Camp on Pawnee Fork (1859-60); Camp Alert (1860) - Credit: Wikimedia Commons
The Camp on Pawnee Fork, later renamed Camp Alert, was founded by the U.S. Army to protect a mail station being built at a site called Pawnee Fork. This station, on the Santa Fe Trail was threatened by Kiowa and Comanche Indians who wanted the site left vacant. The first company of cavalry troops arrived Sept. 1, 1859. Read more on Wikipedia
Source: en.wikipedia.org