A study of Union prisoners in Confederate prisons In Captives in Blue , Roger Pickenpaugh examines the ways the Confederate army contended with the growing prison population, the variations in the policies and practices of different Confederate prison camps, the effects these policies and practices had on Union prisoners, and the logistics of prisoner exchanges. He explores conditions that arose from conscious government policy decisions and conditions that were the product of local officials or unique local situations. He also considers how Confederate prisons and policies dealt with African American Union soldiers. Black soldiers held captive in Confederate prisons faced uncertain fates; many former slaves were returned to their former owners, while others faced harsh treatment in the camps. Drawing on prisoner diaries, Pickenpaugh provides compelling first-person accounts of life in prison camps often overlooked by scholars in the field. This study of Union captives in Confederate prisons is a companion to Roger Pickenpaugh's earlier groundbreaking book Captives in Gray: The Civil War Prisons of the Union and extends his examination of Civil War prisoner-of-war facilities into the Confederacy.