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Convention (XIII) concerning the Rights and Duties of Neutral Powers in Naval War. The Hague, 18 October 1907.
Art. 16. When war-ships belonging to both belligerents are present simultaneously in a neutral port or roadstead, a period of not less than twenty-four hours must elapse between the departure of the ship belonging to one belligerent and the departure of the ship belonging to the other.
The order of departure is determined by the order of arrival, unless the ship which arrived first is so circumstanced that an extension of its stay is permissible.
A belligerent war-ship may not leave a neutral port or roadstead until twenty-four hours after the departure of a merchant ship flying the flag of its adversary.