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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. 69.
Art. 69. The government into whose hands prisoners have fallen is charged with their maintenance.
In the absence of an agreement on this point between the belligerent parties, prisoners are treated, as regards food and clothing, on the same peace footing as the troops of the government which captured them.