For other conflicts involving the Apache see Apache War (disambiguation). The Apache Campaign of 1896 was the final United States Army operation against Apaches who were raiding and not living in a reservation. It began in April after some Apaches killed three American settlers in Arizona. The Apaches were pursued by the army, which caught up with them in the Four Corners region of Arizona, New Mexico, Sonora and Chihuahua. There were only two important encounters during the campaign and, because both of them occurred in the remote Four Corners region, it is unknown if they took place on American or Mexican soil.