Indeed, in view of the other provisions of the Protocol, it is very difficult to see any substantial difference between these so-called defensive agreements and the undertakings[[1]] which, by Article 13, States which are signatory to the Protocol may voluntarily give to the Council regarding the armed forces which might be used in the application of the sanctions. I say that the two things are similar for this reason: if in a given case the Council decides that the military sanctions are to be applied any Signatory is then entitled, at least if it chooses, to use the whole of its armed forces against the aggressor. This being so, the use of a specified portion of these forces in any given case comes to just the same thing whether it arises from the general agreement to apply sanctions or from a particular undertaking with the Council or from a particular agreement with another Signatory.
We may go to this length in thinking of these defensive agreements hereafter; in view of the fact that they must be public that any Member of the League may adhere to them and that they cannot be performed until the Council of the League says so, there could be in such a paper no effective provision which would go beyond the engagements under the Protocol itself.
Article 13 of the Protocol says that these separate agreements may be acceded to by any Member of the League of Nations. This language would include a Member of the League which was not a signatory of the Protocol. Under Article 13, it is only the States signatory to the Protocol which may make separate agreements. The point is doubtless of no real importance; but it cannot be intended that these separate agreements, if any be made, shall be acceded to by States other than those bound by the Protocol, for any such separate agreement would be in reality a paper subsidiary to the Protocol.
[[1]] Whether these "undertakings" would have the same legal quality as a treaty is at least doubtful.
CHAPTER XIV.
THE PROTOCOL AND ARTICLE TEN OF THE COVENANT.
It is to be remembered that in this portion of the discussion consideration is given only to the relations inter se of the Signatories to the Protocol.