| Navy | The Royal Navy |
| Type | Submarine |
| Class | U |
| Pennant | P 56 |
| Built by | Vickers Armstrong (Newcastle-on-Tyne, U.K.) : Davey Paxman & Ricardo |
| Ordered | 12 Jul 1941 |
| Laid down | 18 Sep 1941 |
| Launched | 24 Sep 1942 |
| Commissioned | 2 Feb 1943 |
| Lost | 3 Oct 1943 |
| Loss position | |
| History | Most likely depth charged in Gulf of Genoa by the German UJ-2208/Alfred. HMS Usurper (Lt. David Roger Oakeley Mott, DSC, RN) had left Algiers on 24th September 1943 with instruction to patrol of La Spezia. On 3 October 1943 she was ordered to move to the Gulf of Genoa. No further contact was made and she failed to return to Algiers on 12 October 1943 as expected. The German anti-submarine vessel UJ-2208 reported attacking a submarine in the Gulf of Genoa on 3 October 1943 and it is believed that this may have been the Usurper. |
Commands listed for HMS Usurper (P 56)
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| Commander | From | To | |
| 1 | Lt. David Roger Oakeley Mott, DSC, RN | Nov 1942 | 3 Oct 1943 (+) |
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Noteable events involving Usurper include:
28 Apr 1943
HMS Usurper (Lt. D.R.O. Mott, DSC, RN) makes a torpedo attack on the German submarine U-467 in the Norwegian Sea. The target was not hit.
27 Jul 1943
HMS Usurper (Lt. D.R.O. Mott, DSC, RN) torpedoes and sinks the French Château Yquem (2536 GRT) 6 nautical miles south-west of Ajaccio, Corsica, France in position 42º04'N, 08º20'E. (see map)