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Page 86
Make an Estimate of the Situation
Sun Tzu continues:
When the enemy is close at hand and remains quiet, he is relying on a favorable position. When he challenges battle from afar, he wishes to lure you to advance; when he is on easy ground, he must be in an advantageous position. When the trees are seen to move, it means the enemy is advancing; when many screens have been placed in the undergrowth, it is for the purpose of deception. The rising of birds in their flight is the sign of an ambuscade. Startled beasts indicate that a sudden attack is forthcoming.
Dust spurting upwards in high straight columns indicates the approach of chariots. When it hangs low and is widespread, it betokens that infantry is approaching. When it branches out in different directions, it shows that parties have been sent out to collect firewood. A few clouds of dust moving to and fro signify that the army is camping.
When the enemy's envoys speak in humble terms, but the army continues preparations, that means it will advance. When their language is strong and the enemy pretentiously drives forward, these may be signs that he will retreat. When light chariots first go out and take positions on the wings, it is a sign that the enemy is forming for battle. When the enemy is not in dire straits but asks for a truce, he must be plotting. When his troops march speedily and parade in formations, he is expecting to fight a decisive battle on a fixed date. When half his force advances and half retreats, he is attempting to decoy you.
When his troops lean on their weapons, they are famished. When drawers of water drink before carrying it to camp, his troops are suffering from thirst. When the enemy sees an advantage but does not advance to seize it, he is fatigued.
When birds gather above his camp sites, they are unoccupied. When at night the enemy's camp is clamorous, it betokens nervousness. If there is disturbance in the camp, the general's authority is weak.

 
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