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.

Hold out baits to entice the enemy. Feign disorder,
and crush him.

If he is taking his ease, give him no rest.
If his forces are united, separate them.

Attack him where he is unprepared, appear where
you are not expected.

-Sun Tzu-