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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. 4.
Art. 4. Martial Law is simply military authority exercised in accordance with the laws and usages of war. Military oppression is not Martial Law: it is the abuse of the power which that law confers. As Martial Law is executed by military force, it is incumbent upon those who administer it to be strictly guided by the principles of justice, honor, and humanity -- virtues adorning a soldier even more than other men, for the very reason that he possesses the power of his arms against the unarmed.