American Civil War, 1861-1865; Armed Forces; Bull Run, 2nd Battle of, Va., 1862; Prisons; Prisoners of War; Chancellorsville, Battle of, Chancellorsville, Va., 1863; Gettysburg, Battle of, Gettysburg, Pa., 1863; Diet; Food; Military camps; Battles; Virginia; American Civil War, 1861-1865; Pennsylvania; American Civil War, 1861-1865; Maryland; American Civil War, 1861-1865; Charleston (S.C.); American Civil War, 1861-1865