The Ox-Bow Incident (movie, 1942)

Gil Carter and Art Croft ride into a small Nevada town plagued by cattle thieves. Initially suspected of being the rustlers themselves, Carter and Croft eventually join a posse out to get the criminals, who also may be involved in a recent shooting. When the posse closes in on a group that could be the fugitives, they must decide on a course of action, with numerous lives hanging in the balance.