This book tells a story based on historical facts and fiction. The outline of the story is as follows. In the late Three Kingdoms period, the Shu and Han Dynasties unified the country, but the emerging Tang Dynasty occupied the land of Qin, Jin, and Henan and established its capital in Chang'an. Guan Yu led his army from Shu to attack Bingzhou by detouring from Jizhou, and wanted to invade Chang'an from east to west. However, the two sides faced off in Bingzhou and divided the banks of the Fen River to govern. The two sides adopted completely opposite strategies for governing the country, which resulted in a series of conflicts. The story told in this book is divided into two parts. The first part is the appearance of the protagonist and the military battle, and the second part is the story that happened under different national policies.