My great great uncle was in Tennessee when the war broke out. In May, 1861, he joined Henderson's Scouts. He was in many skirmishes and did considerable scouting. He was first taken prisoner near Holly Springs, Miss., and retained at Cairo, Ill., for about one month when he was exchanged. After returning to Hendersons Scouts was again captured in 1863 at Walnut Hills, Miss near Vicksburg and sent to Rock Island where he remained until the close of the war. As you probably know the prison received a mixed reputation.
Perhaps the Confederate mass graves you mentioned were prisoners from Camp Douglass in Chicago?
Prison conditions on both sides were less than tolerable with many men dying from disease such as small pox and also malnutrition. In 1903 the United States Chief Record and Pension Office reported that twenty-five thousand, nine-hundred, and seventy-six Southerners and thirty thousand, two-hundred, and eighteen Northerners perished in Civil War prisons. I dont know how accurate that number is. History may never know their names or their personal sacrifices but it is good that we occasionally pause and reflect upon such things.
Thanks for the post. Please post a book review if you read it.