Elite troops would also be incorporated into this idea. This would also affect the enemy territory with loss of life in the General population through starvation as well as obviously consuming any trade wandering through the area - if the country is a sparsly laden one; the soldiers would begin to run out of food stocks after a certain amount of time and begin to starve - reducing the moral of the army in general.

There's a lot to this certain idea:

scroll down to screwtype and my reply especially
https://forums.totalwar.org/vb/showthread.php?t=46424