U-boat patrols

Patrol info for U-107

DepartureArrival / FateDuration
29 Mar 1941Lorient2 Jul 1941Lorient96 days


Officers *

Kptlt. Günter Hessler

Oblt. Helmut Friedrich Witte

Daily positions, sinkings and allied attacks during the patrol of U-107

We have 91 daily positions for the 96 days U-107 was at sea.

Ships hit by U-107 during this patrol

Date U-boat Commander Name of ship Tons Nat. ConvoyMap
8 Apr 1941U-107Günter Hessler Eskdene3,829brOG-57A
8 Apr 1941U-107Günter Hessler Helena Margareta3,316brOG-57B
9 Apr 1941U-107Günter Hessler Harpathian4,671brOG-57C
9 Apr 1941U-107Günter Hessler Duffield8,516brD
21 Apr 1941U-107Günter Hessler Calchas10,305brE
30 Apr 1941U-107Günter Hessler Lassell7,417brOB-309F
17 May 1941U-107Günter Hessler Marisa8,029nlG
18 May 1941U-107Günter Hessler Piako8,286brH
27 May 1941U-107Günter Hessler Colonial5,108brOB-318I
28 May 1941U-107Günter Hessler Papalemos3,748grJ
31 May 1941U-107Günter Hessler Sire5,664brOB-320K
1 Jun 1941U-107Günter Hessler Alfred Jones5,013brOB-320L
8 Jun 1941U-107Günter Hessler Adda7,816brOB-323M
13 Jun 1941U-107Günter Hessler Pandias4,981grOG-63N

14 ships sunk (86,699 tons).

We have a picture of this vessel.

General Events during this patrol


29 Mar 1941. At 19:30 hrs on 29 March 1941 U-107 left Lorient, France under the command of Kptlt. Günther Hessler on what would become the most successful U-boat patrol of the entire war. She sailed with U-94, commanded by Kptlt. Kuppisch, but then U-107 turned south. Her area of operations was around the Canary Islands and nearby Freetown, where she sank 14 ships with a total of 86,699 tons. On 3 and 4 of May U-107 refuelled from the German supply ship Nordmark, together with U-105. Five days later U-107 transferred 14 torpedoes, food, water and more fuel from the supply ship Egerland. U-107 returned to Lorient on 2 July 1941. Kptlt. Hessler married Karl Dönitz's daughter Ursula in November 1937. At that time he was serving on torpedo boats, but he joined the U-boat force in April 1940. Because Hessler was his son-in-law, Dönitz felt uncomfortable about bestowing the Knights Cross his achievement entitled him to, and eventually Grand Admiral Raeder signed the papers.

9 May 1941. U-107 was supplied with 14 torpedoes and provisions by the German support ship Egerland, which was disguised as an American vessel. This is one reason why there were rumours after the war of American ships assisting U-boats.

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Attacks on U-107 during this patrol

We have no recorded attacks on U-107 duing this patrol.

If you believe we have omitted an attack on U-107 please let us know.

See all patrols for U-107

* These are officers that later became commanders themselves.

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