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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #II. Occupied territory #C. Rules of conduct with regard to property #(b) Private property - Art. 56.
Art. 56. Impositions in kind (requisitions) demanded from communes or inhabitants should be in proportion to the necessities of war as generally recognized, and in proportion to the resources of the country.
Requisitions can only be made on the authority of the commander in the locality occupied.