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Convention (II) with Respect to the Laws and Customs of War on Land and its annex: Regulations concerning the Laws and Customs of War on Land. The Hague, 29 July 1899.
Art. 2. The provisions contained in the Regulations mentioned in Article I are only binding on the Contracting Powers, in case of war between two or more of them.
These provisions shall cease to be binding from the time when, in a war between Contracting Powers, a non-Contracting Power joins one of the belligerents.