一南北匈奴的分裂和北匈奴的西迁东汉初年,分布在北方边陲的草原部落和部族,一为蒙古高原的匈奴,一为辽河两岸的乌桓、鲜卑,一为甘陇一带的氐、羌。其中以已经进入奴隶制阶段的匈奴最为强大,至于尚在氏族制阶段的乌桓、鲜卑、氐、羌,还不免要受到匈奴势力的威胁,有的还只是匈奴的附庸。匈奴的统治阶级为了增殖自己的财富,经常带领乌桓、鲜卑的武装,向长城以南的汉族地区进行寇掠。后汉书卷一百二十鲜卑传“光武初,匈奴 A split between the north and south Huns and the North Xiongnu to the early years of the Eastern Han Dynasty, located in the northern margin of the prairie tribes and tribes, one for the Huns of the Mongolian Plateau, one for the Liaohe River Wuhuan, Xianbei, one for the Gansu Gansu, Qiang. Among them, the Huns that have entered the stage of slavery are the most powerful. As for the Wuhuan, Xianbei, Qiang and Qiang, still under the clan system, they are still threatened by the Huns. Some are even the vassals of the Huns. In order to proliferate their own wealth, the ruling class of the Huns often led Wuhuan and Xianbei armed forces and carried out a swear over the Han area south of the Great Wall. The Han Dynasty volumes one hundred and twenty Xianbei Biography "Guangwu early, Xiongnu