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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.
Other
U.s. Centennial of Flight Commission: Balloons in the American Civil War
What role did hot air balloons play in the Civil War? This comprehensive article answers that question and gives specific examples of their use by both the Union and Confederate troops.
University of California
Department of Geography: u.s. Army Balloon Corps
Pictures of hot air balloons in the Civil War and a brief explantation of their use.