The ethics of war explores the moral limits and possibilities of conflict. The argument proceeds from a just war standpoint which balances rules or principles against the moral capacities and dispositions of belligerents and the particular circumstances in which they act. In this enlarged second edition, a new introduction reflects on the impact of changes to just war thinking and to the practice of war since the book’s original publication. The common criticism that traditional just war theory is incoherent, outmoded and in need of radical revision is resisted, and instead, a case is made for an ethics of war rooted in the historic tradition of just war. The concept of just war is compared with realism, militarism and pacifism; the principles of just recourse and just conduct are examined with the aid of real life examples; and a new third part addresses some of the ethical problems raised by terrorism and counterterrorism.