When these five kinds of spy are all at work, none can disco... ss. 13.8, Chapter 13: The Use of Spies

If a secret piece of news is divulged by a spy before the ti... ss. 13.19, Chapter 13: The Use of Spies

The enemy's spies who have come to spy on us must be sought ... ss. 13.21, Chapter 13: The Use of Spies

It is through the information brought by the converted spy t... ss. 13.22, Chapter 13: The Use of Spies

It is owing to his information, again, that we can cause the... ss. 13.23, Chapter 13: The Use of Spies

Lastly, it is by his information that the surviving spy can ... ss. 13.24, Chapter 13: The Use of Spies

The end and aim of spying in all its five varieties is knowl... ss. 13.25, Chapter 13: The Use of Spies

Hence it is essential that the converted spy be treated with... ss. 13.25, Chapter 13: The Use of Spies