Factors in the art of warfare are: First, calculations; second, quantities; third, logistics; fourth, the balance of power; and fifth, the possibility of victory is based on the balance of power.

When he utilizes combined energy, his fighting men become as it were like unto rolling logs or stones. For it is the nature of a log or stone to remain motionless on level ground, and to move when on a slope; if four-cornered, to come to a standstill, but if round-shaped to go rolling down.

One who has few must prepare against the enemy; one who has many makes the enemy prepare against him.

Appear at points which the enemy must hasten to defend; march swiftly to places where you are not expected.

The sovereign must have full knowledge of the activities of the five sorts of agents. This knowledge must come from the double agents, and therefore it is mandatory that they be treated with the utmost liberality.

Therefore the good fighter will be terrible in his onset, and prompt in his decision.

Go into emptiness, strike voids, bypass what he defends hit him where he does not expect you.