Guo Si
At the start of the war with the eastern warlords, Guo Si was sent to assist Niu Fu to improve the defences of Mei County. They built up fortifications and stored 30 years of food supply there before Dong Zhuo moved the capital to Chang'an from Luoyang. After Hu Zhen and Lü Bu suffered a major defeat at the hands of Sun Jian and Dong Zhuo's retreat to Chang'an, Niu Fu, Guo Si and Li Jue were ordered to station themselves in Shan (present-day Shaanxi), which was the battle front against the anti-Dong-Zhuo coalition. At the time the alliance was having internal conflicts and did not focus on fighting Guo Si and Li Jue, so the senior general Zhu Jun could only ask his old friend, Tao Qian to give him a hand in a futile effort to fight the forces of Dong Zhuo. Tao Qian, despite having a general alliance with Dong Zhuo, sent 3,000 elite Danyang troops to help Zhu Jun in his battle against Guo Si and Li Jue at Zhongmu County, where Zhu Jun was totally crushed. Guo Si, Li Jue and Zhang Ji then carried out raids in the Chenliu and Yingchuan commanderies, which Cao Cao was unable to stop and many residents there were captured and enslaved.