Hence the use of spies, of whom there are five classes: (1) ... ss. 13.7, Chapter 13: The Use of Spies

Having CONVERTED SPIES, getting hold of the enemy's spies an... ss. 13.11, 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

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