, the mine field was found curselos in the middle of a floating mine field, comprising moored mines which were carried. From what we could see of these mines, and those we sighted later, they were all moored type, four herred mines. It was apparent that all the mines had been overboard quite some time due to the corrosion and sea growth on the exposed parts. They had probably broken loose from a field in the North China Sea, and were drifting south with the current. Following are dates and positions of mine sightings:

(a) 24 February, let 14-27 N, long 109-29 E. Sighted five mines at night in bright moonlight, and radar contacted several more possible ones which were sighted.

(b) 25 February, let 14-44 N, long 109-35 E. Sighted single mine which we were unable to destroy, although it was hit about 15 times by small arm and machine gun fire.

(c) 27 February, let 14-52 N, long 109-50 E. Sighted single mine, which exploded when hit by 20 MM gunfire. The resultant flash was greenish yellow with a large volume of white smoke.

(d) 1 March, let 14-32 N, long 110-04 E. Sighted single mine which sank after being holed by 20 MM fire. While smoke could be seen coming out of the hole before it sank.

(e) 16 March, let 16-18 N, long 108-39 E. Sighted single mine which exploded with large thick cloud of white smoke after being hit by 20 MM fire.

(J) ANTI-SUBMARINE RESCUES AND VASION TACTICS.

During the morning of 25 February we submerged for a plane contact, range 10 miles. Went to 150 feet, and made a 900 change of course to right. Two bombs were dropped by plane 15 minutes after we had dived, and they apparently exploded near where we had submerged or along our original course line. No other anti-submarine measures were experienced.

— page 235 —
1. MAJOR DEFECTS AND DAMAGE.
1. MACHINERY AND ELECTRICAL.
   (a) Excessive rotor backlash in #2 evaporator caused wear of rotors and drive gears, end they wore renewed on 11 February.
   (b) The liner sealing rings on cylinders #4, 12 and 13 of #3 Main Engine leaked fresh water and required replacement. On 16 February the head assemblies and liners were removed. The seal rings and all head assembly gaskets were renewed on these cylinders. These seal rings were of Australian origin, and were installed during the last refit.
   (c) On 20 February the keeper on one exhaust valve of #2 cylinder of the auxiliary engine stripped, thus making the valve inoperative. The head assembly was removed, the valve, keeper, inner and outer compression seal rings, and head assembly gaskets were renewed.
   (d) Both evaporators stopped producing water on 28 February that would test below 40 (Kielisimbu midt Tester). The cause was undetermined, probably pin holes in coils. After this date battery water was made by redistilling fresh water.
   (e) On 18 March the liner seal rings on cylinders #1, 5 and 14 of number three main engine failed, allowing fresh water to enter tub oil in crankcase. A similar casualty had occurred on 16 February. The faulty seal rings, of Australian manufacture, were replaced by rings of General Motors manufacture.

2. TORPEDOS AND GUNTRY.
   (a) The charge leads to torpedo #54055, Mk 18-1, were reversed when the torpedo was received. The leads were connected properly, and a thorough check of the remainder of the circuits revealed no other defects.
   (b) Torpedo #56357, Mk 18-1, developed a 52 volt ground after being subjected to sea pressure at periscope depth. A damaged hand hole cover gasket was found on #1 handhole. This gasket was replaced and the ground removed by drying the battery compartment. This torpedo has not been subjected to sea pressure since the repair was made.
   (c) Torpedo #56443, Mk 18-1, required a battery charge every four days. Apparently this battery is sulphated or also has an excessive amount of internal ground.

— page 236 —
3. HULL.

(a) The engine air induction outboard valve failed to open by hydraulic power about 80% of the time. The practice has been to assist the valve in opening by hand power at the start, then the valve continues to open under its own power. We difficulty has been encountered in closing the valve. The operating gear of the valve has been frequently inspected and lubricated during this patrol. This trouble has been encountered periodically since the first refit period, and in subsequent refits no reason or remedy for it has been found.

(b) The washing machine failed during the second week of the patrol, and could not be repaired. The teeth of the main drive gear were off and could not be built up by the ships force.

4. NAVIGATION.

(a) The Mk IV gyro compass was started on 13 February and run for five hours, when it suddenly became erratic. Investigation showed that the vacuum had been lost in both rotors, thereby exert circuiting and burning out one rotor. The water-tank was also burned out. The burned rotor was replaced with a spare, all circuits and units tested, the rotor running evacuating, and the compass placed in limited examination.

(b) The piston motor log has continually been erratic at slow speeds. The two major reasons for this condition appear to be the pump is worn out and the motor is not running. The pump is worn out so that the

— page 237 —
U.S.S. CAVALLA - Report of Fourth War Patrol.

excellent at times, very poor at other times. The planes were often off frequency, and establishing contact was sometimes impossible unless we drifted our frequency, which then made us lose contact with the other boats. All of the receivers except the Kingsley were satisfactory. The unstable tuning of this receiver seems to be inherent in the design. 3D interference was very bad above 2000 Kcs. It has been recommended that the shielding of the antennas input be increased during this refit. The VHF was entirely unsatisfactory. Maximum ship to ship range was 1500 yards, plane to ship 6000 yards. It was necessary to use the TEL at all times for plane-sub communications. The loop antenna was grounded throughout the patrol. This ground was apparently in the loop itself, and could not be removed.

(M) RADAR.

1. SJ RADAR.- The operation of this gear was very satisfactory. During the first part of the patrol occasional fluctuations of the input voltage caused the one amp fuse in the 450 V supply of the PPI to burn out. The difficulty was traced to defective insulation in the leads supplying 120 AC to the Control Unit. Other faults corrected by the ship's force were as follows:

(a) Erratic sweeps and a bed precision sweep resulted from poor regulation of the "PE" rectifier on 13 March. It was found that one of the 54UC tubes was gassy. This tube was replaced and the trouble was corrected.

(b) On 16 March one of the 54UC rectifiers shorted from plate to ground in the "4A" rectifier. This caused erratic tuning and poor gain control. In the process of repairing the rectifier, two tubes of this type were found to be defective upon installation. Up to the present, the average life of the 54UC has been 450 hours, and 30% of the new tubes have been found to be defective.

(c) On 17 March range on a 500 foot Island was found to be low, and sea return was below normal. The TR tube was replaced and the set returned, which corrected the trouble.

2. SD RADAR - The operation of this gear was excellent throughout the patrol. It was especially helpful in plane-sub communication; for it gave radio sample warning to start trying to contact plane, which often was hidden by clouds. Ranges on the PBAT's were as high as 33 miles. Land was picked up at 50 miles.

— page 239 —
U.S.S. CAVALIA - Report of Fourth War Petrol.

The sky was overcast, wind NNW, sea 4, and radio reception was below normal on the Fokker schedule.

| Station | Channel | Rate | Signal Strength | Location |
|||------|||
| W-N    | 2       | H-4  | E Wave, S-5     | Australia|
| W-A    | 2       | H-5  | E Wave, S-5     | Australia|
| S-V    | 4       | H-3  | ARRITE        | Saipan    |
| C-J    | 0       |      | No signal       | Hawaii    |
| C-G    | 1       |      | No signal       | Hawaii    |
| D-K    | 2       | L-2  | E Wave, S-1     | Majuro    |
| D-L    | 2       | L-3  | E Wave, S-1     | Majuro    |
| R-E    | 2       | L-4  | S-1            | Phoenix   |
| R-F    | 2       | L-5  | S-1            | Phoenix   |

(N) SOUND GEAR AND SOUND CONDITIONS.

No major difficulties or derangements were encountered with the sound gear. The maximum range obtained on the JF was 36,000 yards on a large tanker. Sound conditions were ideal at the time, there being a conveyance of a negative layer from the surface and a positive layer from below right at the JF depth. Finging was detected by the supersonic gear from the escorts of the Tanker at a range of about 30,000 yards, 17.5 KCS.

(O) DENSITY LAYERS.

| DATE  | TIME   | POSITION | REMARKS |
|-------||||
| 2/9/45 | 1430 (H) | 28-37 S. 112-39 E. | Isothermal to 120 feet, 20 negative gradient from 120 to 180 feet, Isothermal from 180 to 300 feet. |
| 2/20/45 | 0730 (H) | 10-34 N. 110-46 E. | Isothermal to 180 feet, 90 negative gradient from 180 to 300 feet. |
| 3/23/45 | 1130 (H) | 14-50 N. 111-13 E. | Isothermal to 40 feet, 10 negative gradient from 40 to 140 feet, 110 negative gradient from 140 to 205 feet, 40 negative gradient from 205 to 325 feet. |

— page 240 —
U.S.S. CAVALLIA - Report of Fourth War Patrol.

(F)  HEALTH, FOOD AND TRAINING.

The health of the crew has been excellent, there being only two admissions to the sick list, one for acute cellulitis left foot, and the other urethritis. Three men were treated for scabies with good results, and there were the average number of common ailments and cormbinations. The food situation was fair, but a more varied supply of meats would sure have been appreciated. By the end of the patrol we were all getting sick of the sight of pork. An attempt was made the last refit to install a booster blower in the Control Room to improve habitability forward. However, due to the excessive noise and vibration which was created, the blower was not installed. The habitability of the boat forward is still not satisfactory.

(Q)  PERSONNEL.

The performance of duty of all hands was excellent. The manner in which the new men step so readily into the organization is very gratifying, and speaks very highly of the training received at the Submarine School, in the Relief Crews, and aboard the Tenders. The caliber and training of the new men today is much superior to that of a year ago.

(1) Number of men on board during patrol 73
(2) Number of men qualified at start of patrol 54
(3) Number of men qualified at end of patrol 58
(4) Number of unqualified men making their first patrol 15
(5) Number of men advanced in rating during patrol 12

(R)  MILES STRAUSS - FULL USED.

| Miles Steamed | Fuel Used |
|||
| 1600           | 20,248     |
| 6671           | 55,272     |
| 580            | 6,200      |

(S)  DURATION.

| Days enroute to Area (from Fremantle) | 6 |
| Days enroute to Base (Subic Bay) | 2 |
| Days submarrched          | 12 |

— page 241 —
13 February - At 12-58 S, long 114-53 R the crew was seriously affected for about 25 minutes, and moved up and down so rapidly that rips would have been obvious. No distinct signals were seen, and neither radio nor radar detector could pick up any signals.

(b) 13 February - At 12-12 S, long 115-04 R the same effect was noted, which lasted for one hour.

(c) 10 March - At 15-10 R, long 109-08 R, the same effect was noted, and it looked like jamming from a radio transmitter. A plane was contacted at this time to 18 miles closing, and it did not answer. At 14 miles it became impossible to pick up contact due to the interference, so

(V) REMARKS.

Commander Submarine Services Seventh Fleet Confidential Letter, serial 0243, dated 2 February 1945, has been read by 11 officers attached to this ship, and paragraph (4) complied with.

— page 244 —
11 April 1945
Serial 0643
C-O-N-F-I-D-E-N-T-I-A-L
USS CAVALLI Conf. Ltr.
AL6-3, Serial 010, dated
25 March, 1945. Report
of Fourth War Patrol.

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

Subject: U.S.S. CAVALLI (33244) - Report of Fourth War Patrol, Comment on.

1. The Fourth War Patrol of the CAVALLI, under the command of Commander H. J. KOSSLETT, U.S.N., was conducted off the coast of INDOC-HINA. The Commanding Officer was OTC of a Coordinated Group consisting of CAVALLI, LOS and HELMERUD.

2. Only two contacts worthy of torpedo attack were encountered, and neither contact could be closed for attack. Several small native craft were investigated and judged to be engaged in innocent traffic; and were not molested. On 18 March the Officer of the Dock, Lieutenant A. G. RAND, Jnr., U.S.N., sighted an enemy torpedo approaching and manoeuvred to avoid in a most commendable manner. The precision of execution of correct evasive tactics in this instance indicates a well trained organisation.

3. C.V.LLL performed extensive lifesaving services, but had no occasion for rescue of aviation personnel. Considerable success with submarine-aircraft communication was achieved during this patrol.

4. The award of the Submarine Combat Insignia is not authorized for this patrol.

5. The Force Commander congratulates CAVALLI, her Commanding Officer, Officers and Crew upon the recent award of the Pre-idential Unit Citation, and upon the successful completion of a long and arduous patrol. There was a paucity of worthwhile enemy contacts on this patrol, but the Force Commander is confident that this aggressive and well-trained ship will always give a good account of herself in any and all encounters with the enemy.

Eliot H. BERNARD
Chief of Staff, ORIGINAL COPY

— page 245 —
1/4/45
TE24-71/A16-3
UNITED STATES NAVY
Serial 0643
11 April 1945
C-O-M-E-I-D-E-N-T-I-A-L
COUNTLIN
SECOND ENDORSEMENT to:
USS CAVALLA Conf. Ltr.
A16-3, Serial 010, dated
25 March, 1945. Report
of Fourth War Patrol.

Subject: U.S.S. CAVALLA (33244) - Report of Fourth War Patrol, Comment on.

Distributions:
Cominch (3) Direct ComSubRon-22 (2)
Vice Opnav (2) Direct ComSubRon-26 (2)
Vice Opnav Op-23c (1) ComSubRon-30 (2)
ConlstFlt (1) DivComSubRon-18 (1 ea)
Con2ndFlt (1) DivComSubRon-22 (1 ea)
Com7thFlt (2) DivComSubRon-26 (1 ea)
ComSublstFlt (30) DivComSubRon-30 (1 ea)
ComSub2ndFlt (4) S/M School, N.L. Conn. (2)
CTF-71 (7) Comdt. NYD, Puget Sound. (1)
CTG-71.5 (2) SubAd, Mare Island. (2)
CTG-71.8 (2) S/Ms 7thFlt (1)
ComSubRon-18 (2)

J. B. MILLER,
Flag Secretary.

THIS REPORT WILL BE DESTROYED PRIOR TO ENTRY INTO ENEMY CONTROLLED MATERS.

— page 246 —
1/1
Rth
Wds.
2
Wht 1943

UNITED STATES PATROL
COMMANDER SEVENTH FLEET

A16-3(8) (F-3-o/whr)
Serial 01864

CONFIDENTIAL
FIRST ENDORSEMENT on:
USS CAVALIA Conf. I.t.r.
A16-3, Serial 010, dated
25 March 1945.

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

Subject: U.S.S. CAVALIA (SS344) - Report of Fourth War Patrol.

