《资治通鉴·魏纪·魏纪九》
我们只坚守三面，如果吴兵从陆地而来，军粮必少，我们就用游动的轻骑兵断绝他们的运粮道路，这样可以不战而打败敌人。
但坚守三面，若吴贼陆道而来，军粮必少；吾以游兵轻骑绝其转输，可不战而破也。
We only need to hold three sides. If Wu soldiers come from the land, they will have little food, we can use the mobile light cavalry to cut off their food supply line, in this way, we can defeat the enemy without fighting.