Fort Phil Kearny State Historic Site

Fort Phil Kearny was an outpost of the United States Army that existed in the late 1860s in present-day northeastern Wyoming along the Bozeman Trail. Construction began in 1866 on Friday, July 13, by Companies A, C, E, and H of the 2nd Battalion, 18th Infantry, under the direction of the regimental commander and Mountain District commander Colonel Henry B. Carrington.

Source: Wikipedia