简介:As for the surprise attack by the Mongolian cavalry in Khalkha, Zhang Guowei, the governor of Xuanda, gave full authority to the commander-in-chief of Daning, Li Dingguo. He led the cavalry of his headquarters, together with Zhangjiakou's three troops outside the Great Wall and Ha Cishen's right-wing cavalry, to use guerrilla tactics and break into Yizhou. The 30,000 Khalkha Mongolian cavalry on the border repeatedly pulled