Michael Howard, The Causes of Wars and Other Essays, 2nd ed. (Cambridge, Mass: Harvard University Press, 1984).
"Whatever may be the underlying causes of international conflict, even if we accept the role of atavistic militarism or of military-industrial complexes or of socio-biological drives or of domestic tensions in fuelling it, wars begin with conscious and reasoned decisions based on the calculation, made by both parties, that they can achieve more by going to war than by remaining at peace" (22).
Wide ranging and often rambling.