Operation Sledgehammer
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During World War II, Operation Sledgehammer was an Allied contingency plan for a limited-objective cross-channel invasion of Europe in response to a German or Soviet collapse in 1942. It was to be used to reduce pressure on the Russians.
The main objective of the operation was to capture Cherbourg or Brest in northern France in order to establish a defensible foothold in mainland Europe, which would provide a staging area for a larger invasion force.
The United States argued for the operation, but the United Kingdom was against it. The Allies eventually agreed that they did not have enough landing craft at the time and abandoned the plan in favour of Operation Gymnast (later renamed Operation Torch), the invasion of Northern Africa. The costly raid on Dieppe later demonstrated the difficulty of capturing a major port in the face of determined enemy opposition, and the D-Day invasion of Normandy avoided ports altogether.