Paul Dickson chronicles the remarkable transformation of the United States Army from a scattered peacetime force of barely 200,000 men into the massive, trained organization that would fight World War II. The story begins in 1940, when the fall of France shocked Americans into recognizing the threat, and follows the unprecedented peacetime draft, the massive training program, and the Louisiana Maneuvers that tested this new army against itself. Dickson draws on memoirs, military records, and contemporary accounts to reconstruct the logistical challenges of arming, housing, and training millions of men in months rather than years. The book introduces key figures whose decisions shaped the future military: George Marshall rebuilding the officer corps, Dwight Eisenhower emerging as an organizational genius, George Patton developing armored tactics. But Dickson also captures the experience of ordinary soldiers, many of whom had never traveled far from home, suddenly thrust into a military culture being invented as they experienced it. The book examines political conflicts over preparedness, with isolationists fighting the draft and military buildup even as Germany conquered Europe. Dickson demonstrates that Pearl Harbor, while shocking, accelerated a transformation already underway - the two years before the attack were essential to creating the force that would prevail.