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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #I. Hostilities #A. Rules of conduct with regard to individuals #(c) The sick and wounded, and the sanitary service - Art. 13.
Art. 13. Persons employed in hospitals and ambulances -- including the staff for superintendence, medical service, administration and transport of wounded, as well as the chaplains, and the members and agents of relief associations which are duly authorized to assist the regular sanitary staff -- are considered as neutral while so employed, and so long as there remain any wounded to bring in or to succour.