“Blood on His Spurs” by L. Ron Hubbard
Publication date: September 1949
Original publication: Thrilling Western
Story description: Two bitter enemies—Bates and McLean—bury their feud long enough to save McLean’s son from certain death and wipe out a band of rustlers at the same time.
Currently available as part of the Stories from the Golden Age series, in the title Gun Boss of Tumbleweed.