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Chang Cheh takes the director's chair for this martial arts adventure produced by the Shaw Brothers and set during the final years of the Tang Dynasty. The Chinese Emperor has requested that barbarian chieftain Li Ke-yung (Ku Feng) recapture the capitol city, which has recently fallen under the rule of a powerful rebel leader. In order to accomplish this formidable task, Ke-yung calls on his thirteen sons, each of whom are powerful fighters. Li Shih-szu (Ti Lung) and Li Tsun-hsiao (David Keung) in particular are more than up to the task, and may be cunning enough to successfully plan and execute this dangerous mission.