Operation Overlord was the code name for the Allied invasion of Nazi-occupied Europe during World War II. It began on June 6, 1944, known as D-Day, when Allied forces landed on the beaches of Normandy, France. This massive military operation involved troops from the United States, United Kingdom, Canada, and other nations, aiming to establish a foothold in Europe and push back German forces. The operation was meticulously planned and included extensive air and naval support. It marked a significant turning point in the war, leading to the liberation of Western Europe from Nazi control. By the end of August 1944, Allied forces had successfully captured Paris, further weakening the German military.