Harriet Tubman. Clara Barton. Sojourner Truth. Harriet Beecher Stowe. These and many other women were important actors who had a significant influence on the United States during the Civil War. At the time they and their fellow female trailblazers were underestimated because of the social norms of the era. But over time they came to be seen as indispensable in many fields, not only nursing, but also, strangely enough, espionage. Their actions were...