But is it really more true of the First World War than of any other war? And what do principles represent, if in the last resort they are not worth fighting for? We may wonder why the belligerents of 1914 were ready to endure so much, but we do so from the perspective of a new century and possessed of values that have themselves been shaped by the experience both of the First World War and of later wars. It behoves us to think as they did then, not as we do now.

