The D-Day invasion, also known as Operation Overlord, took place on June 6, 1944, during World War II. It marked a significant turning point in the war as Allied forces launched a massive amphibious assault on the beaches of Normandy, France. This operation involved thousands of troops from the United States, United Kingdom, Canada, and other nations, aiming to liberate Western Europe from Nazi occupation. The success of D-Day was crucial for the Allies, as it established a foothold in Europe and paved the way for further advances into German-occupied territory. The bravery and sacrifice of the soldiers involved are commemorated annually, highlighting the importance of this pivotal moment in history.