Dou Xian
The picture drastically changed in the later years of reign of Emperor He, son of Emperor Zhang. [[Dou Xian]] (50s–92), brother-in-law of Emperor Zhang through his sister Empress Duo, utterly defeated the Northern Xiongnu in a series of campaigns during the "Yongyuan" era (89–105). The remnants just escaped annihilation, conceded defeat, began migrating out of the Mongolian steppes and disappeared as a distinct group of herdsmen once and for all. Others were assimilated into other tribes by intermarriage: the [[Yuwen]] tribe being a good example.