The Yuma Expedition was a U.S. Army military operation from 8 February 1852, to October, 1852 in the Yuma War. == First Establishment of Camp Yuma == Following the failure of the California Militia against the Quechan people (Yuma Indians), in the Gila Expedition, the U. S. Army sent the Yuma Expedition under Captain Samuel P. Heintzelman, to esta...