COSSAC was charged with planning three operations: Operation Cockade, a deception operation to keep German forces pinned to the coast; Operation Rankin, a plan for measures to be taken in the case of a sudden German collapse; and Operation Overlord, a plan for a full-scale assault on north western Europe.
The Combined Chiefs of Staff authorised Morgan to issue orders in the name of the Supreme Allied Commander to the Commanders in Chief of the Air, Naval and Land Forces, even though they outranked him [REF].