I watched the Carli-Orson battle, and in my opinion, Orson shouldn't move anywhere at all, but simply stand in place and kill all of Carli's troops with a direct attack from the hero or with crystals (kill the cart and the ballista). If Orson's troops start to move forward even a little, they will most likely die from a direct attack. And we should kill the spear masters first, not the harpooners, although the harpooners hit harder from a distance, but they have few shots, and the masters are much stronger in melee combat later.

I once defended with Orson, and Alboglabr came to me with a full set of runes and a devastating zapind, wiping out all the necromancers. There, many troops huddle near the shield, exposing themselves to the dragon's breath and the chain lightning of the jarls. It also becomes quite problematic and dangerous to destroy the cart, because after teleporting, the skeletons are left alone in the rear and are destroyed, and the liches will most likely be blocked. You just need to understand what tactics the opponent is using, and then you can apply a counter-tactic.