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| U-857 | Type IXC/40 |
| Feldpost Number | M 52 607 |
| Construction Yard | Deutsche Schiff- und Maschinenbau AG, (AG Weser) Bremen |
| Yard Number | 1063 |
| Ordered | 5th Jun 1941 |
| Keel laid | 16th Nov 1942 |
| Launched | 25th May 1943 |
| Commissioned | 16th Sep 1943 |
| Baubelehrung | 6.KLA, Bremen | | Training, Flotillas and Duties | | 09.43 - 05.44 | 4.U-Flottille, Stettin
Ausbildungsboot (under training)
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| 06.44 - 09.44 | 10.U-Flottille, Lorient
Frontboot (operational)
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| 10.44 - 04.45 | 33.U-Flottille, Flensburg
Frontboot (operational)
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| Commanders | | 09.43 - 04.45 | OL ~ KL Rudolf Premauer |
| Operations information for U-857 | 09.05.1944 - 13.08.1944
First Sailing - active patrol
U-857 left Kiel under the command of Rudolf Premauer on 9th May 1944 and arrived at Bordeaux on 13th Aug 1944 after more than thirteen weeks.
| 25.08.1944 - 11.10.1944
Second Sailing - active patrol
On the 25th Aug 1944, U-857 left Bordeaux under the command of Rudolf Premauer and after more than six weeks arrived at Flensburg on 11th Oct 1944.
| 17.10.1944 - 19.10.1944
Third Sailing
U-857 departed under Rudolf Premauer from Flensburg on 17th Oct 1944 and arrived at Hamburg on 19th Oct 1944 after two days.
| 01.12.1944 - 01.12.1944
Fourth Sailing
U-857 left Hamburg under the command of Rudolf Premauer on 1st Dec 1944 and arrived at Kiel on the same day.
| 30.01.1945 - 02.02.1945
Fifth Sailing
On the 30th Jan 1945, U-857 left Kiel under the command of Rudolf Premauer and arrived at Horten on 2nd Feb 1945 after three days.
| 06.02.1945 - 07.04.1945
Sixth Sailing - active patrol
U-857 departed under Rudolf Premauer from Horten on 6th Feb 1945. On the 7th Apr 1945, U-857 was sunk.
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