Patrol info for U-31
| Departure | Arrival / Fate | Duration | ||
| 16 Sep 1940 | Wilhelmshaven | 8 Oct 1940 | Lorient | 23 days |
Commander | Officers * |
 Kptlt. Wilfried Prellberg |
Daily positions, sinkings and allied attacks during the patrol of U-31
We have 22 daily positions for the 23 days U-31 was at sea.
Departure from Wilhelmshaven on 16 Sep 1940.
17 Sep 1940 - 18 Sep 1940 - 19 Sep 1940 - 20 Sep 1940 - 21 Sep 1940 - 22 Sep 1940 - 23 Sep 1940 - 24 Sep 1940 - 25 Sep 1940 - 26 Sep 1940 - 27 Sep 1940 - 28 Sep 1940 - 29 Sep 1940 - 30 Sep 1940 - 1 Oct 1940 - 2 Oct 1940 - 3 Oct 1940 - 4 Oct 1940 - 5 Oct 1940 - 6 Oct 1940 - 7 Oct 1940 -
Arrival at Lorient on 8 Oct 1940.
Ships hit by U-31 during this patrol
| Date | U-boat | Commander | Name of ship | Tons | Nat. | Convoy | Map | ||
|---|---|---|---|---|---|---|---|---|---|
| 22 Sep 1940 | U-31 | Wilfried Prellberg |  | Union Jack | 81 |  | fa | A | |
| 27 Sep 1940 | U-31 | Wilfried Prellberg | | Vestvard | 4,319 |  | nw | OB-218 | B |
| 4,400 | |||||||||
2 ships sunk (4,400 tons). Legend | |||||||||
General Events during this patrol
1940
28 Sep 1940. An enemy submarine was sighted by U-31. U-31 dived and heard a torpedo running which missed.
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Attacks on U-31 during this patrol
30 Sep 1940
An unknown enemy submarine fired two torpedoes at U-31 at 03.16 hours. The boat escaped by the narrowest of margins.
8 Oct 1940
U-31 evaded a spread of four torpedoes fired by HMS Trident about 15 miles (24 km) south of Lorient and was then forced to dive when fired on by her deck gun. Trident followed up with some explosive charges, but without result. This was the third time that U-31 had been attacked by an enemy submarine on this patrol. The commander wrote sardonically in the war diary: "Main task of this patrol was to play the target ship for British submarines.".
About this data
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See all patrols for U-31
* These are officers that later became commanders themselves.