In 208 AD, Cao Cao's army approached Jiangling and planned to attack Sun Quan. Cao Cao challenged Sun Quan and said, "I dedicated myself to punishing guilty ministers. Now that Liu Cong has surrendered, Liu Bei has also been defeated and fled. I'm pushing 80 Wan Shuijun, ready to fight the general. If you drop me, you can avoid the disaster of blood. "
In this emergency, Sun Quan called ministers to discuss countermeasures. Some people advocated the surrender of Cao Cao, while others advocated the resistance to Cao Cao, which made Sun Quan temporarily lose his mind. At this time, Zhuge Liang came to argue with Confucianism, and the comprehensive analysis of the situation by Lu Su and Zhou Yu made Sun Quan finally make up his mind to defeat Wu Dongzhi's soldiers against Cao Cao. Sun solemnly said to everyone, "I swear to be at odds with Cao Cao, an old thief, and Soochow will fight Cao Cao to the end." Then, he pulled out his knife and chopped off a corner of the handsome case at once, raising his voice and saying, "From now on, whoever surrenders to Cao Cao will end up in this handsome case!" Those who advocated surrendering to Cao were silent when they saw this.
The purpose of Sun Quan's case is to warn those who advocate surrendering to Cao Cao. This shocking practice has forcibly suppressed different opinions and played a positive role in effectively unifying internal understanding.
The basic explanation refers to cursing mulberry trees and locust trees. On the surface, it is cursing this person, but in fact it is cursing that person.