"Dagen D," or "D-Day," refers to June 6, 1944, when Allied forces launched a massive invasion of Nazi-occupied France during World War II. This operation, known as Operation Overlord, involved landing troops on five beachheads in Normandy, including Omaha and Utah beaches. It marked a significant turning point in the war, leading to the liberation of Western Europe from Nazi control. The invasion was meticulously planned and involved extensive coordination among the Allies, including the United States, United Kingdom, and Canada. Approximately 156,000 troops landed on D-Day, supported by air and naval forces. The success of D-Day paved the way for the eventual defeat of Nazi Germany in May 1945.