Once the dev team manages to start working on a new system for battles,
I hope every army needs a supply line to feed the army. This would surely make generals and marshals to think more.
For the supply line, we can make caravans and traders to carry food+weapon to the armies. It might be nice to have the armies to be affected harshly when they reach a starving region without any food.
Maybe for cavalry units, remove the restriction of moving one region per turn? So they can hit the supply line?