Patrol info for U-23
Date lookup for 18 Feb 1940
| Departure | Arrival / Fate | Duration | ||
| 9 Feb 1940 | Wilhelmshaven | 25 Feb 1940 | Wilhelmshaven | 17 days |
Commander | Officers * |
 Kptlt. Otto Kretschmer |
2WO Oblt. Hans-Diedrich Freiherr von Tiesenhausen |
Patrol in the North Sea off the Shetland and Orkney Islands. The boat participated in the operation Nordmark together with U-14, U-22, U-57, U-61 and U-63. The U-boats were placed off the British bases on the Shetland and Orkney Islands for reconnaissance during an unsuccessful sortie of the German battlecruisers Scharnhorst and Gneisenau, the heavy cruiser Admiral Hipper and three destroyers against the British convoys between Norway and Britain between 18 and 20 February.
U-23's position on 18 Feb 1940
Ships hit by U-23 on this date
| Date | U-boat | Commander | Name of ship | Tons | Nat. | Convoy | Map | ||
|---|---|---|---|---|---|---|---|---|---|
| 18 Feb 1940 | U-23 | Otto Kretschmer |  | HMS Daring (H 16) | 1,375 |  | br | HN-12 | A |
| 1,375 | |||||||||
1 ship sunk (1,375 tons). Legend | |||||||||
General Events during this patrol
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Attacks on U-23 during this patrol
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* These are officers that later became commanders themselves.