A significant source of information on the Underground Railroad in Indiana is William Cockrum's 1915 work, History of the Underground Railroad, as It Was Conducted by the Anti-Slavery League. According to Cockrum, Posey owned a ing that served as a way station for as many as 1000 escaped slaves. (This is one of the rare instances in which the underground railroad was actually subterranean.) Posey married Sarah Blackburn in 1838. He was the father of Francis B. Posey.