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<- The Art of War

XIII. The Use of Spies

1. Sun Tzu said: Raising a host of a hundred thousand men and marching

them great distances entails heavy loss on the people and a drain

on the resources of the State. The daily expenditure will amount to

a thousand ounces of silver. There will be commotion at home and abroad,

and men will drop down exhausted on the highways. As many as seven

hundred thousand families will be impeded in their labor.

2. Hostile armies may face each other for years, striving for the

victory which is decided in a single day. This being so, to remain

in ignorance of the enemy's condition simply because one grudges the

outlay of a hundred ounces of silver in honors and emoluments, is

the height of inhumanity.

3. One who acts thus is no leader of men, no present help to his sovereign,

no master of victory.

4. Thus, what enables the wise sovereign and the good general to strike

and conquer, and achieve things beyond the reach of ordinary men,

is foreknowledge.

5. Now this foreknowledge cannot be elicited from spirits; it cannot

be obtained inductively from experience, nor by any deductive calculation.

6. Knowledge of the enemy's dispositions can only be obtained from

other men.

7. Hence the use of spies, of whom there are five classes: (1) Local

spies; (2) inward spies; (3) converted spies; (4) doomed spies; (5)

surviving spies.

8. When these five kinds of spy are all at work, none can discover

the secret system. This is called "divine manipulation of the threads."

It is the sovereign's most precious faculty.

9. Having local spies means employing the services of the inhabitants

of a district.

10. Having inward spies, making use of officials of the enemy.

11. Having converted spies, getting hold of the enemy's spies and

using them for our own purposes.

12. Having doomed spies, doing certain things openly for purposes

of deception, and allowing our spies to know of them and report them

to the enemy.

13. Surviving spies, finally, are those who bring back news from the

enemy's camp.

14. Hence it is that which none in the whole army are more intimate

relations to be maintained than with spies. None should be more liberally

rewarded. In no other business should greater secrecy be preserved.

15. Spies cannot be usefully employed without a certain intuitive

sagacity.

16. They cannot be properly managed without benevolence and straightforwardness.

17. Without subtle ingenuity of mind, one cannot make certain of the

truth of their reports.

18. Be subtle! be subtle! and use your spies for every kind of business.

19. If a secret piece of news is divulged by a spy before the time

is ripe, he must be put to death together with the man to whom the

secret was told.

20. Whether the object be to crush an army, to storm a city, or to

assassinate an individual, it is always necessary to begin by finding

out the names of the attendants, the aides-de-camp, and door-keepers

and sentries of the general in command. Our spies must be commissioned

to ascertain these.

21. The enemy's spies who have come to spy on us must be sought out,

tempted with bribes, led away and comfortably housed. Thus they will

become converted spies and available for our service.

22. It is through the information brought by the converted spy that

we are able to acquire and employ local and inward spies.

23. It is owing to his information, again, that we can cause the doomed

spy to carry false tidings to the enemy.

24. Lastly, it is by his information that the surviving spy can be

used on appointed occasions.

25. The end and aim of spying in all its five varieties is knowledge

of the enemy; and this knowledge can only be derived, in the first

instance, from the converted spy. Hence it is essential that the converted

spy be treated with the utmost liberality.

26. Of old, the rise of the Yin dynasty was due to I Chih who had

served under the Hsia. Likewise, the rise of the Chou dynasty was

due to Lu Ya who had served under the Yin.

27. Hence it is only the enlightened ruler and the wise general who

will use the highest intelligence of the army for purposes of spying

and thereby they achieve great results. Spies are a most important

element in water, because on them depends an army's ability to move.

THE END