Inventive resupply.
Make your opponent resupply you, unknowingly hopefully.
Or just out and out gank one of his supply columns with those overly helpful civilian towns behind the lines.
Kinda like entering a village in an rpg, everyone seems nice, and then in the blink of an eye the kids are playing soccer with heads while the women play didgery doo with knives in navels as the whole town falls in on the intruders.
nice visuals.
Good point though