article: Battle of Antietam
links: Army of the Potomac Sympathy Confederate States of America Second Battle of Bull Run Robert E. Lee American Civil War Army of Northern Virginia Richmond, Virginia James Longstreet Geological formation Tennessee Special Order 191 Manassas, Virginia Maryland Campaign President of the United States 1862 Peninsula Campaign Division (military) Border states (American Civil War) Stonewall Jackson United States Harpers Ferry, Iowa Abraham Lincoln Harpers Ferry, West Virginia Ambrose Burnside Major General Federal government of the United States Capital (city) Emancipation Proclamation Shenandoah Valley Washington, D.C. Union (American Civil War) Southern United States Lieutenant General Union army George B. McClellan Joseph Hooker Battle of South Mountain Battle of Gettysburg Frederick, Maryland Casualty (person) Withdrawal (military) Offensive (military) Missing in action September 17 Maryland Sharpsburg, Maryland Shenandoah River Europe