The Allies agreed to begin discussions for the planning of the invasion of France, codenamed Operation Overlord, in a secret report by the Combined Chiefs of Staff. It was agreed that Overlord would commence on May 1, 1944, but this was subsequently disregarded and a later date was finalised. However, Overlord was not the only option; for example, Operation Jupiter remained a strong possibility had the Germans proved too powerful on the French coast. In the Mediterranean (a theatre on which Churchill was very keen) they resolved to concentrate more force to remove Italy from the alliance of Axis powers and to occupy it along with Corsica. Churchill and Roosevelt made it clear that they would only accept unconditional surrender from Italy, with there to be a complete and immediate cessation of fighting. News came through of the fall of Sicily to Allied forces, an invasion that had taken just 38 days. It was then decided that an invasion of Italy would begin on September 3, 1943. However, an armistice was signed that same day, which officially put Italy out of the war.