The Battle of Antietam, fought on September 17, 1862, was the bloodiest single day in American history, with more than 6,000 soldiers killed four times the number lost on D Day, and twice the number killed in the September 11th terrorist attacks. InCrossroads of Freedom, America’s most eminent Civil War historian, James M. McPherson, paints a masterful account of this pivotal battle, the events that led up to it, and its aftermath.