匈(xiong)奴(nu)分裂为南北两(liang)部之后(hou),乌桓族(zu)各部趁机脱离了(le)匈奴的统治,汉武帝击败匈奴后,迁(qian)乌(wu)桓于止(zhi)谷、渔阳、右北(bei)平、辽东、辽西五郡边(bian)塞(sai),始置(zhi)护(hu)乌(wu)桓(huan)校尉,持节监护乌桓(huan)各部不得与匈奴通(tong)。汉与南(nan)匈奴对(dui)抗时(shi),各(ge)部乌桓亦各自为政(zheng),或(huo)从(cong)汉攻匈奴(nu),或从匈(xiong)奴联兵攻汉。汉(han)还频频利用(yong)乌桓(huan)骑兵镇(zhen)压(ya)各地义军。
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