Patrols by U-991
See the profile page for U-991
| Commander | Departure | Arrival | Days | |||||
| 1. | Oblt. Diethelm Balke | 5 Oct, 1944 | Kiel | 7 Oct, 1944 | Horten | 3 days | ||
| 2. | Oblt. Diethelm Balke | 11 Oct, 1944 | Horten | 12 Oct, 1944 | Kristiansand | 2 days | ||
| 3. | Oblt. Diethelm Balke | 15 Oct, 1944 | Kristiansand | 26 Dec, 1944 | Bergen | 73 days | P | View |
| 4. | Oblt. Diethelm Balke | 27 Dec, 1944 | Bergen | 29 Dec, 1944 | Marviken | 3 days | ||
| 5. | Kptlt. Diethelm Balke | 2 Jan, 1945 | Marviken | 4 Jan, 1945 | Flensburg | 3 days | ||
| 6. | Kptlt. Diethelm Balke | 20 Apr, 1945 | Kiel | 27 Apr, 1945 | Horten | 8 days | ||
| 7. | Kptlt. Diethelm Balke | 29 Apr, 1945 | Horten | 4 May, 1945 | Bergen, Norway | 6 days | ||
1 War patrol located. | ||||||||