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| U-870 | Type IXC/40 |
| Feldpost Number | M 49 432 |
| Construction Yard | Deutsche Schiff- und Maschinenbau AG, (AG Weser) Bremen |
| Yard Number | 1078 |
| Ordered | 25th Aug 1941 |
| Keel laid | 29th Apr 1943 |
| Launched | 29th Oct 1943 |
| Commissioned | 3rd Feb 1944 |
| Baubelehrung | 6.KLA, Bremen | | Training, Flotillas and Duties | | 02.44 - 09.44 | 4.U-Flottille, Stettin
Ausbildungsboot (under training)
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| 10.44 - 03.45 | 33.U-Flottille, Flensburg
Frontboot (operational)
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| Commanders | | 02.44 - 04.45 | KK Ernst Hechler |
| Operations information for U-870 | 31.10.1944 - 03.11.1944
First Sailing
U-870 left Kiel under the command of Ernst Hechler on 31st Oct 1944 and arrived at Horten on 3rd Nov 1944 after three days.
| 10.11.1944 - 20.02.1945
Second Sailing - active patrol
On the 10th Nov 1944, U-870 left Horten under the command of Ernst Hechler and after fourteen and a half weeks arrived at Kristiansand on 20th Feb 1945.
Ernst Hechler hit five ships on this patrol, three of these ships were in convoy: One was from convoy GC-107, one was from convoy GUS-63 and one was from convoy KMS-76.
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On 20th Dec 1944 he damaged the American 1,400 ton USS Fogg.
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On 20th Dec 1944 he sank the American 1,625 ton USS LST-359.
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On 3rd Jan 1945 he fatally damaged the American 7,207 ton Henry Miller, sailing with convoy GUS-63.
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On 9th Jan 1945 he sank the French 335 ton FFL LŽEnjoue, a member of convoy GC-107.
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On 10th Jan 1945 he fatally damaged the British 4,637 ton Blackheath, part of convoy KMS-76.
| 25.02.1945 - 27.02.1945
Third Sailing
U-870 departed under Ernst Hechler from Kristiansand on 25th Feb 1945 and arrived at Flensburg on 27th Feb 1945 after two days.
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