(KS type RO-109 scanned from "Submarines of the Imperial Japanese Navy" by Polmar and Carpenter)

IJN Submarine RO-112:
Tabular Record of Movement

© 2001-2011 Bob Hackett & Sander Kingsepp
Revision 2

20 June 1942:
Kobe. Laid down at Kawasaki Jyuko, K.K. as a 525-ton Kaisho (KS) Type submarine.

25 March 1943:
Launched as RO-112.

25 July 1943: Lt (later Cdr, posthumously) Kondo Fumitake (62)(former CO of RO-63) is posted Chief Equipping Officer.

15 September 1943:
Completed and attached to the Kure Naval District. Assigned to SubRon 11 for working-up. LtCdr Kondo is the Commanding Officer.

25 December 1943:
Reassigned to Captain Oyama Toyojiro’s SubDiv 30 of Vice Admiral, the Baron, Samejima Tomoshige's (former CO of NAGATO) Eighth Fleet/Southwest Area Fleet.

26 December 1943:
Departs Kure for Surabaya.

1 January 1944:
SubDiv30 is transferred to Rear Admiral (later Vice Admiral) Ichioka Hisashi's (former CO of CL KATORI) SubRon 8 of Vice Admiral (Admiral, posthumously) Takagi Takeo's (former CO of MUTSU) Sixth Fleet (Submarines).

19 January 1944:
Departs Surabaya on her first war patrol to patrol off the coast of Australia.

Mid-February 1944:
Returns to Surabaya.

Early March 1944:
Departs Surabaya on her second war patrol.

19 March 1944:
Bali, Netherlands East Indies. At 1138, LtCdr Willard Laughon's USS RASHER (SS-269), on patrol off Cape Bungkulan, sights a black surfaced submarine - probably RO-112 - at 4,000 yards. The Officer of the Deck identifies it as a "RO-51 Type". At 1149, Laughton fires his four stern torpedoes at the target but they are seen. The Japanese submarine changes course to port and RASHER's torpedoes miss. RASHER, herself now in danger, pulls away at flank speed.

20 March 1944:
Reassigned to SubDiv 51 of SubRon 7, Sixth Fleet.

25 March 1943:
Returns to Surabaya.

11 April 1944:
Departs Surabaya for Saipan.

20 April 1944:
Arrives at Saipan.

24 April 1944:
Departs Saipan on her third war patrol to an area N of New Guinea.

29 April 1944:
Reassigned to B patrol unit. Redirected to the area S of Meleyon.

1 May 1944:
Lt Kondo is promoted LtCdr.

6 May 1944:
Returns to Saipan.

15 May 1944:
The RO-112 departs Saipan on her fourth war patrol to form a picket line with RO-104, RO-105, RO-106, RO-108, RO-109 and RO-116 to warn of American invasion forces approaching the Palaus.

18 May 1944:
The U. S. Navy's Fleet Radio Unit Pacific (FRUPAC) intercepts radio traffic that indicates the Japanese have established a new submarine picket "NA line" between Truk and the Admiralty Islands to intercept American carriers. LtCdr Walton B. Pendelton's USS ENGLAND (DE-635) departs from Purvis Bay, Florida Island in the Solomons with USS RABY (DE-698) and GEORGE (DE-697) as a hunter-killer group to attack the NA line.

27 May 1944:
The Sixth Fleet decodes American signals that indicate that several submarines of the NA line have been sunk. The Japanese flash a warning message. LtCdr Kondo moves RO-112 to a new position 100 miles NW.

8 June 1944:
Arrives at Truk.

14 June 1944:
Departs Truk on her fifth war patrol in the Philippine Sea.

27 June 1944:
Returns to Truk.

7 July 1944:
Departs Truk for Yokosuka.

17 July 1944:
Arrives at Yokosuka, later transferred to Kure.

5 August 1944:
Lt Matsushima Shigeo (66) assumes command. LtCdr Kondo is reassigned as the CO of I-41 on which he is KIA in Nov '44.

15 August 1944:
SubDiv 51 is disbanded. RO-112 is reassigned to Kure SubRon as a training vessel.

31 August 1944:
Lt Sakamoto Doni (67) assumes command. Lt Matsushima is reassigned as CO of I-369 that is under construction at the Yokosuka Navy Yard.

