 The trip was drastically altered due to friction with the Osage Indians and Spanish colonial officials, resulting in a shorter journey.On October 16, 1804, Dunbar and Hunter set off with a party of 15 on the expedition, which lasted just under three months.They explored the Red River and the Black and Ouachita rivers, and brought back a wealth of scientific information, geological surveys, records of flora and fauna as well as the first detailed chemical analysis of the Hot Springs of Arkansas.