“…His [Rommel] aide well remembered a day when Rommel had summed up his strategy…everything we have must be on the coast. Believe me Lang, the first twenty-four hours of the invasion will be decisive…for the Allies, as well as Germany, it will be the longest day.”
Cornelius Ryan “The Longest Day” (pages 27-28)
https://www.youtube.com/watch?v=ztoAMD0hMZM