On this day. Operation Neptune was the codename given to the initial assault phase of largest seaborne invasion in history: Operation Overlord; its mission, to gain a foothold on the continent, started on June 6, 1944 (most commonly known by the name D-Day) and ended on June 30, 1944.
"In the East, the vastness of space will... permit a loss of territory... without suffering a mortal blow to Germany’s chance for survival. Not so in the West! If the enemy here succeeds… consequences of staggering proportions will follow within a short time." Adolf Hitler.
'The Normandy landings were the first successful opposed landings across the English Channel for nine centuries. They were costly in terms of men, but the defeat inflicted on the Germans was one of the largest of the war. Strategically, the campaign led to the loss of the German position in most of France and the secure establishment of a major new front.' Lest we forget.