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

A wise general makes a point of foraging of the enemy.

It is the business of a general to be quiet and thus ensure secrecy; upright and just, and thus maintain order.

Thus the skilful general conducts his army just as though he were leading a single man, willy-nilly, by the hand.

When the common soldiers are too strong and their officers too weak, the result is insubordination. When the officers are too strong and the common soldiers too weak, the result is collapse.

If there is disturbance in the camp, the general's authority is weak. If the banners and flags are shifted about, sedition is afoot. If the officers are angry, it means that the men are weary.

Know thy self, know thy enemy.