In the Declaration of St. Petersburg of 1868 the signatory States recognized that the object of war is to weaken the enemy's military forces, for which it is sufficient to disable the greatest possible number of men, and that this object would be exceeded by the employment of arms which uselessly aggravate the sufferings of disabled men or render their death inevitable.
This principle was repeated in Article 23(e) of the Regulations annexed to The Hague Convention No. IV of 1907 concerning the laws and customs of war on land. That article forbids the employment of arms, projectiles or material calculated to cause unnecessary suffering. The authentic French text of the article referred to “des armes, des projectiles ou des matières propres à causer des maux superflus” whereas the English text of the same article referred to “arms, projectiles or material calculated to cause superfluous injury”.