Jeremiah Johnson is a 1972 western directed by Sydney Pollack and starring Robert Redford and Will Geer. I have the DVD. I don't see it available free anywhere or through any of the subscription services. It's odd what's not available through streaming services.
Rotten Tomatoes has a critics consensus score of 95%. Empire Online concludes, "Pollack does right to put his faith in one man and a whole lot of mountains. The result is impressive."