| 1917 | K2 | One member of the crew accidentally fell overboard and was drowned. He was Sto 1 Reginald Tinniswood. |
| 1918 | L55 | Launched |
| 1932 | 1911 - 1932: Adamant | Sold
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| 1942 | Unruffled (P46) | At 0105 hours HMS Unruffled sinks the Italian auxiliary minesweeper N 10/Aquila with gunfire off the Tunisian coast 8 nautical miles bearing 040 from Mehedia. |
| 1943 | Unseen (P51) | HMS Unseen torpedoes and sinks the German minelayer Brandenburg and the German nightfighter direction vessel Kreta about 7 nautical miles north-east of Isola di Capraia, Italy. |