Harriet Tubman is known for her work on the Underground Railroad. But she was also an important spy in the Union Army during the Civil War. In this graphic nonfiction title, readers will learn about her daring exploits to help the Union achieve victory in its fight against slavery. Detailed illustrations and engaging captions bring the events of this story to life on the page. A timeline, a map, and real-life quotes add additional historical detail for readers to explore.