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Project of an International Declaration concerning the Laws and Customs of War. Brussels, 27 August 1874.
Means of injuring the enemy - Art. 13.
Art. 13. According to this principle are especially ' forbidden ':
(a) Employment of poison or poisoned weapons;
(b) Murder by treachery of individuals belonging to the hostile nation or army;
(c) Murder of an enemy who, having laid down his arms or having no longer means of defense, has surrendered at discretion;
(d) The declaration that no quarter will be given;
(e) The employment of arms, projectiles or material calculated to cause unnecessary suffering, as well as the use of projectiles prohibited by the Declaration of St. Petersburg of 1868;
(f) Making improper use of a flag of truce, of the national flag or of the military insignia and uniform of the enemy, as well as the distinctive badges of the Geneva Convention;
(g) Any destruction or seizure of the enemy's property that is not imperatively demanded by the necessity of war.