From February to July of 1863, Grand River and Uinta Ute Indians had been raiding the mail line west of Fort Halleck, Wyo., stealing 173 horses and 34 mules from the U.S. Army. A detachment of Colorado Cavalry joined with Kansas Cavalrymen, totaling 70 Soldiers, to search for these Utes. On the morning of July 7, 1863, 250 Utes opened fire on the Soldiers who, despite their numerical disadvantage and despite being in the low ground, fought for two hours. The Soldiers eventually broke through the Utes' line and the Indians turned and fled. The fight left Fort Halleck in a more secure state.