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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.

[Cromwell, one of the greatest and most practical of all cavalry

leaders, had officers styled 'scout masters,' whose business it

was to collect all possible information regarding the enemy,

through scouts and spies, etc., and much of his success in war

was traceable to the previous knowledge of the enemy's moves thus

gained." [1] ]

9. Having local spies means employing the services of the

inhabitants of a district.

[Tu Mu says: "In the enemy's country, win people over by kind

treatment, and use them as spies."]

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