DEVISING D-DAY

D-DAY: THE BUILD UP

The invasion that started the liberation of France required more than two years of careful planning – detailed consideration that began almost as soon as the United States entered the war

Part of an original map wall inside Southwick House, Portsmouth, where the Supreme Headquarters Allied Expeditionary Force met to confirm the D-Day plans
LEON NEAL/GETTY

1942

January 14: ARCADIA

Following the attack on Pearl Harbor on December 7, 1941 (and near-simultaneous attacks on British territories in the Far East), the United States and the existing Allies declared war on Japan, while Germany and Italy declared war on the United States, drawing the emergent superpower into a two-theatre conflict.

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