《史记·三十世家·郑世家》
庄公派军攻打叔段，段逃跑公又攻打京城，京城的人们都背叛了叔段，叔段面对无奈逃跑到鄢。
庄公发兵伐段，段走。伐京，京人畔段，段出走鄢。
Duke Zhuang sent an army to attack Shu Duan, and Duan fled. Zhuang then attacked the capitol. With no other option, Shu Duan fled to Yan.