Native American uprising in 1905 South Dakota?

This is a purported train order from 1905 referencing “Indians reported on the warpath on right of way between Ardmore and Rumford.” Ardmore and Rumford are in the southwest corner of South Dakota, and Orella is nearby in northwest Nebraska. http://cdn.amtraktrains.com/uploads/monthly_06_2015/post-252-0-97030300-1434754001.jpg

Was there really an uprising as late as October 1905, or a real but exaggerated incident? And yes, I realize it could be a real train order based on a false report (e.g. train order office in Ardmore wanted to slack off) or completely fake.

The last Indian uprising was in 1923.

A five-second Google search revealed: http://historytogo.utah.gov/utah_chapters/american_indians/theutetrektosouthdakotain1906.html

You could kind of say the last Indian uprising was in 1973.

Or, perhaps, that that was the most recent one.

According to the book of knowledge, the American Indian Wars lasted from 1622 to 1924. With regard to the last incidents, it says: