( 本期节目是会员专享,在播客中仅提供前10分钟试听。)
为了守卫北部边境,明王朝在东起鸭绿江西至嘉峪关的万里长城沿线设置了九个军事防区,统称九镇。“宣府镇”因为紧邻京畿且直面草原游牧民族成为九镇中最重要的一镇,著名的土木堡之变就发生在宣府镇的防区之内。
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