Harriet Tubman's contributions were, that she helped free slaves from slave owners in the South. She helped free slaves in one way, but she used many different tactics. THe one way she used to free slaves was using the Underground Railroad, which was a network used to bring slaves to the North. they were brought to the North because slavery was no longer allowed. IN total she managed to rescue 300 slaves without being seen or caught. Some of the tactics that she used to free slaves are these. one tactic she would use was that she would wear various disguises to escape being noticed. Another tactic she would use was that she carried sleeping powder with her. she would use the sleeping powder to give the babies so they wouldn't cry and give them