Planning for "Bodyguard" began even before Operation Cockade was fully under way, following the decision that Normandy would be the site of the coming invasion. The departments responsible for deception, 'A' Force, COSSAC's Ops (B) and the London Controlling Section, began to address the problem of achieving tactical surprise for "Overlord". They produced a paper, entitled "First Thoughts", on 14 July 1943 that outlined many of the concepts that would later form the "Bodyguard" plan. However, since "Cockade" concluded with limited success, most of the Allied high command were sceptical that any new deception would work.