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Next part   XI. The Nine Situations  
	
		
			| Sun Tzu said: | Commentary |  
			| 15. Those who were called skillful leaders of old knew how to drive a wedge 
between the enemy's front and rear; to prevent co-operation between his large 
and small divisions; to hinder the good troops from rescuing the bad, the 
officers from rallying their men. | The
			wedge is a classic tactic for 
			breaking a defensive line. Like a nail penetrating a hard wood, a 
			focused force can break through a strong defense. In physics, 
			pressure is measured as force per unit area. This means a small 
			force at a single point can still cause tremendous pressure. In war 
			it is sometimes called 'divide and conquer'. A wedge from the side 
			isolates the front-line troops from the rearguard, making each more 
			vulnerable.  The wedge can also be used in business, for example in breaking 
			up competitive alliances.  |  
			| 16. When the enemy's men were united, they managed to keep them in disorder. | Unity and order are 
			closely related. Hence if you divide their forces they will be 
			inclined to disorder. One reason for this is that you may well be 
			able to separate men from their commanders. Thus isolated, they will 
			become like headless chickens. |  
			| 17. When it was to their advantage, they made a forward move; when otherwise, 
they stopped still. | War is not just about 
			advancing. It is about being in the place of greatest potential and 
			advantage. This principle can result in movement in any direction, including 
			going backwards or remaining still. |  
			| 18. If asked how to cope with a great host of the enemy in orderly array and 
on the point of marching to the attack, I should say: "Begin by seizing 
something which your opponent holds dear; then he will be amenable to your 
will." | Something that is 
			'held dear' implies an emotional attachment. When a person is 
			attached to something, they make it a part of their
			identity. 
			their self. Taking the attached thing is like stealing a part of 
			their self. It feels like the basest abuse and creates anger, fear, 
			loss and other strong emotions. In war this may be a beautiful 
			city, a famed person, critical armaments and more. Greater than the sense of temporary loss is the fear that the 
			taken item will be destroyed, leading to permanent loss and hence 
			extinction of a part of the person. This threat can wean away any 
			anger and lead to fearful compliance.  |  
			| 19. Rapidity is the essence of war: take advantage of the enemy's 
unreadiness, make your way by unexpected routes, and attack unguarded spots. | War is a game of 
			positioning. Where you are at any time is critical. In between, as 
			you travel to these places, you are vulnerable. Speed hence reduces 
			the chance of dangerous attack. Getting to strong positions 
			earlier than the enemy expects also gives you the advantage of 
			surprise and hence letting you attack them where they are weak. Speed also lets you travel in circuitous routes to avoid 
			detection and yet arrive in time. Finally, speed gives you kinetic energy, which in physics is 
			measured as half of the mass times the speed squared. An 
			attack at speed hence is very powerful. |      |