On 11 July 1943, Douglas, together with the destroyer and the frigate HMS Moyola K260 2 , were escorting a convoy consisting of the troopships Ship SS California 1923 2 and Ship SS Duchess of York 1928 2 and the munitions ship Ship MV Port Fairy 2 , when the convoy was attacked by three Focke-Wulf Fw 200 Condors of Kampfgeschwader 40 300 miles off Vigo.