If the enemy is in the habit of using spies, send your own to deceive them.
The Art of War
The Art of War, Chapter 13: The Use of Spies
c. 5th Century BC
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Cross Reference
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"Build your opponent a golden bridge to retreat across."
Humorous"The line between disorder and order lies in logistics."
Controversial"The general who understands the principles of the art of war is the minister of the people's fate and the guardian of the nation's security."
Strange & Unusual"Therefore, the skillful leader subdues the enemy's troops without any fighting; he captures their cities without laying siege to them; he overthrows their kingdom without long years of campaigning."
Shocking"The general who is skilled in defense hides in the most secret recesses of the earth; he who is skilled in attack flashes forth from the topmost heights of heaven."
Humorous