Spencer Tracy's character gets off a train in the titular desert town, spends a few hours opening an industrial-strength can of whupass on the local band of murderous bigots, then gets back on the train and goes on his way. And he does all this with only one functional arm.
Specifically the scene in the diner where Tracy beats the crap out of Coley Trimble (Ernest Borgnine) with just one arm using karate skills he learned in the army.
Trimble: You're a yellow-bellied Jap lover! Am I right or wrong?
Macreedy: You're not only wrong. You're wrong at the top of your voice.