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Central Intelligence Agency
Cia: Intelligence in the Civil War [Pdf]
A multi-topic look at intelligence gathering, the tools used, and the people involved in both the North and the South during the Civil War. Comprehensive, interesting coverage from the CIA.
Civil War Home
Home of the American Civil War: Elizabeth Van Lew
A biography of the eccentric Union spy, Elizabeth Van Lew, also known as "Crazy Bet" from "Spies for the Blue and Gray" by Harnett T. Kane.
Other
Signal Corps Association: Espionage in the Civil War
Read about the murky underground stories of espionage on both sides of the Civil War. The spies were often eccentric, and the raiders ruthless.
A&E Television
Secret Agents in Hoop Skirts: Women Spies of the Civil War
Find out more about Rose O'Neal Greenhow and three other female informants who played a significant role in America's bloodiest conflict, the Civil War.