heavy bomber squadrons, winning the Lawrence Minot Memorial Bombing Trophy six times between 1927 and 1933 and shared in 1934 with 54 Squadron, achieving an average bombing error of 40 yards (37 m). By this time, the elderly Virginia was obsolete and in April 1935 they were replaced by the more modern Handley Page Heyford, with which the squadron won the Lawrence Minot trophy yet again in 1935. Part of the squadron was split off in October 1935 to form No. 102 Squadron, while the remainder moved to RAF Finningley in September 1936. In April 1937 the squadron received four Vickers Wellesleys to equip a flight which was again split off to form 76 Squadron. In March 1938 it replaced its Heyford biplanes with monoplanes from Armstrong Whitworth Whitley . It re-equipped again in April 1939, with Handley Page Hampden bombers replacing the Whitleys. In June 1939 it became a training unit, preparing crews for the Hampden equipped 5 Group. Second World War On the outbreak of the Second World War, it continued to be used for training bomber crews, disbanding on 4 April 1940 when it merged with 76 Squadron to form No. 16 OTU. On 1 August 1940 it reformed, becoming the first squadron to equip with the new Short Stirling heavy bomber, the first RAF squadron to operate four engined bombers during the Second World War, flying the first bombing raids with the Stirling against oil storage tanks near Rotterdam on the night of 10/11 February 1941. It flew on the 1000 bomber raids to Cologne, Essen and Bremen in May and June 1942. It was transferred to the Pathfinder Force in August 1942, with the job of finding and marking targets for the Main Force of Bomber Command bombers. The squadron re-equipped with the Avro Lancaster from 11 May 1943, flying its first mission with the Lancaster on 12 July 1943. It continued in the Pathfinder role until the end of the war in Europe. It flew its last bomber mission on 25 April 1945 against Wangerooge, and dropped food to starving civilians in the Netherlands in May. While it was planned to fly 7 Squadron out to the Far East to join Tiger Force for air attacks against Japan, the war ended before the squadron was due to move. The squadron carried out 5,060 operational sorties with the loss of 165 aircraft. Post-war After World