Should the enemy forestall you in occupying a pass, do not go after him if the pass is fully garrisoned, but only if it is weakly garrisoned.
Sun TzuSo there are five ways of knowing who will win. Those who know when to fight and when not to fight are victorious. Those who discern when to use many or few troops are victorious. Those whose upper and lower ranks have the same desire are victorious.
Sun TzuIf those who are sent to draw water begin by drinking themselves, the army is suffering from thirst.
Sun Tzu