Events
On This Day - July 4
| 1776 | American independence | American colonies declare their independence from Great Britain |
| 1842 | Torpedo Test | First test of electrically operated underwater torpedo sinks gunboat Boxer |
| 1939 | Tetrarch (N 77) | Completed |
| 1939 | Thistle (N 24) | Completed |
| 1940 | Thames (N 71) | Cdr Denis Vaughan Sprague, RN, the Commanding Officer of Thames died at Devonport. In the early hours of Wednesday 3rd July 1940, all French Naval vessels at Plymouth were taken into Royal Navy control. The crew of the French Submarine Surcouf resisted the takeover and in the confusion, the Commander was shot, and he died later in hospital. |
| 1940 | Narwhal (N 45) | HMS Narwhal lays minefield FD 21 (50 mines) north of Kristiansund, Norway. |
| 1940 | Pandora (N 42) | Sinks the French colonial sloop Rigault de Genouilly off Algiers. |
| 1940 | Seawolf (N 47) | Landed agents on Ullers Island |
| 1941 | Torbay (N 79) | HMS Torbay sinks two German sailing vessels with gunfire in the Doro Channel. |
| 1942 | Turbulent (N 98) | While on patrol off Benghazi, Libya HMS Turbulent fires torpedoes at the Italian transport Nino Bixio and the German transport Ankara. The torpedoes miss. |
| 1942 | Tantivy (P 319) | Laid Down |
| 1943 | Trident (N 52) | HMS Trident sinks two sailing vessels with gunfire off Symi. |
| 1943 | Unseen (P 51) | While on patrol off Cape Rizzuto, Calabria, Italy, HMS Unseen fires four torpedoes against what is identified as an Italian Regolo-class light cruiser. All torpedoes missed. |
| 1944 | Sturdy (P 248) | HMS Sturdy sinks two Japanese tugboats and three barges with gunfire off the west coast of Siam. |
| 1944 | Vox (P 73) | HMS Vox torpedoes and sinks a German sailing vessel off Santorini Island, Greece. |
| 2014 | Ambush (S 120) | HMS Ambush left Faslane on July 4 to sail across the Equator to visit Rio de Janeiro in Brazil before heading for the North Atlantic and the United States. |
