More than anything, Civil War soldiers feared becoming a prisoner of war. Among the deadliest prisons for Confederates was Rock Island Prison in Illinois. One of the most notorious for Northern prisoners was Georgia's Camp Sumter - better known as "Andersonville." Dysentery, starvation, exposure to harsh weather, and brutal mistreatment killed more men in prisons than were killed at Gettysburg, the war's deadliest battle. The gruesome reality of Civil...