The purported conferral of jurisdiction in the present case is upon Ch. III courts. Conduct which the Act makes punishable as a "war crime" is not punishable under the Act as an offence against international law. It is punishable as a distinct and independently defined indictable offence under the municipal law of the Commonwealth. Nor is that conduct confined to violations of international law. The conduct which the Act retroactively makes punishable as a crime under municipal law need not have been a crime against international law at the time it was committed. The elements of the indictable offence of a "war crime" are identified by ss. 6, 7, 9 and 10 of the Act without reference to international law. International law becomes relevant only if a defence is raised, under s. 17(2), that the conduct which constitutes a "war crime" under ss. 6 and 7 was "permitted by the laws, customs and usages of war" and "was not under international law a crime against humanity". That defence can be relied on only if "there is evidence of the existence of the facts" which constitute it (s. 17(4)). More important, even where there is such evidence, the validity of a defence under s. 17(2) is not to be determined by reference only to international law. Section 17(2) is expressly made subject to s. 16 which, subject to presently irrelevant qualifications, excludes (except as a plea of mitigation) the defence of government or superior orders. At the time of the alleged offences in the present case (i.e. prior to June 1943), it is clear beyond real argument that the stage had not been reached where customary international law unqualifiedly regarded a subordinate (as distinct from his State) as being individually guilty of a breach of the law and customs of war in circumstances where he had merely acted in obedience to superior orders which he was bound to obey under his national law: see, e.g., Wheaton's Elements of International Law, 6th ed. (1929), vol. II, pp. 1159-1160; Oppenheim, International Law, 5th ed. (1935), vol. II, pp. 453-454; the United States Rules of Land Warfare, (1940), Art. 347; British Manual of Military Law, 7th ed. (1929), Art. 443; Lauterpacht, The Law of Nations and the Punishment of War Crimes, The British Year Book of International Law 58, vol. XXI (1944), at pp. 69-74; Pal, Crimes in International Relations (1955), pp. 382-384; Röling, The Law of War and the National Jurisdiction since 1945, Recueil des Cours (1960-II), vol. 100, pp. 372-377; History of the War Crimes Commission, pp. 274-288; Stone, op. cit., p. 362; Detter De Lupis, The Law of War (1987), pp. 357-358; and, as regards Australia, the Manual of Military Law 1941 which recognized the defence (Ch. XIV, par. 443) but which was amended on 30 September 1944 to deny it. The importance of the express exclusion of a defence of superior orders is not so much that such a defence was available at international law at least in some circumstances at the time of an alleged offence under the Act. It is that the legislative exclusion of the defence - like the legislative indifference to the question whether, at the time of an alleged offence, customary international law directly established or made punishable the criminality of individuals for breaches of the law of war (see above) - underlines the fact that what the Act is concerned to make punishable is a new crime against the law of the Commonwealth which the Act itself retrospectively creates. If the elements of an indictable offence as defined by ss. 6, 7, 9 and 10 are present and the qualified defence under s. 17(2) is not raised or, if raised, does not prevail, it matters not for the purposes of the Act whether the accused was or was not personally guilty of a crime under international law.