Not an Italian western — no matter how many YouTube channels tell you so — this movie was also released as Pursuit and A Man Called She. It stars Ray Danton, once the husband of Julie Adams and the narrator of Psychic Killer, as Yellow Shirt.
Shot under the title Sh’e ee Clit Soak (The Man Who Wore the Yellow Shirt in Apache), Yellow Shirt seeks revenge against the U.S. Calvary who killed most of his people.
Some sites report this as being directed by Tom Quillen, who could also be Vern Piehl or Vincent Powers. Vern Piehl was also the producer of this movie. They could be the same person. Or Quillen could be a stage director associated with the Arizona Repertory Theater and the Phoenix Musical Theater Guild. It was written by Dewitt and Jack Lee, who also wrote The Legend of Jedediah Carver.
Honestly, the question of who directed this is way more interesting than what they directed.
You can watch this on Tubi.