匈奴(nu)分裂为南北两部之后,乌(wu)桓族各部趁机脱离了匈(xiong)奴的统(tong)治,汉(han)武帝击败匈(xiong)奴后,迁乌桓于止谷、渔(yu)阳、右北平、辽(liao)东、辽(liao)西五郡边塞,始置(zhi)护(hu)乌桓校尉,持(chi)节监护乌(wu)桓各部不得与匈(xiong)奴(nu)通。汉与南匈奴对(dui)抗时,各部(bu)乌桓(huan)亦各自为政(zheng),或从汉攻(gong)匈奴,或从(cong)匈奴联(lian)兵攻汉(han)。汉还频频利用乌(wu)桓骑兵镇(zhen)压(ya)各地义军。
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