Energy

Managing a large force uses the same principles as managing a small one — it is simply a matter of organization. Commanding a large army in battle works the same as commanding a small one — it is simply a matter of clear communication systems. Chapter 5 establishes that the principles of war are scale-invariant: what works for a squad works for a hundred thousand men, adjusted for the mechanisms of coordination. In any battle, the direct approach is used to engage the enemy, but indirect methods are what deliver victory. Indirect tactics, skillfully applied, are as infinite as heaven and earth, as inexhaustible as rivers and streams.

There are only five musical notes, yet their combinations produce more melodies than can ever be heard. Only five primary colors, yet their combinations produce more shades than the eye can distinguish. Only five basic tastes, yet their combinations yield more flavors than can be tasted. In battle, there are only two methods — direct and indirect — yet their combination generates an infinite variety of tactics. The momentum of troops in action is like a torrent powerful enough to roll boulders downstream. The quality of timing is like a falcon's strike — precise, swift, devastating. Energy is like drawing a crossbow; timing is like releasing the bolt. These two qualities, combined, define the great fighter: ferocious in momentum, razor-sharp in timing.

The chapter closes with the image that has defined Sun Tzu's theory of force. The brilliant commander relies on the power of combined momentum, not on the heroics of individuals. He selects the right people and unleashes their collective force. When you harness combined momentum, your soldiers become like boulders on a slope. A boulder sits still on flat ground, but when the configuration places it correctly and the moment comes, it rolls. The energy of well-led soldiers is like a round boulder rolling down a mountain thousands of feet high — that is the nature of shi, the force released by right configuration.