After saving Song Jiang and Dai Zong in Jiangzhou (江州; east of present-day Chongzuo, Guangxi), the outlaws from Liangshan Marsh are making their way back to base when they passed by Mount Yellow Gate along the way.
After Huyan Zhuo surrenders and joins the Liangshan band, Ou Peng and nine others follow Huyan Zhuo to Qingzhou (青州; in present-day Shandong) to trick Murong Yanda, Qingzhou's governor, into opening the city gates.