Patrol 1

21 Apr 1944 - 6 Jun 1944

No sinkings

Patrol 2

29 Jun 1944 - 18 Aug 1944

No sinkings

JANAC credits Gabilan with sinking the minesweeper W 25; however, this vessel was sunk by aircraft on 4 July 1944.

Patrol 3

31 Octl 1944 - 12 Nov 1944

Patrol 4

29 Dec 1944 - 15 Feb 1945

No sinkings

Patrol 5

20 Mar 1945 - 28 May 1945

Unidentified vessel sunk by gunfire - small vessel not credited to Gabilan in JANAC

五十鈴 Isuzu (credit for sinking shared with USS Charr (SS-328)

華宏丸 Kako Go (Kako Maru)

第一昭南丸 Shonan Maru No. 1 - small vessel not credited to Gabilan in JANAC

Patrol 6

20 Jun 1945 - 17 Aug 1945

No sinkings

Current research credits Gabilan with sinking 4 ships, totaling 7,549 tons, including Isuzu (credit shared with USS Charr in both JANAC and Alden) and a sub chaser (Shonan Maru No. 1 - which was not credited to Gabilan in JANAC), plus a small vessel of unknown tonnage sunk by gunfire and also not credited to Gabilan in JANAC. These figures do not include the minesweeper W-25 (mistakenly credited to Gabilan in JANAC). The figures are nearly identical for Alden-McDonald.

JANAC credits Gabilan with 3 ships sunk totalling 1,354 tons, plus shared credit for Isuzu. 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.

SORG credits Gabilan with 6 ships of 10,700 tons sunk, including 1 vessel with no tonnage listed..

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 Gabilan

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 - https://ja.wikipedia.org/wiki//グレイリング_(SS-209)

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

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.