Its spelled Sun Tzu, but I believe this proverb applies:

All warfare is based on deception. Hence, when able to attack, we must seem unable; when using our forces, we must seem inactive; when we are near, we must make the enemy believe we are far away; when far away, we must make him believe we are near. [B]Hold out baits to entice the enemy. Feign disorder, and crush him.[B/]