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Nobody ever launched an attack without having misgivings beforehand, You ought to have misgivings before; but when the moment of action is come, the hour of misgivings is passed. It is often not possible to go backward from a course which has been adopted in war. A man must answer "Aye" or "No" to the great questions which are put, and by that decision he must be bound.

Winston Churchill, Robert Rhodes James (1980). “Churchill speaks: Winston S. Churchill in peace and war : collected speeches, 1897-1963”, Atheneum
Nobody ever launched an attack without having misgivings beforehand, You ought to have misgivings before; but when the moment of action is come, the hour of misgivings is passed. It is often not possible to go backward