The Deadly Trackers

The Deadly Trackers is a 1973 American western film directed by Barry Shear and starring Richard Harris, Rod Taylor and Al Lettieri. It is based on the novel Riata by Samuel Fuller.

The film began as a project written and directed by Sam Fuller, Riata, starring Richard Harris and Bo Hopkins. Production was halted during filming and then reassembled with a new director and cast the only one of the original cast to return was Harris.

Source: Wikipedia