《尉缭子·武议》
指导战争，要做到上不受天时的影响，下不受地形的限制，后面不受君主的制约，前不受敌人的阻抗。
无天于上，无地于下，无主于后，无敌于前。
In directing battles, you must be unaffected by the influence of the sky above, not restricted by the terrain below, unrestrained by the sovereign behind and unhampered by the enemy ahead.