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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. 6.
Art. 6. All civil and penal law shall continue to take its usual course in the enemy's places and territories under Martial Law, unless interrupted or stopped by order of the occupying military power; but all the functions of the hostile government -- legislative executive, or administrative -- whether of a general, provincial, or local character, cease under Martial Law, or continue only with the sanction, or, if deemed necessary, the participation of the occupier or invader.