Un petit poble mexicà prop de la frontera amb els Estats Units és assetjat per una banda de malfactors, dirigits pel sanguinari Calvera, que roben als pagesos el fruit de les seves collites. Els habitants del poble decideixen demanar ajuda a uns pistolers professionals nord-americans, ja que els resulta més barat que comprar armes.
An ex-con seeks revenge on the man who put him in prison by planning a robbery of the latter's stagecoach, which is transporting gold. He enlists the help of a partner, who could be working for his nemesis.
Grant MacLaine, a former railroad troubleshooter, lost his job after letting his outlaw brother, the Utica Kid, escape. After spending five years wandering the west and earning his living playing the accordion, he is given a second chance by his former boss.
A famous gunman decides to change his life around and turn himself in when amnesty is declared by the new governor of the New Mexico Territory, but a vindictive sheriff sets out to stop him from reaching the Territory.