Leading political theologian Oliver O'Donovan takes a fresh look at some traditional moral arguments about war. Christians differ widely on this issue. The book re-examines questions of contemporary urgency, including the use of biological and nuclear weapons, military intervention, economic sanctions, and the role of the UN. It opens with a challenging dedication to the new Archbishop of Canterbury and proceeds to shed light on vital topics with which that Archbishop and others will be very directly engaged. It should be read by anyone concerned with the ethics of warfare.