Cao Cao (played by Bao Guoan) received letters from Cai Zhong (played by Li Xiaozhou) and Cai He (played by Li Hua), and decided to find out the truth in case of fraud. Jiang Gan (played by Zhou Zhou) pleaded for his life, wanting to take the crime and make meritorious service. Zhou Yu (played by Hong Yuyu) and Lu Su (played by Cao Li) negotiated to break Cao Liang's strategy. It was necessary for Pang Tong's series of plans, but there was no chance. It happened that Jiang Gan came, Zhou Yu was overjoyed, and Jiang Gan was locked up by Zhou Yu in Xishan Nunnery. Jiang Gan met Pang Tong (played by Zhu Shibin) in the nunnery. Pang Tong wanted to join Cao Cao, and Jiang Gan recommended him. The two left Soochow, and Pang Tong came to Caozhai to watch Cao Cao's naval drills. Pang Tong suggested to Cao Cao to connect Cao's warships with iron locks, so that soldiers walking on the deck would be as stable as on flat ground, which could solve the problem that northern soldiers were not used to water warfare. Xu Shu (played by Zhai Wanchen) saw through Pang Tong's conspiracy, but did not tell anyone else. Cao Cao listened to Pang's strategy and ordered people to chain the warships together with iron chains.