Patrol info for U-1
Date lookup for 4 Apr 1940
| Departure | Arrival / Fate | Duration | ||
| 4 Apr 1940 | Wilhelmshaven | 6 Apr 1940 | Lost | 3 days |
Commander | Officers * |
 KrvKpt. Jürgen Deecke |
Formed U-boat group 4 (Stavanger) together with U-4 for Operation Weseruebung, the German invasion of Denmark and Norway. The boat had to return to port shortly after its departure due to technical problems and went missing after leaving again on 6 April, probably lost the same day on a mine west of Helgoland. The loss of U-1 was not realized by the BdU until 21 April.
U-1's position on 4 Apr 1940
Ships hit by U-1 on this date
General Events during this patrol
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Attacks on U-1 during this patrol
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* These are officers that later became commanders themselves.