《吴子·应变》
如果在高山深谷突然与敌遭遇，必先击鼓呐喊，乘势冲乱敌人，再把弓弩手挺进到前面，一面戒备，一面考虑计谋，并观察敌人的阵势是否混乱，如发现敌军混乱，就毫不迟疑地全力发起进攻。 
若高山深谷，卒然相遇，必先鼓噪而乘之，进弓与弩，且射且虏。审察其政，乱则击之无疑。 
If, in a mountainous valley, we suddenly encounter an enemy, we must first sound the drums and shout, take advantage of the momentum to disrupt the enemy, then advance the crossbowmen to the front, on the one hand being vigilant and on the other hand considering strategies, and observe whether the enemy’s formation is in chaos. If the enemy is in chaos, we should not hesitate and launch a full-scale attack.