Badman's Country (1958)

Pat Garrett (George Montgomery) has retired from law enforcement and is on his way to Abilene, Kansas, to meet his sweetheart. He learns that Butch Cassidy (Neville Brand) and his gang are preparing to rob an incoming train carrying half a million dollars, so Garrett calls in Wyatt Earp (Buster Crabbe) and a few other lawmen to move some of Cassidy's gang they've already arrested. When the Abilene locals refuse to stand up to Cassidy and his outlaws, Garrett must take matters into his own hands.