Committing one's country to war is a grave decision. Governments often have to make tough calls, but none are quite so painful as those that involve sending soldiers into harm's way, to kill and be killed. The idea of 'just war' informs how we approach and reflect on these decisions. It signifies the belief that while war is always a wretched enterprise it may in certain circumstances, and subject to certain restrictions, be justified. Boasting a...