《宋史·列传·卷二百零二》
作为主帅，应该是知理而后可以举兵，知势而后可以加兵，知节而后可以用兵。
凡主将之道，知理而后可以举兵，知势而后可以加兵，知节而后可以用兵。
As a commander-in-chief, he should know the principles of military operations and then mobilize the troops, know the situation and then increase the troops, and know the method of controlling the war and then use the troops.