HMS Defender was a D-class destroyer built for the Royal Navy in the early 1930s. The ship 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 assigned station where she remained until mid-1939. Defender was transferred back to the Mediterranean Fleet just before World War II began in September 1939. She briefly was assigned to West Africa for convoy escort duties in 1940 before returning to the Mediterranean. The ship took part in the Battles of Calabria, Cape Spartivento, and Cape Matapan over the next year without damage. Defender assisted in the evacuations from Greece and Crete in April–May 1941, before she began running supply missions to Tobruk, Libya in June. The ship was badly damaged by a German bomber on one of those missions and had to be scuttled by her consort on 11 July 1941.

The C and D class was a group of 14 destroyers built for the Royal Navy in the early 1930s. As in previous years, it was originally intended to order a complete flotilla comprising eight destroyers—plus a flotilla leader as the ninth unit—in each year. However, only four ships—plus a leader—were ordered under the 1929–1930 Programme as the C class. The other four ships planned for the C class were never ordered as an economy measure and disarmament gesture by the Labour government of Ramsay MacDonald. A complete flotilla—the 'D' class—was ordered under the 1930–1931 Programme.