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Instructions for the Government of Armies of the United States in the Field (Lieber Code). 24 April 1863.
Section VII : Parole - Art. 134.
Art. 134. The commander of an occupying army may require of the civil officers of the enemy, and of its citizens, any pledge he may consider necessary for the safety or security of his army, and upon their failure to give it he may arrest, confine, or detain them.