On this episode of Our American Stories, when Wild Bill Donovan penned a letter to President Roosevelt expressing the need for the United States to have special forces units in WWII (which would eventually become the OSS and later the CIA), he looked back at America’s first modern conflict—the Civil War—and the group that attempted the first color revolution in history: the Confederate Secret Service. Patrick K. O'Donnell, author of The Unvanquished, tells the story of this secretive group that could have easily altered the course of the Civil War.

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