The world has grown used to U.S. military intervention. It condemns it and is then comforted by its condemnations. But losing wars after years of struggle – or staying in wars you are losing for moral reasons or to hide the reality – makes no sense. The U.S. has to control where and how it goes to war. Its notion of victory includes the moral transformation of ancient people who do not think they are immoral. A moral principle on terrain well known, and weapons suited for it, works. A moral principle on unfamiliar terrain and inappropriate weapons is less effective.