Principle 2: Zuò Zhàn (作戰)
Executing War Operations
See the Cost 1st, Choose the Battle 2nd
Principle 2 teaches that every action carries a cost. Before you take a step, resources are already moving. Sun Zi reminds us that prolonged conflict weakens even the strongest. When you understand how effort is spent, you stop entering battles that drain you. When you recognize the true price of engagement, you protect your stability, your clarity, and your future.
This principle shows you how strength is preserved. It reveals why long struggles collapse discipline and why quick decisions conserve power. When you know what a battle will take from you, you choose differently. You stop fighting from habit. You begin fighting with purpose.
Your Inner Battlefield
Where hidden effort drains you before the outer world reacts.
- See where emotional conflict consumes resources you need elsewhere
- Recognize when pressure scatters your focus and weakens your discipline
- Understand how prolonged tension causes you to stall instead of act
- Anchor your choices in preservation rather than exhaustion
Your External Battlefield
Where environment and circumstances reshape your strength.
- Identify where conditions demand more effort than the outcome is worth
- See the people, systems, and pressures that either drain or reinforce your energy
- Recognize when complexity grows faster than your ability to respond
- Move toward resolution instead of prolonging conflict
Principle 2 teaches one of the most misunderstood truths of power, conflict, and human decision making: the danger is rarely the battle itself. The real danger is everything that happens before and after the battle. Sun Zi forces us to confront the weight of a choice that reshapes economies, societies, families, and the emotional reserves of the people who must carry the burden.
Sun Zi is not telling us how to fight more. He is teaching us how to avoid the slow destruction that comes from acting without preparation, without clarity, and without an understanding of how resources are spent. Victory belongs to the person who understands the real cost of their actions.
Before any conflict takes place, the state is already paying for it. Once conflict begins, the cost multiplies. If conflict lasts too long, even the intelligent and the skillful cannot save what collapses underneath them. Sun Zi warns that prolonged struggle wears down the strong, weakens the prepared, and drains the spirit of the people. A leader who does not understand this will mistake motion for progress and endurance for strength.
Key ideas from this principle:
- Every action requires resources, and resources are finite
- Prolonged conflict guarantees loss even if the battles appear successful
- Distance and supply chains exhaust people faster than enemies do
- Efficiency preserves strength better than force
- The wise leader strengthens themselves by using what the situation provides instead of draining their own reserves
Sun Zi also reminds us that a skilled strategist does not win by overwhelming effort. They win by transforming every victory into additional strength. Capturing what the enemy leaves behind, integrating their resources, and rewarding the people who bring these gains forward turns conflict into momentum instead of depletion.
Victory, in Sun Zi’s view, is not the destruction of the enemy. It is the preservation of the state. It is the ability to act without collapsing under the weight of your own decisions. A leader who understands Principle 2 seeks clarity, speed, and efficiency. They refuse to let struggle become a lifestyle.
The heart of Principle 2 is simple:
Winning slowly is the same as losing.
Winning efficiently is the only path that protects your people, your resources, and your future.
2.1 The Real Cost of War
Sun Zi begins by forcing the reader to understand something most leaders ignore: war is expensive before it even begins.
It drains resources long before a single soldier reaches the battlefield.
Key ideas:
- Raising an army requires massive spending for supplies, transportation, equipment, and logistics.
- The economic burden affects everyone: civilians, craftsmen, merchants, and the government.
- A nation must understand the true cost of maintaining an army, not just the cost of winning a battle.
Sun Zi’s warning is that war reshapes the entire state. The decision to fight cannot be made lightly.
2.2 The Dangers of Prolonged War
Here Sun Zi describes what truly destroys nations: not defeat, but duration.
When war drags on:
- supplies run dry
- soldiers weaken
- equipment deteriorates
- morale collapses
- the economy breaks
- enemies and opportunists rise up
Even wise generals and intelligent officials cannot fix the damage caused by long campaigns.
This section teaches that time itself becomes a threat. Prolonged war guarantees decline, even if the army continues to win small victories.
2.3 Why You Must Use the Enemy's Resources
A skilled general does not rely solely on supplies from his own people.
He avoids draining the state’s resources through long distance transportation.
Key insights:
- Distance weakens armies
- Supply chains exhaust populations
- The closer resources come from, the stronger the army becomes
- Using local or enemy supplies avoids unnecessary burden
This is practical, not moral. War is sustained by efficiency. A general who understands logistics preserves his nation’s strength for the battles that truly matter.
