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Convention (XIII) concerning the Rights and Duties of Neutral Powers in Naval War. The Hague, 18 October 1907.
Art. 14. A belligerent war-ship may not prolong its stay in a neutral port beyond the permissible time except on account of damage or stress of weather. It must depart as soon as the cause of the delay is at an end.
The regulations as to the question of the length of time which these vessels may remain in neutral ports, roadsteads, or waters, do not apply to war-ships devoted exclusively to religious, scientific, or philanthropic purposes.