Battle of Bear Valley: The last battle of the American Indian Wars.

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 of Buffalo Soldiers detected about thirty armed Yaquis in Bear Valley, west of Nogales, 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.

The American Indian Wars, also known as the American Frontier Wars, and the Indian Wars, was a conflict initially fought by European colonial empires, the United States, and briefly the Confederate States of America and Republic of Texas against various American Indian tribes in North America. These conflicts occurred from the time of the earliest colonial settlements in the 17th century until the end of the 19th century. The various wars resulted from a wide variety of factors, the most common being the desire of settlers and governments for Indian tribes' lands. The European powers and their colonies enlisted allied Indian tribes to help them conduct warfare against each other's colonial settlements. After the American Revolution, many conflicts were local to specific states or regions and frequently involved disputes over land use; some entailed cycles of violent reprisal.

January 9 is the ninth day of the year in the Gregorian calendar; 356 days remain until the end of the year.