On June 6, 1944, a date known ever since as D-Day, a mighty armada crossed a narrow strip of sea from England to Normandy, France, and cracked the Nazi grip on western Europe.
May 1944 had been chosen at the conference in Washington in May 1943 as the time for the invasion. Difficulties in assembling landing craft forced a postponement until June, but June 5 was fixed as the unalterable date by Eisenhower on May 17. As the day approached and troops began to embark for the crossing, bad weather set in, threatening dangerous landing conditions. After tense debate, Eisenhower and his subordinates decided on a 24-hour delay, requiring the recall of some ships already at sea. Eventually, on the morning of June 5, Eisenhower, assured by chief meteorologist James Martin Stagg of a break in the weather, announced, “O.K. We'll go.” Within hours an armada of 3,000 landing craft, 2,500 other ships, and 500 naval vessels—escorts and bombardment ships—began to leave English ports. That night 822 aircraft, carrying parachutists or towing gliders, roared overhead to the Normandy landing zones. They were a fraction of the air armada of 13,000 aircraft that would support D-Day.
http://www.britannica.com/dday/browse?browseId=237147
