Winterhawk

Winterhawk is a 1975 American Western film co-written, produced and directed by Charles B. Pierce. Starring Leif Erickson, Woody Strode, Denver Pyle, L.Q. Jones, Michael Dante and Elisha Cook Jr., the story concerns a Blackfoot chief who attempts to get help for his tribe who have been infected by smallpox. He is betrayed by the people from whom he seeks help.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.