What was “D Day?” Allied troops invaded Normandy, France, on June 6, 1944, to fight Nazi Germany in World War II. The largest amphibious (land and water) invasion in history. The code name for the invasion was Operation Overlord. General Dwight D. Eisenhower commanded the operation, and plans were made to land in Normandy, west of where the German troops and artillery were built up.

The "D" stands for Day. D-Day is code for the day an important military attack is scheduled to begin.

Code names for the five beaches where the Allies landed: Utah, Omaha, Gold, Juno and Sword.

More than 13,000 aircraft and 5,000 ships supported the operation.
The exact number of casualties is not known. It is estimated that approximately 10,000 Allied soldiers were killed, wounded and or went missing in action: 6,603 Americans, 2,700 British and 946 Canadians.

Timeline
August 19, 1942 - A raid on the French p
ort of Dieppe resulting in heavy losses convinces D-Day planners to land on the beaches. Preparations begin for an Allied invasion across the English Channel.

May 1943 - The Trident Conference, a British and US strategy meeting on the war takes place in Washington, DC. Winston Churchill, President Theodore Roosevelt and their military advisers discuss crossing the English Channel.

August 1943 - British and US military chiefs of staff outline Operation Overlord during the Quadrant Conference.
November and December 1943 - British and US military chiefs discuss the specifics of the assault on France during the Sextant and Eureka Conferences.

1944 - The Germans expect an invasion along the north coast of France, but they do not know where it will occur. They build up their troops and artillery near Calais, where the English Channel is the narrowest.

June 5, 1944 - Allied paratroopers and gliders carrying heavy equipment leave England to begin the invasion of France by air.
In a broadcast message to troops before they leave, Eisenhower tells them, "The tide has turned! The free men of the world are marching together to victory.... We will accept nothing less than full victory!"
June 6, 1944 - Overnight, a military armada and more than 160,000 troops cross the English Channel. Minesweepers go ahead to clear the waters in preparation for the thousands of landing crafts that will be carrying men, vehicles and supplies.

Between midnight and 8 a.m., Allied forces fly 14,674 sorties.
At 6:30 a.m. troops begin coming ashore on a 50-mile front.
In a broadcast to the people of occupied Europe, Eisenhower says, "Although the initial assault may not have been made in your own country, the hour of your libWar memorials and tourism in Normandy
At Omaha Beach, parts of the Mulberry harbour are still visible, and a few of the beach obstacles remain. A memorial to the US National Guard sits at the location of a former German strongpoint. Pointe du Hoc is little changed from 1944, with the terrain covered with bomb craters and most of the concrete bunkers still in place. 
The Normandy American Cemetery and Memorial is nearby, in Colleville-sur-Mer. A museum about the Utah landings is located at Sainte-Marie-du-Mont, and there is one dedicated to the activities of the US airmen at Sainte-Mère-Église. Two German military cemeteries are located nearby.
Pegasus Bridge, a target of the British 6th Airborne, was the site of some of the earliest action of the Normandy landings. The bridge was replaced in 1994 by one similar in appearance, and the original is now housed on the grounds of a nearby museum complex. Sections of Mulberry Harbour B still sit in the sea at Arromanches, and the well-preserved Longues-sur-Mer battery is nearby. The Juno Beach Centre, opened in 2003, was funded by the Canadian federal and provincial governments, France, and Canadian veterans.
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