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Convention (XIII) concerning the Rights and Duties of Neutral Powers in Naval War. The Hague, 18 October 1907.
Art. 13. If a Power which has been informed of the outbreak of hostilities learns that a belligerent war-ship is in one of its ports or roadsteads, or in its territorial waters, it must notify the said ship to depart within twenty-four hours or within the time prescribed by local regulations.