... Grotius,was required by the law of nations (i.e., by the voluntary law) but not by the law of nature, since the law of nations ruled the realm of secondaryaction while the law of nature reigned over ... with the law of neutrality rather than of war as such.18From the standpoint of the legalconception of war, the key developments were the two dissident schools of thought, which predated the ... conception of a new body of law, whichhe called the law of nations, distinguished from the law of nature whichhad previously been the sole corpus of law dealing with war. Second was the distinction...