A detailed account of the battle of Antietam that clarifies the epic struggle Unfurl Those Colors! examines the operational fabric of leadership and command in the Army of the Potomac during one of the most critical campaigns and battles of the Civil War. The Battle of Antietam remains "the bloodiest single day of combat in American history" with over 5,000 killed, 20,000 wounded, and 3,000 missing. Many eminent Civil War historians consider it the turning point of the war. As a result of the perceived Federal success at Antietam, Abraham Lincoln was