《宋史·列传·卷二十四》
只要敌人出动，我方归守，敌人东备我方则击其西，使他们奔走不暇，怎能成为我方祸患呢？
但彼出则我归，东备则西击，使之奔走不暇，何能为我患哉？
As long as the enemy goes out to war, we return to defend; if the enemy prepares in the east we will attack in the west, and if the enemy prepares in the west we will attack in the east. We will harass them so that they will have no time to rest. How can they become a threat to us？