target. On 6 November, Sturgeon fired two torpedoes at the Norwegian merchant ship . One torpedo hit, and Delfinus sank in position . Sturgeon returned to port on 9 November. From 28 November 1940 23 February 1941, Sturgeon conducted three uneventful patrols off Bergen, Stadlandet, and Lista, Norway. On 11 March, she departed Blyth for her nineteenth war patrol, assigned to various areas off Norway. She missed a merchant ship with two torpedoes on 20 March and returned to port on 27 March. Sturgeon conducted another uneventful patrol from 12 to 30 April. Bay of Biscay and Arctic patrols After conducting exercises off Dartmouth, Sturgeon departed Portsmouth on 22 May for a patrol in the Bay of Biscay. The patrol was uneventful, and she returned to Portsmouth on 10 June. Her next patrol, starting on 24 June, was aborted when Sturgeon developed a crack in her pressure hull, forcing her to go back to port on 25 June. After repairs, Sturgeon departed Portsmouth on 26 July 1941 for another patrol in the Bay of Biscay, her twenty-third since the beginning of the war. On 11 August, she ended her patrol in Holy Loch, and on the 15th she arrived at Troon for a refit. On 11 December 1941, she shifted back to Holy Loch, then to Scapa Flow on 27–29 December after training exercises. On 1 January 1942, Sturgeon sailed to Polyarny, northern Russia, arriving ten days later. On 17 January she departed Polyarny for a patrol off Norway, returning to Lerwick on 13 February. From there Sturgeon left for Holy Loch, then to Portsmouth, arriving on 19 March. On 23 March, she departed Portsmouth for her twenty-fifth patrol. She was to act as a beacon for the St Nazaire Raid, known as Operation Chariot. Having successfully completed her mission, Sturgeon ended her patrol in Holy Loch on 3 April. On 24 April 1942, Sturgeon departed Holy Loch for another patrol mission, in the Norwegian Sea, as an escort of Convoy PQ 15. She was damaged by friendly aircraft on 28 April and returned to Lerwick on 6 May. On 11 May, she shifted to Elderslie for repairs to her main battery. After passing through various British ports, Sturgeon arrived at Lerwick on 14 June. She left port on 25 June to provide protection for Convoy PQ 17, returning on 12 July. On 4 August, Sturgeon was ordered to patrol