Abstract
It is widely believed that some wars are just, and that the paradigm case of a just war is a defensive war. A familiar strategy used to justify defensive war is to infer its permissibility from the case of self-defensive killing. I show, however, that the permission to defend oneself does not justify killing, but instead calls for nonviolent resistance. I conclude that on the account of self-defense I develop, the appropriate way to respond to a war of aggression is not by prosecuting a defensive war, but by engaging in a form of nonviolence I call pacific resistance.