1. Forwarded.

J. H. LONG
By direction

— page 247 —
38244/A16-3 U.S.S. CAVALLA (SS244)

BEGAN:
From: The Commander in Chief, United States Fleet.
To: The Commander Submarine Squadron THINNY.
Vic.: (1) The Commander Submarine Squadron THINNY.
       (2) The Commander Submarine Squadron THINNY.
       (3) The Commander SUBMACHINE FLEET.

Subject: U.S.S. CAVALLA (SS244), Report of "ar Patrol
Number Five.

Inclosure: (1) Subject Report.
       (2) Track Chart (Consubs 7th Fleet).

1. Inclosure (1), covering the fifth ww patrol of this vessel conducted in the South China Sea and Jervis Sea Area during the period 20 April 1945 to 27 May 1945, is forwarded herewith.

H. J. LOBEL

DECLASSIFIED ART. 0445, OPNAVINST 5510.10
BY: 00-2025, DATE: 5/25/72

DECLASSIFIED

— page 248 —
25 March 1945, for normal refit by the U.S.S. HOWARD W. GLIMORE and Submarine Division 221 Relief Crew, under the acting command of Commander C. R. Donahoe, U.S.N. Due to heavy schedule for drydock, no drydocking could be arranged for this vessel, all underwater work being performed by divers. The following major work items were accomplished during the refit:

(1) Installed new coils and heaters and rewired both vapor compression stills.

(2) Completely overhauled auxiliary engine.

(3) Partial overhaul of #3, and routine overhaul of #1, 2 and 4 main engines.

(4) Installed new attached salt water pump on #1 main engine.

(5) Renewed bearings on hydraulic pump motor to reduce noise level.

(6) Renewed bearings and balanced impeller of hull ventilation exhaust blower to reduce noise level.

(7) Renewed bearings in #2 lighting motor generator to reduce noise level.

(8) Replaced one battery water Ion Exchanger in each battery well.

(9) Installed new VHF antenna with tapered base.

(10) Installed new APR antenna to make reception on all frequencies uniform strength.

(11) Installed remote TEL-12 modulator unit in conning tower.

(12) Replaced worn drive gears for JP training to eliminate play.

(13) Completely overhauled pitometer log and the auxiliary gyro compass.

— page 249 —
14) Replaced #2 periscope.

(15) Installed positive acting interlock on coming tower hatch.

Lieutenant Thomas B. Denegre, DE, U.S.N.R., was detached and ordered to duty as Submarine Division 222 Engineer. Lieutenant (jg) Vance L. Cachcy, DA, U.S.N.R., was detached and ordered to Submarine Division-221 for duty. Lieutenant (jg) Robert W. Purdie, (EL), U.S.N.R., reported aboard for duty from Submarine Division 222 Relief Crew. Ensign Thomas P. Mainzinger, (DL), U.S.N.R., and Ensign Ray H. Nichols, U.S.N.R., reported aboard for duty from Submarine Division 221 Relief Crew.

Underway for training exercises 11-17 April. Various type exercise runs were made, all guns tested fired, no torpedoes fired. Loading was accomplished 17-18 April. Reduces for sea 19 April 1945, but departure was delayed 18 hours due to shortage of escorts.

(B) NARRATIVE

Following is the list of officers and chief petty officers attached to this vessel, with total number of patrols made, including the fifth patrol of this vessel just commencing:

| Name | Rate | No. Patrols |
|------|------||
| Kessler, Herman J. | Commander, U.S.N. | 9 |
| Eberle, Edward R. | Lieutenant, U.S.N.R. | 5 |
| Rand, Arthur G., Jr. | Lieutenant, U.S.N. | 5 |
| Page, Edward C., Jr. | Lieutenant, U.S.N.R. | 4 |
| Purdie, Robert | Lieutenant, U.S.N.R. | 1 |
| Zellmer, Ernest J. | Lieutenant, U.S.N. | 5 |
| Honza, Donald W. | Lieutenant, U.S.N.R. | 2 |
| Koehne, Edward J., Jr. | Ensign, U.S.N. | 12 |
| Mainzinger, Thomas P. | Ensign, U.S.N.R. | 1 |
| Nichols, Ray H. | Ensign, U.S.N. | 2 |
| Ryan, Lloyd E. | CMC (A) (T), U.S.N. | 5 |
| Vert, Woodrow W. | CMC (A) (T), U.S.N. | 8 |
| Malco, Marion I. | CMC (A) (T), U.S.N. | 5 |
| Walker, Robert F. | CMC (A) (T), U.S.N. | 11 |
| Lee, James R. | CMC (A) (T), U.S.N. | 5 |
| Mandelbaum, Kermit | CMC (A) (T), U.S.N.R. | 5 |

— page 250 —
21 April 1945

| Name | Rate | No. Patrols |
|------|------||
| Holt, Ray B. | CHR(A), U.S.N. | 7 |
| Lopez, James E. | CHR(A)(T), U.S.N.R. | 5 |
| Chandler, Raymond L. | CPH(A)(T), U.S.N. | 5 |

20 April 1945

0148(I) Underway from nest alongside U.S.S. HOWARD W. GILMORE, Subic Bay, P.I., Stood out channel in company with U.S.S. BAY in accordance with CTG 71.1. Secret Operation Order 54-45, escorted by U.S.S. GEORGE E. DAVIS.

0243 (I) Clored net at entrance to harbor and took station on port quarter of escort, BAY to starboard.

0705 (I) Sighted and exchanged signals with U.S.S. CHARR. Escort left to join up with CHARR. Thanked escort for his services, and then proceeded on our way in company with U.S.S. BAY.

0900 (I) For remainder of morning conducted practice approaches with U.S.S. BAY, and made training dives. Sped input to the TDC was found erratic, and the trouble found and remodied later. Sighted two PEM's during morning, both of whom gave us a close looking over.

1200 (I) Position, 14 - 41N, 118 - 27E

1300 (I) Conducted training dives and deep dive during afternoon. Sighted and exchanged recognition signals with a PFY.

1535 (I) Received patrol instructions from CTF-71.

1930 (I) BAY conducted and around and radar attack on us, following which, BAY acted as target while we made an attack.

21 April 1945

0800 (I) Sighted and exchanged signals with the U.S.S. GIBLIN.

— page 251 —
0900 (I) Bid adieu to BAYA, and told them we were part-
ing company and heading for our area.

0922 (I) Sighted and exchanged signals with the U.S.S.
CROAKER.

0930 (I) Passed through "Maxi" and departed safety lane.

1200 (I) Position, 14 - 45N, 113 - 30E. During the after-
noon had a long conversation with a PSM who was
quite bewildered at sighting so many submarines
in this vicinity. Communications were excellent,
and we soon straightened him out. Before depart-
ing to continue his patrol, he very kindly offer-
ed his services to us.

22 April 1945

0300 (I) Entered patrol area C-2.

0435 (I) Received instructions from CTF-71 to be on
station off Cape Batangan tomorrow morning for
lifeguard duty.

0738 (I) Submerged 40 miles bearing 080° from Kulao Rai
Island. 'Since my presence is unknown in this
area yet, decided to make this all day dive in
the vicinity of the spot where I had a torpedo
fired at me during the last patrol. I have a
little debt to repay here, and hope I get the
opportunity.

1200 (I) Position, 15 - 33N, 109 - 35E.

2015 (I) Surfaced 20 miles off Culea Rai Island. Nothing
sighted during day.

2147 (I) Received message from CTF-71 telling me to notify
one of my men about the death of his father. We
have no person attached with this name, and will
so notify CTF-71 on my first transmission.

23 April 1945

0230 (I) On station in vicinity Cape Batangan for life
to guard duty. Nothing heard during this period and
nothing contacted except for one momentary "SD"
contact at 31 miles which quickly faded out.

- 4 -

— page 252 —
0743 (I) Set course to northward to make surface patrol northern part of area.

: 0753 (I) Sighted and picked up by radar an unidentified plane; range 14 miles. Unable to contact by radio, and no answer to IFF. For remainder of morning attempted over half hour to contact our sector plane by radio, but was unsuccessful.

: 1200 (I) Position, 16 - 04N, 109 - 25E.

: 1529 (I) Sighted nine small sailing vessels, two of which we went alongside and investigated. Both appeared to be manned by Chinese, and apparently only interested in fishing. No other shipping sighted during the day.

: 1718 (I)

— page 253 —
1048 (I) Radar picked up plane, range 22 miles, which steadily closed us, and was sighted by the OOD at 12 miles. When radar range was ten miles, and plane still closing with zero angle on the bow, it looked like a small single engine land plane. Although we were receiving an IFF response, we were unable to raise plane by radio.

1953 (I) Submerged. Range to plane 10 miles, angle on bow still zero. While diving, the upper conning tower which jammed in a partially open position when the "positive" acting interlock mechanism buckled between hatch gasket and seat. Checked dive at 45 feet, and with water pouring into conning tower, decided to surface and fight it out rather than flood conning tower.

1055 (I) Surfaced and went immediately to four engine speed: Plane was sighted, range 6 miles by radar, and was identified as a PB4Y, with many slags of roller. We then discovered as it closed us that radar ranges were about 4 miles in error, the plane actually being a PB4Y. This plane, plus other out that radar indicated. That fact, plus poor visibility, was the reason for the OOD thinking it was a "smell plane. The plane passed directly overhead, after which we raised him by radio. He had nothing to offer, and said he knew he had passed directly over us. The plane was heading in direction of Heinen. Posit, 17 - 16N, 110 - 46E.

1110 (I) Submerged to install old gravity type interlock on Conning tower hatch in place of the positive interlock, which had been removed and found damaged beyond repair.

1200 (I) Position, 17 - 20N, 110 - 49E.

1238 (I) Surfaced and proceeded towards new station.

1753 (I) Posit, 18 - 14N, 111 - 36E. Radar contacted plane at 10 miles, which answered IFF, closed to 6 miles, then opened out and disappeared from screen at 22 miles. Not sighted from bridge, and unable to contact by radio.

— page 254 —
2110 (I) Sent message to BULIHAD telling them when we would arrive on station, and requesting information on area.

: 2142 (I) Radar detector picked up sweeping interference on 105 meccas, which lasted about four hours, and is believed located on northeast Hainan.

: 2344 (I) Received very discouraging report from BULIHAD on area to which we are heading: they had been there 26 days, no ship contacts, many junk and floating mines, and had been bombed both by day and night radar planes.

: 26 April 1945

: 1025 (I) Position 20 - 49N, 113 - 33E. Radar picked up plane at 15 miles, which answered IFV, but was unable to contact by radio. Then contact closed to six miles it turned out to be twenty E-24's or B-25's heading north.

: 1200 (I) Position, 21 - 08N, 113 - 42E.

: 1218 (I) Received information from BULIHAD about lifeguard duty, and a request that we relieve them so they could depart area.

: 1309 (I) Entered area and told BULIHAD we would relieve her.

: 1557 (I) Sighted motor type mine draft, distant about 1500 yards on the beam. Mine was quickly lost due to poor visibility and choppy seas, so did not turn back to investigate. Sighted ten sailing junks during afternoon, two of which we tracked in a rain squall for about half an hour before identifying. They are very annoying, because radar will hold some of them out to six miles.

— page 255 —
1633 (I) Received message from BLENNY telling of 30 ship convoy sighted by plane, which she was entering our area to search for. We have been in vicinity of the reported convoy position all afternoon and have soon nothing nor picked up anything with radar. BULLHEAD was in this vicinity all morning and early afternoon. Think plane has made a mistake, but set course to close beach and take another look.

1920 (I) On edge of blind bombing zone, land distant about 10 miles, so reversed course. No contacts, but detector picking up strong interference on 160 megacyclos.

1945 (I) Received message from CTF-71 concerning plane 30 ship contact, and CTF-71 considered it questionable. Me too.

2006 (I) Picked up weak interference from BLENNY radar. Advised BLENNY we had no contacts and wore opening out from land. Interference from land based radar remained until about midnight. Nice sailing boats were picked up during the evening.

27 April 1945

Weather still bad, sky completely overcast, very rough seas, and intermittent heavy rain squalls.

0812 (I) Having closed land to obtain radar fix, our position was found to be 21 - 47N, 114 - 24E, very close to our estimated position. Changed course to open out from land. Sighted three sailing junks during the morning.

0825 (I) Sighted PB4Y, range about 8 miles, but was unable to contact by radio. We could hear him calling, but it was very weak.

0850 (I) Electrical fire in the forward engine room, which was brought under control in 2 minutes. It was in the auxiliary power fuse panel, and was caused when an Elctorian replacing a fuse lost his balance due to heavy rolling of ship, and accidentally shorted out the adjacent fuse clip. It took six hours to repair the damage, during which time the hull ventillation had to be secured. (See major defects and damage).

- 8 -

— page 256 —
1200 (I) - Position, 21 - 06N, 114 - 30E.
1930 (I) - Again closed land to obtain fix, then opened out to get clear of the 160 megacycle radar which is mighty strong in close to beach.
2218 (I) - Received message from CTF-71 assigning lifeguard station every night until 6 May.
2222 (I) - Radar contact, range 14 and 16 miles, no answer to IFF, unable to contact by radio.
2224 (I) - Submerged, with range to close to

— page 257 —
1200 (I)    Position, 21 - 42N, 114 - 13E.
: 1546 (I)    Surfaced and headed toward liferaud station, where I have to be every night from twenty hundred to twenty four hundred until 6 May.
: 1823 (I)    Exercise at "Captain to the bridge" drill, when the officer of the deck sichtac a poris-cope which turned out to be a stick.
: 2221 (I)    Rader detector picked up sweeping interference on 300 messages.
: 2248 (I)    Three plane contacts were picked up by radar, varying in range from 10 to 14 miles. All contacts eventually disappeared from screen at 20 miles. Much conversation could be heard between planes, but we were unable to contact any by radio and none answered IFF.

29 April 1945

Weather clearing, sea beginning to moderate.

0230 (I)    Obtained first star fix in three days.
0850 (I)    Radar detector picked up sweeping interference on 80 and 300 messages.
0950 (I)    Lost all IC power, which was found to be caused by a defective fuse in the DC supply. During the fifteen minutes required to find the trouble end remedy it, we had no radar, no gyro, no rudder angle indicator, and even the magnetic compass went haywire as soon as the gyro circuit was deenergized.
1004 (I)    Ship and Commanding Officer back to normal.
1006 (I)    Radar picked up plane at 6 miles, which was sighted from bridge at 6 miles, closing. There was no answer to IFF, and we were unable to contact by radio. It was single tailed and looked like a P-4Y-2, but we weren't positive of this.
1008 (I)    Submerged. Range to plane 5 miles, still closing, and no answer to IFF.

