Goin' South (1978) - The Ex Moon Gang

Due to the lack of men after the Civil War, a small western town allows a bachelorette with ulterior motives to save a horse thief from the gallows by marrying him. They must deal with his old gang, the Sheriff, the bank, and each other.

[@The-Deadite]

I never knew Jack Nicholson worked in a western or had a beard, this is so weird.