The historical event remembered annually on June 6 is D-Day, the Allied invasion of Normandy during World War II in 1944. This operation marked a significant turning point in the war against Nazi Germany. Allied forces, comprised mainly of American, British, and Canadian troops, launched a massive amphibious assault on the beaches of Normandy, France, in a bid to liberate Western Europe from German occupation. D-Day involved extensive planning and coordination and was one of the largest military invasions in history. The successful landings allowed the Allies to establish a foothold in Europe, paving the way for subsequent liberation efforts and the eventual defeat of Germany.