Camp Douglas, located in Chicago, Illinois, became a prisoner-of-war camp in February 1862 when General Grant captured Fort Donelson and sent between 8,000 and 9,000 captured Confederates to the prison. Over the course of its existence the prison housed upwards of 30,000.
The prisoners stayed in barracks. The prison had an inadequate sanitary system, sometimes poor food, not enough clothing or blankets, inept and inaccurate record keeping, confused leadership and oftentimes cruel discipline. Death came from diseases such as typhus, dysentery and smallpox, but mostly from the cold. A total of 3,759 prisoners died at Camp Douglas. They were buried at Oak Woods Cemetery. Located within the cemetery is the Confederate Mound Monument, which notes that this is the largest burial site for Southern soldiers in the North.