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The Laws of War on Land. Oxford, 9 September 1880.
Part III : Penal sanction - Art. 86.
Art. 86. In grave cases in which reprisals appear to be absolutely necessary, their nature and scope shall never exceed the measure of the infraction of the laws of war committed by the enemy.
They can only be resorted to with the authorization of the commander in chief.
They must conform in all cases to the laws of humanity and morality.