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In page Baggush Box:

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The box was built by men of the Western Desert Force (Lieutenant-General Richard O'Connor) as a tented camp, with offices, said to be bomb-proof dug under sand dunes, as a temporary billet for troops taking part in operations against the Italian invasion of Egypt in 1940 by the Italian 10th Army. O'Connor opened his headquarters on 8 June. An airfield was a short distance inland and served as the headquarters of the Desert Air Force (Air Commodore Raymond Collishaw).[1]