Born into slavery in Dorchester County, Maryland, Tubman was beaten and whipped by her various owners as a child. Early in her life, she suffered a traumatic head wound when an irate slave owner threw a heavy metal weight at her, intending to hit another slave. The injury caused disabling seizures, headaches, and powerful visionary and dream activity, and spells of hypersomnia which occurred throughout her entire life. A devout Christian, she ascribed her visions and vivid dreams to premonitions from God.

In 1849, Tubman escaped to Philadelphia, then immediately returned to Maryland to rescue her family. Slowly, one group at a time, she brought relatives with her out of the state, and eventually guided dozens of other slaves to freedom. Traveling by night and in extreme secrecy, Tubman (or “Moses”, as she was called) “never lost a passenger”. Heavy rewards were offered for many of the people she helped bring away, but no one ever knew it was Harriet Tubman who was helping them. When a far-reaching United States Fugitive Slave Law was passed in 1850, she helped guide fugitives further north into Canada, and helped newly-freed slaves find work.