Against those skilled in attack, an enemy does not know where to defend; against the experts in defense, the enemy does not know where to attack.

Be where your enemy is not.

Do not swallow bait offered by the enemy. Do not interfere with an army that is returning home.

Invincibility lies in the defense; the possibility of victory in the attack.

And regulation entails organizational effectiveness, a chain of command, and a structure for logistical support.

Ground which can be abandoned but is hard to re-occupy is called entangling.

Rapidity is the essence of war.