| Born | 30 Sep, 1911 | Hamburg |
|
Ranks
Decorations |
Patrol info
| U-boat | Departure | Arrival | |||||
| 1. | U-370 | 9 Jun, 1944 | Kiel | 10 Jun, 1944 | Marviken | 2 days | |
| 2. | U-370 | 29 Jun, 1944 | Marviken | 1 Jul, 1944 | Kiel | 3 days | |
| 3. | U-370 | 9 Jul, 1944 | Kiel | 12 Jul, 1944 | Reval | Patrol, | 4 days |
| 4. | U-370 | 13 Jul, 1944 | Reval | 14 Jul, 1944 | Grand Hotel | Patrol, | 2 days |
| 5. | U-370 | 17 Jul, 1944 | Grand Hotel | 24 Jul, 1944 | Grand Hotel | Patrol, | 8 days |
| 6. | U-370 | 26 Jul, 1944 | Grand Hotel | 27 Jul, 1944 | Nord Altaskär | Patrol, | 2 days |
| 7. | U-370 | 28 Jul, 1944 | Nord Altaskär | 3 Aug, 1944 | Helsinki | Patrol, | 7 days |
| 8. | U-370 | 9 Aug, 1944 | Helsinki | 12 Aug, 1944 | Grand Hotel | Patrol, | 4 days |
| 9. | U-370 | 20 Aug, 1944 | Grand Hotel | 30 Aug, 1944 | Grand Hotel | Patrol, | 11 days |
| 10. | U-370 | 3 Sep, 1944 | Grand Hotel | 6 Sep, 1944 | Kopli | Patrol, | 4 days |
| 11. | U-370 | 13 Sep, 1944 | Kopli | 28 Sep, 1944 | Memel | Patrol, | 16 days |
| 12. | U-370 | 2 Oct, 1944 | Memel | 25 Oct, 1944 | Danzig | Patrol, | 24 days |
| 13. | U-370 | 5 Jan, 1945 | Danzig | 5 Mar, 1945 | Danzig | Patrol, | 60 days |
| 14. | U-370 | 7 Mar, 1945 | Danzig | 10 Mar, 1945 | Kiel | Patrol, | 4 days |
| 12 patrols, 146 days at sea | |||||||
Ships hit by Karl Nielsen
| Date | Boat | Name of ship | Tons | Nat. | Convoy | Fate * | |
| 31 Jul, 1944 | U-370 | MO-101 | 56 | | sj | ||
| 12 Jan, 1945 | U-370 | Louhi | 776 | | fi | ||
| 832 | |||||||
* 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.
