Go into emptiness, strike voids, bypass what he defends hit him where he does not expect you.
Weak leadership can wreck the soundest strategy
Without subtle ingenuity of mind, one cannot make certain of the truth of their reports.
The military has no constant form, just as water has no constant shape - adapt as you face the enemy, without letting them know beforehand what you are going to do.
Weigh the situation, then move.
The ultimate in disposing one's troops is to be without ascertainable shape. Then the most penetrating spies cannot pry in nor can the wise lay plans against you.