Chapter 12 is Sun Tzu's guide to force multiplication , using fire as a weapon that destroys without requiring your soldiers to close in and fight. He opens with five specific targets:
1. Burn the enemy soldiers in their camp , strike where they sleep.
2. Burn their stores , destroy food and supplies, and the army starves itself into defeat.
3. Burn their baggage trains , cut off movement and logistics.
4. Burn their arsenals and magazines , eliminate their capacity to resupply and fight.
5. Hurl fire into their ranks , use fire as a direct battlefield weapon to create chaos.
But fire attacks are not brute force , they are conditional. Sun Tzu is precise: fire requires preparation, the right materials in position, dry weather, and wind moving in the right direction. Day and night matter too , wind rises in the day and dies at night. A general who cannot read conditions cannot use this weapon.
Once fire is set, Sun Tzu gives clear rules: if the fire erupts inside the enemy camp, attack immediately from outside. If fire is set but the enemy does not react, wait , do not attack prematurely. If conditions allow attack from the wind side, never attack against the wind.
The deeper principle is leverage: small inputs creating disproportionate outcomes. Fire is just one expression of this. Any force multiplier , a key hire, a strategic partnership, a piece of information at the right moment , follows the same logic. Identify the conditions required, prepare the material, and act only when conditions are right.
The chapter closes with what may be Sun Tzu's most important restraint principle:
'Move not unless you see an advantage. Use not your troops unless there is something to be gained. Fight not unless the position is critical.'
And then his sharpest warning against emotion in strategy: an angry ruler can become happy again. A resentful general can become content again. But a kingdom that has once been destroyed cannot come back into being. The dead cannot be brought back to life. Never make permanent decisions from temporary emotions. Anger passes. The consequences of acting in anger do not.
