I'm playing the Khwarezmians on vh/vh with BGR IV submod. It was obviously impossible to stop the Mongols taking the first 2 cities, but even after that I fail to see how I can stop their hordes. With all those high experience elite units, they only lose about 20% of their army in a battle where I'm on the defensive and can set up on higher ground. Their heavy cavalry mauls through my spearmen and the artillery they start off with really hurts when trying to play defensively. Also despite trying to build economy buildings across the empire, finances are going down the drain anyway, I can't afford to keep building stacks to throw at the them. I need some advice on strategy.