Be subtle! be subtle! and use your spies for every kind of business.
The rising of birds in their flight is the sign of an ambuscade. Startled beasts indicate that a sudden attack is coming.
Opportunities multiply as they are seized.
Secret operations are essential in war; upon them the army relies to make its every move.
If the enemy has occupied them before you, do not follow him, but retreat and try to entice him away.
Move not unless you see an advantage; use not your troops unless there is something to be gained; fight not unless the position is critical.