宣府镇是明朝政府依托明长城建立的军事防御区——九镇之一。

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皇明九边考宣府镇

明初,明政府为抵御北方蒙古诸部的南下劫掠,建筑明长城。形成辽东蓟州、宣府等九个防区。宣府镇与其它军镇相同,负责本地区内长城、烽火墩台、各级屯兵城的防御工作[1]

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