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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #IV. Persons interned in neutral territory - Art. 83.
Art. 83. Evacuations of wounded and sick not prisoners may pass through neutral territory, provided the personnel and material accompanying them are exclusively sanitary. The neutral State through whose territory these evacuations are made is bound to take whatever measures of safety and control are necessary to secure the strict observance of the above conditions.