From the record
“The Dull Knife Battlefield is located on the eastern slope of the Bighorn Mountains in Johnson County, Wyoming near Kaycee. It was the scene of the Dull Knife Fight on November 25, 1876, in which the Fourth Cavalry under General Ranald S.”
Wikipedia article Dull Knife Battlefield, CC BY-SA 4.0.
One of 22 National Register listings published here for Johnson County · listed in 1979 · category: Site.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service