The second chapter addresses the economics of warfare — the devastating costs of maintaining armies, the danger of prolonged campaigns, and the imperative of efficiency. Sūnzǐ's central argument: no state has ever profited from extended conflict. Speed and decisiveness preserve resources; delay destroys them.

The title 作战 (Zuòzhàn) means "conducting warfare" or "waging war." The character 作 (Zuò) means to make or to do. The character 战 (Zhàn) means battle or war.

The Cost of War

Sūnzǐ opens with a detailed accounting of what it costs to field an army of 100,000 men: chariots, provisions, equipment, entertainment of allies, materials — a thousand ounces of gold per day. This is not abstract moralizing. It is a concrete warning: war is expensive, and the general who does not understand the economic dimension of conflict will ruin his state regardless of tactical brilliance.

When weapons grow dull and morale flags, when the treasury is exhausted and the people are overtaxed, rival states will exploit the weakness. No amount of wisdom can recover from this position.

Speed Over Perfection

The chapter's key insight: there are cases of armies winning through imperfect haste, but never through carefully planned delay. Quick resolution — even if imperfect — is superior to a flawless campaign that drags on. The longer a conflict continues, the more it favors the defender and the terrain, and the more it drains the aggressor.

This principle applies directly to combat at the individual level. In Wudang martial arts, the practitioner who hesitates — waiting for the perfect opening, overanalyzing the opponent — loses initiative. Fālì (发力, power emission) in Liǎngyí practice demands decisive, instantaneous commitment. The Yáng phase is a detonation, not a negotiation.

Foraging on the Enemy

Sūnzǐ advocates obtaining supplies from the enemy's territory rather than transporting them from home — converting the enemy's resources into your own. One captured cartload is worth twenty transported from home. This principle of economy — achieving results with the opponent's energy rather than expending your own — is the strategic expression of the Wudang combat maxim 借力打力 (Jiè lì dǎ lì, "borrow the opponent's force to strike").

Connection to Wudang Practice

The chapter's emphasis on economy resonates with the entire philosophy of internal martial arts. External styles accumulate force through muscular effort — the martial equivalent of transporting supplies over long distances. Internal styles cultivate efficiency: using structure, timing, and the opponent's own momentum to achieve disproportionate results. The principle 四两拨千斤 (Sì liǎng bō qiān jīn — four ounces deflects a thousand pounds) is Sūnzǐ's economic logic applied to the human body.

The warning against prolonged engagement also applies to sparring and Tuīshǒu: extended grappling with a stronger opponent drains your resources. The skilled practitioner resolves encounters quickly — reading, redirecting, and issuing force in a single moment rather than sustaining an attritional exchange.