保安軍！
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橫嶺城，古稱橫嶺口，位于河北懷來縣境內，在明代即是一處重要的長城關口。1449年八月，發生了著名的“土木堡之變”，明英宗北征蒙古的途中，竟然在延慶以西的懷來土木堡被瓦剌首領也先活捉，數十萬大軍潰散死傷。隨後，瓦剌人大舉進攻北京城。在居庸關沒有被攻破的情況下，一部分游騎分別從居庸關以西的白羊口和橫封秘察情顯
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