- 10 -

— page 258 —
1115 (I)    Surface.

1122 (I)    Radar detector picked up interference on 160 megacycles.

1200 (I)    Position, 21 - 11N, 114 - 31 E.

1441 (I)    Received information from CTF-71 on rendezvous point with GAFILAN.

2022 (I)    Told GAFILAN we would rendezvous at time and date they designated, and three hours later received word to rendezvous towarow morning.

2226 (I)    Radar picked up six planes distant 18 to 28 miles, all of which opened out and disappeared from screen. Probably our B-29 friends, although we received no IFF and were unable to contact by radio.

2240 (I)    Radar picked up two planes, range 65 miles, closing. No IFF response and unable to contact by radio.

2242 (I)    Submerged, with range to closest plane 4 miles, and still unidentified.

2302 (I)    Surface. Once plane on radar at 14 miles, which opened out and disappeared from screen.

2344 (I)    Radar interference which had been sweeping us all evening disappeared.

30 April 1945

Sky completely overcast most of the day, no morning or evening stars.

— page 259 —
0900 (I) Made rendezvous with U.S.S. CASILIAN and received official and personal mail, which was much appreciated, and a mighty big morale booster.

: 1100 (I) Picked up radar interference on 120 messages.

: 1200 (I) Position, 21 - 43N, 115 - 00E.

: 1257 (I) Radar contact on plane at 26 miles, which opened cut and disappeared from screen at 45 miles. Received IFF response, but unable to react by radio.

: 2025 (I) Radar detector picked up the usual sweeping radars which we have had every night, 80, 160 and 300 messages.

: 2056 (I) Position, 21 - 33N, 114 - 56E. For the second night in a row in this vicinity, the 3-J radar has picked up many contacts, varying in range from 500 to 1000 yards. Nothing could be seen from surface. Last night we decided it was wave chaos, although the sea was fairly calm. However, tonight it occurred again in almost the exactly same spot. Maybe there are tide rips or some atmospheric condition in this vicinity causing the phenomena, but nevertheless, it is very puzzling. The contacts were good solid pips, and they were only picked up in this vicinity.

: 2201 (I) Sent our message #1 to CTF-71.

: 2218 (I) Radar contact 21 miles, closing. No answer to IFF, and unable to contact by radio.

: 2224 (I) Submerged. Range to plane 5 miles, still closing.

: 2246 (I) Surfaced.

: 2350 (I) Radar contact on plane at 13 miles, which opened out to 18 miles and disappeared from screen. Unable to contact by radio and no answer to IFF.

— page 260 —
1 May 1945

Sky completely overcast most of the day, sea calm.

0810 (I) Submerged for periscope patrol vicinity blind bombing zone. This lifeguard duty every night prevents an all day submerged patrol near blind bombing zone, because we are supposed to be on lifeguard station at 2000. Sighted 11 junks during morning. Number two periscope, which has been giving trouble all patrol, still bad. We have to recharge it every three days.

1200 (I) Position, 21 - 46N, 114 - 24E.

1215 (I) Commenced heading out from land in direction lifeguard station.

2057 (I) Pickled up sweeping radar interference on 160 megacycles.

2124 (I) Received message from CTF-71 giving new area assignment in Java Sea after being relieved by Scallion & out 3 May. It also told us to proceed to Fremantle for raft in 23 May, which brought forth a mighty cheer throughout the boat when this word was passed.

2228 (I) Radar contact on plane, range 8 miles, no answer to IFF, unable to contact by radio.

2230 (I) Submerged. Range to plane 5 miles, still no answer to IFF.

2301 (I) Surfaced and resumed lifeguard duty.

2 May 1945

Sky overcast, heavy seas, end intermittent rain squalls.

1200 (I) Position, 21 - 17N, 114 - 03E.

— page 261 —
1525 (I) Radar contact on plane at 12 miles, which opened out to 14 and disappeared from screen. No answer to IFF and unable to contact by radio.

2000 (I) Detector began picking up our usual night sweeping radars.

2120 (I) Radar 'picked up three planes at 26, 28 and 30 miles, which disappeared shortly from screen without answering IFF or our radio call.

2132 (I) Radar picked up many planes from 9 to 26 miles. Most of the planes answered IFF, but we were unable to contact any by radio.

2226 (I) Radar picked up many planes from 9 to 26 miles. Most of the planes answered IFF, but we were unable to contact any by radio.

3 May 1945

0353 (I) Received message from CTF-71 saying SEALION would rendezvous with us and transfer mail before we departed station.

0621 (I) Commenced closing lend to obtain radar fix.

0913 (I) Obtained fix, and changed course to open out from lend. For the last twenty minutes the sweeping radar located on the beach has been steady on us, and besides, we are probably visible from beach, so decided to dive for a few hours and get clear.

0922 (I) Submerged, lat 21 - 46N, 114 - 32.

1200 (I) Position, 21 - 39N, 114 - 31.

1330 (I) Surfaced and headed towards lifeguard station.

1536 (I) Sighted and avoided two sailboats.

1615 (I) Notified SALIUN by radio that we would rendezvous at time they designated.

— page 262 —
1854 (I) As we had received no reply from SMILTON, sent interrogatory on time of rendezvous.

1951 (I) Received message from SMILTON setting time of rendezvous tomorrow morning.

1957 (I) Investigated a sail boat which we were unable to avoid because it was sitting right on our lifesaver station. There were several women and children on board, and they appeared very friendly, waving wildly to us as we went by.

2010 (I) A very pretty yellow canary landed on the shoulder of Ensign Mainzinger, the junior officer of the deck, and a beautiful friendship sprang up. The third refused to eat the bread brought to the bridge for him (or her), but went to sleep on the railing near his new found friend.

2224 (I) Radar picked up contacts on several planes, range 9 to 22 miles. No answer to IFF from any of them, and unable to raise by radio.

2229 (I) Submarines, Range to closest plane 5 miles, still closing, and no answer IFF.

2254 (I) Surfaced and resumed lifesaver duty. Our canary has disappeared. Hope he woke up before we went under.

4 May 1945

"Clear skies and calm sea for a change.

0300 (I) 5. Ht'd light on sailboat, and SJ picked it up range 10,000 yards.

0330 (I) SJ picked up contact dead ahead, range 1600 yards, which we maneuvered to avoid and passed 300 yards aboard. Although moon was bright and visibility excellent, nothing was sighted from bridge. Believe this contact was just another gray heir grower.

0414 (I) SD and SJ both picked up plane contact, range 5 miles, closing fast. As has been our practice every night, at the time SD as being keyed every minute, SJ every three minutes.

- 15 -

— page 263 —
0415 (I) Submerged.
0452 (I) Came to 50 feet and raised SD mast. Radar contacted plane, range 2 miles, which closed to 2 miles in a very few seconds. Flooded negative and went back down. This baby has us pretty well spotted.
05K3 (I) Came to 45 feet and cut in SD and SJ. All clear. Surfaced and headed towards rendezvous.
0639 (I) Sighted SEALION and closed them. Received 'back of official and personal mail from SEALION, which was much appreciated, and sent letter over to them giving all the information I had on the area.
0725 (I) Bid adieu to SEALION, departed area, and set course for now area assignment in Java Sea. SD out of commission for about half hour while making repairs.
1200 (I) Position, 20 - 31N, 114 - 35E. No contacts during remainder of day.

5 May 1945

Sky completely overcast, intermittent rain squalls.
0718 (I) Hydraulic plant out of commission. (Sea major defects and damage). Ventilated inboard, and stationed man throughout the boat to dive by hand if we are forced down.
0749 (I) Hydraulic plant in commission, went back to normal running.
1200 (I) Position, 17 - 25N, 111 - 14E.
1242 (I) Radar contact on plane, range 26 miles. No answer to IFF and unable to contact by radio. Plane disappeared from screen at 28 miles.

16

— page 264 —
1440 (I) Lookout reported sighting a possible red flare bearing 1400T, lat 16 - 56N long 110 - 56Z. This was not sighted by anyone else on bridge. Nevertheless, spent almost two hours searching in that direction, with no luck.

2040 (I) SJ radar out of commission. Sent message to all subs giving my position, and informing them we were heading south with radar out of commission.

2055 (I) Radar detector picked up sweeping interference on 200 megacycles, which appears to be increasing in strength, and is being keyed.

2135 (I) Reversed course.

2145 (I) SJ radar back in commission. Came back to base course, the interference appearing to be coming from this bearing. However, in a very few minutes it was lost, and never picked up again.

2200 (I) Sent message reporting radar back in commission.

2243 (I) Radar detector picked up weak sweeping interference on 300 megacycles, which appeared to be keyed every minute. The interference disappeared in about an hour.

6 May 1945

See calm, sky clear.

1014 (I) A very low, wave hopping plane, was sighted from bridge, range about 7 miles, coming right for us. Not picked up by radar. It looked like a "Mavis". Posit, 13 - 56N, 111 - 23E.

1015 (I) Submerged.

1137 (I) Surfaced, all clear.

1200 (I) Position, 13 - 46N, 111 - 22E.

— page 265 —
1223 (I) Sent our message #2 to CTF-71 and reported our battery trouble. During the last refit the relief crew attempted to put in an Equalizing charge, which was not completed due to reaching the high temperature limit. Since that time we have not been able to put a complete charge in the battery without hitting the high temperature limit. We have tried everything we can think of to bring the temperature down. Maybe CTF-71 has some better ideas.

2100 (I) Put men out on deck to convert #4 RET to a MET.

2310 (I) Conversion completed.

2330 (I) Saturated to flush out #4 MET.

2353 (I) Surface. Later on put two men on deck to grease topside.

7 May 1945

Sea calm, sky alightly overcast.

0039 (I) Received reply to our despatch from CTF-71.

1200 (I) Position, 9 - 45N, 110 - 31E.

1625 (I) Radar contact on plane at 27 miles, which opened out to 32 miles end disappeared from screen. Plane answered IFF, but we were unable to contact it by radio. Position, 9 - 00N, 109 - 52E.

2019 (I) Received massive from CTF-71 telling us to remain in area D-2, as he had a job in northern part of area. For us in about six days. He came now in area D-2. Decided to work to the southern part of the area, and keep clear of the northern part until we find out just what that job is.

8 May 1945

Sky overcast, fairly heavy, and intermittent thunder and lightning storms all day.

— page 266 —
1116 (I) Radar contact on plane at 26 miles, which closed to 25 miles, and then faded from screen. No answer to IFF and unable to contact by radio.

: 1200 (I) Position, 6 - 45N, 107 - 37E.

: 1300 (I) Detector picked up interference on 120 megacycles.

: 1306 (I) Radar contact on plane, range 25 miles, closing fast, answering the IFF.

: 1312 (I) Range to plane 10 miles, still answering IFF, but unable to contact by radio. Not sighted from bridge. Still have interference on 120 megacycles, which makes me a little suspicious of plane, even though this is not supposed to be aircraft radar frequency.

: 1313 (I) Submerged, range to plane 9 miles, and he is coming in either on his or my radar. Did not sight plane before diving. Position, 6 - 39N, 107 - 24T.

: 1552 (I) Surfaced. Headed eastward trying to run down a break in the clouds. Sky completely overcast.

: 2037 (I) Detector picked up weak sweeping interference on 120 megacycles. The interference seemed to increase in strength for a while, and the frequency changed to 140 megacycles before it was finally lost.

9 May 1945

Sky completely overcast, intermittent rain squalls, heavy seas.

1150 (I) Received orders from CTF-71 to proceed to previously assigned area in Java Sea. The job which was in line for us did not materialize.

1200 (I) Position, 6 - 57N, 106 - 43E.

— page 267 —
1216 (I) - Submerged, in order to better time my passage by Tunbelsen Islands, and to save fuel, which is used pretty fast at two-o'clock speed. My policy this patrol to date, is two cruises during daylight hours, one at night.

1550 (I) - Surfaced.

2210 (I) - Picked up interference of another J, which turned out to be the BLOCKer heading North. Exchanged recognition signals, and shot the breeze with "Soupy" Campbell for about half hour.

10 May 1945

Sky partially overcast, moderate sea.

0845 (I) - Sighted Solar Island off Great Patum.

1158 (I) - Sighted North Haycock Island.

1200 (I) - Position, 3 - 28N, 107 - 13E.

1306 (I) - Sighted Low Island.

1519 (I) - Radar contact on plane 22 miles, which was sighted from bridge bearing North on Easterly course. Plane answered I.T., but we were unable to contact it by radio. Disappeared from screen and sighted at 29 miles.

1914 (I) - Sighted small island not avoided.

2121 (I) - J radar picked up Radio Island bearing 1880, range 20 miles. Course changed to westward of Saddle Island, Campbell's Jump and S.1

— page 268 —
0726 (I) Sighted St. Barbe Island bearing 0900T, range 31 miles; which we passed at 26 miles to fix position, and then proceeded on our way.

: 0826 (I) Crossed the Equator at 106 - 48E, deeply regretting complete absence of lowly pollywogs.

: 1200 (I) Position, 0 - 35S, 107 - 13E.

: 1937 (I) Karimata and Serutu Islands in sight through a light haze, bearing 0800T, range about 34 miles. Reversed course in order to make undetected approach and transit of Strait.

: 2005 (I) Reversed course to head back for Strait, and went to four engine speed.

: 2222 (I) Passed Serutu Island abeam to port, and commenced uneventful passage through Karimata Strait; several lights were seen on Serutu Island, some steady, others apparently blinking. Much lightning and thunder, with intermittent heavy rain squalls, was encountered during the transit.

12 May 1945

: 0600 (I) Overcast sky, heavy seas.

: 0724 (I) Completed passage of Karimata Strait.

: 1053 (I) Sighted and avoided a small sailboat.

: 1200 (I) Entered assigned area E-9.

: 1412 (I) Submerged and conducted periscope patrol.

: 1852 (I) Surfaed, and continued patrol to "fastward."

13 May 1945

: 0812 (I) Sky slightly overcast, sea moderate.

: Submerged for day periscope patrol. Due to fuel shortage will be forced to make several submerged patrols.

— page 269 —
1200 (I) Position, 4 - 445, 112 - 215.
: 1916 (I) Surfaced. Nothing sighted during day.
: 2020 (I) As we are still being troubled by high battery temperatures, decided to try one more method of bringing down the temperature by taking advantage of a night which was calm, cool and clear. Lashed open all T doors and air lock doors; opened the forward torpedo room upper hatch, closed the commin' tower lower hatch, closed the engine and hull inductions, and commenced a suction through the boat with three main engines.

