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| HMS Thorn (N11) | |
|---|---|
| Ship name | HMS Thorn (N11) |
| Ship owner | Royal Navy |
| Ship operator | Royal Navy |
| Ship builder | Vickers-Armstrongs |
| Ship launched | 1938 |
| Ship in service | 1939 |
| Ship out of service | 1941 |
| Ship displacement | 1,090–1,350 tonnes |
| Ship length | 275 ft |
| Ship beam | 25 ft |
| Ship propulsion | Diesel engines; electric motors |
| Ship speed | 15–17 knots |
| Ship complement | 53 |
| Ship class | T-class submarine |
HMS Thorn (N11) was a T-class vessel of the Royal Navy commissioned on the eve of World War II. Built by Vickers-Armstrongs at Barrow-in-Furness, she served with the Home Fleet and in the Mediterranean Sea on offensive patrols against Axis shipping before being lost in 1941. Thorn's operational career exemplifies Royal Navy submarine operations during the early years of the Second World War.
Ordered under the 1936 Naval Programme, Thorn was laid down at Vickers-Armstrongs' Barrow-in-Furness yard, launched in 1938 and completed in 1939. As a member of the T-class, Thorn incorporated design features evolved from the Porpoise-class submarine predecessors and the L-class, emphasizing improved endurance for Pacific and European theatres. Construction drew on British naval architecture practices established by Admiralty specifications and the industrial resources of Clydeside and Tyne and Wear shipbuilding centres. Thorn's fitting-out included trials associated with Submarine Command Course procedures and sea acceptance tests watched by officials from the Admiralty and officers seconded from the Home Fleet.
Thorn's dimensions and performance reflected the standard T-class design: an approximate surfaced displacement of 1,090 tonnes and submerged displacement near 1,350 tonnes, an overall length around 275 feet and a beam near 25 feet. Propulsion comprised diesel engines for surface cruising and electric motors for submerged operations, enabling speeds up to 15–17 knots surfaced and around 9 knots submerged. Armament typically included ten 21-inch torpedo tubes and a 4-inch deck gun, aligning with Admiralty ordnance carried by contemporaries such as HMS Triumph (N18) and HMS Torbay (N79). Sensors and communications fitted included hydrophones and wireless telegraphy gear compatible with Royal Navy submarine flotilla standards and the signals procedures employed by Commander-in-Chief, Home Fleet directives.
Upon commissioning Thorn joined the Home Fleet's submarine flotillas for North Sea and Mediterranean operations. Early wartime deployments took her from Scapa Flow bases to patrol sectors off Norway and the North Sea before reassignment to the Mediterranean Sea to support operations related to the Battle of the Mediterranean and convoys linking Gibraltar and Alexandria. Thorn operated alongside other Royal Navy submarines in taskings coordinated by Admiralty instructions and supported larger campaigns including interdiction efforts coincident with Operation Compass and naval engagements linked to the Mediterranean Theatre of World War II.
Thorn conducted multiple offensive patrols targeting Axis merchant and naval vessels, engaging enemy convoys and auxiliary craft. Her patrols overlapped with wider Allied submarine activity that included actions by HMS Upholder (N99), commanded by Lieutenant Commander Malcolm Wanklyn, and operations affecting Axis supply lines serving Italian Libya and German Afrika Korps formations. Thorn recorded attacks on merchant shipping and laid in intercept positions intended to disrupt Axis logistics supporting operations around Tobruk and Bardia. These actions occurred amid intensified anti-submarine measures by Regia Marina escorts and Luftwaffe maritime patrol aircraft operating from bases in Sicily and Crete.
Thorn failed to return from a patrol in April 1941 while operating in the central Mediterranean; she was declared overdue and presumed lost. Contemporary assessments attributed her loss to anti-submarine action by Italian Navy surface vessels or air attack from Luftwaffe units, consistent with the heightened anti-submarine campaign driven by Axis forces during the period around the Siege of Malta and convoy battles such as the Mediterranean convoy battles. Post-war analysis of wartime records and action reports from Regia Marina and Luftwaffe archives has been inconclusive about the precise cause, leaving Thorn listed among Royal Navy submarines lost with all hands in the Second World War.
Thorn's complement numbered about 53 officers and ratings drawn from the Royal Navy Submarine Service and trained via the Submarine School and courses at HMS Dolphin. Commanding officers during her service included Royal Navy submarine commanders appointed under Admiralty brevet, whose careers intersected with other notable submariners serving in the Mediterranean Theatre of World War II. The loss of Thorn resulted in the death of her entire company, a fate shared with other submarines such as HMS Unique (N95) and HMS Olympus (N35), and is commemorated on naval memorials honoring those lost at sea including the Portsmouth Naval Memorial and Plymouth Naval Memorial.
Category:Royal Navy submarines Category:T-class submarines Category:World War II shipwrecks in the Mediterranean Sea