《后汉书·列传·王刘张李彭卢列传》
光武急攻，二十余日，王郎少傅李立做了反间，打开城门迎接汉兵，于是攻拔邯郸。
因急攻之，二十余日，郎少傅李立为反间，开门内汉兵，遂拔邯郸。
Guangwu quickly attacked, and over twenty days later, Wang Lang's junior tutor Li Li turned traitor and opened the city gate to welcome the Han army, which was how Handan was taken.