
It is also known as operation Neptune and Operation Overlord during World War II. D-Day is the planning of the actual landing day which came dependent to the final approval.
Millions cried out for freedom. Europe was deprived, and the world prayed for its rescue. Here, in Normandy, the rescue began. Here, the Allies stood and fought against dictatorship, in a giant undertaking unparalleled in human history. The men of Normandy had faith that what they were doing was right, faith that they fought for all humanity, faith that God would grant them mercy on this beachhead.
There are many websites with good information to tell the tale of that morning of June 6, 1944.