List 3 Reasons why this battle was the "fiercest and bloodiest kind."

The Civil War was America's bloodiest conflict. The unprecedented violence of battles such as Shiloh, Antietam, Stones River, and Gettysburg shocked citizens and international observers alike. Nearly as many men died in captivity during the Civil War as were killed in the whole of the Vietnam War. if you were not looking for this answer i am sorry, but you did not list which battle