 She carried out 14 patrols during World War II, operating as part of the 'Norwegian Section' of the 9th Submarine Flotilla at Dundee.On 19 April 1944, under CO Lt Valvatne RNoN, south east of Løten on the western Boknafjorden, near Stavanger, Norway, the submarine fired a salvo of four torpedoes.The target was the German Type VIIc U-boat at about range.