" It is the business of a general to be serene and inscrutable, impartial and self-controlled. If serene he is not vexed; if inscrutable, unfathomable; if upright, not improper; if self-controlled, not confused.

He should be capable of keeping his officers and men in ignorance of his plans. His troops may join him in rejoicing at the accomplishment, but they cannot join him in laying the plans. He prohibits superstitious practices and so rids the army of doubts. Then until the moment of death there can be no troubles. He changes his methods and alters his plans so that people have no knowledge of what he is doing. Courses of action previously followed and old plans previously executed must be altered.

He alters his campsites and marches by devious routes, and thus makes it impossible for others to anticipate his purpose. To assemble the army and throw it into a desperate position is the business of the general. He leads the army deep into hostile territory and there releases the trigger. He burns his boats and smashes his cooking pots; he urges the army on as if driving a flock of sheep, now in one direction, now in another, and none knows where he is going. He fixes a date for rendezvous and after the troops have met, cuts off their return route just as if he were removing a ladder from beneath them. "

― Sun Tzu , The Art of War