Timothy H. O'Sullivan 1871-1874 (survey), 1873 (expedition) 29. Navajo Brave and his Mother. The Navajos were formerly a warlike tribe until subdued by U. S. Troops in 1859-60. Many of them now have fine flocks, and herds of horses, sheep, and goats. [Wheeler Survey, Explorations and Surveys West of the 100th Meridian]