How did Zhu Rong surrender in the Three Kingdoms Period 4?

This is an invitation to other forces to use diplomatic options to ask foreign countries to invade your city. You can choose to attack or not to attack. If you don't attack the city, you will suffer, and fewer soldiers will attack. If you attack, you have a certain chance to capture the foreign generals alive. In his later years, there were many military commanders, such as Meng Huo, Mrs. Zhu Rong and A Huinan.