Type: IX-B
Built by: AG Weser (Bremen)
Launched: 2 July, 1940
Commissioned: 29 September, 1940
Feldpost Nr.: M34486
Sunk: 18 August, 1944
Sunk by: RAF Aircraft (201 Squadron)
Location sunk: West of La Rochelle
Position sunk: 46.46N x 03.39W (all hands 59 men, were lost)

Skippers of U-107 include Kplt. Gunther Hessler who went on to U-Boot- Staff & who was married to URSULA DONITZ, the daughter of GrossAdmiral Donitz (1339-1990); Oblt zS Harald Gelhaus (from 1 December 1941) who also commanded U-143; Oblt zS (later Kplt) Volker Simmermacher (from 27 May 1943); and by Oblt zS Karl-Heinz Fritz who was lost with the boat.

Another of the boats assigned to the well-known 2nd U-Boot-Flotille at Lorient, U-107 operated off Freetown (Sierra Leone West Africa) over April and May of 1941; again in October of 1941 and also in October of 1942. U-107 joined the rush to the East coast of the United States in May and June of 1942 where she operated off Cape Hatteras, the Florida coast and on into the Caribbean. In September of 1942 and in March of 1943, U-107 operated to the west of Gibraltar. She laid mines in the harbor at Charleston, South Carolina in August 1943 and in June 1944, operated off the NE coast of the United States.

U-107 took on fuel and supplies from the NORDMARK, which was disguised as the American ship SS PRAIRIE, over 3-4 May, 1941. She also took on provisions from EGERLAND over 9-11 May, 1941. U-107 was en route from Lorient to La Rochelle when she was sunk.

SHIPS SUNK BY U-107 UNDER HESSLER

03.02.41 EMPIRE CITIZEN Brit stmr 4,683 GRT
03.02.41 CRISPIN Brit stmr 5,051 GRT
06.02.41 MAPLECOURT Cana stmr 3,388 GRT
23.02.41 MANISTEE Brit stmr 5,360 GRT
(NOTE - this ship was an ocean boarding vessel, and was also attacked at the same time by the Italian submarine BIANCHI under CC Alberto Giovannini. The first torpedo from U-107 slowed the ship markedly, and it is not certain whether it was hit by BIANCHI. It took several attacks by U-107 before MANISTEE finally sank.
08.04.41 ESKDENE Brit stmr 3,829 GRT
08.04.41 HELENA MARGARETA Brit stmr 3,316 GRT
09.04.41 HARPATHIAN Brit stmr 4,671 GRT
09.04.41 DUFFIELD Brit tnkr 8,516 GRT
21.04.41 CALCHAS Brit stmr 10,305 GRT
30.04.41 LASSELL Brit mtrshp 7,417 GRT
17.05.41 MARISA Brit tnkr 8,029 GRT
18.05.41 PIAKO Brit stmr 8,286 GRT
27.05.41 COLONIAL Brit stmr 5,108 GRT
28.05.41 PAPALEMOS Grk stmr 3,748 GRT
31.05.41 GRAVELINES Brit stmr 2,491 GRT
01.06.41 ALFRED JONES Brit mtrshp 5,013 GRT
08.06.41 ADDA Brit stmr 7,816 GRT
13.06.41 PANDIAS Grk stmr 4,981 GRT
24.09.41 JOHN HOLT Brit stmr 4,975 GRT
24.09.41 LAFIAN Brit stmr 4,876 GRT
24.09.41 DIXCOVE Brit mtrshp 3,790 GRT

SHIPS SUNK BY U-107 UNDER GELHAUS

31.03.42 SAN ARCADIO Brit tnkr 7,419 GRT
06.02.42 MAJOR WHEELER Amer stmr 3,431 GRT
29.05.42 WESTERN HEAD Brit stmr 2,599 GRT
01.06.42 BUSHRANGER Pana stmr 4,536 GRT
07.06.42 CASTILLA Hond stmr 3,910 GRT
06.06.42 SUWIED Amer stmr 3,249 GRT
10.06.42 MERRIMACK Amer stmr 2,606 GRT
26.06.42 PEDRINHAM Braz stmr 3,666 GRT
03.09.42 HOLLINSIDE Brit stmr 4,172 GRT
03.09.42 PENROSE Brit stmr 4,393 GRT
07.10.42 ANDALUCIA STAR Brit stmr 14,943 GRT
22.02.43 ROXBOROUGH CASTLE Brit mtrshp 7,801 GRT
Able Seaman Harry Weeks made this report upon his rescue: ".....The same officer, whom we thought to be the Captain, then asked us in perfect English, did we have any injured, did we need any food and water, did we specially need anything at all. We thanked him and answered no to his questions. He then apologized for sinking us and told us how far it was to St Miguel, gave us a course to steer by, wished us good luck, and left. The U-Boat, which I have since learned was U-107, had a large painting of a charging bison on the fore part of her conning tower and on each side of the tower an equally large painting of four aces."

13.03.43 CLAN ALPINE Brit stmr 5,442 GRT
13.03.43 MARCELLA Brit stmr 4,592 GRT
13.03.43 OPORTO Brit stmr 2,352 GRT
13.03.43 SEMBILANGAN Neth stmr 4,990 GRT
01.05.43 PORT VICTOR Brit mtrshp 12,411 GRT

SHIPS DAMAGED BY U-107 UNDER GELHAUS

21.02.42 EDGA Norw tnkr 10,068 GRT

SHIPS DAMAGED BY U-107 UNDER SIMMERMACHER

11.09.43 ALBERT GALLATIN Amer stmr 7,176 GRT
11.09.43 RAPIDAN Amer tnkr 8,246 GRT
(NOTE - the ALBERT GALLATIN, which was escorted by BLIMP K-34, reported sighting three torpedo tracks. One hit but failed to detonate. RAPIDAN reported damage from a detonation near but not hitting the ship.)
10.06.43 MARIA AMELIA Port stmr 1,766 GRT
(NOTE - It was reported by B-Dienst that MARIA AMELIA was attacked but it is not certain whether this ship was hit during the attack on 10 June or a later attack on another unidentified ship on 13 June.