Patrols by U-421
See the profile page for U-421
| Commander | Departure | Arrival | Days | |||||
| 1. | Oblt. Hans Kolbus | 6 Nov, 1943 | Kiel | 8 Jan, 1944 | Brest | 64 days | P | View |
| 2. | Oblt. Hans Kolbus | 19 Feb, 1944 | Brest | 1 Apr, 1944 | Toulon | 43 days | P | View |
2 War patrols (P) located. | ||||||||