In the Civil War, battles raged in more than 20 states. The war between North and South remains the bloodiest in U.S. history. The casualties of the Battle of Gettysburg numbered more than 50,000 alone, and the day the Battle of Antietam was fought September 17, 1862 is recorded as the deadliest single day in U.S. military history. Find out what happened in the wars largest battles to cause the devastation that still scars the nation today.