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简介：Liang Yizhang took out an official letter he had just received and handed it to Ma Jinzhong, but it was from Zhu Zhifeng, governor of Xuanhua - it was difficult for the Jianlu to break through the Miyun Great Wall, and they were likely to turn to the Xuanfu Great Wall, so the troops stationed everywhere must be careful. It was not issued specifically to Zhangjiakou, but to all generals in the Xuanfu.