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Convention (XIII) concerning the Rights and Duties of Neutral Powers in Naval War. The Hague, 18 October 1907.
Art. 24. If, notwithstanding the notification of the neutral Power, a belligerent ship of war does not leave a port where it is not entitled to remain, the neutral Power is entitled to take such measures as it considers necessary to render the ship incapable of taking the sea during the war, and the commanding officer of the ship must facilitate the execution of such measures.
When a belligerent ship is detained by a neutral Power, the officers and crew are likewise detained.
The officers and crew thus detained may be left in the ship or kept either on another vessel or on land, and may be subjected to the measures of restriction which it may appear necessary to impose upon them. A sufficient number of men for looking after the vessel must, however, be always left on board.
The officers may be left at liberty on giving their word not to quit the neutral territory without permission.