Patrol 1

6 Jan 1944-29 Feb 1944

吉田丸 Yoshida Maru

大新丸 Taishin Maru

伊勢丸 Ise Maru - fishing vessel of 519 tons sunk by gunfire - not credited to Flasher in JANAC

Kanhoku Maru No. 2 - small vessel sunk by gunfire - not credited to Flasher in JANAC

民領丸 Minryo Maru

北安丸 Hokuan Maru

Patrol 2

4 Apr 1944-28 May 1944

Tahure (Vichy French) タユール

ソン・ジャン丸 Song Giang Maru

帝仙丸 Teisen Maru

Patrol 3

19 Jun 1944-7 Aug 1944

日邦丸 Nippo Maru

Severely damaged the 14,050-ton tanker Notoro

第二号興東丸 Koto Maru No. 2

大井 Oi

安芸丸 Aki Maru - credit for this sinking is shared with USS Crevalle (SS-291) in Alden, but not in JANAC

大鳥山丸 Otorisan (Otoriyama) Maru

東山丸 Tozan Maru - credit for this sinking is shared with USS Crevalle (SS-291) in Alden and in JANAC

Patrol 4

30 Aug 1944-20 Oct 1944

西貢丸 Saigon Maru

うらる丸 Ural Maru

大敏丸 Taibin (Daibin) Maru

Patrol 5

22 Nov 1944-2 Jan 1945

岸波 Kishinami

"Iwanami" (mistakenly credited to Flasher in JANAC - no destroyer of this name in IJN; probably second attack on Kishinami)

八紘丸 Hakko Maru

御室山丸 Omurosan Maru

音羽山丸 Otowasan Maru

ありた丸 Arita Maru

Patrol 6

29 Jan 1945-3 Apr 1945

黄浦丸 Koho Maru

Flasher probably also sank 3 small vessels by gunfire in partnership with USS Bashaw (SS-241) - totalling 250 tons

Current research credits Flasher with sinking 24 ships, 119,069 tons, including the fishing vessels Ise Maru and Kanhoku Maru No. 2, as well as two ships (Aki Maru and Tozan Maru) also credited to USS Crevalle (SS-291). These figures do not include "Iwanami" and the 3 small vessels sunk by gunfire on her 6th patrol.

JANAC - 21 ships, 100,231 tons, plus shared credit for Tozan (Tosan) Maru, and mistakenly including "Iwanami." JANAC does not credit Flasher with sinking Ise Maru, the small vessel Kanhoku Maru No. 2, and shared credit for sinking Aki Maru. 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 Flasher with 27 ships and tons sunk.

SORG credits Flasher with 24 ships and 149,300 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)

Archives of the Pacific Fleet Submarine Museum (PFSM)

War Patrol Reports - USS Flasher

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/

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.