Of all rewards none [is] more liberal than those given to secret agents.

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

To ... not prepare is the greatest of crimes; to be prepared beforehand for any contingency is the greatest of virtues.

If your enemy is superior, evade him

The spot where we intend to fight must not be made known; for then the enemy will have to prepare against a possible attack at several different points; and his forces being thus distributed in many directions, the numbers we shall have to face at any given point will be proportionately few.

Other conditions being equal, if one force is hurled against another ten times its size, the result will be the flight of the former.

It is a doctrine of war not to assume the enemy will not come, but rather to rely on one's readiness to meet him; not to presume that he will not attack, but rather to make one's self invincible.