We shall be unable to turn natural advantage to account unle... ss. 7.14, Chapter 7: Maneuvering

We cannot enter into alliance with neighboring princes until... ss. 11.52, Chapter 11: The Nine Situations

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

Having LOCAL SPIES means employing the services of the inhab... ss. 13.9, 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