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Instructions for the Government of Armies of the United States in the Field (Lieber Code). 24 April 1863.
Section VIII : Armistice -- Capitulation - Art. 138.
Art. 138. The motives which induce the one or the other belligerent to conclude an armistice, whether it be expected to be preliminary to a treaty of peace, or to prepare during the armistice for a more vigorous prosecution of the war, does in no way affect the character of the armistice itself.