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. Today, the fort and the nearby Fetterman and Wagon Box battle sites are maintained by the State of Wyoming as the Fort Phil Kearny State Historic Site.