Patrol 1

14 Apr 1942-12 Jun 1942

瑞穂 Mizuho

昭南丸 Shonan Maru

喜多方丸 Kitakata Maru

Note that JANAC credits Drum with an "Unknown" cargo ship of 4,000 tons sunk on May 9, 1942. Research shows that this ship, identified as 西寧丸 (Nishinei (?) Maru) in Japanese sources, was attacked but not hit.

Patrol 2

10 Jul 1942-2 Sep 1942

No Sinkings

Patrol 3

23 Sep 1942-8 Nov 1942

へいぐ丸 Hague Maru

八幡山丸 Hachimansan Maru or Yawatasan Maru

隆南丸 Ryunan Maru

Patrol 4

29 Nov 1942-24 Jan 1943

Patrol 5

24 Mar 1943-13 May 1943

雄山丸 Oyama Maru

日春丸 Nisshun Maru

Patrol 6

7 Jun 1943-26 Jul 1943

妙高丸 Myoko Maru

Patrol 7

16 Aug 1943-5 Oct 1943

Patrol 8

2 Nov 1943-5 Dec 1943

Patrol 9

9 Apr 1944-31 May 1944

Patrol 10

24 Jun 1944-14 Aug 1944

Patrol 11

9 Sep 1944-8 Nov 1944

信貴山丸 Shikisan Maru

大彰丸 Daisho Maru

大彰丸 Daihaku Maru (total loss)

Patrol 12

7 Dec 1944-17 Jan 1945

Patrol 13

11 Feb 1945-2 Apr1945

Patrol 14

8 Aug 1945-end of hostilities

14 ships, 78,601 tons, including Daihaku Maru (total loss), plus one small vessel of approximately 25 tons often not included in sinkings.

JANAC - 15 ships, 80,580 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 Drum with 14 ships and 78,601 tons sunk, plus one small vessel of approximately 25 tons.

SORG credits Drum with 19 ships and 111,100 tons sunk, plus one sampan of unknown tonnage.

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 -

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)

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.