Patrols by U-40
See the profile page for U-40
| Commander | Departure | Arrival | Days | |||||
| 1. | Werner von Schmidt | 19 Aug, 1939 | Wilhelmshaven | 18 Sep, 1939 | Wilhelmshaven | 31 days | P | View |
| 2. | Kptlt. Wolfgang Barten | 10 Oct, 1939 | Wilhelmshaven | 13 Oct, 1939 | Sunk | 4 days | P | View |
2 War patrols (P) located. | ||||||||