The Arikara War of 1823 between the US and the Arikara took place near the Missouri River. Arikara warriors had previously attacked a trapping expedition traveling on the river. The US responded with a force of 230 soldiers, 750 Sioux, and 50 trappers. This was the first military conflict between the US and the western native Americans, setting the tone for future encounters between Americans and the Crow and Blackfeet. The Arikara were not completely defeated.