: 2050 (I) Secured suction through boat. Am hoping we can put in a normal charge tonight without reaching limiting temperature.

: 2357 (I) Received word from TAY that she is departing area tonight for Perth, and later learned with pleasure of her success in the area immediately south of us.

: 14 May 1945
: Sky overcast, seas moderate. Main research limiting temperature on battery charge 1.5 night.
: 0902 (I) Submerged for day periscope patrol.
: 1200 (I) Position, 4 - 495, 113 - 03E.
: 1917 (I) Surfaced. Nothing sighted during day.
: 2253 (I) Received orders from CTF-71 to depart present area and patrol area E-8.

: 15 May 1945
: Sky overcast, sea moderate.
: Recivcd orders from CTF-71 to return to area Z-9 for lifeguard duty tomorrow.
: 0530 (I) Submerged for day periscope patrol.
: 0821 (I)

— page 270 —
1200 (I) Position, 4 - 56S, 111 - 47E.
: 1917 (I) Surfaceed. Nothing sighted during day.
: 2019 (I) Received orders from CTF-71 cancelling life-guard duty, and telling us to proceed to area E-8.

16 May 1945

Sky overcast, sea moderate.

0710 (I) Sighted and avoided a sailboat.

1121 (I) Radar contact on plane, 12 miles, no answer to IFF and unable to contact by radio. Not sighted from bridge. Plane closed to 111 miles, then disappeared from screen, indicating to me either a small or a low flying plane. Sky completely overcast making it tough to spot a plane. Decided to dive now, rather than wait for possible closer contact, due to the poor operation of the Conning Tower hatch. (See Major Defects end Damage).

1125 (I) Submerged.

1200 (I) Position, 5 - 41S, 111 - 52E.

1553 (I) Surfaceed and continued patrol to Eastward. Nothing further sighted during day.

17 May 1945

Sky completely overcast, sea calm.

0750 (I) Fawcairn Island in sight bearing 270°T, distant 30 miles.

0839 (I) Sighted small contact on horizon in direction of Bawcairn Island. It looked like a possible gun target, so submerged and changed course to close, in order to make undetected approach.

0945 (I) Target turned out to be a sailboat that did not have sail rigged at time of our sighting it. Changed course to clear, and maintained submerged petrol for remainder of day.

— page 271 —
1200 (I) Position, 5 - 555, 113 - 12E.
: 1918 (I) Surfaced. Nothing further sighted.
: 2023 (I) SJ contact at 4500 yards, which turned out to be a sailboat.
: 2333 (I) SJ contact at 7500 yards, which turned out to be a sailboat.
: 2347 (I) SJ radar had what they thought was a "phantom" pip bearing astern, range 1650 yards. However, the officer of the deck and one of the lookouts thought they saw a dark shape on that bearing. The officer of the deck thought it looked like a patrol boat, so submerged. Nothing could be picked up by sound gear, and I believe it was either a sailboat or a dark cloud. The sky was overcast, with scattered dark clouds in vicinity of horizon. The SJ operator insisted his contact was a "phantom".

18 May 1945

Sky completely overcast, see calm.
: 0030 (I) Surfaced, after first taking a careful sweep with the SJ radar at 45 feet.
: 0108 (I) SJ contact at 7000 yards, which turned out to be a sailboat.
: 0715 (I) Two sailboats in sight. Change course to avoid detection.
: 0742 (I) Sighted Maselombo Island bearing 002°N, range 28 miles. Changed course to close Island.
: 0811 (I) Submerged, and conducted periscope patrol for remainder of day.

— page 272 —
1200 (I) Position, 5 - 55S, 114 - 24E.
: 1927 (I) Surfaced. Nothing sighted during afternoon except several sea boats.
: 2033 (I) Picked up weak SJ interference, bearing 2260T, but it was never strong enough to exchange recognition signals.

19 May 1945

Sky partially overcast, sea calm.

0151 (I) SJ contact at 8000 yards which we tracked for over an hour before finding out it was a sea boat.

0545 (I) Exchanged recognition signals by radar with another U. S. submarine; but was unable to exchange calls. Position, 6 - 17S, 114 - 14E.

0730 (I) Sighted the first of many sea boat signals seen remainder of day.

0738 (I) Submerged for day periscope patrol.

1200 (I) Position, 6 - 13S, 113 - 47E.

1937 (I) Surfaced. No contacts during day except sea boats.

2217 (I) Picked up interference of another SJ, and exchanged recognition signals and calls with U.S.S. BLUEBACK who is moving into this area. Asked BLUEBACK if he had any instructions for me and received negative reply. Told him where we would be patrolling tomorrow, and he said he would patrol to westward of us.

2337 (I) Sighted unidentified contact ahead in moon patch. Slowed, and commenced closing, and sent contact report to BLUEBACK, who was about 3000 yards astern of us.

20 May 1945

Sky overcast, sea calm.

— page 273 —
0001 (I) Radar picked up the contact at 6000 yards, which was identified as sail boat. Channeled course to clear BLUEBACK who has been on our stern all evening, range now 3000 yards.

: 0023 (I) Commenced patrol to eastward to put a little distance between BLUEBACK and me.

: 0650 (I) Rader detector picked up sweeping interference on 110 megacycles, which was soon lost.

: 0713 (I) Submerged for day periscope patrol. Sighted many sailboats during day.

: 1200 (I) Position, 6 - 105, 112 - 27E.

: 1900 (I) Commenced maneuvering to clear a "convoy" of five sailboats. Some of those sailboats I've sighted the last few days look calm suspicious to me.

: 1946 (I) Surfaced.

: 2205 (I) Exchanged recon-mission signals and calls with BLUEBACK.

: 2228 (I) Joined up with BLUEBACK and formed a scouting line to see if we couldn't flush out some Japanese shipping.

: 2309 (I) Received orders from CTF-71 to depart area tonight unless we were on the trail of something hot, because three submarines were taking over my area.

21 May 1945

Sky partially overcast, sea calm.

0140 (I) Received orders from BLUEBACK to carry out CTF-71 orders at our discretion. Headed eastward with plans to make surface patrol today. Vicinity Masalembo Island and Kanger Niel, tomorrow night west of Kanger, and transit Lombok 22 May.

— page 274 —
0800 (I) Sighted first of four sailboats which we attempted without luck to keep out of sight of. Finally, closed and investigated the closest, which appeared to be harmless.

: 0912 (I) Ship contact 1. Sighted mast of ship bearing 1600T, our position 6 - 05S, 114 - 04E. Put contact astern and commenced tracking.

: 0919 (I) Target looked like a DE or Gunboat, angle on the bow about 120°S, making good speed towards Surabaya. Went to four engine speed and commenced an attempt to and round. He had to do a little broken field running to get by the sailboats.

: 0927 (I) Sighted submarine on surface dead chased, not a U. S. sub, and believed at first to be Jap. Reversed course, but he had already sighted us and had begun signalling with his searchlight. In time meeting the target changed course to left, giving an angle on the bow of about 1800, and disappeared in rain squall. Sent contact message out twice to boats in this area, but received no receipt.

: 1006 (I) Sumarine identified definitely as British, so closed and exchanged calls with H.M.S. TERRAPIN. She informed us that she had been damaged and was unable to dive or transmit. We told her we would escort her South, and asked if she needed anything, or would like to send part of her crew over to us. She replied in the negative. We manned the 20mm, 40mm and two 50 caliber machine guns, and procured to assist TERRAPIN in shooting it out with any pl no the night make an appearance. My crew liked this, but I was having a hard time building up enthusiasm. Maximum speed TERRAPIN could make was 14 knots, best sustained speed 12 knots. TERRAPIN took station east and we set out at 12 knots. I considered our best bet was to pass north of Kenggan, and to make passage through Lombok tomorrow night. TERRAPIN reported that her receivers were OK, and that she had received our contact report.

— page 275 —
1200 (I) Position, 6 - 055, 114 - 155.

: 1315 (I) Received message from TRRAPIN that she wanted to go through Kengach Passage east of Coa Goa Island. Was not too much in favor of this route, but it would encircle us to transit Lombok before daylight tomorrow, so we changed course to head that way.

: 1330 (I) Was notified by TRRAPIN that she could now dive in an emergency, and would dive for a plane. After several exchanges of signals hit on a plan that if we were forced down by a plane, to remain on base course at three knots for one hour, then both surface. TRRAPIN had neither sound gear or periscopes.

: 1602 (I) SD contact on pl-nc 12 miles, no answer to IFF, unable to contact by radio. Plane closed to 11 miles, and was sighted astern, but could not be identified. Sent contact report to TRRAPIN. Much to our relief, plane opened out and disappeared from sight and radar ct 16 miles.

: 1626 (I) Sighted Sapudi Island, Goa Goa Island and several small islands stretching to westward.

: 1844 (I) Passed Goa Goa Island about to starboard, distant 3 miles. Set course for Lombok, with TRRAPIN about one mile astern.

22 May 1945

Moon too bright, sea too calm, sky too clear, visibility too good.

: 0130 (I) Altered course 10° to pass a large s-iboat about 3000 yards.

: 0215 (I) Exchanged recognition signals by radar with friendly submarine that passed us about 5 miles about off at-rnce to Lombok. Unble to exchange c-1ls. Notified TRRAPIN of presence of sub.

: 0229 (I) Commenced transit of Lombok at 14 knots.

— page 277 —
24 May 1945
Sky clear, sea moderate.
Exchanged recognition signals and calls by radar with U.S. LAMPREY, who passed us about six miles to starboard. Position, 18 - 46S, 113 - 28E.
Position, 19 - 45S, 113 - 02E.
Set clocks back one hour to zone (-)8 time.

25 May 1945
Sky clear, sea moderate. Attempted equalizing charge, but was forced to secure after two hours due high temperatures.
Position, 24 - 40S, 112 - 40E.
Sent our message /5 to CT-71, giving new TMA Fremantle.

26 May 1945
Sky completely overcast, sea moderate.
Position, 29 - 34S, 113 - 24P.
Radar contact on plane at 19 miles, which answered IFF, and also peeped from screen at 21 miles.

27 May 1945
Sea moderate. Ran through lightning and thunder storm during night.
Shifted Rottnest Island light bearing 148°T, range about 30 miles.
Exchanged recognition signals and calls with Rottnest. Permission was granted to enter port. Set course for safety line and Fremantle.

— page 278 —
U.S. CAVALRY - Report of Fifth Air Patrol.

(C) WATER'R

Many days of overcast skies, with intermittent heavy rains, were encountered during this patrol. The seas, on the whole, were moderate to calm, and we were thankful that for the first time in the CAVALRY's petrol experience we weren't forced to spend a large part of the patrol fighting mountainous seas. The overcast skies would have been troublesome if we hadn't been in spots most of the time where we could obtain radar fixes on lend. For the first time in my experience roderate to heavy seas were encountered in the Java Sea. During our ten days in this area there was not one glassy sea.

(D) TIDAL INFORMATION.

During the period 26 April to 4 May, while patrolling on area off Hong Kong, currents were observed to cause a set to the east and North-west near the Ieme and Keipong Islands, average velocity about one knot. However, when about 40 to 60 miles south of these Islands the current caused a set anywhere from Northeast to Southeast, average velocity about one knot. These observations were hampered by very poor weather conditions which made accurate fixes difficult. While operating in the Java Sea during the month of May, between parallels 110°C and 115°, a consistent westerly set of 0.8 knots was encountered. As this was the southeast monsoon season, the currents experienced were in conformity with information obtained from the Coast Pilot.

(E) NAVIGATION LISTS.

No navigational aids were observed during this patrol. The Loran gear was employed as often as possible during the patrol with fair results, limited by the fact that atmospheric conditions prevented getting good reception of more than one station at any given observation. However, as a check against doubtful navigational fixes taken during unfavorable weather, even single lines of position were of value.

— page 279 —
U.S. CVN 114 - Report of Fifth War Patrol.

(F) SHIP CONTACTS.

Only one contact, other than seilboc, was made during this patrol. At 0912(I); 21 May, while in position 6 - 053, 114 - 043, a DD or Gunboat was sighted bearing 1600T, range about 10 miles. The contact was on course 2400T, evidently heading towards Surabaya at high speed. An attempt to end around on this contact ended abruptly when we met the H.M.S. THUR-PIN limping home badly damaged.

(G) AIRCRAFT CONTACTS.

In the area south of Hong Kong the Japs were using radar planes at night, and it is believed that they were depending less on their own radar than they were on ours and on our SD or 3T. There appeared to be a slackening off of enemy activity in other areas. Our own planes are probably responsible for that. It is believed that some of the SD contacts we dived for were friendly planes. However, when visibility is poor, and a plane continues to close without answering IFF, the CVN has dives.

(H) ATTACK DATA.

No attacks made.

(I) MINES.

During the afternoon of 26 April, a moored type horned mine was sighted adrift in the area south of Hong Kong. During the night, on several occasions, radar contact was made on several possible floating mines also in the same general area, but they were not sighted.

(J) ATT-SUBMARINE M/S SURE - ID IV SICN 4-0TIC3.

None encountered.

— page 280 —
U.S.S. CAVALRY - Report of Fifth War Patrol.

(K)  MISSION DETAILS OF D.M.C.L.

1.  MISSION DETAILS OF D.M.C.L.

(c) 21 April - The speed regulating governor on a main engine failed to follow the selsyn transmitter in the maneuvering room. The governor was disassembled and all electric1 contacts and leads cleaned and dried. The selsyn repeater in the governor was disassembled and the damping spring for the damping weight found missing. The selsyn repeater unit from the spare governor was installed and the governor re-assembled and placed back in commission.

(b) 25 April - One exhaust valve retainer on cylinder #6 of the auxiliary engine stripped off allowing the valve to stick in the cylinder. Heed assembly was removed and valve assembly removed. The old valve was found to be bent and required replacement. No damage was done to the piston or liner.

(c) 27 April - Both vapor compression stills developed grounds necessitating putting them out of commission. Upon removing the insulation from the stills it was found that a salt water leak was causing the heaters and heater wirings to ground to the shells. These leaks were between upper and lower intermediate flanges on both stills. The studs securing these flanges were found to be loose, so were tightened. The flange joints painted with glyphitol. The stills were reassembled, and started to make fresh water. Very shortly 2 still had to be secured due to a 150 volt ground. The still was disassembled and numbers 2, 4 and 8 heaters were found to have grounds. It is believed that these heaters had small pin holes which opened up after reaching high temperatures and allowed salt water to get at the heaters causing the grounds. These defective heaters were replaced.

