During World War II HMS Castleton saw active duty in the North Atlantic as a convoy escort. In November 1940 she picked up all the survivors of two torpedoed steamships, Daydawn and Victoria. She was damaged by an explosion 19 November 1941 and was out of action, under. going repairs, until 20 April 1942. On 20 August 1942 she and HMS Newark captured 51 survivors of the German submarine U-464 who had taken refuge in an Icelandic trawler. HMS Castleton was reduced to reserve at Grangemouth, Scotland, 13 March 1945 until sold for scrap on 4 Mar, 1947 at Bo'ness.