HMS Decoy was a D-class destroyer of the Royal Navy. Ordered in 1931, the ship was constructed by John I. Thornycroft & Company, and entered naval service in 1933. Decoy was initially assigned to the Mediterranean Fleet before she was transferred to the China Station in early 1935. She was temporarily deployed in the Red Sea during late 1935 during the Abyssinia Crisis, before returning to her duty station where she remained until mid-1939. Decoy was transferred back to the Mediterranean Fleet just before the Second World War began in September 1939. She briefly was assigned to West Africa for convoy escort duties in 1940 before returning to the Mediterranean. The ship participated in the Battles of Calabria without significant damage and escorted ships of the Mediterranean Fleet for most of the rest of the year. Decoy assisted in the evacuations from Greece and Crete in April–May 1941. She began escorting supply convoys in June to Tobruk, Libya, until the ship was badly damaged in a collision in November. Repairs were not completed until February 1942 and Decoy was transferred to the Eastern Fleet in the Indian Ocean the following month. She remained there until September when she was ordered to return to Britain. The ship was refitted as an escort destroyer from November to April 1943 and transferred to the Royal Canadian Navy that same month as HMCS Kootenay. The ship was assigned to convoy escort duties in the mid-Atlantic for the rest of 1943 and early 1944. Kootenay was transferred back to British coastal waters in May to protect the build up for Operation Overlord. Together with other ships, she sank three German submarines between July and September. The ship was given a lengthy refit in Canada from October to February 1945 and returned to the English Channel in April to protect against any last-gasp efforts by the Kriegsmarine to interfere with Allied supply lines to the Continent. After the end of the war in May, Kootenay served as a troop transport in Canadian waters. She was placed in reserve in October and broken up in 1946. Description Decoy displaced at standard load and at deep load. The ship had an overall length of , a beam of and a draught of . She was powered by Parsons geared steam turbines, driving two shafts, which developed a total of and gave a maximum speed of . Steam for