How many people were killed or wounded in the Battle of Antietam?
There were over 23,000 men killed, wounded, or missing after the end of the Battle of Antietam.
September 17, 1862 was the bloodiest single day in US history: The Battle of Antietam 23,100 wounded, missing and dead. Over 2000 of those people were killed Battle of Antietam was the bloodiest day of the civil war. It prevented the South from getting foreign allies and turned the tide of the war to slavery.
The Battle of Pea Ridge, Arkansas was fought March 7-8, 1862. There were about 1300 US casualties in killed, wounded and missing. The Confederates lost about 2000 men killed, wounded, or missing. It was a Union victory. The US dead amounted to 203, while the Confederate dead were estimated at about 600.