http://en.wikipedia.org/wiki/Betty_Duvall

Betty Duvall (1845–1891) was a Confederate spy during the US Civil War. She is descended from the Emigrant, Mareen Duvall.

Washington D.C.-based spy Rose O'Neal Greenhow gave Betty a note about a Union plan for the first Battle of Manassas (or Bull Run) to give to General P.G.T. Beauregard. Duvall carried it tucked in her hair.

She continued to be a spy and for one of her missions she brought her cousin. She spent the rest of her life as a spy.