From the record
“Fort Cobb was a United States Army post established in what is now Caddo County, Oklahoma in 1859 to protect relocated Native Americans from raids by the Comanche, Kiowa, and Cheyenne. Emory at the beginning of the Civil War, but then occupied by Confederate forces from 1861-1862.”
Wikipedia article Fort Cobb, CC BY-SA 4.0.
One of 11 National Register listings published here for Caddo County · listed in 1973 · category: Site.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service