One-Armed Boxer (1972)

After a fight, the school of master Hang Tui has to face the opium dealer Chao and his thugs. After a first defeat, the treacherous Chao hires a bunch of ruthless mercenaries. Tien Lung, Hang Tui's best student, is the only survivor, but without one of his arm. He has to undergo very painful training to exact revenge on evil Chao and his deadly henchmen.