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Art of War Chapter 3 Summary: Attack by Stratagem

What Chapter 3 actually argues

The chapter opens with a preference for capturing things intact. It is better to take a country whole than to shatter it, better to capture an army entire than destroy it, and the same holds down the scale to a single company. This is not sentiment. A destroyed prize is worth less than an acquired one, and destruction costs more to achieve.

That premise produces the ranking. To fight and conquer in all your battles is not supreme excellence; supreme excellence is breaking the opponent's resistance without fighting at all. The highest generalship is to baulk the enemy's plans; next best is to prevent the junction of his forces; next is to attack his army in the field; and the worst policy of all is to besiege walled cities, which Sun Tzu says should be avoided if it can possibly be avoided. He then gives the reason in a memorable image: the general who cannot control his irritation launches his men at the walls like swarming ants, loses a third of them, and the town remains untaken.

Next come the force ratios — surround at ten to one, attack at five to one, divide the army at two to one, offer battle when equally matched, avoid the enemy when clearly inferior. The instruction that follows matters more than the numbers: however obstinate a small force is, in the end it will be captured by the larger one. Sun Tzu is telling you to check the ratio before engaging, not to find courage after you have.

The chapter then turns unexpectedly to the ruler, listing three ways a sovereign brings misfortune on his own army: ordering advances or retreats it cannot execute, governing an army as if it were a kingdom, and appointing officers without discrimination. This is a chapter about attack that pauses to say most armies are damaged from behind. It closes with five essentials for victory — knowing when to fight and when not to, handling both superior and inferior forces, unity of spirit through all ranks, preparedness against an unprepared enemy, and a capable general whom the sovereign does not interfere with — and then with the line everyone knows.

Key lines from the Giles translation

These are quoted verbatim from Lionel Giles’ 1910 translation, which is in the public domain:

Hence to fight and conquer in all your battles is not supreme excellence; supreme excellence consists in breaking the enemy’s resistance without fighting.

Thus the highest form of generalship is to baulk the enemy’s plans.

If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat.

One modern application: refuse the siege

The most transferable instruction in Chapter 3 is the one about walled cities. A siege is any contest where the other side is entrenched, well supplied, defending on ground they chose, and can simply wait. Attacking the largest incumbent on the dimension they have spent a decade fortifying is a siege. So is arguing someone out of a position they have publicly committed to. So is a hiring process where you are the fourth candidate for a role already promised internally. Sun Tzu's advice is not to fight harder in these situations. It is to notice you are in one and decline.

The complement is the ranking above it: baulk the plan, or prevent the junction of forces. In ordinary terms, address the situation earlier, when it is still a decision rather than a fortification. And read the closing line as the diagnostic it is. Sun Tzu names three states, not two — knowing both, knowing only yourself, and knowing neither. Most people who lose badly do not lack information about their opponent. They have an inaccurate picture of their own strength, which is the half of the equation they never thought to verify.

Where Chapter 3 sits in the 13 chapters

The 13 chapters are a single argument, not thirteen essays: Chapters 1 to 6 establish assessment, cost, the ranking of methods, security, force and concentration; Chapters 7 to 12 apply them to movement, adaptation, observation, ground and restraint; Chapter 13 supplies the information all of it depends on. For the whole arc in one place, read The Art of War explained, or take the printable 13-chapter summary with you. Background on the text, its dating and its translation history is available at Wikipedia.

Read Chapter 3 as a lesson, not a page

LearnTzu turns each of the 13 chapters into short daily lessons with a journal prompt that applies the idea to a decision you are actually facing — which is the difference between having read Sun Tzu and being able to use him.

Frequently asked questions

What is Chapter 3 of The Art of War about?

Chapter 3, Attack by Stratagem, ranks the forms of attack. The best is to break the opponent resistance without fighting, then to baulk his plans, then to prevent his forces joining, then to attack his army, and worst of all to besiege walled cities. It ends with the five essentials for victory and the line about knowing the enemy and yourself.

What does supreme excellence consists in breaking the enemy resistance without fighting mean?

It means the highest form of victory costs nothing to win and leaves the prize intact. Sun Tzu prefers outcomes achieved by position, preparation and pressure over outcomes achieved by battle, because fighting destroys part of what you were trying to take.

What are the force ratios in Art of War Chapter 3?

Surround the enemy at ten to one, attack at five to one, divide your army at two to one, offer battle when evenly matched, and avoid the enemy when you are clearly inferior. Sun Tzu adds that an obstinate small force will still be captured in the end by the larger one.

Which chapter has if you know the enemy and know yourself?

Chapter 3, Attack by Stratagem, verse 18. A related line appears at the end of Chapter 10, Terrain, which extends it: if you know Heaven and know Earth as well, you may make your victory complete.