| Born | 29 Mar, 1915 | Apenrade |
| Died | 23 Apr, 1945 | North Atlantic |
|
Ranks
Decorations |
U-boat Commands
| U-334 | 9 Oct, 1941 | - | 31 Mar, 1943 | 7 patrols (100 days) |
| U-396 | Mar, 1945 | - | 23 Apr, 1945 (+) | 1 patrol (42 days) |
Patrol info
| U-boat | Departure | Arrival | |||||
| 1. | U-334 | 18 Mar, 1942 | Kiel | 14 Apr, 1942 | Trondheim | Patrol, | 28 days |
| 2. | U-334 | 7 Jun, 1942 | Trondheim | 10 Jun, 1942 | Trondheim | Patrol, | 4 days |
| 3. | U-334 | 15 Jun, 1942 | Trondheim | 6 Jul, 1942 | Neidenfjord | Patrol, | 22 days |
| 4. | U-334 | 9 Jul, 1942 | Neidenfjord | 14 Jul, 1942 | Trondheim | Patrol, | 6 days |
| 5. | U-334 | 31 Oct, 1942 | Trondheim | 1 Dec, 1942 | Narvik | Patrol, | 32 days |
| 6. | U-334 | 2 Dec, 1942 | Narvik | 4 Dec, 1942 | Trondheim | Patrol, | 3 days |
| 7. | U-334 | 12 Dec, 1942 | Trondheim | 16 Dec, 1942 | Bergen | Patrol, | 5 days |
| 8. | U-396 | 13 Mar, 1945 | Trondheim | 23 Apr, 1945 | Sunk | Patrol, | 42 days |
| 8 patrols, 142 days at sea | |||||||
Ships hit by Hilmar Siemon
| Date | Boat | Name of ship | Tons | Nat. | Convoy | Fate * | |
| 4 Jul, 1942 | U-334 | William Hooper | 7.177 |  | am | PQ-17 | |
| 5 Jul, 1942 | U-334 | Earlston | 7.195 |  | br | PQ-17 | |
| 14.372 | |||||||
* Unless otherwise noted the ships listed here were sunk. | |||||||
Decorations and ranks information is in many cases not complete. If you can help on any of those missing that would be great.