Battle of Antietam: September 17, 1862
Near Sharpsburg, Maryland, a single day of fighting changed the direction of the Civil War.
At a Glance
- Dates: September 17, 1862.
- Location: Sharpsburg, Maryland.
- Outcome: Tactically inconclusive; a strategic Union success.
What happened at Antietam?
Robert E. Lee brought the Army of Northern Virginia into Maryland. George B. McClellan confronted him near Antietam Creek. Union attacks struck different parts of Lee’s position throughout September 17.
The morning fighting centered on the Cornfield and nearby woods. Later, Union troops attacked the Confederate center along the Sunken Road, remembered as Bloody Lane.
To the south, Ambrose Burnside’s troops struggled to cross the creek. They eventually took the bridge and advanced toward Sharpsburg. Confederate reinforcements helped stop that advance.
Why did Antietam matter?
About 23,000 soldiers were killed, wounded, or missing in twelve hours of fighting.
Neither army destroyed the other on the battlefield. Lee subsequently withdrew from Maryland, ending his first northern invasion. That result gave Abraham Lincoln the opportunity to announce the preliminary Emancipation Proclamation on September 22.
The proclamation changed the war’s public purpose. Its January 1863 provisions applied to enslaved people in areas still in rebellion. They did not free every enslaved person throughout the country. Maryland, a slaveholding Union state, fell outside those provisions.
History Behind Steel and Honor
Antietam: From Secession to the Bloodiest Day connects this historical setting with Tom O’Connor’s Civil War fiction. Book 2 is published.
The historical summary above describes documented events. The novels tell fictional stories within that setting; this page does not assign invented actions to historical soldiers.
Follow Your Research
A regiment linked to a battle provides a research lead. It does not prove that every soldier in that regiment was present. Check service dates, hospital records, detached duty, and other evidence before drawing conclusions.
Use the chronological battle guide to place this engagement within the war. Continue with Gettysburg or explore the Steel and Honor reading order.
Get a free chapter of Cadets to Captains and meet the series at its beginning.
Historical Sources
- NPS: overview of the fighting
- NPS: McClellan and the battlefield outcome
- NPS: slavery and emancipation at Sharpsburg
These National Park Service accounts support the dates, military sequence, outcomes, and significance summarized here.