This third movie in the series goes back to the turn of the century (19th to 20th that is) and concerns author Ambrose Bierce who traveled to Mexico to aid in the revolution but was never heard from again (see the book The Old Gringo by Carlos Fuentes). In this version of history, Bierce runs into some vampires at a saloon that becomes the bar in the first movie.
Bierce is looking for Pancho Villa to offer his services. But on his way he runs into outlaws, highwaymen, would-be outlaws, posses, a half-breed, a Fuller brush man, and lots of vampires.
Several plots bring all of the characters to the vampire saloon. There we see that even drunk Bierce would have been a fine addition to the revolution. But the usual biting and bloodletting ensues and we discover that the hangman's daughter is an important figure for the vampire (although I wonder how the newly-converted brush salesman knows enough to announce that she has come).
Although this film follows the previous films in pitting outlaws against vampires, this one has a different feel due to the historical setting and characters. It also sets the stage for the later events of the first movie. Bierce is a wonderful character and very nicely portrayed. I will not tell you if his historical disappearance is due to vampires or not.