1. Robert Gerwarth and John Horne eds., War in Peace: Paramilitary Violence in Europe after the Great War (Oxford, 2012).
2. Jan Ifversen, ‘The Crisis of European Civilization After 1918’, in Menno Spiering and Michael Wintle eds., Ideas of Europe Since 1914: The Legacy of the First World War (Basingstoke, 2002), p. 14.
3. Paul Valéry, ‘The Crisis of the Mind’, in Valéry ed., History and Politics (London, 1962), p. 23.
4. H.G. Wells, The Salvaging of Civilization (London, 1921), p. 1.
5. Goldsworthy Lowes Dickinson, War, its Nature, Cause, and Cure (London, 1923), pp. 36–39.