Some figures:
On 6th June, 1944, 2,727 ships sailed to the Normandy coast and on the first day landed 156,000 men on a front of thirty miles. It was the largest and most powerful armada that has ever sailed.
The Allied invasion was faced by 50 divisions of the German Army under General Erwin Rommel. At Omaha, steep cliffs favoured the defenders and the US Army suffered 2,500 casualties.
The Allies also sent in three airborne divisions, two American and one British, to prepare for the main assault by taking certain strategic points and by disrupting German communications. Of the 23,000 airborne troops, 15,500 were Americans and of these, 6,000 were killed or seriously wounded.
Over the next couple of days 156,215 troops were landed from sea and air in Normandy, at a cost of some 10,300 casualties.
http://www.spartacus.schoolnet.co.uk/2WWdday.htm