 In 1823, territorial governor William Duval and James Gadsden signed the Treaty of Moultrie Creek, forcing Seminoles onto a four million acre reservation in central Florida.The Second Seminole War (1835–1842) was the longest war of Indian removal and resulted when the United States government attempted to move the Seminole people from central Florida to a Creek Reservation west of the Mississippi River.As a result of the Seminole War, Seminole prisoners were held captive in the Castillo de San Marcos, renamed Fort Marion after General Francis Marion, who fought in the American Revolution, in the 1830s.