The Art of War, Chapter 13 summary
Chapter 13 of 13 · 15 min to read the chapter
In Chapter 13, Sun Tzŭ argues that the human and financial costs of war make spending on intelligence essential, then explains five kinds of spies and their management. He gives converted enemy spies a central role because their information helps commanders recruit other agents, spread false reports, and choose when to gather news.
What happens
- Sun Tzŭ contrasts the enormous costs of warfare with the smaller payments needed to learn the enemy’s condition.
- He argues that knowledge of enemy plans comes from people, not spirits, comparisons, or calculations.
- He distinguishes local, inward, converted, doomed, and surviving spies by their sources and tasks.
- He requires generous rewards, secrecy, kindness, and careful judgment, while prescribing death for premature disclosure.
- He explains how converted spies support the recruitment and use of every other kind.
- He cites I Chih and Lü Ya before concluding that intelligent agents are essential to military movement.
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In this chapter
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Which kind of spy supplies information that helps commanders use the other kinds?
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