David Playfair Heatley, Diplomacy and the Study of International Relations (1919)
“ That the theory of war, if it is to be and continue a philosophical study, finds itself here in a difficulty is clear. All that is essentially inherent in the conception of war seems to fly from it, and it is in danger of being left without any point of support. ... All military art then turns itself into mere prudence.' [92] War as an instrument of policy: 'War is nothing but a continuation of political intercourse, with a mixture of other means. ”
