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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #III. Prisoners of war #A. Rules for captivity - Art. 65.
Art. 65. Every prisoner is bound to give, if questioned on the subject, his true name and rank. Should he fail to do so, he may be deprived of all, or a part, of the advantages accorded to prisoners of his class.