The Principles of Combating an Invasion

Take advantage of the enemy's unreadiness. Make your way by unexpected roots and attack unguarded spots. The further you penetrate into a country, the greater will be the solidarity of your troops. Keep your army continually on the move and devise unfathomable plans. Prohibit the taking of almonds and do away with superstitious doubts. Then, until death itself comes, no calamity need be feared.