I know this is an old thread but I've had the same experience in all of my play through. The Khan dominates every faction.In my last play through before i could even start my first caravan and build an army they had taken all of the sturgian lands in the north. Also the valandians had taken everything in the southern portion of sturgia. I started a new play through thinking with the buff to sturgian troops at least the wont lose their cities and castles. Wrong. They were a defeated faction before i could join to help.
I am currently experimenting with a 50% archer, 10% Pikemen,Ulfhednar mixed into their formation(60%) and 15% Sturgian Veteran Warriors with 25% Valandian Cavalry army. I refuse to have to use Horse Archers because F()*&k them.
Problems i see so far is i can't seem to get my cavalry to prioritize attacking the enemy infantry and archers, they just follow the horse archers around the map and leave the infantry to fight the whole foot battle and taking the horse archer out of range of my archers.
I understand the historical aspect of the Khan Horse Archers but wow is it not fun. If only we could have some diplomacy and could unit all of the empire, Valandia, Sturgia, and Battania we might be able to stop them taking everything. Once the Khan is defeated we could go back to killing each other like normal.