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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. 136.
Art. 136. If an armistice be declared, without conditions, it extends no further than to require a total cessation of hostilities along the front of both belligerents.
If conditions be agreed upon, they should be clearly expressed, and must be rigidly adhered to by both parties. If either party violates any express condition, the armistice may be declared null and void by the other.