Mary Bowser was born a slave and later became a spy for the Union Army.

Mary Bowser for a spy for the Union Army during the Civil War. 

Mary Bowser was an African American woman who participated in a Union spy ring. 

General Grant led the Union Army during the Civil War.  He later became President of the United States. 

Mary Bowser was a spy for the Union Army. 

Nat Turner was a slave who led a slave revolt several years before the Civil War. 

Harriet Tubman was a conductor on the Underground Railroad before and during the Civil War. 

General "Stonewall" Thomas Jackson.

Harriet Tubman worked as a conductor on the Undrground Railroad and a spy for the Union Army during the Civil War. 

Mary Bowser was born into slavery but was given her freedom during the Civil War.  She went on to become a spy for the Union Army.