If you know neither the enemy nor yourself, you will succumb in every battle
Thus the expert in battle moves the enemy, and is not moved by him.
Attack where he is unprepared; sally forth when he does not expect you.
Invincibility depends on one's self; the enemy's vulnerability on him.
We may distinguish six kinds of terrain, to wit: (1) Accessible ground; (2) entangling ground; (3) temporising ground; (4) narrow passes; (5) precipitous heights; (6) positions at a great distance from the enemy.
For them to perceive the advantage of defeating the enemy, they must also have their rewards.