Drawing (photograph copy) of the Old University of Chicago's campus with Camp Douglas in the background. Camp Douglas, one of the most brutal of all northern Civil War prisons, stood south of Chicago on land donated by the family of Illinois Senator Stephen A. Douglas. The bodies of an estimated 6,000 prisoners who died in the camp are interned in a trenched grave Oak Woods Cemetery, the largest Confederate gravesite outside of the South. The prison camp was in operation concurrently with the University.