 Many thanks to Thomas Pogge for his comments on this entry, which were a great benefit throughout. This entry draws on all my work in just war theory, and so I owe a great debt to the many philosophers who have contributed so much to my understanding of these issues, both in their published work and in conversation. Most of the people in the bibliography deserve a mention, but I reserve particular thanks for Henry Shue, Jeff McMahan, and David Rodin, for setting me on this path.