(d) 27 April - The power supply panel to the forward engine room caught fire when two fuse clips were shorted upon insertion of a fuse into the panel. The roll of the ship caused the electrician to miss the proper slot and grounded across two adjacent fuse clips. The fire was quickly extinguished. The damage to the fuse panel consisted of twelve burned fuse clips, and partial burning of the backline panel. The

— page 281 —
U.S.S. CAVALIER - Report of Fifth War Patrol.

fuse clips were removed, pxncl aclncd, cnd addi-
tional insuletion installed on the bck of the panel.

(a) 29 April - The power supply fuse from the lighting
motor generator panel to the IC generator power
supply panel was faulty, and made and brake contact
due to vibration. Then the circuit opcnad, first
indication was ringing of the gyro alarm bell. IC
motor generators were then shifted and the fuse at
this point again completed the circuit and power was
supplied as normally. The fuse again broke contact
and IC power lost. Both IC motor gener tors were
placed on load, but did not start due to lack of
power to them. The emergency power supply was cut in,
but the fuses in the panel and in the forward battery
well blew, and there was no power supply for the IC
motor generator sets. The fuses for the emergency
supply were replaced, and power was supplied to the
IC motor generators by the emergency power supply.
The faulty fuse on the lighting motor generator panel
was then replaced, and normal power restored to the
IC circuit.

(f) 29 April - One exhaust valve retainer on cylinder #6
of the auxiliary engine failed. The valve guide
bushing was broken off at the level of the cylinder
head, and the valve stem was found to be bent. Piston
and liner were not damaged. A complete new head
assembly was installed with four new exhaust valve
assemblies, and new gasket seals.

(g) 2 May - The auxiliary engine generator flooded about
one third with lub oil through the tube oil filling
valve when #3 and #4 main engines were flushed down
with lube oil from the standby pump. The generator
was drained and the commutator and armature sprayed
with 1 gallon cleaning solvent, 5 gallons grain al-
cohol, and 15 gallons torpedo alcohol with an air
spray gun using 200 pound air. The generator was
then blown down with 200 pound air and with a porta-
ble blower. The armature was then rotated by the air
start, following which it was blown down again. It
was then started and run at 650 RPM to throw out any
oil and solvent remaining, after which it was again
blown with air and heated by light bulbs and a field
current. All brushes were renewed. Finally, the load
on the generator was increased in steps over a period
of time, and the operation found satisfactory.

— page 282 —
5 May - Control rheostct on 2 min engine overncor burned out and was replaced by spare removed from spare governor. A small hole developed in the forward top shell of #2 min engine muffler, allowing a small water spray and increasingly loud exhaust noise.

(1) 8 May - A knock developed in the running gear of #7 unit of #1 min engine. The rocker lever sheft and rocker levers for the valve bridges and injector were removed and one warped valve bridge removed.

(1) 11 May - The feed pump for the vapor compression stills overloaded the pump motor. Disassembly of the pump showed that the impeller was worn and rubbings against the pump housing. A cut was taken on the housing to remove the high points where the impeller rubbed, but this did not prove satisfactory. To provide feed water to the feed water manifold of the stills, a line was run from the discharge side of the fresh water cooler of #2 min engine. The engine cut-heated pump provided the necessary pressure to the feed water and no cooling water was lost to the coolers. This worked satisfactorily.

(1) 13 May - Auxiliary engine tachometer cable stripped, and also stripped the fiber gear in the tachometer. No spares are carried. Using the hand tachometer, for positions were marked for the hand throttle for normal speeds of operation of the auxiliary engine. For the remainder of the patrol, the speed was set in this manner, checked half hourly with the hand tachometer. Muffler on #1 min engine carried away.

(1) In attempt was made during the refit at Subic Bay to put an equalizing charge in the battery, but the charge had to be stopped due to high temperature. Since that time we have been unable to put a normal charge in the battery without reaching or exceeding the high temperature limit. All attempts to lower the temperature were unsuccessful.

2. HULL.

(a) The pit log input to the TOC was operating in a reverse direction when we departed on patrol. This was discovered while making practice approaches on the day we left. Two days previous while training in Subic Bay area it had been functioning normally, how-

— page 283 —
U.S.S. CAVALIER - Report of Fifth Torpedo Patrol.

cver, work was being done on the pit log at the time. Somehow, the leads to the TDC were reversed. The condition was remedied by reversing the leads in the junction box for the speed h:lving device, this box being the most accessible one.

(b) Two days before departing on patrol a new #2 periscope was installed. A slight grinding was noticed at the time, but since then, it has steadily been growing worse. On 20 April it began looking nitrate, and since that time we have been forced to recharge the periscope every three days. On 21 April it became impossible to shift the periscope to low power. This condition was caused by slippage somewhere between the handle operating shaft and within the scope itself. The handle was disassembled, but the case could not be found. In order to be able to shift the scope from high to low power the limit stop was removed from the handle. A periscope has developed a grind, probably caused by rust falling from the inside of the periscope shorts into the bearings.

(c) The new type positive acting conning tower hatch interior look was installed during the last refit. On 27 April during a dive, the interlock caught on the edge of the hatch coming instead of sliding down and releasing the pin, resulting in a bent interlock which prevented the hatch from being dogged down. The valve forced to surface to remove the interlock. The old type interior look was removed from the after b:ttcry hatch and installed. The hatch still looked badly, and this was corrected by making adjustments to the dogs. Turn steering on the hatch causes the operating hand wheel to be jammed in the open position on surfacing. This can only be remedied by new gearing, or possibly repairing the old.

(d) Considerable trouble has been had with the hydraulic system. Towards the end of the first week several bad leaks developed in packing and nuts and relief valves. This caused the accumulator to charge about every 50 seconds. In about three days the locks were stopped and the interlock between charges interfered to one minute ten seconds. About the second week the operation of the plant started becoming noisy and required more frequent adjustments of the control valve and automatic by-pass valves. On 29 April the 750# relief valve lifted, the motor control panel heated up, and the plant had to be secured for a short while to let it cool off before the control valve and automatic by-pass could be readjusted. On 17 May it became apparent that the interlock had been removed.

— page 284 —
U.S. CAVITA - Report of Fifth Tor patrol.

Subject: U.S. CAVITA - Report of Fifth Tor patrol.

ent that further adjustments of the valves are useless, since the operation was not satisfactory on any setting. During an all day dive on 16 May the plant was put out of commission to overhaul the valves. Both the automatic by-pass and control valves were found to be scored and coated with small metallic chips, causing sticky operation, and also causing the by-pass to ride in a slightly cocked position. The chips were cleaned out and the valves lapped in. The plant was much quieter and charged at intervals of two minutes when reassembled. It was found that by securing the hydraulic service forward the length of time between charges could be increased another minute, and securing the service aft, be increased to seconds. By closing the cut-out valve the plant would hold a charge for about fifteen minutes, therefore the excessive leakage with in the system must be forwarded. The suspect the torpedo tube outer door control valve. It is felt that the cause of the trouble was the metallic chips throughout the system which were not being completely removed by the strainer, and the use of 2110 instead of 2135 hydraulic oil which had been used on previous patrols. The thin oil tended to increase the amount of leakage in the system.

(L) RADIO.

No serious damage resulted to any of the radio equipment. A loose ground lcd in the XM-6 receiver once caused bad pickup from the SD radar and accounted for several badly copied messages. Two transmissions were made north of the Maley Barrier. The were forced to remain on the air five minutes longer than necessary on the first because the ZUJ operator did not change his authenticator card on time. The ZUJ operator insisted on our second transmission being better perfect, resulting in too much time on the air. A third message sent south of the Barrier during the early afternoon of 22 May required two hours on the air. Conditions were very unsatisfactory. Best frequency at first was 12705. VIM answered our call but could not receive us after the first 25 groups. VIM was interfered with by VHO. The message had to be sent in groups of 25, and although it was finally recopied for, when it was rebroadcasted there were five groups missing. The VHO was unable to send a correction immediately. Anyway, we sent in a correction immediately.

— page 285 —
1. 35 RADAR. - After 270 hours of operation, the 8014A oscillator tubes had to be changed, excessively currents were drawn at low voltages. Occasionally the length of the sweep varied, causing the focus to become poor. This fault was traced to varying IC voltages. On the whole, ranges were good, the maximum on a plane being 35 miles. Occasionally the 3D ranges were checked when the 3J had lent at the same time. The 3D on each check was reading too low, and the length of the sweep was adjusted to correct the error.

2. 35 RADAR. - The operation of this gear was satisfactory. Following casualties occurred:

   (a) The 2x2 rectifier in the range indicator became gassy and the sweep disappeared. Repeller voltage to the 726B was also lost.

   (b) Excessive noise on the A scope and the 3PI was investigated and found to be caused by two bed 717A tubes in the preamplifier in the transmitter. After the tubes were replaced the noise disappeared.

   (c) The oscillator lost its power output after 210 hours of operation. This was the 726B. The trouble showed up on the wavemeter after an attempt had been made to retune the transmitter. A new tube was installed.

(N) SCWER GEAR AND SOUND CONDITIONS.

The sound gear was in good operating condition throughout the run. No defects were observed. The work done during the last refit to improve the JP training was highly satisfactory. The training gear now has very little backlash, and the operation is very smooth. Sound conditions in the Java Sea were exceptionally good because of positive gradients and shallow bottom. Bain squalls were often detected at ranges out to 15,000 yards.

— page 286 —
0) DENSITY LAYERS.

| DATE  | TIME   | POSITION | REMARKS                                                                 |
|-------||||
| 4/11/45 | 1430 (I) | 14 - 53N | Isothermal to 150 feet, 90° negative gradient to 350 feet. |
| 4/15/45 | 1300 (I) | 14 - 49N | 20° negative to 190 feet, 70° negative to 300 feet. |
| 4/17/45 | 1100 (I) | 14 - 50N | Isothermal to 210 feet, 70° negative to 300 feet. |
| 4/20/45 | 1415 (I) | 14 - 42N | Isothermal to 90 feet, isoballast to 230 feet, 70° negative to 300 feet. |
| 4/22/45 | 0900 (I) | 15 - 32N | Isothermal to 80 feet, 40° negative to 110 feet, isoballast to 230 feet, 60° negative to 300 feet. |
| 5/3/45 | 2300 (I) | 21 - 34N | Isoballast to 120 feet. |
| 5/6/45 | 1030 (I) | 13 - 26N | Isothermal to 100 feet, 90° negative to 170 feet. |
| 5/7/45 | 0001 (I) | 11 - 33N | Isothermal to 90 feet, 30° negative to 120 feet. |
| 5/23/45 | 1100 (I) | 14 - 57S | One half degree positive gradient to 120 feet. |

(P) HEALTH, FOOD AND HYGIENE.

The health of the crew has been fair. There were two admissions to the sick list due to catarrhal fever, and many cases of head colds. All hands have taken atrabric during the patrol, and no cases of malaria have developed. No communicable diseases were noted or treated. Habitability was very good, except that it was rather uncomfortable by hot during all day drives due to high battery temperatures expiring. Food was very good, with the exception of butter, which went bad after the first week of the patrol.

— page 287 —
U.S.S. CAVALIA - Report of Fifth Tor Patrol.

(Q) PER 30TH LT.

The performance of duty of all hands was excellent. The new men and officers have stepped into the organization like veterans. Although we have had two disappointing patrols in a row, the morale and spirit is still very high. The new men and officers took a big interest in learning the boat, school of the boat being conducted each day for them.

(a) Number of men detached after previous patrol 16
(b) Number of men on board during patrol 76
(c) Number of men qualified at start of patrol 47
(d) Number of men qualified at end of patrol 62
(e) Number of unqualified men making their first patrol 12

(R) MILES STEAMED - FULL USED.

| Miles Steamed | Fuel Used |
|||
| 408            | 4786       |
| 7390           | 81164      |
| 1600           | 18460      |

(S) DURATION.

| Duration | Fuel | Provisions | Personnel |
||------|||
| 22        | 9000  | 25 days    | 15 days   |

Limiting factor this patrol - Orders.

(T) CONDITIONS, R.D.R., AND SONAR COUNT INSTRUCTIONS.

(A) R.D.R. COUNTERMEASURES.

1. (a) 160 megacycle radar was detected almost continuously in the vicinity of 21 - 30N, 114E. It is believed to be the radar on Pun Tin Island. The sw.ep rate varied from 0.5 to

— page 288 —
0,2 RPM. The furthest distance at which the radar signal was picked up was 55 miles. Occasionally the radar beam appeared to steady on us, one time at range of 39 miles. Radar characteristics, 160/500/6.

(b) 80 megacycle radar was detected in the sea vicinity of the 160, but not at 160, and was probably located near Kowloon. Normally the sweep rate was 0.4 RPM, but it varied considerably. At one time it appeared to steady on us when we were about 40 miles from it. Characteristics, 80/600/8.

(c) 204 megacycle radar was encountered three times in vicinity of Hong Kong. Sweep rate was irregular. It appeared to steady on us once at 35 miles. Characteristics, 204/250/7.5.

(d) 300 megacycle radar, probably interfered, was occasionally picked up near Hong Kong, with characteristics 300/200/3. It was never strong. The sweep rate was constant at 0.2 RPM.

(e) 120 megacycle radar was picked up in vicinity of 6-40N, 137-20E, after it had caused weak interference on the SD radar. The PRF was 50, but the pulse did not lock like an SD pulse, and the frequency was too high. Five minutes after the detector picked up the radar the SD had a plane contact with no RF reply.

(f) For the first time no radar interference was picked up in Lombok Strait.

2. No radar jamming was encountered.

3. No deceptive practices were employed by the enemy.

(B) COMMUNICATION OCCURRENCE.

1. One possible intercept of the enemy was noted on the primary rococo frequency, 7615 kcs. This occurred at 1930 (I) on 1 May while operating in the vicinity of Hong Kong. Attempts at authentication were very poor. The message...

— page 289 —
U.S.S. C-7.LL. - Report of Fifth Torpedo Squadron.

would not break by current or p.st. citations of OSP 1270.

2. (a) On 2 May in vicinity of Hong Kong, the torpedo-cast from VBO was jammed heavily on 9250 kcs by a high pitch noise. Similar jamming was detected on 12630, but it could be copied through on this latter frequency. The signal on 9250 was very strong and made carrying impossible. The band width of the jammer was about 20 kcs, so that shifting frequency did not help. Frequency control was excellent. The jamming occurred at 2250 (I) and lasted until 0300 (I).

