Wait by the river long enough and the body of your enemy will float by you.
There is no place where espionage is not possible.
No ruler should put troops into the field merely to gratify his own spleen; no general should fight a battle simply out of pique.
Management of many is the same as management of few. It is a matter of organization.
Without harmony in the State, no military expedition can be undertaken; without harmony in the army, no battle array can be formed.
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.