It took me 45 minutes to realize that I had already seen this movie about 10 years ago. I guess that's kind of indicative of the quality of the movie -- it's pretty dull. Think of this movie as Western-style 12 Angry Men: 3 dudes are accused of murder, and Peter Fonda defends their innocence, as the rest of the gang is pretty gung-ho about hanging them. I will say that the film's climax [whether these guys will live or die] is pretty emotional.
Oh yeah, and Anthony Quinn plays an ambiguously ethnic brown person in this.