American Civil War, 1861-1865; Armed Forces; Prisons; Slaves; Horses; Railroads; Pea Ridge, Battle of, Ark., 1862; Battles; Arkansas; American Civil War, 1861-1865; Illinois; American Civil War, 1861-1865; Missouri; American Civil War, 1861-1865; Fort Donelson, Battle of, Tenn., 1862; Tennessee; American Civil War, 1861-1865; Prisoners of War