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| U-1221 | Type IXC/40 |
| Feldpost Number | M 55 188 |
| Construction Yard | Deutsche Werft AG, Hamburg-Finkenwärder |
| Yard Number | 384 |
| Ordered | 25th Aug 1941 |
| Keel laid | 28th Oct 1942 |
| Launched | 26th May 1943 |
| Commissioned | 11th Aug 1943 |
| Baubelehrung | 8.KLA, Hamburg | | Training, Flotillas and Duties | | 08.43 - 06.44 | 4.U-Flottille, Stettin
Ausbildungsboot (under training)
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| 07.44 - 11.44 | 10.U-Flottille, Lorient
Frontboot (operational)
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| 12.44 - 04.45 | 33.U-Flottille, Flensburg
Frontboot (operational)
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| Commanders | | 08.43 - 01.44 | OL Karl Kölzer
see also: U-2 |
| 01.44 - 04.45 | OL Paul Ackermann |
| Operations information for U-1221 | 08.08.1944 - 10.08.1944
First Sailing
U-1221 left Kiel under the command of Paul Ackermann on 8th Aug 1944 and arrived at Horten on 10th Aug 1944 after two days.
| 14.08.1944 - 17.08.1944
Second Sailing
On the 14th Aug 1944, U-1221 left Horten under the command of Paul Ackermann and after three days arrived at Bergen on 17th Aug 1944.
| 20.08.1944 - 28.11.1944
Third Sailing - active patrol
U-1221 departed under Paul Ackermann from Bergen on 20th Aug 1944 and arrived at Marviken on 28th Nov 1944 after over fourteen weeks.
| 01.12.1944 - 05.12.1944
Fourth Sailing
U-1221 left Marviken under the command of Paul Ackermann on 1st Dec 1944 and after four days arrived at Flensburg on 5th Dec 1944.
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