A Sung dynasty-era massacre is perpetrated on the Yang family by General Pan Mai and his Mongol allies, which leaves only two of the large family's males alive. The sixth son is driven mad by his experiences. The fifth son travels the countryside and meets General Pan's troops and barely escapes with his life. Lady Yang orders her daughter, the eighth Yang, to disguise herself as a man and bring the fifth Yang home. When she is captured, number five must leave his hiding place to save her.