What is the main content of Chapter 15 of Water Margin?

The fifteenth time, Wu pedant said that three Ruan bumped into Gongsun Sheng, and the seven stars should gather righteousness.

Wu Yong introduced SanRuan to the Party leader and Liu Tang, set out overnight and traveled a hundred miles to Shi Jiecun, not far from the water margin. Ruan's three brothers are dissatisfied with the government, but they envy the heroes in the Water Margin. Wu Yong took advantage of the trend and said that he would turn three. Six Xia made an oath in Huangjiazhuang; Gongsun Sheng insisted on seeing Classical, and told him what he knew about taking ill-gotten gains.

Seven stars get together and settle in Bai Sheng, a happy village in the east of Huangnigang. Liang Zhongshu asked Yang Zhi to give them the treasure, but Yang Zhi didn't make a big splash, but pretended to be a businessman. And always listen to him, and don't be awkward on the road. A group of fifteen people left Beijing and took the road to Tokyo. It was May and June. It was too hot to travel, and the army fell to the ground. The Seven Chivalrous Man dressed as a small broker selling dates, and Bai Sheng dressed as a liquor seller. Eight people poured all the soldiers with drugs, and the old people were in charge. Yang Zhi drank less and got up early, so he wanted to jump down the mountain and commit suicide.