" Since January, when he had arrived in England to command Overlord, Eisenhower had been under crushing, ever greater strain. Now it had all boiled down to this decision. Eisenhower alone—not Roosevelt, not Churchill—had the authority to give the final command to go, to “enter the continent of Europe,” as his orders from on high had stated, and “undertake operations aimed at the heart of Germany and the destruction of her armed forces.”3 He alone could pull the trigger. Marshaling the greatest invasion in the history of war had been, at times, as terrifying as the very real prospect of failure. The last time there had been "

― Alex Kershaw , The First Wave: The D-Day Warriors Who Led the Way to Victory in World War II