Rather than command the whole army, you’ll command one division – the front, for example, or perhaps the cavalry. You can ignore them, but there may be repercussions on the strategic map if you do.
You’ll still fight directly and command troops, but a new wrinkle is that you, too, have a boss, who will give you orders to follow – screen our archers from their cavalry, charge their flanks, that sort of thing. Taleworlds reckon they can fit up to 600 soldiers on the field at once now, and possibly more if they can further optimise the game ahead of release. That said, battles are the focus of the demo I’m about to play.