The Operation Overlord is known as the Battle of Normandy. This battle represents and successful allied invasion of Western Europe that was occupied by Germany in the World War II. The Operation Overlord began on 6 June 1944 with a D-Day (Operation Neptune). This attack included 5.000 vessels and 1.200 airplane assaults. On that day, 160.000 troops crossed the English Channel. By the end of August, more than 3 million allied troops were in France.
In Washington, in May 1943, world leaders decided to start with the invasion in 1944 that should end the World War II. General Bernard Montgomery was the commander of the 21st Army Group and General Dwight D. Eisenhower was the commander of the SHAEF (Supreme Headquarters Allied Expeditionary Force). For the invasion, the Normandy was chosen. The British forces landed on Gold and Sword beaches, the Canadians at Juno Beach and the Americans landed on Omaha and Utah beaches. Mulberry harbours, artificial ports were developed especially for this operation. Erwin Rommel, German Field Marshal, was responsible for the Atlantic Wall and its fortification.
The Allies had on their disposal 1.452.000 troops on 25 July. By the end of August, they have 2.052.299 soldiers on their disposal. They lost: 225.606-226.386 soldiers, 4.000 tanks and 4.101 planes. On the other side, Germany had 380.000 troops (by 23 July), but later that number was increased on 1.000.000. Germany also had 2.200-2.300 tanks and assault guns. They lost: 400.000-450.000 soldiers, 2.127 planes and 2.200 tanks. This operation is also known for massive civilian casualties. In pre-invasion between 11.000 and 19.000 civilian were killed. During the invasion, 13.632-19.900 were killed. This means that more than 38.000 civilians died during this battle.