‘Even with members of his own team in disagreement over the June 6 forecast, Stagg made the call that changed history. From his study of the weather charts, he forecast a break in the clouds, giving Eisenhower about a 36-hour window of better weather beginning June 6. Based on that information, Eisenhower affirmed the operation at 4:15 a.m. on June 5 by saying: ‘Okay, let’s go.’ D-Day was to begin at 6:30 a.m. on June 6.

// Encyclopaedia Britannica Blog.

. ‘All that Eisenhower did was say ‘yea’ or ‘nay.’