Who is Dong Guo, the first peak of the 13th rush in Water Margin?

Deep-water bomb Suochao. Yang Zhi killed Niu Er, a rogue, and took him to see an official. Liang Zhongshu attached great importance to his loyalty and talent, preserved and listened to his opinions in the government, and intended to let him find a job in the army. In order to avoid what people say, he advertised for an open job. First of all, Zhou Jin, the deputy army, competed with Yang Zhi. The first game was shooting. In order to avoid hurting people, Yang Zhi wrapped the spear in white cloth and then plastered it with lime. As a result, after 30 rounds, Yang Zhi had only one shoulder. The first arrow Yang Zhi dodged sideways, the second arrow was blocked by a bow, and the third arrow was followed by a hand. It was Yang Zhi's turn. The first arrow drew an empty string, and the second arrow easily landed on Zhou Jin's left shoulder ... Zhou Jin's master Suochao was unconvinced by this, and the evidence was conclusive. As a result, they struggled for 50 rounds ... Liang Zhongshu was overjoyed and both of them were promoted to ambassador to Guan Jun. Then he celebrated and got drunk, Liang Zhongshu. People replied: I have never seen two brave soldiers compete. At present, Liang Zhongshu is overjoyed and thinks that it is right to use Yang Zhi.