Ken,
Please see Page 189 of Mendoza's book:
"Nevertheless, the men endured the harsh conditions until the Quartermaster's Department finally furnished Longstreet's command with the requisite footwear in February 1864."
1500 shoes came from the people of South Carolina - sent up the railroad into Virginia and then down the railroad to Longstreet in East Tennessee. Additionally, uniforms came from North Carolina via the same route. See Jeff Wert's Longstreet bio - Page 366.
Finally, from Longstreet's memoirs - Page 521 - Then came the opening of the railroad and, lo and behold, a shipment of 3000 shoes from General Lawton, Quartermaster General." Lawton was at the Richmond Depot.
Lastly, Longstreet went back to the ANV via this same railroad from which came these, and other, supllies.
Greg Biggs