Soulier, Dominique 1943-1944. Plan Sussex, Plan Proust. B.C.R.A., OSS & SIS. Missions secrètes interalliées

The "Sussex" plan is a top-secret Franco-American-British tripartite mission decided by General Eisenhower's general staff in the run-up to the Normandy landings and subsequently for the liberation battles in France. Under the direction of the British intelligence service SIS, the American intelligence service OSS and the French intelligence service BCRA, 120 French officers were recruited to carry out a bold plan: From the beginning of February 1944 and until the complete liberation of France, teams of two plainclothes agents (an observer and a radio operator) were to parachute behind enemy lines. Their task was to inform the Allied General Staff about the German order of battle around the clock. The "Proust" plan, which complemented the "Sussex" plan, was a bipartite French-American intelligence operation that was carried out from D-Day (6 June 1944) in the operational area of the American forces. A total of 65 "Proust" agents carried out intelligence and operational tasks.