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I read somewhere that most zombie films are just retreads of specific Westerns that feature a 'last stand against overwhelming horde' act.
John Carpenter's Assault on Precinct 13 is an (ostensibly police) crossover:
https://en.m.wikipedia.org/wiki/Assault_on_Precinct_13_(1976_film)
inspired by the Howard Hawks Western film Rio Bravo and the George A. Romero horror film Night of the Living Dead.[3]
But then Zulu and some WW2 Pacific films (and probably others that need an 'of their time' caveat) fit into that too.
film thread
Fargo.
Later seasons of Fear of the Walking Dead. Be warned there are a fuck-tonne of shit seasons to go through first, but the later ones are great at marrying the western genre.
Young Guns.
Young Guns 2.