夷陵之战
In 219 Guan Yu was killed by Eastern Wu and Cao Wei coalition in the Battle of Fancheng. Guan Suo and Bao Sanniang fled to the territory of the Bao family. To avenge the death of Guan Yu, Liu Bei marched with his troops against Sun Quan at the Battle of Xiaoting. Liu Bei suffered a humiliating defeat and died months later in disgrace.