At the same time that he charged Meriwether Lewis and William Clark to explore the great Northwest, President Thomas Jefferson commissioned William Dunbar and George Hunter to make a parallel journey through the southern unmapped regions of the Louisiana Purchase. From October 16, 1804, to January 26, 1805, Dunbar and Hunter, both renowned scientists, made their way through what is now northern Louisiana and southern Arkansas, ascending the Ouachita River and investigating the natural curiosity called "the hot springs." The Forgotten Expedition, 1804-1805 represents the first time that...