四个数复式三中三多少组简介:In this way, the Great Wall defense line in the north of the Ming Dynasty was exposed to the Mongols. They could drive straight down at any time and harass the Ming Dynasty. This was also a fundamental reason for the later Tumubao Incident and even the demise of the Ming Dynasty.
In this way, the Great Wall defense line in the north of the Ming Dynasty was exposed to the Mongols. They could drive straight down at any time and harass the Ming Dynasty. This was also a fundamental reason for the later Tumubao Incident and even the demise of the Ming Dynasty.