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

IJN Submarine RO-107:
Tabular Record of Movement

2001-2016 Bob Hackett & Sander Kingsepp

Revision 4

17 December 1941:
Kure. Laid down at Kure Navy Yard as a 525-ton Kaisho (KS) Type submarine No. 217.

8 April 1942:
Redesignated RO-107 and provisionally attached to Sasebo Naval District.

30 May 1942:
Launched and designated RO-107 .

10 October 1942:
LtCdr (Cdr, posthumously) Kobayashi Shigeo (56)(the current CO of I-171) is appointed Chief Equipping Officer of RO-106 and RO-107 as an additional duty.

10 December 1942:
Lt (Cdr, posthumously) Egi Shoichi (60)(former CO of RO-65) is appointed Chief Equipping Officer.

26 December 1942:
Completed, commissioned and attached to Sasebo Naval District. Lt Egi is the CO. Assigned to Kure SubRon.

15 March 1943:
Reassigned to Rear Admiral (later Vice Admiral) Harada Kaku's (former CO of CVS CHIYODA) SubRon 7 in Vice Admiral Mikawa Gunichi's (former CO of KIRISHIMA) Eighth Fleet/Southeast Area Fleet based at Rabaul.

31 March 1943:
Departs Sasebo for Rabaul.

12 April 1943:
Arrives at Rabaul.

22 April 1943:
Departs Rabaul to patrol E of Guadalcanal for her first war patrol.

14 May 1943:
Returns to Rabaul.

27 May 1943:
Departs Rabaul to patrol E of Guadalcanal on her second war patrol.

20 June 1943:
Returns to Rabaul.

30 June 1943: American Operation "TOENAILS" - The Invasion of New Georgia:
Rear Admiral (later Admiral) Richmond K. Turner's Third Fleet Amphibious Force, supported by land-based aircraft, lands Marines and Army troops on Rendova and other islands in the New Georgia area, Solomons.

That day, Lt Egi departs Rabaul to patrol off Rendova Island, Solomons, on RO-107's third war patrol.

6 July 1943:
RO-107's last message is received from the area E of Rendova.

1 August 1943:
Presumed lost with all 42 hands in the Solomons.

1 September 1943:
Removed from the Navy List.

Authors' Notes:
[1] RO-107 is usually listed as sunk by USS TAYLOR (DD-468) on 12 July 1943. In reality, TAYLOR crippled RO-101 during that attack.

Orita Zenji, the former IJN submarine skipper and author of the book "I-Boat Captain" has attributed the loss of RO-107 to USS RADFORD (DD-446) on 7 July 1943. Although the location is a good match, this is in all likelihood an error, since RADFORD's attack took place on 1 July.

Thanks go to Dr. Higuchi Tatsuhiro of Japan. Bob Hackett and Sander Kingsepp.

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