Hallie Murray 
Role of Female Union Spies in the Civil War [PDF ebook] 

Although not able to fight on the front lines of the Civil War, many brave women worked behind the scenes, engaged in daring acts of espionage and concealment. On the Union side, these covert operatives included actress Pauline Cushman, and abolitionist Elizabeth Van Lew, who used her considerable resources to create and operate a spy ring. Readers learn of the famed Underground Railroad operator Harriet Tubman. This engaging book spotlights seven of these hidden forces behind the Union’s victory in the Civil War whose often under-examined life stories will thrill Civil War and espionage buffs alike.