13.25

Chapter: The Use of Spies 13.25
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Translation:

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.

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Commentary

Knowledge of the enemy, such as their plans, numbers, morale and so on may be guessed from distant observation. The certainty that a converted spy brings allows far more direct action and can end the war more quickly.

To give up such information, it is far better to motivate the spy with reward than punishment. Interrogation leads to people telling you what they think you want to know. Proper motivation leads them to really want to help you.