《魏书·列传·卷二十三》
纵然能来，待对方疲惫，秋季凉爽战马肥壮，乘敌军取办粮食，从容地去攻击他，是万全之计，定能取胜。
就使能来，待其劳倦，秋凉马肥，因敌取食，徐往击之，万全之计，胜必可克。
Even if we were to attack, we should wait until the other side is exhausted and the autumn is cool and the horses are in good condition. When the enemy army goes out to acquire food, we will attack them calmly. This is a foolproof plan and we will definitely be victorious.