When the leader is morally weak and his discipline not strict, when his instructions and guidance are not enlightened, when there are no consistent rules, neighboring rulers will take advantage of this.
Sun TzuIf I am able to determine the enemy's dispositions while at the same time I conceal my own, then I can concentrate and he must divide.
Sun TzuShould 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 Tzu