Harriet Tubman was born into slavery in 1820s Maryland but escaped in 1849, becoming a "conductor" on the Underground Railroad who made over 13 missions to rescue over 300 slaves. She helped guide slaves to freedom using secret codes and routes, and once pointed a gun at a fugitive slave wanting to turn back to ensure he didn't expose the operation. Tubman later worked as a nurse and spy for the Union Army during the Civil War, and spent her later years advocating for women's suffrage before passing away in 1913.