#onthisday September 18th, 1849, Harriet Tubman, the most well-known conductor of the Underground Railroad, liberated herself from slavery. Upon finding refuge in Philadelphia, where the Quaker abolitionist movement thrived, Harriet made it her mission to help other slaves find freedom in northern states. However, in 1850 the U.S. government passed the Fugitive Slave Act, allowing all escaped slaves, upon capture, to be returned to their masters. Harriet continued her mission by guiding fugitives further north into Canada. Throughout her life, Harriet rescued more than 70 people from slavery and became a symbolic figure of the struggle for freedom. Learn more about the heroic Harriet with these select resources.