The august solemnity of Latin confers on the terms jus ad bellum and jus in bello [1] the misleading appearance of being centuries old. In fact, these expressions were only coined at the time of the League of Nations and were rarely used in doctrine or practice until after the Second World War, in the late 1940s to be precise. This article seeks to chart their emergence.
1. Jus ad bellum refers to the conditions under which one may resort to war or to force in general; jus in bello governs the conduct of belligerents during a war, and in a broader sense comprises the rights and obligations of neutral parties as well.
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Interestingly enough, neither term can be found in the texts produced by other major publicists during the interwar years, nor, according to our investigations, were they used in the courses on war and peace given at the The Hague Academy of International Law or in any other courses. The breakthrough occurred only after the Second World War, when Paul Guggenheim, another disciple of the School of Vienna, drew the terminological distinction in one of the first major international law treatises of the postwar era [60]. A number of monographs subsequently took up the terms [61], which soon gained widespread acceptance and were launched on their exceptionally successful career. In a thesis written under Guggenheim’s supervision and published in 1956, Kotzsch gave them pride of place, treating them in the manner to which we have grown accustomed and which we now take for granted. [62]
60. P. Guggenheim, Lehrbuch des Völkerrechts, Vol. II, Basel, 1949, p. 778.
61. See for example F. Grob, The relativity of war and peace, New Haven, 1949, pp. 161 and 183-185.
62. The concept of war in contemporary history and international law, Geneva, 1956, pp. 84 ff.
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