This is one of those films that nearly loses you, but in the end rewards you for sitting through it. It makes for a very good view, despite its leisurely pace at times.
In summary Anthony Quinn stars as a outlaw that is saved by Father John, whom he escorts to the village of San Sebastian. The village is deserted, with its cowardly residents hiding in the hills from indians, who pillage their crops and burn their buildings. When Father John is murdered, the outlaw is mistaken as the man of god by the villagers, and assists them in regaining their confidence and defending themselves.
Quinn is superb in his role, complimented by Charles Bronson, who plays the bad guy "half breed" Teclo. Sam Jaffe's Father Joseph character is also very likable.
Whilst the movie is quite slow in places, this only helps to plot out the story. Although casting the indians as the "bad guys", it does explain that the massacre of the villagers is no different than what the white man has done to their own race "in the name of god".
The soundtrack is again provided by Ennio Morricone and, whilst not his best work, does help provide the suitable atmosphere, borrowing heavily from some of his other compositions.
Definitely worth a view.