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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 I : On means of injuring the enemy, sieges, and bombardments - Art. 25.
Art. 25. The attack or bombardment of towns, villages, habitations or buildings which are not defended, is prohibited.