(b) On 3 May in vicinity of Hong Kong, jamming occurred on 9250 all day. The signal could be copied through after tuning the RBM-2 receiver slightly off frequency.

(c) On 6 May in vicinity of Cookin Chin, a station with all sign F283.sent out a series of irregular dashes from 2045 (I) to 2100 (I). These signals blocked out the B kors schedule entirely, and shifting frequencies and detuning was of no help.

(d) On 22 May while near north no st of Java, WML-1 was heavily jammed on 9250 from 0500 (I) to 0715 (I). The signal was intermittent and shifting frequency made it difficult to determine. Signal 1 was 8-5, and width 30 kcs.

3. No definite attempts at deception were noted during our ship-shore broadcasts. No deceptions were noted on the Sef Plan frequencies.

(c) SONLF QUOTATION SURVEY.

None encountered.

(V) REMARKS.

After it communications were highly unsatisfactory. At no time was we able or did it hear another submarine close to sector plane first. However, if the plane itself originated the call, communications were satisfactory. Here are a few examples. On 26.pril

— page 290 —
U.S.S. C V.II. - Report of Fifth "Firth" Patrol.

near Heinzelman's plane. With C.C. call 0022 communicated with us in order to get a message to the CHR. This plane could not be rescued unless he had just sent a call. On 9 April near Hong Kong sector 2 plane had to call CHL N before establishing communications, although plane had been called several times first. Plane did not know we were in sector. During lifeguard duty from 25 March to 3 May off Hong Kong we never could contact planes, although at times they were as close as 4 miles. Although we could hear the planes communicating on 4475 kcs, we couldn't get them to listen to us. ...s result of the above experiences, we have come to the following conclusions:

(1) Plane must initiate communications.

(2) They have to know a submarine is in the area before they send out a call. It was not until 22 May, while in the Java Sea, that a plane was heard to send out a call for all submarines.

(3) Viability error frequency is not our added unless plane is trying to reach a certain submarine.

(4) Once a plane has started transmitting, reception is excellent, frequency control and stability good.

(5) Authentication by Schickel Cipher and CSP 1270 has always been proper.

— page 291 —
FCS-30/AL6-3
Serial: 069.
CONFIDENTIAL
FIRST ENDORSEMENT TO:
USS CAVALLIA. Report of
Fifth War Patrol.

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

Subject: U.S.S. CAVALLIA (SS244) - Report of Fifth War Patrol.

1. The fifth war patrol of the CAVALLIA, conducted in the South China Sea and Java Sea areas was of 38 days duration, 30 of which were spent in the assigned areas. Lifeguard stations were assigned on numerous occasions; no request for services were made. The CAVALLIA escorted the H.M.S. THIRRAPIN from 21 to 27 May. The THIRRAPIN had been severely damaged by depth charging and could not dive when first contacted.

2. Area coverage was excellent, however there was only one contact worthy of torpedo fire. An end around on this contact was broken off in order to lend assistance to the THIRRAPIN. Contact with enemy aircraft and sail boats were numerous.

3. The CAVALLIA returned from patrol very clear but in poor material condition. Major material deficiency appears to be the main storage battery, the condition of which will be investigated and such corrective action as is possible will be taken. It is expected that the refit may extend beyond the normal period.

4. The Commanding Officer, officers and crew are congratulated upon the completion of another arduous patrol, which provided no opportunity to inflict damage to the enemy, and for the excellent job of escorting the H.M.S. THIRRAPIN.

C.C. SMITH, Jr.

— page 292 —
FR24-71/16-3
UNITED STATES NAVY
11/dn
Serial 079-A
13 June 1945.
C.O.
The Commander Submarines SEVENTH FLEET.
To:
The Commander in Chief, UNITED STATES FLEET.
Via:
The Commander SEVENTH FLEET.
Subject:
U.S.S. C.V.III. (SS244) - Report of Fifth War Patrol - Comment on.

1. The Fifth War Patrol of the C.V.III., under the command of Commander H.J. KOSSILER, U.S.N., was conducted in the South China Sea off the Coast of INDO-CHINA, and in the J.V.A. SEA.

2. Intensive area coverage was maintained throughout this patrol, but only one enemy escort vessel was sighted and an on-approach run was immediately commenced. However, about a half hour later H.M.S. TERRIPIN was sighted. She reported that a recent enemy depth charge attack had seriously damaged her pressure hull; so C.V.III. broke off the chase and escorted the damaged TERRIPIN to FRENCH TIDE.

3. On two occasions the conning tower hatch failed to close completely upon diving, but immediate and correct countermeasures by this well trained crew succeeded in localizing the resulting flooding.

4. The award of the Submarine Combat Insignia is not authorized for this patrol.

5. The Force Commander congratulates the veteran Commanding Officer, the Officers and Crew of the C.V.III. upon their conduct of this arduous patrol and upon their excellent performance of escorting H.M.S. TERRIPIN to port.

RICHARD S. THOMAS
JAMES FIRE
JUN 25 1945
RECEIPT NO. 51
JUN 25 1945
RECEIPT NO. 51

— page 293 —
11/4n
FEB-71/A16-3
UNITED STATES NAVY
11/4n
Series: 079-A
C-ONF-T-D-R-F-T-I-A-I
13 June 1945.
SECOND ADDRESSING TO:
USS O.V. INN. CONTR. LT.
A16-3, CATED 27 MAY 1945.
Report of Fifth War Patrol.
Subject: U.S.S. O.V.IN. (SS824) - Report of Fifth War Patrol -
Comment on.

DISTRIBUTION:
Cominah (3) Direct, CTG-71.8
Vice OpN.V (2) Direct ComSubRon-22
Vice OpNav 07-236 (1) ComSubRon-26
Com1stFl1 (1) DivComSubRon-30
Com2ndFl1 (1) DivComSubRon-22
Com7thFl1 (2) DivComSubRon-26
ComSub1stFl1 (30) DivComSubRon-30
ComSub2ndFl1 (4) S/M School, I.L. Comm.
CTF-71 (7) Comdt. INT, Fuget Sound
OTG-71.5 (2) Subd, Mare Island
S/Ms 7thFl1 (1)

THIS REPORT WILL BE DISTROYED PRIOR TO ENTRY INTO ENEMY COMMAND WATERS.

J. B. MILLER,
Flag Secretary.

— page 294 —
29 JUN 1945

SUBJECT: 29 JUN 1945
SURVEY SUBMARINE FLIGHT
00, USS CAVALLA (SS-24)
Comdr. 1st. AIS-3 dated
27 May 1945. Report of
Fifth War Patrol.

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

Subject: U.S.S. CAVALLA (SS-24) - Report of Fifth War Patrol.

1. Forwarded.

Copy to:
Commander Seventh Fleet.
Comdr. 1st. AIS-3
00, USS CAVALLA (SS-24)

— page 295 —
1/2
SS244/416-3
U.S.S. CAVILIA
DECLASSIFIED

From: The Commanding Officer:
To: The Commander in Chief, United States Fleet.
Via: (1) The Commander submarine force, Pacific Fleet Administration.
(2) The Commander in Chief, Pacific Fleet.
(3) The Commander in Chief, Pacific Fleet.

Subject: U.S.S. CAVILIA (SS244), Report of per Patrol Number 5L.

Enclosure: (1) Subject Report.
(2) Track Check (ComsubPac only).

1. Enclosure (1), covering the Sixth per Patrol of this vessel conducted in the Ampere area during the period 5 August 1945 to 12 September 1945, is forwarded herewith.

H. J. TOSTER

DECLASSIFIED
DECLASSIFIED-ART. 0445, OPPARVIST 5510.1C
BY 00-0009 DATE 5/12/12

142.357

— page 296 —
1. PROLOGUE

Arrived Fremantle, West Australia, from Fifth Torpedo Patrol on 27 May 1945, for normal refit by the Submarine Repair Unit and Submarine Division 301, Captain J. L. Hull, U.S.N., Division Commander. The ship was drydocked for routine bottom work from 4 June to 6 June. The following major work items were accomplished during the refit:

(1) Overhauled #1 and #2 main engines.

(2) Installed c. second Ion X-ray gun unit in coxh battery well.

(3) Installed four new main engine mufflers.

(4) Rebuilt and reinstalled starboard main motor reverser switch.

(5) Replaced #1 and #2 periscopes. Honed passive-cope bearings and renewed hoist cables.

(6) Installed Mk 7 Iod 1 DRT in conning tower; installed dummy log assembly and made alterations to DRAI and gyro panel in connection with this installation.

(7) Renewed operating gear on the upper conning tower hatch.

(8) Phosphor bronze rings installed in stern plane diving piston, ship's 83/321 (615).

(9) Reinforced 4" deck gun with a 5"-24 caliber gun. Made changes to ready lockers and magazines to take 5" ammunition.

(10) Replaced 40 15" gun.

(11) Overhauled pitmachter log and installed alteration S-1678.

(12) Installed 3T radar gear and periscope, which were subsequently removed. The cables and munitions were left in place, and 3T radar restored to its original condition.

(13) Four PR antennas were installed to provide directional features.

(14) RHB-2 radic receiver was installed and Kingsley receiver removed.

— page 297 —
12 - 19 June, when it was decided to employ t
vessel for a special mission, and the remain
the training cancelled. Very little trainin
was obtained due to the continued bad weath
Edward J. Koehne, U.S.N., was detached and
to duty with Advance Training and Relief Crew
Special torpedo lording completed, and readines
sea on 24 June. No ready war shots on board, n
very little ammunition.

24 June - 8 July. Enroute from Frunntle, Austr
to Guam in accordance with CTG 71.1 secret oper
order 83-45 of 23 June 1945. No contacts oper
with exception of friendly planes and shipp
The following routine was assigned: Last of Timo
Obl Majer, Sec. through Narple Strait, Last of
below Harita and Gebe Islands, through passage
to Guam. North of Balmhera joined up with TIG
(DE-553), who escorted us until 7 July, then she
was relieved by Tacn L. WILLIAMS (DR-370) in
vicinity of Palau Island.

Arrived Guam on 8 July, and moored alongside U.S.
Fronus for voyage underway by three vessels and
marine Division 151, Captain T. C. Hawk, T.S.C.
Ishad were unloading of cargo items to be accom
of St. Peter's airport and port, install lin
for war patrol, and the detonation of an infla
tion of the docks of the enemy war materiel
port stores in order to provide a base of s
RTA to the enemy. This was scheduled for a
anticipated arrival date of 15 July. The
case required personnel to carry out a critical
officers and men to carry out a critical
stay at Camp Davidson for a week to be
the course of the enemy's attack. The job
deteriorated considerably and was scheduled
was a critical time to be completed. The job
ship was a critical time to be completed. The

— page 298 —
4 August, and readiness for sea on 5 August.
Lieut. (jg) Ernest J. Zellmer, U.S.N., was detached on 24 July in accordance with ComSubPacAdCom despatch 150159. Lieut. Robert W. Dickinson, U.S.N., reported aboard for duty on 21 July, in accordance with ComSubAdVase Orders #926, serial 704, dated 17 July 1945.

(B) NARRATIVE

Following is the list of officers and chief petty officers attached to this vessel, with total number of patrols made, including the sixth patrol of this vessel just commencing:

| Name          | Rate | No. Patrols |
||------||
| Kossler, Herman J. | 10   |             |
| Eberle, Edward R. | 6    |             |
| Dickinson, Robert W. | 7    |             |
| Rand, Arthur G., Jr. | 6    |             |
| Page, Edward C., Jr. | 5    |             |
| Purdie, Robert W. | 5    |             |
| Honza, Donald W. | 5    |             |
| Kainzinger, Thomas P. | 3    |             |
| Nichols, Ray H. | 3    |             |
| Ryan, Lloyd E. | 3    |             |
| Wert, Woodrow W. | 3    |             |
| Bennett, Stacey V. | 3    |             |
| Halco, Marion I. | 3    |             |
| Hamilton, Ramon W. | 3    |             |
| Lee, James R. | 3    |             |
| Mandelbaum, Kermit | 3    |             |
| Holt, Kay B. | 3    |             |
| Lopez, James E. | 3    |             |
| Willis, George A. | 3    |             |
| CME (aa) (T), U.S.N. | 3    |             |

— page 299 —
6. August 1945

1035 (K) Sighted rubber life boat about 30 miles west of Anctchen Island; Mcneuered to pick it up. It was single men size, and had apparently been carried for some time. There was nothing in the boat.

1200 (K) Position, 16 - 24N, 144 - 35E.

7 August 1945

Sighted many friendly planes during day.

1200 (K) Position, 19 - 41N, 141 - 12E.

1606 (K) Submerged for trim dive, and went deep to test for locks.

1703 (K) Surfaced.

2342 (K) Sent our first message to CTF-17 inquiring about changes in Oporad routing instructions.

8 August 1945

Sighted many friendly planes during day.

0344 (K) Received reply to our message from CTF-17.

0559 (K) Submerged for trim dive, and went deep to test for locks.

0648 (K) Surfaced.

1200 (K) Position, 23 - 48N, 139 - 32E.

9 August 1945

Sighted and talked to many friendly planes during day.

0705 (K) Submerged for trim dive, and went deep to test for locks.

0826 (K) Surfaced.

1200 (K) Position, 28 - 43N, 139 - 38E.

1226 (K) Submerged for training and drills.

— page 300 —
1444 (K) Surfaced.
: 2236 (K) Rechanged recognition signals and calls with TIT-FISH.
: 10 August 1945
: Sighted many friendly planes during day. Tilted with a PB4Y who was having engine troubles. To closed us to about two miles, asked for our position, which we gave him, and then departed for home and we didn't see or hear from him again.
: 0705 (K) Received message from CTF-17 changing our patrol station from the Polar Circuit to lifeguard duties in area H-6.
: 1200 (K) Position, 32 - 29N, 141 - 22E.
: 2212 (K) Sent message #2, acknowledging receipt of message from CTF-17.
: 11 August 1945
: Entered assigned area during early morning.
: 0545 (K) Submerged for trim dive and went deep to obtain bethythiomorph carb.
: 0712 (K) Surfaced. Commenced search for yellow jacket reported by PTFO yesterday.
: 1200 (K) Position, 37 - 21N, 142 - 23E.
: 1703 (K) Sighted friendly submarine, believed to be PTFO. Unsuccessful in closing him, and unable to connect by radio. Would have liked to have obtained information on downed evictors. Found out later from CTF-17 message that PTFO had resumed them.
: 2030 (K) Discontinued search, and set course to clear this area, which becomes air surface at 0100K tomorrow morning.
: 12 August 1945
: 0505 (K) Lifeguard duties for today cancelled.
: 0607 (K) Submerged, and set course to close the coast. Position uncertain due to no fix this morning. Decided to take advantage of today to do necessary routine jobs.

