On the seventh day of April, Ying Zheng personally led 33,000 Guanning cavalry and 5,000 new troops, carrying red cannons, blunderbuss and other firearms from Beijing. Wearing custom-made Qin-style black armor, he showed a decisiveness and heroic spirit that far surpassed that of Chongzhen. After marching to Jizhou, Ying Zheng closely inspected the preparation of firearms and communicated with Zhu Youjian who was in the Qin Dynasty through the imperial seal. He learned that Da Qin had made matchlock guns and experimented with growing potatoes. Facing Zhu Youjian's concerns about the war situation, Ying Zheng, who had swept the six countries, was full of confidence. Four days later, the army arrived at Shanhaiguan. Ying Zheng held his sword and looked into the distance, preparing for a life-or-death showdown with Dorgon's 80,000 enemy troops.