| Born | 24 Nov, 1908 | Frankfurt |
| Died | 14 Oct, 1939 | North Atlantic |
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Ranks
Decorations |
U-boat Commands
| U-1 | 1 Oct, 1936 | - | 2 Feb, 1938 | No war patrols |
| U-45 | 25 Jun, 1938 | - | 14 Oct, 1939 (+) | 2 patrols (34 days) |
Patrol info
| U-boat | Departure | Arrival | |||||
| 1. | U-45 | 19 Aug, 1939 | Kiel | 15 Sep, 1939 | Kiel | Patrol, | 28 days |
| 2. | U-45 | 9 Oct, 1939 | Kiel | 14 Oct, 1939 | Sunk | Patrol, | 6 days |
| 2 patrols, 34 days at sea | |||||||
Ships hit by Alexander Gelhaar
| Date | Boat | Name of ship | Tons | Nat. | Convoy | Fate * | |
| 14 Oct, 1939 | U-45 | Bretagne | 10.108 |  | fr | KJF-3 | |
| 14 Oct, 1939 | U-45 | Lochavon | 9.205 |  | br | KJF-3 | |
| 19.313 | |||||||
* 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.