On 8 April 1940, the German troop transport ship Fridenau left Gotenhafen, i.e. present-day Gdynia, to head for Oslo in Norway with troops, horses and vehicles and other equipment in the German convoy Seetransportstaffel 2, which also included Wigbert. Some submarine chasers and guard ships, including V-1507, accompanied the convoy as escort.

Two days later, on 10 April, the convoy was discovered off Marstrand just before 4 pm by the British submarine HMS Triton. At 4:26 pm, the submarine fired six torpedoes and Friedenau, Wigbert and V-1507 were sunk. 500 soldiers died on board Friedenau and 400 on board Wigbert as they quickly sank. From Marstrand and the other islands nearby, about ten ships were observed heading north and how three of the ships were torpedoed and one of them sank stern first and how one caught fire, after which the convoy dispersed. A heavy firefight was observed where depth charges were dropped on the submarine and several aircraft participated in the battle while survivors were picked up by fishing boats that had come out of the islands and several German ships.