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But for all that American industrial brawn and organizational ability could do, for all that the British and Canadians and other allies could contribute, for all the plans and preparations, for all the brilliance of the deception scheme, for all the inspired leadership, in the end success or failure in Operation Overlord came down to a relatively small number of junior officers, noncoms, and privates or seamen in the American, British, and Canadian armies, navies, air forces, and coast guards. If the paratroopers and gliderborne troops cowered behind hedgerows or hid out in barns rather than actively seek out the enemy; if the coxswains did not drive their landing craft ashore but instead, out of fear of enemy fire, dropped the ramps in too-deep water; if the men at the beaches dug in behind the seawall; if the noncoms and junior officers failed to lead their men up and over the seawall to move inland in the face of enemy fire—why, then, the most thoroughly planned offensive in military history, an offensive supported by incredible amounts of naval firepower, bombs, and rockets, would fail.
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Stephen E. Ambrose (D-Day Illustrated Edition: June 6, 1944: The Climactic Battle of World War II)