In any case under this Article the award of the arbitrators or the judicial decision shall be made within a reasonable time, and the report of the Council shall be made within six months after the submission of the dispute. Article 13. The Members of the League agree that, whenever any dispute shall arise between them which they recognise to be suitable for submission to arbitration or judicial settlement, and which cannot be satisfactorily settled by diplomacy, they will submit the whole subject-matter to arbitration or judicial settlement. 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, are declared to be among those which are generally suitable for submission to arbitration or judicial settlement. [Sidenote: A verbal change in the third paragraph.] For the consideration of any such dispute, the court to which the case is referred shall be the Permanent Court of International Justice, or any tribunal agreed on by the parties to the dispute or stipulated in any convention existing between them. The Members of the League agree that they will carry out in full good faith any award or decision that may be rendered, and that they will not resort to war against a Member of the League which complies therewith. In the event of any failure to carry out such an award or decision, the Council shall propose what steps should be taken to give effect thereto. Article 14. [Sidenote: Article 14 of the Covenant, verbally changed.] The Permanent Court of International Justice shall be competent to hear and determine any dispute of an international character which the parties thereto submit to it. The Court may also give an advisory opinion upon any dispute or question referred to it by the Council or by the Assembly. [Sidenote: Article 3 of the Protocol, with some words added.] The Members of the League undertake to recognize as compulsory, _ipso facto_ and without special agreement, the jurisdiction of the Permanent Court of International Justice in the cases covered by paragraph 2 of Article 36 of the Statute of the Court, but without prejudice to the right of any Member, when acceding to the special protocol provided for in the said Article and opened for signature on December 16th, 1920, to make reservations compatible with the said clause. {273} Accession to this special protocol, opened for signature on December 16th, 1920, must be given within a month after the coming into force hereof, and in the case of Members of the League hereafter admitted, within a month after such admission. [Sidenote: Article 20 of the Protocol.] Any dispute as to the interpretation of the Covenant shall be submitted to the Permanent Court of International Justice. Article 15.