There are some idealistic persons who believe that morality and war are incompatible. War is bestial, they hold, war is devilish; in its presence it is absurd, almost farcical, to talk about morality. That would be so if morality meant the code, for ever unattained, of the Sermon on the Mount. But there is not only the morality of Jesus, there is the morality of Mumbo Jumbo. In other words, and limiting ourselves to the narrower range of the civilised world, there is the morality of Machiavelli and Bismarck, and the morality of St. Francis and Tolstoy. The fact is, as we so often forget, and sometimes do not even know, morality is fundamentally custom, the _mores_, as it has been called, of a people. It is a body of conduct which is in constant motion, with an exalted advance-guard, which few can keep up with, and a debased rearguard, once called the black-guard, a name that has since acquired an appropriate significance. But in the substantial and central sense morality means the conduct of the main body of the community. Thus understood, it is clear that in our time war still comes into contact with morality. The pioneers may be ahead; the main body is in the thick of it. That there really is a morality of war, and that the majority of civilised people have more or less in common a certain conventional code concerning the things which may or may not be done in war, has been very clearly seen during the present conflict. This moral code is often said to be based on international regulations and understandings. It certainly on the whole coincides with them. But it is the popular moral code which is fundamental, and international law is merely an attempt to enforce that morality. The use of expanding bullets and poison gases, the poisoning of wells, the abuse of the Red Cross and the White Flag, the destruction of churches and works of art, the infliction of cruel penalties on civilians who have not taken up arms--all such methods of warfare as these shock popular morality. They are on each side usually attributed to the enemy, they are seldom avowed, and only adopted in imitation of the enemy, with hesitation and some offence to the popular conscience, as we see in the case of poison gas, which was only used by the English after long delay, while the French still hesitated. The general feeling about such methods, even when involving scientific skill, is that they are "barbarous."