Therefore, just as water retains no constant shape, so in warfare there are no constant conditions.

As water shapes its flow in accordance with the ground, so an army manages its victory in accordance with the situation of the enemy.

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

And therefore those skilled in war bring the enemy to the field of battle and are not brought there by him.

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

Someone unfamiliar with the mountains and forests cannot advance [the team]. One who does not employ local guides cannot gain the advantage.

Do not engage an enemy more powerful than you. And if it is unavoidable and you do have to engage, then make sure you engage it on your terms, not on your enemy's terms.