ICRC databases on international humanitarian law
Treaties and Documents
1949 Conventions and Additional Protocols, and their Commentaries
Historical Treaties and Documents
The Laws of War on Land. Oxford, 9 September 1880.
Part I : General principles - Art. 4.
Art. 4. The laws of war do not recognize in belligerents an unlimited liberty as to the means of injuring the enemy.
They are to abstain especially from all needless severity, as well as from all perfidious, unjust, or tyrannical acts.