In February 1943 for the first time the Allies, above all the Americans, were building more ship tonnage than the Germans were sinking. By May 1943 U-boat losses were running at one a day and submarine commanders were becoming reluctant to engage the enemy. On 24 May 1943 Admiral Dönitz conceded defeat and ordered the submarine fleet to move out of the North Atlantic. U-boats continued to be constructed in substantial numbers, new, more advanced types were commissioned, and the war at sea continued, but the threat to Allied supplies across the Atlantic and through the Arctic Ocean was never
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