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Instructions for the Government of Armies of the United States in the Field (Lieber Code). 24 April 1863.
Section I : Martial law -- Military jurisdiction -- Military necessity -- Retaliation - Art. 11.
Art. 11. The law of war does not only disclaim all cruelty and bad faith concerning engagements concluded with the enemy during the war, but also the breaking of stipulations solemnly contracted by the belligerents in time of peace, and avowedly intended to remain in force in case of war between the contracting powers.
It disclaims all extortions and other transactions for individual gain; all acts of private revenge, or connivance at such acts.
Offenses to the contrary shall be severely punished, and especially so if committed by officers.