This remarkable 1964 film has many virtues, among them a strong script, fine photography, and a pre-Kirk William Shatner (whose idiosyncratic acting style is already well-developed, however).
The story is a Westernization of "Rashomon", the story of a rape and murder told from the points of view of three participants and an outsider. The contrast between the subjective stories (told by the bandit, the husband, and the wife) and the story told by the miner who witnesses what really happens is both hilarious and thought provoking.
Everyone is in fine form, but DaSilva's miner and Edward G. Robinson's snake oil salesman are especially fine. Newman's portrayal of the Mexican bandit is often over-the-top, but always interesting.
This is one of those movies that makes one wonder if Mr. Maltin saw the same thing. I think that it is one of the better films of the 60's, a decade that produced a great many of the best movies ever made.