Most know Harriet Tubman for her groundbreaking work with the Underground Railroad and, later, as an abolitionist, but as National Geographic wrote, Tubman was also an integral part of the Civil War. In 1863, Tubman and Colonel James Montgomery led a group of soldiers in freeing slaves from plantations in South Carolina, making Tubman the first woman in US history to lead a military expedition, according to National Geographic. Her work continued as a spy and recruiter for the Union Army. This operation was so covert that only President Lincoln knew about it. Tubman received compensation for her military contributions...