On June 6, 1944, Allied forces launched the largest seaborne invasion in history, targeting the beaches of Normandy, France. Codenamed Operation Neptune, the landings were the first step in Operation Overlord, the campaign to liberate Western Europe from Nazi occupation. More than 150,000 troops from the US, UK, Canada, and other nations landed on five beaches: Utah, Omaha, Gold, Juno, and Sword. Despite heavy casualties—particularly at Omaha Beach—the Allies successfully established a beachhead. The success of D-Day forced Germany to fight a two-front war, drastically accelerating the fall of the Third Reich. It required unprecedented logistical coordination and remains a landmark event in military strategy.