separated into ten parts. We attack the divided ten with the united one. We are many, the enemy is few, and in superiority of numbers there is economy of strength.
The place selected for attack must be kept secret. If the enemy know not where he will be attacked, he must prepare in every quarter, and so be everywhere weak.
If the enemy strengthen his front, he must weaken his rear; if he strengthen his right, his left is weakened; and if he strengthen his left, his right is weakened.
Everywhere to make preparations, is to be everywhere weak. The enemy is weakened by his extended preparations, and we gain in strength.
Having decided on the place and day of attack, though the enemy be a hundred leagues away, we can defeat him.
If the ground and occasion be not known, the front cannot help the rear; the left cannot support the right, nor the right the left, nor the rear the front. For on occasion, the parts of the army are two score
