vitriolic with Tizard being called a defeatist. It was while this debate about bombing was raging inside the British military establishment that the area bombing directive of 14 February 1942 was issued; eight days later Arthur "Bomber" Harris took up the post of Air Officer Commanding-in-Chief (AOC-in-C) of Bomber Command. Aftermath As the war progressed, RAF Bomber Command improved its methods. Electronic navigational instruments like GEE, Oboe, G-H and the ground-mapping radar codenamed H2S all helped to improve bombing accuracy. Improvement in tactics such as the development of the Pathfinder Force, created against Harris's wishes, also improved bombing accuracy. By 1945, No. 5 Group RAF could sector-bomb in a fan-shaped pattern that maximised the coverage and effect of incendiary bombs. To create this effect, the run of a bomber was timed and calculated to fan out from a bomb aiming point, as was done in the bombing of Dresden in February 1945, when the aiming point was the Ostragehege soccer stadium, easily identifiable with H2S. Notes References Further reading CABINET PAPERS: Complete classes from the CAB & PREM series in the Public Record Office Series One: PREM 3 - Papers concerning Defence & Operational Subjects, 1940-1945 Winston Churchill, Minister of Defence, Secretariat Papers Butt Report Summary Transcript Reference to the Butt Report at The National Archives 1941 documents History of the Royal Air Force during World War II