At the end of the Eastern Han Dynasty, Cao Cao expanded and the people were displaced. The unknown warrior Liu Donghai rescued Liu Bei and the refugees in Yingchuan, used his cleverness to divert the pursuers, and followed them to Runan.
When he first arrived in Runan, Liu Donghai was questioned by Zhou Tai and other generals, but he gained a foothold with the strategy of comforting the refugees, uniting powerful forces, and training new soldiers. Faced with the invasion by Li Dian and Cao Ren, he set up an ambush to rob grain, used fireworks to induce rain, and saw through the fake surrender. He collaborated with Guan Yu and Zhang Fei to strengthen the city defense and set up ambushes, and finally captured Cao Ren and stabilized Runan.
The book not only displays fierce battle scenes in which crossbows heat oil and gunpowder destroys chariots, but also the warmth of refugees and soldiers guarding their homes together. It interprets the truth of "the heart of the people is the city wall" through the growth of Liu Donghai and the benevolence of Liu Bei.
