Merriam Press World War II History No. 16. First eBook Edition, 2015. Official history of the initial planning for the Normandy invasion, prepared by the Historical Sub-Section, Office of Secretary, General Staff, Supreme Headquarters, Allied Expeditionary Force. Contents: Introduction. (1) The Origins of COSSAC. (2) The Aims of COSSAC. (30 The Development of COSSAC. (4) Operation Cockade. (5) Operation Rankin.(6) Operation Overlord. Bibliography. Appendix: Lt.-Gen Sir Frederick E. Morgan, Chief of Staff to the Supreme Allied Commander (COSSAC), the original planner of Operation Overlord. 4 photos, 1 illustration, 2 charts.