The twelfth chapter addresses the tactical use of fire as a weapon, classifying five methods of incendiary attack. But its deepest value lies in its closing passages, which contain the Art of War's most explicit ethical statement: war should never be waged from anger, and the destruction it causes cannot be undone. A kingdom once destroyed cannot be restored; the dead cannot be brought back to life.

The title 火攻 (Huǒgōng) combines 火 (Huǒ, fire) with 攻 (Gōng, attack).

Five Methods of Fire Attack

Sūnzǐ identifies five targets for incendiary operations: burning soldiers in their camp, burning supply stores, burning baggage trains, burning arsenals, and using fire to disrupt formations and lines of communication. The chapter provides tactical guidance on timing (fire attacks require dry conditions and favorable wind direction) and on coordinating fire with troop movements to exploit the chaos it creates.

While the specific military application of fire is historically bound, the underlying principle is timeless: certain forces, once unleashed, are difficult to control. The commander who uses fire must account for the wind's direction, the environment's flammability, and the risk that the fire turns against his own forces. Power that cannot be controlled is not power — it is destruction.

The Warning Against Emotion

The chapter's final passages shift from tactics to ethics. Sūnzǐ declares that the ruler must not mobilize armies out of anger, and the general must not engage in battle out of resentment. If it serves the state's interest, act. If it does not, halt. Anger may turn to contentment; resentment may become pleasure. But a state once destroyed cannot be restored, and the dead do not return to life.

This is among the most Daoist passages in the entire text. The Dàodéjīng repeatedly warns against acting from emotional impulse. The Wudang combat ethic — that martial skill exists to preserve life, not to destroy it — aligns directly with Sūnzǐ's restraint. The practitioner who fights from anger has already lost control. The practitioner who fights from necessity, with a clear mind and precise intent, fights as the text demands: with full awareness of consequences and the minimum force required.

Connection to Practice

The fire metaphor carries into training: Fālì (发力, power emission) is the martial equivalent of a controlled burn. The internal energy gathered during the Yīn phase is released in a directed, decisive burst — not a conflagration, but a precision strike. The practitioner who cannot control the timing, direction, and magnitude of power release — who "sets fire" without accounting for the wind — destroys his own structure.