Patrols by U-103
See the profile page for U-103
| Commander | Departure | Arrival | Days | Tons | |||||
| 1 | KrvKpt. Viktor Schütze | 21 Sep 1940 | Kiel | 19 Oct 1940 | Lorient | 29 days | 23,976 | P | View |
| 2 | KrvKpt. Viktor Schütze | 9 Nov 1940 | Lorient | 12 Dec 1940 | Lorient | 34 days | 38,465 | P | View |
| 3 | KrvKpt. Viktor Schütze | 21 Jan 1941 | Lorient | 24 Feb 1941 | Lorient | 35 days | 33,464 | P | View |
| 4 | KrvKpt. Viktor Schütze | 1 Apr 1941 | Lorient | 12 Jul 1941 | Lorient | 103 days | 65,172 | P | View |
| 5 | Kptlt. Werner Winter | 10 Sep 1941 | Lorient | 9 Nov 1941 | Lorient | 61 days | 10,594 | P | View |
| 6 | Kptlt. Werner Winter | 3 Jan 1942 | Lorient | 1 Mar 1942 | Lorient | 58 days | 26,539 | P | View |
| 7 | Kptlt. Werner Winter | 15 Apr 1942 | Lorient | 22 Jun 1942 | Lorient | 69 days | 42,169 | P | View |
| 8 | Oblt. Gustav-Adolf Janssen | 21 Oct 1942 | Lorient | 29 Dec 1942 | Lorient | 70 days | 25,375 | P | View |
| 9 | Oblt. Gustav-Adolf Janssen | 7 Feb 1943 | Lorient | 26 Mar 1943 | Lorient | 48 days | P | View | |
| 10 | Kptlt. Gustav-Adolf Janssen | 24 Apr 1943 | Lorient | 26 May 1943 | Lorient | 33 days | P | View | |
| Kptlt. Gustav-Adolf Janssen | 25 Jul 1943 | Lorient | 26 Jul 1943 | Lorient | 2 days | ||||
| 11 | Kptlt. Gustav-Adolf Janssen | 18 Sep 1943 | Lorient | 1 Jan 1944 | Bergen | 106 days | P | View | |
| Kptlt. Gustav-Adolf Janssen | 3 Jan 1944 | Bergen | 7 Jan 1944 | Kiel | 5 days | ||||
| 646 days | 265,754 | ||||||||
11 War patrols (P) located. 646 days at sea during patrols (653 days at sea overall). War patrols are shown with grey background. Tons indicate tonnage of ships sunk or damaged during the patrol, if any. Warships are included. | |||||||||
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