Events
On This Day - March 31
| 1903 | Ambrose (F08) 1903 - 1946 | Launched |
| 1910 | C 37 (I 67) | Completed |
| 1910 | C 38 (I 68) | Completed |
| 1915 | F 1 (I A0) | Launched |
| 1919 | H 48 | Launched |
| 1919 | H 52 | Launched |
| 1919 | R 3 | Completed |
| 1940 | Sterlet (N 22) | HMS Sterlet ended her 6th war-patrol, returning to dock at Harwich. |
| 1941 | Rorqual (N 74) | HMS Rorqual torpedoed & sank the Italian submarine Pier Capponi south of Stromboli, Italy |
| 1941 | Upright (N 89) | HMS Upright torpedoes and damages the transport Galilea off Tripoli, Libya. |
| 1944 | Sportsman (P 229) | HMS Sportsman torpedoes and sinks the German sailing vessel Grauer Ort off Cape Maleas, Greece. |
| 1945 | Spark (P 236) | HMS Spark sinks a Japanese coaster with gunfire in the Flores Sea. |
| 1971 | Forth (F04) 1938 - 1978 | Left Singapore for the UK |
