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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. 137.
Art. 137. An armistice may be general, and valid for all points and lines of the belligerents; or special, that is, referring to certain troops or certain localities only.
An armistice may be concluded for a definite time; or for an indefinite time, during which either belligerent may resume hostilities on giving the notice agreed upon to the other.