From history.com
On June 6, 1944, Supreme Allied Commander General Dwight D. Eisenhower gives the go-ahead for the largest amphibious military operation in history: Operation Overlord, the Allied invasion of northern France, commonly known as D-Day.
By daybreak, 18,000 British and American parachutists were already on the ground. An additional 13,000 aircraft were mobilized to provide air cover and support for the invasion. At 6:30 a.m., American troops came ashore at Utah and Omaha beaches.
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