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Rules concerning the Control of Wireless Telegraphy in Time of War and Air Warfare. Drafted by a Commission of Jurists at the Hague, December 1922 - February 1923.
Part II: Rules of Air Warfare#Chapter IV: Hostilities#Bombardment. - Art. 24.
Art. 24. 1. An air bombardment is legitimate only when is directed against a military objective, i.e. an objective whereof the total or partial destruction would constitute an obvious military advantage for the belligerent;
2. Such bombardment is legitimate only when directed exclusively against the following objectives: military forces, military works, military establishments or depots, manufacturing plants constituting important and well-known centres for the production of arms, ammunition or characterized military supplies, lines of communication or of transport which are used for military purposes.
3. Any bombardment of cities, towns, villages, habitations and building which are not situated in the immediate vicinity of the operations of the land forces, is forbidden. Should the objectives specified in paragraph 2 be so situated that they could not be bombed but that an undiscriminating bombardment of the civil population would result therefrom, the aircraft must abstain from bombing;
4. In the immediate vicinity of the operations of the land forces, the bombardment of cities, towns, villages, habitations and buildings is legitimate, provided there is a reasonable presumption that the military concentration is important enough to justify the bombardment, taking into account the danger to which the civil population will thus be exposed;
5. The belligerent State is bound to pay compensation for damage caused to persons or property, in violation of the provisions of this Article, by any one of his agents or any one of its military forces.