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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 #(e) Who may be made prisoners of war - Art. 22.
Art. 22. Individuals who accompany an army, but who are not a part of the regular armed force of the State, such as correspondents, traders, sutlers, etc., and who fall into the hands of the enemy, may be detained for such length of time only as is warranted by strict military necessity.