Cao Cao sent Jiang Gan to Wu Dong to find out about Huang Gai's surrender. Zhou Yu deliberately arranged for him to meet Pang Tong. Pang Tong pretended to surrender to Cao Cao and then went to Cao Ying to gain Cao Cao's trust. Pang Tong taught Cao Cao's water army the "magic" of nailing ships in series (so that Wu Dongjun could burn forever ~).

This chain is different from the "chain plan" of the 36 plan, which means nailing the ship chain.