Patrol 1

19 Nov 1941 - 31 Dec 1941 (began as a practice patrol)

No ships sunk

On 10 December 1941, Triton fired the first U.S. torpedoes of the War in the Pacific against a Japanese ship, but the vessel was not sunk.

Patrol 2

25 Jan 1942 - 18 Mar 1942

第五信洋丸 Shinyo Maru No. 5

昭久丸 Shokyu Maru

Patrol 3

12 Apr 1942-4 Jun 1942

Note that JANAC credits Triton with sinking an "Unknown Maru" of 1,000 tons on 23 Apr 1942, According to Alden, the ship that Triton attacked was Shinko Maru No. 5, which was damaged but not sunk.

甲谷陀 (かるかった丸) Calcutta Maru

大栄丸 Taiei Maru

大元丸 Taigen Maru

幸圓丸 Koen Maru No. 3 - small vessel sunk by gunfire, not credited to Triton in JANAC

改栄丸 Kaiei Maru - small vessel sunk by gunfire, not credited to Triton in JANAC

伊-64 (伊-164) I-64 (I-164) (renamed)

Patrol 4

25 Jun 1942 - 7 Sep 1942

子日 Nenohi

Patrol 5

16 Dec 1942 - 26 Jan 1943

第1天草丸 Amakasu Maru No. 1

近江丸 Omi Maru

Patrol 6

16 Feb 1943 - 15 Mar 1943 (assumed date of loss)

桐葉丸 Kiriha Maru

USS Triton was lost on this patrol.

Current research credits Triton with sinking 12 ships, totaling 31,066 tons, including 2 small ships not credited to Triton in JANAC, but not including the "Unknown Maru" of 1,000 tons that is credited to Triton in JANAC.

JANAC credits Triton with 11 ships sunk totalling 31,788 tons, including an "Unknown Maru" of 1,000 tons. Note that the criteria JANAC used included all Japanese Naval vessels (although JANAC did not usually count warships less than 500 tons that were converted from merchant ships) and all Japanese merchant vessels of 500 or more gross tons known or believed to have been lost during the war. Differences between JANAC figures and current research are noted above.

Alden-McDonald credit Triton with 12 ships and 31,059 tons sunk. Alden identifies the "Unknown Maru" listed in JANAC as Shinko Maru #5, a picket boat that was damaged but not sunk by gunfire from Triton.

SORG credits Triton with 16 ships and 64,600 tons sunk.

Japanese Naval and Merchant Ship Losses - JANAC on the NHHC website

JANAC on the Hyperwar website - https://www.ibiblio.org/hyperwar/Japan/IJN/JANAC-Losses/JANAC-Losses-6.html

SORG- http://archive.hnsa.org/doc/subreports-sorg.htm (Excel spreadsheet download)

SORG on combinedfleet.com

Archives of the Pacific Fleet Submarine Museum (PFSM)

War Patrol Reports - USS Triton

Monthly Losses of Combatant and Non-Combatant Vessels

太平洋戦争時の喪失船舶明細表（汽船主体）- Lost Vessel table during the Pacific War (merchant vessels)

Alden, John D., and McDonald, Craig R. - U.S. & Allied Sub Successes in the Pacific & Far East during WWII - Fourth Edition, 2009

Cressman, Robert - The Official Chronology of the U.S. Navy in World War II, Naval Institute Press, 2000.

Wrecksite - https://www.wrecksite.eu/wrecksite.aspx

Miramar Ship Index - https://www.miramarshipindex.nz/

Imperial Japanese Navy Page - http://www.combinedfleet.com/

Wikipedia Japan

Japan Center for Asian Historical Records - National Archives of Japan - https://www.jacar.go.jp/index.html

Official U.S. Navy Photos - Naval History & Heritage Command

PigBoats.com

Archives of the Pacific Fleet Submarine Museum (PFSM)

Imperial Japanese Navy Page - http://www.combinedfleet.com/

Japanese Merchant Ship photos - Wrecksite - copyright owners retain all rights. Photos used on this site will be taken down should the owner request their removal.

Note on the painting above: The original painting was done by McClelland Barclay in 1943. This similar version is from submarinesailor.com, artist unidentified.