Operation Sledgehammer

• 1. Introduction

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  Operation Sledgehammer was a plan that could have changed the entire shape of the Second World War. In the spring of 1942, with German forces driving deep into Soviet territory, American generals arrived in London carrying two proposals for a cross-Channel invasion of France. One of those plans, Sledgehammer, called for Allied forces to seize the French Atlantic ports of Brest or Cherbourg before the year was out. The questions that followed that visit would define Allied strategy for years: Who would bear the cost of an early invasion? Could it actually work? And what happens when the United States and Britain cannot agree?

• 2. Roosevelt's Pressure

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  In March 1942, U.S. President Franklin Roosevelt wrote directly to British Prime Minister Winston Churchill to make his case. He argued that a new European front that summer made strategic sense, partly because the Atlantic crossing was far shorter than other supply routes. He put it plainly: even if losses were great, those losses would be offset by equal German losses, and by forcing Germany to pull troops away from the Eastern Front. That logic reflected the core anxiety driving American planning. The Soviet Union was absorbing enormous punishment, and American officials feared it might collapse before U.S. forces were fully prepared to fight. On the 8th of April, General George C. Marshall and Harry Hopkins traveled to Britain to press the case in person, carrying the two American proposals: Operation Roundup and Operation Sledgehammer.

• 3. The Plan Itself

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  Roundup was the original Allied blueprint for invading continental Europe, designed to be launched before April 1943 with 48 divisions, 18 of them British. Sledgehammer was the earlier, more urgent alternative. It called for capturing either Brest or Cherbourg and areas of the Cotentin Peninsula in the autumn of 1942, then building up forces for a breakout in the spring of 1943. Soviet Foreign Minister Vyacheslav Molotov supported the idea and tried to persuade both British and American officials to commit to it. There was a structural problem, however, that undermined the plan from the start: American troops were not yet available in sufficient numbers, which meant British forces would bear the primary burden of the assault.

• 4. British Resistance

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  British officials concluded that a landing in France in 1942 was premature and simply impractical. Some historians, including Robin Neillands, went further and described the plan as "little short of blackmail" and "lunacy," given the likely scale of German resistance. The British counter-proposal pointed toward North Africa instead, where less experienced American troops could gain battlefield practice in a lower-risk theater while the Allies gradually built overwhelming force before confronting Germany head-on. At the Second Washington Conference in June 1942, Roosevelt and Churchill agreed to postpone the cross-Channel invasion until 1943, making a second front in North Africa the immediate priority.

• 5. The Final Decisions

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  At the Second Claridge Conference in London, held from the 20th to the 26th of July, Churchill, Roosevelt, and Harry Hopkins agreed to substitute Operation Torch, the invasion of French North Africa, in place of U.S. reinforcement of the Western Desert campaign. Senior American commanders pushed back hard. After the Combined Chiefs of Staff met in London on the 30th of July, Marshall and Admiral Ernest King declined to approve the North Africa plan. Marshall went so far as to suggest to Roosevelt that the United States abandon the Germany-first strategy entirely and pivot to the Pacific. Roosevelt rejected that, saying it would do nothing to help Russia. Facing a deadlock, Roosevelt issued a direct order: Torch was to take precedence over all other operations and was to happen at the earliest possible date. It was one of only two direct orders Roosevelt gave to military commanders during the entire war.

• 6. What Came Next

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  Operation Torch launched in November 1942, delivering what both Britain and the United States needed, even if neither side had initially wanted the same thing. Britain secured its objective of winning in North Africa; the United States engaged Nazi Germany in combat on a limited, manageable scale. In the interim, a large-scale Canadian-led raid on the French coast was planned to relieve some of the pressure on the Soviet Union. By November 1942, Eisenhower, by then a lieutenant general, told Churchill directly that no major operation on the European continent could take place before 1944. That assessment confirmed what the British had argued all along, and it pushed the actual cross-Channel invasion two full years past the window Sledgehammer had targeted.