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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #I. Hostilities #B. Rules of conduct with regard to things #(b) Sanitary material - Art. 39.
Art. 39. In the circumstances referred to in the above paragraph, the term "ambulance" is applied to field hospitals and other temporary establishments which follow the troops on the field of battle to receive the sick and wounded.