Fort Union National Monument is a unit of the National Park Service of the United States, and is located north of Watrous in Mora County, New Mexico. The national monument was founded on June 28, 1954. The site preserves the second of three forts constructed on the site beginning in 1851, as well as the ruins of the third. Also visible is a network of ruts from the Mountain and Cimarron Branches of the old Santa Fe Trail. There is a visitor center with exhibits about the fort and a film about the Santa Fe Trail. The altitude of the Visitor Center is 6760 feet (2060 m). A 1.2-mile (1.9-kilometre) trail winds through the fort's adobe ruins. Description by William Davis Santa Fe trader and author William Davis gave his first impression of the fort in the year 1857: Fort Union, a hundred and ten miles from Santa Fé, is situated in the pleasant valley of the Moro. It is an open post, without either stockades or breastworks of any kind, and, barring the officers and soldiers who are seen about, it has much more the appearance of a quiet frontier village than that of a military station. It is laid out with broad and straight streets crossing each other at right angles. The huts are built of pine logs, obtained from the neighboring mountains, and the quarters of both officers and men wore a neat and comfortable appearance. History of the fort The fort was established in the New Mexico Territory, on the Santa Fe Trail. It was provisioned in large part by farmers and ranchers of what is now Mora County (formally created in 1860), including the town of Mora, where the grist mill established by Ceran St. Vrain in 1855 produced most of the flour used at the fort. The fort served as the headquarters of the 8th Cavalry in the early 1870s and as the headquarters of the 9th Cavalry in the late 1870s during the Apache Wars. F. Stanley wrote and published a book titled Fort Union New Mexico in 1953, giving a colorful history of this fort and individuals such as Davey Crockett. Land ownership In its forty years (1851–1891) as a frontier post, Fort Union had to defend itself in the courtroom as well as on the battlefield. When the United States Army built Fort Union in the Mora Valley in 1851, the