Feed on the Enemy

The skillful soldier does not raise a second levy, neither are their supply wagons loaded more than twice. Bring war material from home, but forage on the enemy.

There is a profound efficiency here: do not keep going back to your own reserves. Learn to use what is already in the environment. The existing momentum of a situation, the infrastructure already in place — these are all available to you if you stop insisting on bringing everything from home.

This passage contains one of Sun Tzu's most practical insights: logistical self-sufficiency through captured resources. A cart of enemy provisions is worth twenty of your own because it costs the enemy one cart and saves you the transport. Beyond warfare, leveraging existing assets rather than building everything from scratch can be a decisive advantage. The five fundamentals are not a checklist but a way of seeing the whole field. The passage belongs to Sun Tzu's argument that a campaign must sustain itself rather than repeatedly drain the home state. Taking supplies from an enemy was an ancient military practice with severe consequences for civilians; it should not be romanticized as clever resourcefulness. The non-military lesson is to notice existing capacity before adding more inputs. Reuse, maintenance, and cooperation can be sensible, but they are not the same as taking what belongs to someone else. Efficiency must remain compatible with consent, law, and stewardship. The chapter's logistics are inseparable from the ethics of taking supplies in wartime. Modern readers should keep the distinction between reusing available capacity and appropriating another person's property. The durable insight is stewardship: know what you already have, what it costs to maintain, and who is asked to pay for the next demand. Resourcefulness is not permission to externalize costs onto people with less power Resourcefulness is not permission to externalize costs onto people with less power.