How long did it take to plan this landing at Normandy France by the allies?

Answer 1

Over a year went in to planning the specific landings at Normandy. The work began in April 1943, when US General Frederick Morgan was ordered to start on the project. Morgan called himself COSSAC - "Chief of Staff to the Supreme Allied Commander". The "Supreme Allied Commander" had not been named yet, and would not be for several more months, before Churchill and Roosevelt agreed on General Eisenhower. British General Montgomery was to be commander of the ground forces in the initial operations, until the beachhead was large enough for Eisenhower to move his headquarters from England to the continent. Montgomery made numerous changes to the plans Morgan and his assistants had developed.

Even before Morgan was directed to start work on the plan which became Operation Overlord, there existed a British plan called Operation Roundup. This was developed beginning in late 1941, and was for a hurry-up, emergency landing in France, to gain a toe-hold and, it was hoped, hold out until it could be reinforced enough to be expanded. This was to take place if it appeared that the Germans were about to finish off the Russians The eastern front was occupying most of German military effort, and if the Germans won their war there, they would be able to move huge numbers of troops to France. This would make it very difficult, if not almost impossible to make a successful cross-channel attack, so Roundup was to be a desperate effort to gain a lodgement in France before the Germans could become too strong there.

Answer 2

Over a year went in to planning the specific landings at Normandy. The work began in April 1943, when US General Frederick Morgan was ordered to start on the project. Morgan called himself COSSAC - "Chief of Staff to the Supreme Allied Commander". The "Supreme Allied Commander" had not been named yet, and would not be for several more months, before Churchill and Roosevelt agreed on General Eisenhower. British General Montgomery was to be commander of the ground forces in the initial operations, until the beachhead was large enough for Eisenhower to move his headquarters from England to the continent. Montgomery made numerous changes to the plans Morgan and his assistants had developed.

Even before Morgan was directed to start work on the plan which became Operation Overlord, there existed a British plan called Operation Roundup. This was developed beginning in late 1941, and was for a hurry-up, emergency landing in France, to gain a toe-hold and, it was hoped, hold out until it could be reinforced enough to be expanded. This was to take place if it appeared that the Germans were about to finish off the Russians The eastern front was occupying most of German military effort, and if the Germans won their war there, they would be able to move huge numbers of troops to France. This would make it very difficult, if not almost impossible to make a successful cross-channel attack, so Roundup was to be a desperate effort to gain a lodgement in France before the Germans could become too strong there.