OR, Series 1, Vol. 31, Part 3, Page 643

November 6, 1863
General J. E. Johnston
   Provisions cannot be spared by the commissary. The president of Demopolis railroad {Alabama & Mississippi Rivers RR} can buy reasonable supplies for those in employ as laborers and otherwise, and they will be under the law exempt from impressment.
   See General Orders, No. 31.
James A. Seddon
Secretary of War