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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.
ANNEX TO THE CONVENTION : Regulations respecting the laws and customs of war on land #Section II : On hostilities #Chapter V : On armistices - Art. 40.
Art. 40. Any serious violation of the armistice by one of the parties gives the other party the right to denounce it, and even, in case of urgency, to recommence hostilities at once.