| Navy | The Royal Navy |
| Type | ASW Trawler |
| Class | Dog |
| Pennant | T 10 |
| Built by | Henry Robb Ltd. (Leith, U.K.) |
| Ordered | 27 Jan 1937 |
| Laid down | |
| Launched | 17 Feb 1938 |
| Commissioned | 16 May 1938 |
| Lost | 20 Nov 1939 |
| History | On 20 November 1939 HMT Mastiff (Lt.Cdr. Aymé Arthur Carrington Ouvry, RN) was engaged in the recovery of a mine, which had broken loose from a field laid on the night of 18/11 by German DDs Wilhelm Heidkamp, Hermann Künne and Bernd von Arnim. In the process of hauling it aboard, the mine detonated, destroying the trawler. 5 crew are missing presumed dead, 1 died of wounds and a further 9 are wounded. |
Commands listed for HMS Mastiff (T 10)
Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.
| Commander | From | To | |
| 1 | Lt.Cdr. Aymé Arthur Carrington Ouvry, RN | Aug 1939 | 20 Nov 1939 |
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