“(18) The measures which the Allied and Associated Powers shall have the right to take in case of voluntary default by Germany, and which Germany agrees not to regard as acts of war, may include economic and financial prohibitions and reprisals, and in general such other measures as the respective Governments may determine to be necessary in the circumstances.”

There is also a provision in Article 430 of the Treaty, by which any part of the occupied area which has been evacuated may be reoccupied if Germany fails to observe her obligations with regard to Reparation.

The French Government base their contention on the words “and in general such other measures” in § 18, arguing that this gives them an entirely free hand. The sentence taken as a whole, however, supports, on the principle of ejusdem generis, the interpretation that the other measures contemplated are of the nature of economic and financial reprisals. This view is confirmed by the fact that the rest of the Treaty narrowly limits the rights of occupying German territory, which, as M. Tardieuʼs book shows, was the subject of an acute difference of opinion between France and her Associates at the Peace Conference. There is no provision for occupying territory on the right bank of the Rhine; and the only provision for occupation in the event of default is that contained in Article 430. This Article, which provides for reoccupation of the left bank in the event of default, would have been entirely pointless and otiose if the French view were correct. Indeed the theory, that at any time during the next thirty years any Ally can invade any part of Germany on the ground that Germany has not fulfilled every letter of the Treaty, is on the face of it unreasonable.

In any case, however, §§ 17, 18 of Annex II. of the Reparation Chapter only operate after a specific procedure has been set on foot by the Reparation Commission. It is the duty of the Reparation Commission to give notice of the default to each of the interested Powers, including presumably the United States, and to recommend action. If the default is voluntary—there is no provision as to who is to decide this—then the paragraphs in question become operative. There is no warrant here for isolated action by a single Ally. And indeed the Reparation Commission have never so far put this procedure in operation.

If, on the other hand, Germany is alleged to be in default under some other Chapter of the Treaty, then the Allies have no recourse except to the League of Nations; and they are bound to bring into operation Article 17 of the Covenant, which provides for the case of a dispute between a member of the League and a non–member. That is to say, apart from procedure by the Reparation Commission as set forth above, breaches or alleged breaches of this Treaty are in precisely the same position as breaches of any other treaty between two Powers which are at peace.

According to Article 17, in the event of a dispute between a member of the League and a State which is not a member of the League, the latter “shall be invited to accept the obligations of membership in the League for the purposes of such dispute, upon such conditions as the Council may deem just. If such invitation is accepted, the provisions of Articles 12 to 16 inclusive shall be applied, with such modifications as may be deemed necessary by the Council. Upon such invitation being given, the Council shall immediately institute an inquiry into the circumstances of the dispute, and recommend such action as may seem best and most effectual in the circumstances.”

Articles 12 to 16 provide, amongst other things, for arbitration in any case of “disputes as to the interpretation of a Treaty; as to any question of international law; as to the existence of any fact which, if established, would constitute a breach of any international obligation; or as to the extent and nature of the reparation to be made for any such breach.”

The Allies as signatories of the Treaty and of the Covenant are therefore absolutely precluded in the event of a breach or alleged breach by Germany of the Treaty, from proceeding except under the power given to the Reparation Commission as stated above, or under Article 17 of the Covenant. Any other act on their part is illegal.

In any case it is obligatory on the Council of the League, under Article 17, to invite Germany, in the event of a dispute between Germany and the Allies, to accept the obligations of membership in the League for the purposes of such dispute, and to institute immediately an inquiry into the circumstances of the dispute.