Allied troops -- the largest military fleet in history -- left England to land in Normandy on the northern coast of France, June 6, 1944, in hope of freeing Europe from Nazi Germany. In the spring of 1944, the Allies rolled the dice and chanced the whole fate of the Second World War on a single day. On the 70th anniversary of D-Day, National Geographic Channel revisits the Allied forces’ June 6, 1944 Normandy landings and the ensuing 100 days leading up to the liberation of Paris from the Nazis.