匈(xiong)奴(nu)分裂为(wei)南北两部之(zhi)后,乌桓族各部(bu)趁(chen)机脱离了(le)匈奴(nu)的统(tong)治,汉武帝击败匈奴后,迁(qian)乌桓(huan)于止谷(gu)、渔阳、右北平、辽东、辽西(xi)五郡边塞,始置护乌桓(huan)校尉,持节监(jian)护(hu)乌(wu)桓各部(bu)不得与匈(xiong)奴通。汉与南(nan)匈奴对抗时,各部乌(wu)桓亦各自为政,或(huo)从汉(han)攻匈奴,或(huo)从(cong)匈奴(nu)联兵攻汉。汉还频(pin)频利用(yong)乌桓(huan)骑兵镇压各地义军。
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