Events
On This Day - April 22
| 1909 | C27 | Launched |
| 1909 | C28 | Launched |
| 1943 | Saracen (P247) | HMS Saracen torpedoes and sinks the Italian merchant Tagliamento about 35 nautical miles south of Pianosa, Italy. |
| 1943 | Rorqual (N74) | HMS Rorqual lays 50 mines off Isola Favignana west of Sicily, Italy. |
| 1943 | Shalimar (P242) | Launched |
| 1944 | Sea Rover (P218) | HMS Sea Rover sinks a Japanese coaster with gunfire north of Sumatra. |
| 1944 | Taurus (P339) | HMS Taurus sinks the Japanese salvage vessel Hokuan I-Go and a tug with gunfire off Malaya. |
| 1944 | Shalimar (P242) | Completed |