Operation Sledgehammer
In December 1941, the United States entered World War II and immediately began pushing for an invasion of mainland Europe. The U.S. Joint Chiefs of Staff demanded action via the English Channel as soon as possible. By March 1942, President Franklin Roosevelt wrote a letter to British Prime Minister Winston Churchill urging immediate movement. On April 8, General George C. Marshall and Harry Hopkins arrived in Britain to press their case. They presented two plans: Operation Roundup and Operation Sledgehammer. Soviet Foreign Minister Vyacheslav Molotov also tried to convince both British and American officials to act. The pressure from Moscow was intense, seeking to reduce the burden on the Red Army.
American officials like Marshall encouraged capturing French cities such as Brest or Cherbourg during the latter half of 1942. These ports would serve as staging grounds for more extensive operations planned for 1943. Allied forces intended to seize areas of the Cotentin Peninsula in early autumn 1942. Troops were supposed to amass there for a breakout attempt in spring 1943. Operation Roundup remained the original plan to be mounted before April 1943 using 48 divisions. Sixteen of those divisions were designated as British units. The scale of this proposed invasion dwarfed any previous amphibious assault in history.
British officials did not believe the proposal was feasible against German defenses. Some historians including Robin Neillands have called the plan little short of lunacy. The primary responsibility fell on British troops since American soldiers were not readily available. Churchill and his advisors concluded that landing in France at that time was premature. They viewed the potential resistance from Germany as overwhelming and dangerous. The risk of failure seemed too high given the lack of sufficient resources. This assessment led directly to their refusal to support the American timeline.
At the Second Washington Conference held in June 1942, Roosevelt and Churchill made a critical choice. They decided to postpone the cross-English Channel invasion until 1943 instead of 1942. Their new priority became opening a second front in North Africa rather than Europe. Harry Hopkins joined them for further discussions during the Second Claridge Conference in London from July 20 to 26. Senior U.S. commanders expressed strong opposition to these landings after the Combined Chiefs of Staff met in London on July 30. Marshall and Admiral Ernest King declined to approve the original Sledgehammer plan despite their earlier advocacy.
Roosevelt gave a direct order that Operation Torch was to take precedence over all other operations. He stated it must happen at the earliest possible date, one of only two such orders he issued during the war. The British proposal for an invasion of French North Africa replaced the cancelled European landing entirely. This substitution occurred in November 1942 under the code name Operation Torch. Eisenhower told Churchill in November 1942 that no major operation on the Continent could be carried out before 1944. The cancellation of Sledgehammer allowed American forces to gain experience in a less risky theatre while building overwhelming force for future campaigns.
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Common questions
What was Operation Sledgehammer?
Operation Sledgehammer was a planned World War II military operation intended to invade mainland Europe through the English Channel in 1942. The plan aimed to capture French cities such as Brest or Cherbourg to serve as staging grounds for more extensive operations.
When did President Franklin Roosevelt write about Operation Sledgehammer?
President Franklin Roosevelt wrote a letter to British Prime Minister Winston Churchill urging immediate movement by March 1942. This correspondence occurred after the United States entered World War II in December 1941 and pushed for an invasion of mainland Europe.
Who proposed Operation Roundup alongside Operation Sledgehammer?
General George C. Marshall and Harry Hopkins presented both plans including Operation Roundup and Operation Sledgehammer on April 8 when they arrived in Britain. Soviet Foreign Minister Vyacheslav Molotov also tried to convince both British and American officials to act during this period.
Why was Operation Sledgehammer cancelled?
British officials concluded that landing in France at that time was premature due to overwhelming German resistance and dangerous risks. They viewed the potential failure as too high given the lack of sufficient resources available in 1942.
What replaced Operation Sledgehammer in November 1942?
The British proposal for an invasion of French North Africa replaced the cancelled European landing entirely under the code name Operation Torch. Eisenhower told Churchill in November 1942 that no major operation on the Continent could be carried out before 1944.