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In the autumn of 219, Liu Bei's general Guan Yu, who was in charge of Liu's territories in southern Jing Province, led an army north to attack Fan. Cao Cao sent the general Yu Jin to lead seven armies to resist Guan Yu, but the armies were destroyed in a flood when the Han River overflowed due to heavy rains. Yu Jin surrendered to Guan Yu while his subordinate Pang De refused and was executed by Guan. Cao Ren was left with a few thousand troops to defend Fan. Guan Yu and his forces sailed towards Fan on boats and besieged the fortress. By then, Cao Ren and his troops had been completely isolated inside Fan as they had lost contact with outside, while their supplies were running out and there were no reinforcements in sight. Cao Ren encouraged his men to fight to the death and they were very inspired by his words. By the time reinforcements led by Xu Huang arrived, the water level had subsided slightly. While Xu Huang was attacking Guan Yu, Cao Ren seized the opportunity to counterattack and break the siege. Guan Yu failed to conquer Fan so he retreated.