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Soldiers in a landing craft
Soldiers of the 16th infantry regiment land at Omaha Beach, one of the five sectors for Operation Overlord

D-Day is a term used in military planning to mean the actual day a major operation or event is to begin. The days leading up to a D-Day are called D-1, D-2, D-3, and so on. This allows scheduling a sequence of events before the start date is chosen. The days after a D-Day are D+1, D+2, D+3, and so on. Several different events in military history were called D-Day such as the Invasion of Normandy (Operation Overlord).

The most famous D-Day was June 6, 1944 when the biggest naval attack in military history took place, in France during World War II when allied forces crossed over the English Channel from England to the Normandy Coastline. This attack was code named Operation Overlord, led by American General Dwight Eisenhower in reply to the failed Dieppe Raid in 1942. The Allies (Britain, Canada, and America in this case) won the battle, a turning point in World War II, though over 3,500 men were lost. Almost a year later, Nazi Germany surrendered to the Allies. The invasion was planned for months and scheduled for June 5 but was delayed by one day due to bad weather.

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