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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #I. Hostilities #A. Rules of conduct with regard to individuals #(b) Means of injuring the enemy - Art. 9.
' As needless severity should be avoided (Article 4
Art. 9. It is forbidden:
(a) To employ arms, projectiles, or materials of any kind calculated to cause superfluous suffering, or to aggravate wounds - notably projectiles of less weight than four hundred grams which are explosive or are charged with fulminating or inflammable substances ' (Declaration of St. Petersburg); '
(b) To injure or kill an enemy who has surrendered at discretion or is disabled, and to declare in advance that quarter will not be given, even by those who do not ask it for themselves.