 After brief exercises in the Clyde, "Trident" embarked on her first patrol under Hezlet's command to Norwegian waters, off Trondheim.Hezlet later recalled that his instructions were not to fire at anything but "Tirpitz", which had arrived at Trondheim on 13 March 1942, and that he consequently had a frustrating time watching hundreds of thousands of tonnes of unescorted shipping plying the coastal waters.That appears potentially open to doubt because patrol reports appear to indicate that Hezlet made two attacks against merchant ships during that patrol, one unsuccessful but the latter, on 20 April 1942, resulting in his sinking of the German merchant ship "Hödur", which he hit with two out of three torpedoes fired.