“Hoss Tamer” by L. Ron Hubbard
Publication date: January 1950
Original publication: Thrilling Western
Story description: A luckless ex-circus horse trainer foils the Gopher Hole Gang’s attempt to rob a Wells Fargo money shipment, using his horse training skills and a bit of ingenuity.
Currently available as part of the Stories from the Golden Age series, in the title Under the Diehard Brand.