(d) The declaration that no quarter will be given.
(e) The use of arms, projectiles, or substances which may cause unnecessary suffering, as well as the use of the projectiles prohibited by the declaration of St. Petersburg in 1868.[499]
(f) Abuse of the flag of truce, the national flag, or the military insignia or uniform of the enemy, as well as the distinctive badges of the Geneva Convention.
(g) All destruction or seizure of the property of the enemy which is not imperatively required by the necessity of war.
Art. 14. Stratagems and the employment of means necessary to procure intelligence respecting the enemy or the country (subject to the provisions of Art. 36), are considered as lawful means.
Chapter IV. Of Sieges and Bombardments
Art. 15. Fortified places are alone liable to be besieged. Towns, agglomerations of houses or villages, which are open and undefended, cannot be attacked or bombarded.
Art. 16. But if a town or fortress, agglomeration of houses, or village be defended, the commander of the attacking forces should, before commencing a bombardment, and except in the case of surprise, do all in his power to warn the authorities.
Art. 17. In the like case all necessary steps should be taken to spare, as far as possible, buildings devoted to religion, arts, sciences, and charity, hospitals and places where sick and wounded are collected, on condition that they are not used at the same time for military purposes.
It is the duty of the besieged to indicate these buildings by special visible signs to be notified beforehand by the besieged.