A just war is, on the one hand, a war that must be won. If one is justified in going to war in the first place, one must also be justified in doing everything in one’s power, within reason, to win that war. On the other hand, a tension is thus evident between the requirement to pursue victory in a just war and the constraints built into the idea of just war itself. As they pursue the victory that their cause demands, belligerents fighting a just war will unfortunately, but inevitably, come under pressure to set aside restraints and embrace all means necessary to win. Victory, then, appears to be a concept that just war theorists cannot live with but also cannot live without. This chapter seeks to make sense of this situation and to reflect upon what it tells us about the limitations but also necessity of just war.