How do we frame decisions to use or abstain from military force? Who should do the killing? Do we need new paradigms to guide the use of force? And what does “victory” mean in contemporary conflict? 

In many ways, these are timeless questions. But they should be revisited in light of changing circumstances in the twenty-first century. The post–Cold War, post-9/11 world is one of contested and fragmented sovereignty: contested because the norm of territorial integrity has shed some of its absolute nature, fragmented because some states do not control all of their territory and cannot defeat violent groups operating within their borders. Humanitarian intervention, preventive war, and just war are all framing mechanisms aimed at convincing domestic and international audiences to go to war—or not, as well as to decide who is justified in legally and ethically killing. The international group of scholars assembled in this book critically examine these frameworks to ask if they are flawed, and if so, how they can be improved. Finally, the volume contemplates what all the killing and dying is for if victory ultimately proves elusive.

The just war tradition is central to the practice of international relations, in questions of war, peace, and the conduct of war in the contemporary world, but surprisingly few scholars have questioned the authority of the tradition as a source of moral guidance for modern statecraft. Just War: Authority, Tradition, and Practice brings together many of the most important contemporary writers on just war to consider questions of authority surrounding the just war tradition.

Authority is critical in two key senses. First, it is central to framing the ethical debate about the justice or injustice of war, raising questions about the universality of just war and the tradition’s relationship to religion, law, and democracy. Second, who has the legitimate authority to make just-war claims and declare and prosecute war? Such authority has traditionally been located in the sovereign state, but non-state and supra-state claims to legitimate authority have become increasingly important over the last twenty years as the just war tradition has been used to think about multilateral military operations, terrorism, guerrilla warfare, and sub-state violence. The chapters in this collection, organized around these two dimensions, offer a compelling reassessment of the authority issue’s centrality in how we can, do, and ought to think about war in contemporary global politics.