From the record
“Two Medicine Fight Site is a site on the National Register of Historic Places located roughly 25 miles southeast of Browning, Montana, within the eastern boundary of the Blackfeet Nation. The location was the site of the only violent encounter of the Lewis and Clark Expedition, on July 27, 1806.”
Wikipedia article Two Medicine Fight Site, CC BY-SA 4.0.
One of 3 National Register listings published here for Pondera County · listed in 1970 · category: Site.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service