| Navy | The Royal Navy |
| Type | Sloop |
| Class | Banff |
| Pennant | Y 21 |
| Built by | Bethlehem Shipbuilding Corp. (Quincy, Massachusetts, U.S.A.) |
| Ordered | |
| Laid down | 23 May 1928 |
| Launched | 11 Oct 1928 |
| Commissioned | 12 May 1941 |
| End service | 27 Mar 1946 |
| Loss position | |
| History | Returned to the United States on 27 March 1946. Her recommissioning was cancelled and she was sold on 25 March 1948. Commanding Officers: Lt.Cdr. David Charles Kinloch, RN Lt.Cdr. Rider Stuart Abram, RN Lt.Cdr. Frederick Harold Thornton, DSC, RNR A/Lt.Cdr. Bernard Morland Skinner, RN |
| Former name | USCG Champlain |
Commands listed for HMS Sennen (Y 21)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt.Cdr. David Charles Kinloch, RN | Jun 1941 | 11 Nov 1941 |
| 2 | Lt.Cdr. Rider Stewart Abram, RN | 11 Nov 1941 | 12 Feb 1943 |
| 3 | Lt.Cdr. Frederick Harold Thornton, RNR | 12 Feb 1943 | 8 May 1945 |
| 4 | Lt. Bernard Morland Skinner, RN | 8 May 1945 | 16 Feb 1946 |
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Noteable events involving Sennen include:
19 May 1943
The German submarine U-954 was sunk in the North Atlantic south-east of Cape Farewell, Greenland in position 54º54'N, 34º19'W, by depth charges from the British frigate HMS Jed (Lt.Cdr. R.C. Freaker, DSO, RNR) and the British sloop HMS Sennen (Lt.Cdr. F.H. Thornton, DSC, RNR). (see map)