Which battle marked the end of Robert E. Lee's invasion of Maryland in September 1862?
Battle of Gettysburg
Battle of Antietam
Battle of Bull Run
Battle of Fredericksburg
Answer
Robert E. Lee's invasion of Maryland in September 1862 ended with the inconclusive Battle of Antietam, after which he retreated to Virginia. This was one of the bloodiest single-day battles in American history.