the turbines was provided by three Admiralty 3-drum water-tube boilers. Decoy carried a maximum of of fuel oil that gave her a range of at . The ship's complement was 145 officers and men. The ship mounted four 45-calibre QF 4.7-inch Mk IX guns in single mounts, designated 'A', 'B', 'X', and 'Y' from front to rear. For anti-aircraft (AA) defence, Decoy had a single QF 3-inch 20 cwt AA gun between her funnels, and two quadruple Mark I mounts for the 0.5-inch Vickers Mark III machine gun. She was fitted with two above-water quadruple torpedo tube mounts for torpedoes. One depth charge rail and two throwers were fitted; 20 depth charges were originally carried, but this increased to 35 shortly after the war began. Career Decoy was ordered on 2 February 1931 under the 1930 Naval Estimates, and was laid down at John I. Thornycroft & Company's yard at Woolston, Southampton, on 25 June 1931. She was launched on 7 June 1932 and completed on 17 January 1933, at a total cost of £225,236, excluding equipment supplied by the Admiralty, such as weapons, ammunition and wireless equipment. The ship was initially assigned to the 1st Destroyer Flotilla in the Mediterranean and made a brief deployment to the Persian Gulf and Red Sea in September–October 1933. New torpedo tubes were fitted at Malta after her return. The ship was refitted at Devonport Dockyard between 3 September and 20 October 1934 for service on the China Station with the 8th (later the 21st) Destroyer Flotilla and arrived there in January 1935. She was attached to the Mediterranean Fleet in the Red Sea from September 1935 to May 1936 during the Abyssinian Crisis and made port visits in Mombasa and other East African ports before returning to Hong Kong. The ship was refitted there in October and toured Southeast Asia in the first quarter of 1937. Decoy required further repairs and fumigation in April–May after her return. In August 1938 she sailed for Tsingtao, carrying representatives to apologise for incidents where drunken sailors had insulted the Japanese flag. She remained in the Far East until the rise in tensions before World War II began prompted her recall in August 1939. World War II With the outbreak of war, Decoy was assigned to the Mediterranean Fleet and assigned to contraband control duties. In December the ship began an extensive refit to repair corrosion