— page 301 —
1200 (K) Position, 37 - 05N, 141 - 37E.
: 1226 (K) Lost use of master gyro compass and reporter for 1-2 hours due to faulty fuses.
: 1603 (K) Surfaced. Fog had begun to close in, reducing visibility to about 1 mile.
: 1618 (K) Lost all IC power when motor generators overrated during trip kicked out. Shifted steering to control and employed auxiliary gyro.
: 1652 (K) Cause of overload located and remedied. Spent next hour swinging ship in fog.
: 2235 (K) Received orders from CTF-17 to proceed to area T-5 for lifeguard duties tomorrow.

13 August 1945

: 0515 (K) Received despatch from CTF-17 that strikes were called off and lifeguard duties cancelled.
: 0553 (K) Sighted four very low flying planes, distant about five miles, heading directly for us. Submerged. Sky completely overcast making pl planes difficult to see, so decided to remain down until it cleared somewhat.
: 1030 (K) JP picked up disturbance which sounded somewhat like screws bearing 139T, but nothing could be seen through periscope at 55 feet.
: 1051 (K) Made proper corrections for surfacing, but on coming to radar depth picked up plane at six miles, so went back down again. About ten minutes later heard noises that sounded like distant depth charges. Decided to stay down and await developments.
: 1200 (K) Position, 35 - 51N, 141 - 54E.
: 1512 (K) Sighted most of ship bearing 058T, which soon developed into four ships. Went to battle stations and changed course to normal approach course.
: 1532 (K) Ships identified as Dactyroys, but not uncertain if they are friend or enemy.
: 1541 (K) Heard three heavily heavy explosions in direction of ships, range now about 9000 yards. Also could see several unidentified planes.

— page 302 —
1550 (K) Ships identified as friendly. Changed course to evade. He could now hear them pinning.

1559 (K) Destroyers evidently had picked us up as we lost "S" came over sound gear. A lock through p.r.i.t showed all four had changed course, and were turning towards us first with a zero angle on the bow, r n about 6000 yards. About this same time her challenge on sound gear.

1601 (K) Commenced exchanging recognition signals by sound, and wildly firing proper color smoke bombs.

1605 (K) All secured away with the Cans, who changed course to pass well clear of our position.

1612 (K) Took one reel of kodachrome movies through the periscope of the four U.S. Destroyers 50 miles off Jap coast.

1630 (K) Murfaced. Many planes round, the closest two about 4 miles. They closed and circled us a couple times, and then shoved off. Set course to close coast.

1707 (K) Sighted no more type mine edrift, 35-43N, 141-4. It attempted to sink with gunfire with no success.

1959 (K) SD contact on plane, range 4 miles, not answering IFF.

2000 (K) Submerged.

2037 (K) One to radar 6oth and raised mast. SD contact at 8 miles, which quickly closed to 6 miles, not answering IFF. Based pick down.

2111 (K) All clear at radar depth. Surfaced.

14 August 1945

0220 (K) Sighted what appeared to be a flare dropped some distance away. Made careful search in that direction and found nothing.

1200 (K) Position, 36-06N, 141-52E.

1515 (K) Sighted no more type mine edrift, 35-44N, 141-35E. It attempted to sink with gunfire with no success.

1957 (K) Received lifeguard station for tomorrow from Cm Subsea.

— page 303 —
2226 (K) 3D contact on pl.ne, range 5 miles, not answer IFF.
: 2227 (K) Submerged.
: 2316 (K) All clear at radar depth. Surfaced. For the next 2 hours, the ship will be in a state of alert and will be in a state

— page 304 —
1203 (K) Submerged. No damage was done by bomb and no fire. Other attacks were made. The plane was a flight. Commenced drafting to Consubra on 14th. contact report at aircraft code to call ship. It was the 1st. hit. It was not detected in knowing the enemy's. It was not detected in knowing the

— page 305 —
1200 (K) Position, 38 - 58N, 144 - 27E.
19 August 1945
0800 (K) Sliched and exchanged calls with TIGRON. Closed notified TIGRON to patrol northern half of area.
0844 (K) SD contact, range 18 miles, answering IFF. PI was not sighted until it had closed to 5 miles, was identified as a B-29. It passed directly over us, and disappeared to the northwest, in direction Honshu.
1200 (K) Position, 39 - 04N, 143' - 11E.
20 August 1945
1200 (K) Position, 38 - 56N, 144 - 31E. Sliched many expendable gas tanks in water today.
21 August 1945
0516 (K) Submerged for trim dive. Went deep to obtain bathythermographs card.
0829 (K) Sunfaced and resumed patrol.
1045 (K) Closed to within 25 miles of coast of Honshu but could not see land due to haze.
1200 (K) Position, 38 - 48N, 142 - 25E.
1217 (K) SD radar contacted plane, range 6 miles, but not seeing IFF, closing rapidly.
1932 (K) Submerged. Range to plane 4 miles, still not seeing IFF.
1428 (K) Sunfaced and resumed patrol.
22 August 1945
3022 (K) Sliched B-29, range 12 miles, which was lost to S.6th at 17 miles, heading for Honshu coast.
1320 (K) Position, 38 - 49N, 143 - 36E.
1125 (K) Coast of Honshu in sight through 1 light haze.

— page 306 —
2101 (K) Received Serial 50 from Consubpae, informing me that we would participate in Japanese surrender ceremonies at Tokyo along with eleven other submarines. This brought forth a mighty cheer throughout the boat when the word was passed.

: 2307 (F) Sent Serial 5 to Consubpae, acknowledging receipt of his serial 50.

: 23 August 1945

: 1130 (K) Submerged. Went deep to obtain bathythermogram card.

: 1200 (F) Position, 38 - 47N, 144 - 23E.

: 1448 (K) Surfaced and resumed patrol.

: 24 August 1945

: 0330 (K) Sighted and avoided a moored type mine adrift.

: 0742 (K) A B-29 passed overhead.

: 1200 (F) Position, 38 - 55N, 143 - 11E.

: 25 August 1945

: C822 (K) SD picked up, and sighted from bridge, a flight of 12 planes heading toward Honshu. Closest range miles.

: 1200 (F) Position, 38 - 56N, 142 - 22E.

: 1221 (F) Received message from TIGER! concerning searching for and investigating "Rox ble".

: 1322 (F) Notified TIGER! if she contacted the ship to trail and notify Consubpae.

: 1450 (F) Using in, visibility very poor. Radar not operating properly. Jet course to open out from coast and clear for bank, then disassembled and removed working on J. Fader back in corrosion in about two hours.

— page 307 —
26 August 1945

Contacted only one plane on SD during morning, ever, in the afternoon contacted and sighted in VFs. Flights, and talked to three different planes on VFs. None of them had anything for us.

1200 (K) Position, 38 - 42N, 142 - 48E.

1835 (K) Received serial 67 from Consubpaco delaying rendezvous and entry of "Fanny's Peace Makers" into Tokyo Bay by 48 hours.

1847 (K) Received serial 65 from Consubpaco giving details of rendezvous, escorts and routing to Tokyo Bay.

27 August 1945

Sighted 20 carrier planes during morning, all of which passed almost directly over us. Tilted several more during the afternoon. Talked to two of them on VHF, but they had nothing for us.

1200 (K) Position, 38 - 44N, 144 - 11E. Had moved out to the Eastward in order to miss typhoon moving up oceas. However, still ran into very heavy seas, rain and overcast skies.

1847 (K) Sighted two Destroyers on northerly course, not exchanged calls with one of them, the U.S.S. 1st LT. Destroyers discovered to northward.

28 August 1945

Sighted several flights of planes during day, totalling about 25 planes. Several closed and circled us. Last sighted communications with all flights, but they had nothing for us.

1217 (K) Sighted lights of ship bearing 1030T, range 8 miles. Ship was on southerly course, speed about 12 knots. Noticed as instructed.

1200 (K) Position, 38 - 55N, 143 - 12E.

1847 (K) Sighted one out of commission due to loss of fresh pressure.

1217 (K) Sighted several planes during day, but unable to contact by radio.

— page 308 —
1200 (K) Position, 38 - 36N, 142 - 31E.
: 2110 (K) Exchanged recognition signals and calls with
: 2328 (K) Exchanged calls with GATO.
: 30 August 1945
: 0530 (K) Shifted end exchanqed calls with ARK RIFLE.
: 0648 (K) 3 engine back in commission, having been cut since
: 1200 (K) Position, 37 - 48N, 143 - 13E.
: 1217 (K) Joined up with escort, U.S.S. MAD OX (DD731).
: 1238 (K) Sighted, and shortly afterwards made rendezvous,
: 1305 (K) Received Oporr from RUNNER and joined up in formac-
: 1600 (K) Set clocks back one hour to zone (-) 9 time.
: 1723 (I) A formation of four carrier based planes circled the
: 0342 (I) Exchanged calls with SOUNDO who was escorting d p
: 0635 (I) PILOTFISH end H.E. joined formation eastern, and the
: 0737 (I) Entered Scammi Neda.
: 0942 (I) Commenced entering channel into Tokyo Bay, HUNTING
: 1025 (I) Entered Tokyo Harbor.
: 1146 (I) Moored to nest alongside starboard side U.S.S.
: 1432 (I) Underway from alongside PROTUS, shifting berth.
: 1751 (I) Moored to nest alongside starboard side U.S.S.
: 13 -

— page 309 —
1-2 September 1945

In Tokyo Bey for signing of the Peace Treaty. During our stay, the following was accomplished:

(1) Topped off fuel, water and provisions.
(2) Visited Yokosuka Naval Base. This was a very interesting tour. The Japs had completely evacuated the Base, and much to my surprise, had evidently done little damage before departing. From the looks of some of their equipment, these monkeys aren't as stupid as we think.
(3) Attended a "WJ" party given by Admiral Lockwood at the former Japanese Submarine Base Club at Yokosuka. An excellent time was had by all.

3 September 1945

0630 (I) Received aboard, three officers and twenty two enlisted men from the U.S. PROTUS for transportation to Pearl Harbor.

0815 (I) Underway from alongside U.S.S. PROTUS in accordance with the 20 operation order 1-T-45.

0920 (I) Joined up in formation in Tokyo Bey with RUNTY, TIGRONE, GATO, HUDDO, MUSKILIUNGE, HAK, ARCHIPISH, PILOTISH, RAZORBACK and STGUNDO. Proceeding on various courses to conform to swept channel between Tokyo inner and outer buoys.

1043 (I) Entered Sagami Nade.

1200 (I) Position, 34 - 54N, 139 - 30E.

1400 (I) Took departure from Nojima Saki, submarines in two columns, RUNNER leading starboard column, ARCH RICH leading port column, CAVILL third ship in starboard column.

4 September 1945

Proceeding Pearl Harbor, Uneventful.

1200 (I) Position, 33 - 23N, 147 - 04E.

1500 (I) Set clocks ahead one hour to zone (-) 10 time.

5 September 1945

1045 (K) Submerged, conducting trim dive.

1057 (K) Surfaced and rejoined formation.

— page 310 —
1200 (K) Position, 32 - 17N, 154 - 11E.
: 2300 (K) Set clocks ahead one hour to zone (-) 11 time.
: 6 September 1945
: 0700 (L) Completed removal and disposition over the side of all detonators and boosters from torpedoes carried in tubes. No room to put these torpedoes in racks.
: 1200 (L) Position, 31 - 07N, 161 - 18E.
: 7 September 1945
: 1200 (L) Position, 29 - 50N, 168 - 33E.
: 1900 (L) Turned on running lights and lighted the smoking lamp on the bridge. This moment was as much of a thrill as entering Tokyo Bay.
: 2113 (L) H.P. departed formation and proceeded Midway with aqendicitis case.
: 8 September 1945
: 1200 (L) Position, 28 - 29N, 174 - 57E.
: 1500 (L) Set clocks ahead one hour to zone (-) 12 time.
: 2400 (M) Crossed the International date line. Fifteen months ago we crossed this line heading the other way. It is a pleasure to finally be back in west longitude again. Set clocks back 24 hours.
: 8 September 1945
: 1200 (Y) Position, 27 - 12N, 178 - 28E.
: 2025 (Y) Picked up contact on two separate lighted ships. First ship was not identified, closest range 14 miles. The HUDO exchanged calls with the second ship, which was identified as the P.I-45. Closest range 12 miles.
: 2400 (Y) The HUDO exchanged calls with the second ship, which was identified as the P.I-45. Closest range 12 miles.
: 9 September 1945
: 0097 (Y) Picked up contact on two lighted unidentified ships in company, closest range 13 miles. Identity of ships not established.
: 0122 (Y) Position, 24 - 01N, 173 - 48W.
: 1200 (Y) Position, 24 - 01N, 173 - 48W.

— page 311 —
2000 (Y) Set clocks ahead one hour to zone (4) 11 time.

10 September 1945
0210 (X) H.K. rejoined formation as third ship in the port column.

1051 (X) Submerged. Conducted trim dive.

1110 (X) Surfaced and rejoined formation.

1200 (X) Position, 22 - 13N, 168 - 15°.

1700 (X) Received name of escort, PC-485, and rendezvous instructions from Censubpe.cadoom.

11 September 1945
1200 (Z) Position, 21 - 01N, 162 - 25°.

12 September 1945
0400 (Z) Set clocks ahead one hour to zone (4) 10 time.

Joined up with escort, entered Pearl Harbor and moored at prescribed berth.

— page 312 —
1. Weather:
The weather encountered during the period of patrol off the east coast c. 1nshu conformed to tabulated data for this time of the year. Clear skies, smooth seas and light winds prevailed. However, occasional fog banks were encountered when patrolling in viabilities where the cold water of the southbound coastal current met the northbound Japanese Current. In most cases these fog banks were of no great area, and it was possible to run out of them. A typhoon which the Japanese reported hit Tokyo on 22 August was evicted by moving out to the eastern limit of current area.

(D) TID L INFORMATION:
Currents experienced confirmed in general to published information. The change in current direction when crossing East to West, or the reverse, could be forecast in most instances by the sudden and marked change in water injection temperatures when such crossings involved passing from either the Japanese Current or the current into the other. Current velocities were seldom experienced greater than one knot, and averaged about one-half knot.

(E) NAVIGATION L AIDES:
No aids to navigation were encountered during this patrol.

(F) SHIP CONTACTS:
No enemy ships, even junks, were encountered during this patrol.

