Walla Walla County, in territory of both the Cayuse and the Nez Perce Indian tribes. The rival missionaries competed for the attention of Cayuse noble Tawatoy. Similar terms were later impressed upon the Cayuse. Due to their defeat the Cayuse were much reduced. The mission was in the Cayuse territory. The subsequent OH-6 Cayuse first flew in February 1963. The Cayuse called themselves the Liksiyu in the Cayuse language. A measles outbreak in November 1847 killed half the local Cayuse. The Cayuse and Chinook Passes east of Mount Rainier also close in winter. The Cayuse language is a language isolate. In 1847 an epidemic of measles killed half the Cayuse. This attack prompted an armed response by the United States and the Cayuse War ensued. Several Cayuse ate the deadly meat but survived. The Cayuse resented the encroachment of white settlers. The Cayuse involved in the incident had previously lived at the Waiilatpu mission.