《北史·列传·卷四十》
芒山大捷后，后主对长恭说： 深入敌阵太远，失利了恐怕后悔不及。 
芒山之捷，后主谓长恭曰： 入阵太深，失利悔无所及。 
After the great victory at Mang Mountain, the Empress said to Changgong: When you went deep inside the enemy lines, if you had suffered a setback, it would have been too late to regret.