(G) AIRCRAFT CONTACTS:
Several dives were made in the Honshu area for 3D contacts which closed without answering IFF. Generally we waited until range was 4 or 5 miles before diving. As these planes were not sighted, no information can be furnished regarding them. On 15 August a single plane of an unidentified fighter type suddenly appeared in a dive from the east, and dropped a bomb which missed stern. Although the markings were not seen on this plane, we consider his actions very unfriendly.

(H) ATTACK DATA:
No attacks made.

— page 313 —
1. MINES
: number of hms, mcored type mines were encountered, ed ndrift. All of them were covered with bmrccles, very rusty, and appeared to heve been in the water for a long time.

1. 1707 (K); 13 August - 35 - 43N; 141 - 42T.
2. 1515 (K); 14 August - 35 - 44N; 141 - 35B.
3. 1433 (K); 16 August - 33 - 52N; 140 - 04T.
4. 1704 (K); 17 August - 37 - 35N; 142 - 50T.
5. 1959 (K); 17 August - 37 - 52N; 143 - 09T.
6. 0330 (K); 24 August - 38 - 39N; 144 - 19T.

(J) ANTI-SUBMARINE M.SURFES AND EVASION TACTICS
Ncne encountered.

(K) MAJOR DEFECTS AND D.M.O.E

1. MACHINERY AND ELECTRICAL

(a) 13 August - IC power was lost twice in quick succession due to overload relays tripping out. At this time, the following machinery was on the IC load: 3D and 5J Radar, Loran, Mewis projector and ncrnal surface IC load. The 3D radar was put on the engine room radar motor generator, and power was maintained. This demonstrates the inadequacy of present IC motor generator installation with the additional new gear new installed aboard submarines.

(b) 15 August - Attacked tube coil pump coupling on #1 main engine failed after 1665 hours. Coupling was replaced with spare.

(c) 17 August - Full voltage ground developed on #2 V-pair still. Investigate received that bolts seouring the heater flange had worked loose, allowing water to enter heaters. Six heaters were replaced, bolts tightened, and still replaced in satisfactory operation.

(d) 22 August - The MS. type hydrogen detector began operating erratically. On disassembly all six resistors of the wactstcne bridge circuit were found to have faulty insulation. All attempts at reinsuiting failed, and detector was cut off commission for remainder of patrol.

— page 314 —
U.S.S. C.V. III, - Report of Sixth Patrol.

(e) Shortly after leaving Guam, forward engine room s-lt water shut down cooling pump developed a full voltage ground on the motor. Due to the inaccessible location of this pump and the prevailing low injection, no attempt was made to repair this motor.

(f) A great deal of trouble was experienced with rubber ferrules and grommets obtained in. ustrical. These were all replaced with the american product by the and cf the patrol.

2. TORPEDO AND GUNNERY

(a) 15 August - Routine daily inspection of the forward TBT revealed a zero ground reading on the rotor leads for the synchro generator on the bridge. The forward TBT circuit was left iscl:ted.

(b) While firing 20 MM ct a floating mine a jam occurred. Inspection revealed that an entire projectile had been forced into the barrel of the gun, past the extractor ring, without the primer igniting. Barrel was immediately removed from gun and discarded over the side.

(c) Before commencing first charge aboard, the level of the electrolytic of the Mk 27 torpedoes was found low the tops of the seperators, and barely covering the tops of the plates of all coils. Using ships battery water, the level of the electrolytic was brought up to 3/8" above the plates. No difficulty was obtained with these two batteries on charge. The level of electrolytic in the third Mk 27 was found to be normal. While aboard those batteries were under normal conditions, and a reason for low electrolytic level not evident.

(L) RADIO

No serious defects in any radio gear were encountered. All messages were received, and six transmissions were made. All of our transmissions were properly received for by MPY and ZSV. The following comments are submitted on our transmissions, which were sent to NPN:

(a) First Message on 7 August - 4235 Kes, eight minutes to transmit and get receipt for 70 group message, not necessary to repeat any groups.
(b) Second Message on 10 August - 12705 Kes, 8470 Kes was busy and 4235 Kes was unclassified, five minutes to transmit and get receipt for 72 group message, three groups had to be reported.

— page 315 —
3rd M.S.S. - Report of Sixth War Patrol.

Subject: U.S.S. C.V.III - Report of Sixth War Patrol.

(a) Third Message on 15 August - 12705 Kos, aircraft code, four minutes to transmit and get receipt for 18 group message which was reported twice.
(b) Fourth Message on 15 August - 12705 Kos, ten minutes to transmit and get receipt for 63 group message, six groups had to be reported. Twice we heard recopiting of other messages without proper authentication by a station which was above frequency. It appeared that the Japs were still practicing deception.
(c) Sixth Message on 22 August - 12705 Kos, seven minutes to transmit and get receipt for 60 group message, no groups had to be reported.

The following comments are submitted on lifeguard communication:

(c) 4475 Kos - no use to us on this patrol, although it was guarded at all times while on station. Dis-tant transmissions were heard, and the Japs used it for CV, probably for crowding the SR units off the air.
(b) SR circuit - transmissions easily read, two minutes and Okinawa. Plots frequently being heard. In fact, these plots often overlapped 7475 Kos.
(c) VHF, 140.58 Kos - excellent results. We used the VHF for a few hours and received in our C.P. from 25 miles in poor visibility.
(d) 514 Kos - it never became necessary to use this circuit for hours. The I.F. section of the TEL-12 was always set up for immediate use.

(M) R.D.R

1. SD R.D.R - Performance was good throughout the patrol. On 10 August echoes were below par and the plot current could not be raised above 8.0 m/s, without reciting. After lowering the frequency from 115.5 m/s to 113.7 m/s by adjusting the grid shorting bar, the response increased and the current could be raised as high as 16 m/s. At night it was necessary to run the SD on the 3M motor generator to avoid overloading the IO system. This caused double pulsing and variation in the intensity.

2. SJ R.D.R - The operation of this gear was very good. Following casualties occurred:

(a) 7 August - 2 hours disappeared with loss of a reetifier voltage. Trouble was traced to C21 in filament circuit.

— page 316 —
3. ST RADAR - The operation of this gear and the rest of the electronics gear was excellent.

(N) SONAR GEAR AND SOUND CONDITIONS

1. No casualties occurred to the sound gear. In our patrol area, heavy, negative gradients were encountered and sound conditions were usually poor. The waters off the East Coast of Honshu must be well stocked with fish, if the various and loud noises we heard on the sound gear are any indication.

(O) DENSITY LAYERS

| DATE  | TIME   | POSITION | R.M.KGS |
|-------||||
| 8/10/45| 0600 (H)| 28 - 45N | Isotherm: 1 to 100 feet; 6 negative to 300 feet. |
| 8/11/45| 0600 (K)| 32 - 52N | Isotherm: 1 to 120 feet; 10 negative to 140 feet; 7 negative to 300 feet. |
| 8/12/45| 0600 (K)| 36 - 36N | Isotherm: 1 to 120 feet; 8 negative to 130 feet; 10 negative to 300 feet. |
| 8/14/45| 0330 (K)| 37 - 42N | Isotherm: 1 to 100 feet; 12 negative to 150 feet. |
| 8/14/45| 1200 (K)| 36 - 00N | Isotherm: 1 to 100 feet; 12 negative to 150 feet. |
| 8/16/45| 0600 (K)| 35 - 29N | Isotherm: 1 to 80 feet; 12 negative to 120 feet; 8 negative to 200 feet. |
| 8/19/45| 0600 (K)| 39 - 18N | Isotherm: 1 to 60 feet; 20 negative to 120 feet; 3 negative to 300 feet. |
| 8/22/45| 0600 (K)| 38 - 58N | Isotherm: 1 to 55 feet; 20 negative to 100 feet; 10 negative to 300 feet. |

— page 317 —
22
Subject: U.S.S. C.V. VILLA - Report of Sixth Tar Patrol.

(P) HEALTH, FOOD AND BATHING

The health of the crew has been very good. There was one case of cellulitis left foot, one caterpillar fever acute, and one laceration forehead and nose, totalling only four sick days for the patrol. Habitability was excellent. A varied and good quality of food was obtained from the PROTUS while in Guam, the steaks particularly being appreciated, as we had just completed about nine months of subsistence on Australian beef.

(Q) PERSONNEL

The performance of duty of all hands was excellent. School of the boat was conducted by the non-cultified officers for the non-cultified men, which proved to be a highly satisfactory system.

(a) Number of men detached after previous patrol
(b) Number of men on board during patrol
(c) Number of men qualified at start of patrol
(d) Number of men qualified at end of patrol
(e) Number of uncultified men making their first patrol

(R) MILITARY SERVICE - TOTAL USED

| Military Service | Fuel | Provisions | Personnel |
||------|||
| Guam to Area   | 1615 | 17:330     | 21       |
| In Area        | 5680 | 60:000     | 11       |
| Rec to Pearl Harbor | 3535 | 47:190     | 2        |

(S) DURATION

Days enroute to Area (from Guam) | 6
Days in Area | 21
Days enroute to Base (Pearl Harbor) | 11
Days submerged | 2

(T) PICTURES OF INSTRUCTIONS

For peafoils
22
Fuel
36,000 gals.
Provisions
30 dcs.
Personnel
15 dcs.

Limiting factor this patrol - Orders

— page 318 —
150 megacycles per day was detected in the vicinity of 30°N, 140°E. It was a fairly strong signal sweeping every two minutes, and it is believed to be the radar located on Torii Shima. Characteristics: 150/1000/3.

(b) 105 megacycles per day was detected in the vicinity of 35-26N, 141-30E. This was probably the land-based unit on Inubo Saki. Characteristics: 105/1000/4.

(c) In the same locality as the radar in (b), a 145 megacycle per day was detected. The directional antenna indicated it was to be searched, so believe it was an aircraft radar. Characteristics: 145/10.0/6.

(d) 150 megacycles per day was detected in the vicinity of 37-50N, 143-16E. This radar was weak and hard to identify. A low pulse rate indicated that it might have been a land-based radar. Characteristics: 150/100/6.

2. No radar jamming was encountered.

3. No deceptive practices were employed by the enemy.

(B) CONTINUATION COUNTERS:

(a) After sending our fifth transmission to Conusubye on 16 August, an unknown operator asked for extensive corrections. Our challenge to the captainate was answered promptly, and the doctor finally gave up.

(b) 4475 kcs was used extensively for transmissions of Jap characters. Several times the Japs used nicknames as ells to break into plane to plne circuits, evidently in hopes of confusing communications.

(c) Before 15 August much conversation in Japanese was heard on Jaffin frequencies. The intent seemed to be to avoid the circuit.

(d) Our schedules were unusually clear, no effective jamming being encountered.

- 23 -

— page 319 —
U.S.S. CAVALLA - Report of Sixth Ver Petrol.

(C) SONAR COUNT: RM: 1, SURF: 3
None encountered.

(V) REMARKS:
All hands at one time or other had dreamed of steaming into Tokyo Bay at the end of this war, but few had even dared to hope that they might be present there for the signing of the Peace Treaty. It was a mighty big thrill for us all, and none of us could have desired a more fitting climax to this war.

— page 320 —
15-104/416-3(2)
Serial (051)
C-C-F-I-D-E-H-T-I-A-L
13 September 1945.

FIRST INDORSEMENT to CO USS CAVALLA
conf. 1tr. S324/416-3, dated
12 September 1945.

From: The Commander Submarine Division GWE HUDRED FOUR.
To: The Commander-in-Chief, United States Fleet.
Via: (1) The Commander Submarine Squadron TEI.
(2) The Commander Submarine Force, Pacific Fleet.
(3) The Commander-in-Chief, United States Pacific Fleet.

Subject: U.S.S. CAVALLA (33 ZAA) - Report of War Patrol Number SIX.

1. The SLATE War Patrol of the CAVALLA was uncertain in every contact except that it is noted that she was attacked by an aircraft at night on hour after receipt of instructions to "cease firing" terminating the war. Fortunately the bomb went wide.

2. It is fitting that this fighting ship should have been present at YOKOSUKA for the signing of the Surrender.

THOMAS M. DYKERS.

— page 321 —
11/1/1945
Care of Fleet Post Office
San Francisco, California.
15 September 1945.

PC5-10/A16-3
Serial: (0295)
CONFIDENTIAL

SECOND ENDORSEMENT to
U.S.S. CAVALLIA (SS244) -
Report of War Patrol
Number Six.

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. CAVALLIA (SS244) - Report of War Patrol
Number Six.

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

2. The Commander Submarine Squadron TEN congratulates
the Commanding Officer, officers and crew of the U.S.S. CAVALLIA
upon the completion of that vessel's Sixth War Patrol.

G.E. PETERSON.

— page 322 —
10 01436
Serial 02382
COORDINATOR:
THIRD ENDORSEMENT to
CAVALIA Report of
Sixth War Patrol.

COUSSEGA PATROL REPORT NO. 920
U.S.S. CAVALIA - SIXTH WAR PATROL.

Front:
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. CAVALIA (SS244) - Report of Sixth War Patrol
(5 August to 12 September 1945).

1. The sixth war patrol of the U.S.S. CAVALIA, under the command of
Commander H. J. Kessler, U. S. Navy, was conducted in waters east of Enshus.
2. No enemy shipping of any category was sighted hence no attacks were
made. Neither was there any demand for CAVALIA's services as a fighter.
3. The submarine was forced to submerge by the near approach of unidentified aircraft, but only once was she attacked. It is noteworthy that this
encounter was not a surprise, as the submarine was in a position to
receive the enemy's attack.
4. The number of the Submarine Combat Insignia for this patrol is not
authorized.
5. At the close of hostilities CAVALIA was selected as one of the submarine force, Pacific Fleet, is pleased that this opportunity could be offered to a submarine which in six war patrols, all made under the present commanding officer has inflicted significant damage on the enemy naval and merchant fleets.

G. C. CRAWFORD,
Chief of Staff.

DISTRIBUTION:
(Canceled Report)
(7) Conusbapea (3)
(5) Conusbapea and and (20)
(6) SUAD, HI (2)
(1) Conusbapea Subordena (3)
(1) All Squadron and Div.
(1) Cinelant (2)
(8) Conusbapea, Pacific (5)
(2) Conusbapea and (2)
(1) Substrainpce (2)
(1) All Submarines, Pacific (1)
(2) Conusbapea (1)
(1) Conusbapea (1)
(2) Conusbapea (1)
(2) Conusbapea (1)
(1) Conusbapea (1)
(