it would be nice to add combat lines, different military formations. For example, when you have 20 archers and 10 other soldiers, they fight defensively. Archers shoot from a distance and soldiers protect archers.
Another example would be a formation of troops carrying spears, pikes, or other long-edged weapons. It could be used against cavalry or just like the phalanx itself. Or adding a military march. Of course, such formations would be used if there is a place for something like this.
Another formation that might also be interesting is that inside or outside the walls, you can order archers to shoot a volley of arrows at enemies at a designated location. All in all, you can get inspired by these Mount and Blade Bannerlord formations or other games, movies or real historical military formations.
https://thumbs.gfycat.com/AcrobaticBetterArawana-max-1mb.gif