Harriet Tubman, a conductor on the Underground Railroad, was a spy for the Union during the Civil War, eventually leading raids on plantations in South Carolina that freed over 700 slaves.
Comedy Central’s Drunk History show does a hilarious take on her wartime heroics:
While it is hilarious, it is based on a true story. Much of this seems based in part on the book Harriet Tubman, Secret Agent: How Daring Slaves and Free Blacks Spied for the Union During the Civil War, by Thomas B. Allen, which is a good read.
Crissle West of The Read does most of the voice-over for this video.