Roosevelt had saved his countrymen from their own ardor. His decision provoked dismay, even disgust, and would remain controversial for decades. “We failed to see,” Marshall later said of his fellow generals, “that the leader in a democracy has to keep the people entertained.” Eisenhower believed the cancellation of SLEDGEHAMMER might be remembered as the “blackest day in history”—a silly hyperbole, given the blackness of other days.

