The Battle of Bear Valley was a small engagement fought in 1918 between a band of Yaquis and a detachment of United States Army soldiers. On January 9, 1918, elements of the American 10th Cavalry Regiment detected about thirty armed Yaquis in Bear Valley, Arizona, a large area that was commonly used as a passage across the international border with Mexico. A short firefight ensued, which resulted in the death of the Yaqui commander and the capture of nine others. Though the conflict was merely a skirmish, it was the last time the United States Army and Native Americans engaged in combat and thus has been seen as the final official battle of the American Indian Wars.