Which battle during the Civil War was the bloodiest battle in American history?

Battle of Antietam

Battle of Bull Run

Second Battle of Bull Run

Battle of Gettysburg

1 answer

The bloodiest battle in American history during the Civil War is the Battle of Antietam. It took place on September 17, 1862, and resulted in approximately 22,000 casualties, making it the single deadliest day in American military history.