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.
Duke University
Special Collections Library: Rose O;neal Greenhow Papers
A fascinating look at the documents concerning Rose O'Neal Greenhow. Included are letters she wrote from prison.
Duke University
Duke University: Special Collections Library: Rose O'neal Greenhow
This article is about Rose Greenhow, her life, and the important roles women played in the war.
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.
Duke University
Civil War Women: Online Archival Collections
A Special Collection from Duke University. The site contains original source documents and further Internet resources about women during the Civil War.
Curated OER
Rose O'neal Greenhow and Her Daughter Rose
This site has photographs and paintings of Civil War leaders, both political and military. Clicking on the arrow will take you through pictures and brief biographies of the leaders. From the National Portrait Gallery.