D-Day is a military term designating the start of a military operation.
The D-day in modern history refers to what happened on 6th June 1944 - the day on which the Battle of Normandy began.
It was a huge effort involving months of secret preparations. Thousands of Allied troops landed on the beaches of Normandy, in northern France, at the start of the battle to liberate mainland Europe from Nazi occupation.
D-day marked the turning point in World War II when the Allied forces began to win their fight against the Axis powers.
The invasion was code-named Overlord. I DONT KNOW I USED GOOGLE
