Events
On This Day - December 20
| 1914 | G9 | Laid Down |
| 1919 | 1907 - 1951: Lucia (F27) | Recommissioned |
| 1938 | Tribune (N76) | Launched |
| 1940 | Triton (N15) | Lost HMS Triton left Malta for a patrol in the lower Adriatic and the Straits of Otranto on 28th November 1940. At 0540 on 6th December an SOS from the Italian merchant vessel Olimpia was intercepted. Triton immediately set of to intercept her and seems to have made a successful attack before she was her self destroyed in a counter attack by two Italian Torpedo boats. There are also reports that the Italian Torpedo boat Clio may have sunk Triton. This attack is reported to have happened several days after Triton should have left the area and is therefore met with some scepticism |
| 1941 | WII | Britain declared war against Japan. |
| 1942 | Rorqual (N74) | HMS Rorqual lays 33 mines off Bizerte, Tunisia. |
| 1942 | Shakespeare (P221) | Launched |
| 1942 | Untamed (P58) | Launched |
| 1944 | 1927 - 1957: Alaunia (F17) | Sold to the Admiralty for conversion to a repair ship |
| 1981 | Tireless (S88) | Laid Down |
