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Manual of the Laws of Naval War. Oxford, 9 August 1913.
Section V : On the rights and duties of the belligerent with regard to individuals - Art. 83.
Art. 83. Any war-ship belonging to a belligerent may demand that sick, wounded or shipwrecked men on board military hospital ships, hospital ships belonging to relief societies or to private individuals, merchant ships, yachts, or boats, whatever the nationality of these vessels, should be handed over.