Towne, Stephen E., 1961-2016-01-072016-01-072015-12"Quelling the Camp Douglas Conspiracies," Chicago History xl, number 1 (Winter, 2015), 26-39.https://hdl.handle.net/1805/7991During the American Civil War, U.S. Army detectives spied on Confederate agents in Chicago and the Midwest who aimed, in collaboration with Northern sympathizers, to subvert the federal government. In 1864, army detectives and spies succeeded in infiltrating plots to release Confederate prisoners-of-war held in Camp Douglas, near Chicago. Military commanders broke up the plots, arrested some of the leaders, and tried them by military commission.en-USUnited States HistoryCivil War 1861-1865Chicago, IllinoisUnited States ArmyespionagesubversionSons of LibertySamuel P. HeintzelmanBenjamin J. SweetUnited States -- History -- Civil War, 1861-1865Chicago (Ill.)United States. ArmyEspionage -- United StatesSubversive activities -- United StatesSons of Liberty (1864)Heintzelman, Samuel Peter, 1805-1880Sweet, Benjamin J.Article