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 Friday July 13, 1866 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. The post was named for Maj. Gen. Philip Kearny, a popular figure in the American Civil War. The fort should be distinguished from the similarly named Fort Kearny in Nebraska, which was named for Kearny's uncle Stephen W. Kearny.