D Day was undated because Eisenhower did not want to give the enemy any information on when the attack would occur. Also the attack would not occur until weather and tide conditions were right. Eisenhower and Montgomery were ready to attack at any time.
D. Eisenhower
It was Operation Overlord. D-Day was the first day.
D-Day
Dwight Eisenhower
Dwight Eisenhower
D-day is any day on which a military attack starts. D-day is usually referenced to the day that the allies invaded Normandy during World War II.
on d-day, the allies began a massive surprise attack on Germany forces in France
"D" in d-day stands for . . . 'day', and it refers to the day on which a major war attack will start. If it is capitalized, like "D-Day", then it refers to the Allies 1944 invasion of Europe in World War II.
Allied aircraft attacked German targets before D-Day to keep German aircraft on the ground. The Luftwaffe was notable by its absence on the day.
those were the landings on Normandy beach.
D-day
June the 6th, 1944.