公安县
After Liu Bei's conquest of Yi Province, Sun Quan sent Lu Su as an emissary to demand the return of the commanderies in southern Jing Province, but Liu Bei refused and told him to wait until he took Liang province. Sun Quan was furious then sent Lü Meng and Ling Tong to lead 20,000 men to attack southern Jing Province and they succeeded in capturing Changsha, Guiyang and Lingling commanderies. In the meantime, Lu Su and Gan Ning advanced to Yiyang County with 10,000 men to block Guan Yu) and took over command of the army at Lukou. Liu Bei personally went to Gong'an County with 50 000 soldiers while Guan Yu led 30,000 men to Yiyang County. When war was about to break out, Liu Bei received news that Cao Cao was planning to attack Hanzhong Commandery after Zhang Lu fled to Baxi.