View images taken from D-day of World War II. On June 6, 1944, a million and a half Allied troops stormed the French coastline in the greatest invasion in history. More than 2,500 Americans would lose their lives as the Allied Army ripped through Hitler’s Atlantic Wall, a German fortification along the Atlantic coastline, and began its campaign to liberate the country. The Allies would succeed in liberating Paris two months later, on August 25. The day of the invasion is forever known as “D-Day,” and would it mark a turn in World War II toward an eventual Allied victory.