The Cao Song Disaster, the Xu Province Catastrophe
Cao Cao’s father Cao Song moved his household south to take refuge with Tao Qian, and on the way was killed for his wealth by Tao Qian’s officer Zhang Kai. On the news, Cao Cao, grief-stricken and enraged, raised an army to avenge his father, massacring cities as he went, and the people of Xu province died in droves. This disaster, sprung from an officer’s greed, nearly destroyed the base Tao Qian had run for half a lifetime.
Thrice Yielding Xu Province
Amid Cao Cao’s onslaught, Tao Qian sought Liu Bei’s aid, and Liu Bei broke the siege. Feeling himself old and frail and his sons unworthy, Tao Qian several times asked Liu Bei to take over Xu province, and Liu Bei refused again and again. On his deathbed Tao Qian charged his officers to be sure to invite Liu Bei to rule, and at last Liu Bei took Xu province — "thrice yielding Xu province" thus became a rare model of the peaceful transfer of power in a chaotic age.