匈奴(nu)分(fen)裂为南北两部之后,乌桓族各部(bu)趁机脱离了匈奴的统治,汉武帝击(ji)败匈(xiong)奴后,迁乌(wu)桓(huan)于止谷(gu)、渔阳、右(you)北平、辽东、辽西(xi)五(wu)郡边(bian)塞,始置护(hu)乌(wu)桓校尉(wei),持节监(jian)护乌桓各(ge)部不得(de)与匈(xiong)奴通。汉(han)与南匈奴(nu)对抗时,各部乌桓亦(yi)各自为政,或从汉攻(gong)匈奴,或(huo)从匈(xiong)奴联(lian)兵攻(gong)汉(han)。汉还频频利(li)用(yong)乌(wu)桓骑兵(bing)镇压各地(di)义(yi)军。
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