The Allied invasion of Northern France which took place on D-Day, 6th June 1944, demanded land, naval and air forces cooperate effectively to overcome the strong German coastal defences. Knowledge of the enemy’s forces and dispositions would be invaluable, and therefore the invasion was supported at all stages by the Codebreakers of Bletchley Park. By this stage in the war, each stage of decrypting and analysing enemy messages had been split up and assigned to specialists. Far from merely decrypting messages, Bletchley Park had mastered the entire intelligence process from interception to dissemination: it had become a true intelligence factory.
1 / 10 — The Western Front Committee was established at Bletchley Park in November 1942. It existed to coordinate all intelligence from across the Park which might be relevant to a forthcoming invasion of Northwest Europe and included senior representatives from the various departments. From February 1943 the committee began to produce reports according to a set format. Held in the archives of the Bletchley Park Trust and amounting to over 450 pages, these provide a unique insight into the sheer depth of the Codebreakers’ knowledge of the enemy in the run up to D-Day.