Though best known for conducting enslaved members of her family and many other slaves to freedom via the Underground Railroad, Harriet Tubman also aided the cause of liberty by becoming a spy for the Union during the Civil War.
A particular set of skills
In her years of guiding people away from slavery on the Underground Railroad, Harriet Tubman had to arrange clandestine meetings, scout routes without drawing attention to herself and think on her feet. And though she was illiterate, she’d learned to keep track of complex amounts of information. These were all skills that any aspiring spy would do well to acquire.
See also : Harriet Tubman – Wikipedia