On June 6th 1944 the largest military campaign in history began in northern France with more than 150,000 Allied troops advancing on German-occupied Western Europe.D-Day: The Story of the Greatest Military Operation in History explains why Normandy was chosen for the amphibious attack and how the Allied leaders deceived Hitler's army as well as detailing the planes, boats and tanks deployed in the operation. Incredible in-the-field photos bring this heroic and historic day to life.