The answer is D Day. It is the Invasion of Normandy. On June 6, 1944, Led by Eisenhower, over a million troops (which is the largest invasion force in history) stormed the beaches at Normandy and started the process of re-taking France. The joined forces of America, Britain, Canada, and France attacked the German forces on the coastline of Normandy, France. With a huge force of over 150,000 soldiers, the Allies attacked and achieved triumph that became the turning point for World War II in Europe.