25 September 1944:
The RO-112 is reassigned to SubDiv 33.

13 October 1944: Operation "SHO-I-GO" - The Defense of the Philippines:
Admiral Toyoda Soemu, CINC, Combined Fleet, orders the SHO-I-GO plan activated.

14 October 1944:
Lt Uesugi Kazuo (63)(former CO of RO-109) assumes command.

20 October 1944: American Operation "KING TWO" - The Invasion of Leyte, Philippines:
Admiral (later Fleet Admiral) William F. Halsey's Third Fleet of 738 ships including 18 aircraft carriers, six battleships, 17 cruisers, 64 destroyers and over 600 support ships land the Army's X Corps (24th Infantry and 1st Cavalry Divisions) and the XXIV Corps (7th, 77th and 96th Infantry Divisions) that begins the campaign to retake Leyte.

That day, RO-112 is reassigned to SubDiv 34, directly subordinated to C-in-C, Combined Fleet.

23 October 1944:
Departs Kure with RO-109 to patrol E of the Philippines on her sixth war patrol. Reassigned to B patrol unit.

21 November 1944:
Arrives at Mako, Pescadores.

30 November 1944:
Departs Mako for Lamon Bay, Philippines on her seventh war patrol.

28 December 1944:
Arrives at Kure.

5 January 1945:
Lt Toji Jun (66)(former CO of RO-109) assumes command. LtCdr Uesugi later becomes the CO of I-203, a new Sen Taka-class high-speed submarine.

9 January 1945: American Operation "MIKE ONE" - The Invasion of Luzon:
Lingayen Gulf, Philippines. Vice Admiral (later Admiral) Thomas C. Kinkaid's Task Force 77 lands almost 175,000 men of General Walter Krueger's Sixth Army under cover of heavy gunfire from Vice Admiral (later Admiral) Jesse B. Oldendorf's Task Group 77. 2 bombardment force and aircraft of Rear Admiral (later Vice Admiral) Calvin T. Durgin's Task Group 77. 4. In a five-month campaign, the Sixth Army defeats General Yamashita Tomoyuki's 14th Army Group defenders.

22 January 1945:
Departs Kure to patrol W of Luzon, Philippines.

4 February 1945:
Vice Admiral Miwa orders RO-115, RO-46, RO-112 and RO-113 to prepare to participate in the evacuation of the stranded pilots from the Aparri area on Luzon, Philippines. All above submarines are also ordered to land their deck gun ammunition and reserve torpedoes at Takao prior to the rescue mission.

7 February 1945:
Arrives at Takao, Formosa.

9 February 1945:
Departs Takao, Formosa for Batulinao, Luzon, Philippines to evacuate stranded pilots and return them to Takao.

11 February 1945:
Camiguin Island, Luzon Strait, Philippines. At 1951, Cdr John K. Fyfe's USS BATFISH (SS-310) SJ radar picks up a contact at 8,000 yards, bearing 310 degrees. BATFISH's AN/APR-1 radar detector also detects radar emissions. At 2037, BATFISH makes visual contact on a submarine running on the surface at 1,300 yards. At 2043, contact is broken as the target submerges.

At 2105, BATFISH's soundman hears a submarine blowing tanks. At 2106, the RO-112 surfaces again. BATFISH again detects radar emissions and her SJ radar makes contact at 8,650 yards, bearing 018 degrees. Cdr Fyfe closes the range to the target for the next hour.

At 2150, with the range down to 6,000 yards, Fyfe dives to radar depth. At 2202, at 880 yards, he fires four bow torpedoes set to run at four feet on a 100 degree starboard track using a 1 knot speed spread. The first torpedo hits and disintegrates the submarine - probably RO-112. She sinks almost immediately with all hands at 18-53N, 121-50E.

16 February 1945:
FRUMEL decodes the following message timed 171827: "Submarines RO-112 and RO-113 left Takao on 9th and and 10th respectively and were due to arrive at Batulinao on 12th and 14th. RO-115 has not yet returned to Takao from her operating area."

20 February 1945:
Presumed lost in the Luzon Strait with all 61 hands. Lt Toji is posthumously promoted LtCdr.

10 May 1945:
Removed from the Navy List.

Authors' Note:
Special thanks for assistance in researching the IJN officers mentioned in this TROM go to Mr. Jean-François Masson of Canada. Thanks also go to Dr. Higuchi Tatsuhiro of Japan.

– Bob Hackett and Sander Kingsepp.

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