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Convention (X) for the Adaptation to Maritime Warfare of the Principles of the Geneva Convention. The Hague, 18 October 1907.
Art. 2. Hospital ships, equipped wholly or in part at the expense of private individuals or officially recognized relief societies, shall likewise be respected and exempt from capture, if the belligerent Power to whom they belong has given them an official commission and has notified their names to the hostile Power at the commencement of or during hostilities, and in any case before they are employed.
These ships must be provided with a certificate from the competent authorities declaring that the vessels have been under their control while fitting out and on final departure.