2.4 Capturing and Reusing the Enemy’s Equipment
Sun Zi explains how to exploit victory.
Capturing the enemy’s chariots, equipment, and troops strengthens your own army while weakening the opponent.
Important principles:
- Reward the first soldiers who seize enemy equipment
- Integrate captured chariots and supplies into your own army
- Treat captured enemy soldiers well so they can serve alongside your troops
This section emphasizes adaptability. Every battle should make your army more capable, not more depleted.
2.5 Victory Is the Goal, Not Endless Fighting
Sun Zi ends this chapter with a principle that shapes the entire Art of War:
The purpose of war is victory.
Not duration.
Not destruction.
Not prestige.
If a leader understands war correctly:
- they do not waste their soldiers
- they do not exhaust the people
- they do not chase symbolic victories
- they protect the stability of the state
A nation survives by winning quickly and decisively, then returning to stability.
This is the heart of Principle 2.
2.1
Sun Zi said: When raising an army of one hundred thousand, transporting them a thousand li, the expenses of the people inside and outside, the cost for guests and provisions, the glue and lacquer, the chariots and armor, and the daily expenditures of a thousand gold, only then will one hundred thousand troops be raised.
2.2
When one engages in prolonged warfare, supplies will be exhausted. When attacking a city, strength will be depleted. If the army is kept in the field for a long time, the resources of the state will be insufficient. Though one may have wise officers, they cannot remedy the exhaustion. When troops are exhausted and provisions are depleted, then other feudal lords will rise against you. Though you may have intelligent rulers, they cannot reverse this harm.
2.3
One who is not familiar with the harms of using troops cannot know the benefits of using troops. One who is skilled in using troops does not repeatedly requisition supplies from the people and does not overburden the state’s resources. What is taken from the enemy will suffice to feed the army. Thus, a country that is impoverished by transporting supplies from afar will be enriched by taking from the enemy. What exhausts the people is transportation from afar. What benefits the army is what is taken close at hand. Therefore, the wise general lives off the enemy. For each hundred thousand soldiers, one hundred carts of grain; for each ten thousand troops, ten thousand bundles of fodder; their armor and chariots depend on what is stored.
2.4
Therefore, a skilled general feeds his army with the enemy’s provisions. One measure of the enemy’s grain is worth twenty measures of one’s own. One measure of the enemy’s fodder is worth twenty measures of one’s own. Killing the enemy enrages them. Taking their wealth enriches you. When in battle one captures ten or more chariots, reward the first captors. Replace their flags and pennants with your own. Treat the captured troops well and use them alongside your own troops. This is called increasing one’s strength through the enemy.
2.5
Thus, in warfare, the objective is victory, not prolonged operations. Therefore, one who knows warfare does not mismanage troops, and one who knows how to command does not exhaust the people. What is essential for the state is the security of the people and the stability of the army.
2.1
作戰：孫子曰：凡用兵之法，馳車千馳，革車千乘，帶甲十萬，千里饋糧，則內外之費賓客之用，膠漆之材，車甲之奉，日費千金，然後十萬之師舉矣。
2.2
作戰：其用戰也，勝久則鈍兵挫銳，攻城則力屈，久暴師則國用不足。夫鈍兵，挫銳，屈力，彌貧，則諸侯乘其弊而起，雖有智者，不能善其後矣。故兵聞拙速，未睹巧之久也；夫兵久而國利者，未之有也。
2.3
作戰：故不盡知用兵之害者，則不能盡知用兵之利也。善用兵者，役不再籍，糧不再輸，取用于國，因糧于敵，故軍食可足也。國之貧于師者遠輸，遠輸則百姓貧，近于師者貴賣，貴賣則百姓財竭，財竭則急于丘役，力屈財彊，中原內虛于家，百姓之費，十去其七，公家之費，破車罷馬，甲冑矢弩，靡有存者。
2.4
作戰：故智將務食于敵，食敵一鍾，當吾二十鍾；𪎭秆一石，當吾二十石。故殺敵者怒也，取敵之利者貪也。故車戰，得車十乘以上，賞其先得者，而更其旌旗，車雜而乘之，卒善而養之，是謂勝敵而益強。
2.5
作戰：故兵貴勝，不貴久；故知兵之將，民之司命，國家安危之主也。