Heinz Sieder
Oberleutnant zur See (Crew 38)
| Successes 1 ship damaged for a total of 7.240 GRT 3 ships a total loss for a total of 21.550 GRT 1 warship a total loss for a total of 1.300 tons |
| Born | 28 Jun, 1920 | Munich |
| Died | 20 Aug, 1944 | Bay of Biscay |
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Ranks
Decorations
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Personal information
 Oblt. z. S.Heinz Sieder on board |
Heinz Sieder began his naval career in October 1938. During his officer training he served for seven months on the battleship Scharnhorst and took part in two patrols in the Atlantic.
In April 1941 he joined the U-boat force and after four months of training he became watch officer on a school boat (probably U-46) in the 26th Flotilla.
In January 1942 he became first watch officer on the newly commissioned U-440 and was on board for four patrols. He left U-440 in April 1943 (U-440 was lost a month later) and commissioned the Type VIIC U-boat U-984 in June 1943.
In January 1944 he was attached to the 9th Flotilla in Brest (France) and made some patrols in the Channel and in the Atlantic. During a patrol at the end of June 1944 he torpedoed a British destroyer and four US vessels.
U-984 was sunk with all hands on 20 August, 1944 in the Bay of Biscay west of Brest by depth charges from the Canadian destroyers HMCS Ottawa, Kootenay and Chaudiere.
Patrol info
| U-boat | Departure | Arrival | |||||
| 1. | U-984 | 30 Dec, 1943 | Kiel | 2 Jan, 1944 | Egersund | 4 days | |
| 2. | U-984 | 4 Jan, 1944 | Egersund | 24 Feb, 1944 | Brest | Patrol | 52 days |
| 3. | U-984 | 22 May, 1944 | Brest | 27 May, 1944 | Brest | Patrol | 6 days |
| 4. | U-984 | 6 Jun, 1944 | Brest | 10 Jun, 1944 | Brest | 5 days | |
| 5. | U-984 | 12 Jun, 1944 | Brest | 19 Jun, 1944 | St.Peter Port | 8 days | |
| 6. | U-984 | 21 Jun, 1944 | St.Peter Port | 5 Jul, 1944 | Brest | Patrol | 15 days |
| 7. | U-984 | 26 Jul, 1944 | Brest | 20 Aug, 1944 | Sunk | Patrol | 26 days |
Ships hit by Heinz Sieder
| Date | Boat | Name of ship | Tons | Nat. | Convoy | Fate * | |
| 25 Jun, 1944 | U-984 | HMS Goodson (K 480) | 1.300 |  | br | total loss | |
| 29 Jun, 1944 | U-984 | Edward M. House | 7.240 |  | am | EMC-17 | damaged |
| 29 Jun, 1944 | U-984 | H.G. Blasdel | 7.176 | | am | EMC-17 | total loss |
| 29 Jun, 1944 | U-984 | James A. Farrell | 7.176 | | am | EMC-17 | total loss |
| 29 Jun, 1944 | U-984 | John A. Treutlen | 7.198 | | am | EMC-17 | total loss |
| 30.090 | |||||||
* 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.