The correct answer is Tubman was an abolitionist who worked as a spy for the Union army to help the war effort.
Harriet Tubman is one of the most famous women in American history, as she was a conductor on the Underground Railroad. This series of secret hideouts and safe homes allowed slaves from the South to escape to freedom in the Northern US or Canada. Along with this, Tubman also worked as a spy for the federal government during the Civil War. By making frequent trips to the South and pretending to be a slave, Tubman was able to gain confidential information by listening to conversations between Confederate officers.