Donald Horward’s book on the Twin Sieges of Ciadad Ciadad Rodrigo and Almeida has a chapter that discusses the difficulties Massena had feeding the troops.

I’d like to read more about the butchers and bakers etc that were part of the army, bit French ad British. I’ve read a number of references to soldiers building ovens, harvesting and grinding grain. Cattle and sheep travelled on the hoof.