This is laid down in the last paragraph of Article 10, which provides that the Council shall "call upon" the Signatories to apply the sanctions.[3] As the sanctions contemplated by the Protocol are _in theory_ merely a development of the sanctions contemplated by Article 16 of the Covenant, it is interesting to note that this preliminary calling by the Council upon the States to apply the sanctions introduces a new system, at least a system which develops from the view taken by the Assembly under Article 16 of the Covenant in 1921; for in the elaborate resolutions then adopted,[4] it was stated, among other things, that the Council was to give merely an "opinion" as to whether there had been a breach of the Covenant by resort to war, but that it was for each State to decide "for itself" whether or not its duty to apply the sanctions provided by Article 16 of the Covenant had arisen. {74} The reason for this development is easy to see. Even though the sanctions of the Protocol may in theory be the same as those of Article 16 of the Covenant, _they are applicable to a very different state of facts_. The sanctions of Article 16 of the Covenant were to be applied to any Member of the League which resorted to war in disregard of certain provisions of the Covenant in Articles 12, 13 and 15, and the difficulty of determining whether or not, in a given case, a resort to war _was_ a violation of those other Articles of the Covenant was not solved, particularly as the Covenant does not preclude a resort to war in _every_ case. Under the Protocol, however, every resort to war by the parties to it is forbidden (except by way of defense or in aid of defense or perhaps in execution of a judgment of some tribunal), and a procedure which, in theory at least and probably in practice, would always determine the aggressor, is provided. For if my view is correct, an "aggressor" is a State which openly and wilfully defies the other Signatories when summoned by the Council under Article 10 of the Protocol. Consequently, it is now for the Council, upon the determination of the aggressor, to call for the application of the sanctions.