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Convention (XIII) concerning the Rights and Duties of Neutral Powers in Naval War. The Hague, 18 October 1907.
Art. 19. Belligerent war-ships may only revictual in neutral ports or roadsteads to bring up their supplies to the peace standard.
Similarly these vessels may only ship sufficient fuel to enable them to reach the nearest port in their own country. They may, on the other hand, fill up their bunkers built to carry fuel, when in neutral countries which have adopted this method of determining the amount of fuel to be supplied.
If, in accordance with the law of the neutral Power, the ships are not supplied with coal within twenty-four hours of their arrival, the permissible duration of their stay is extended by twenty-four hours.