I haven't played MTW2 but the Mongols in MTW1 were similar. They are supposed to be a rampaging horde and they are supposed to expand rather quickly and take a lot of territory. Their cavalry based armies are supposed to be difficult to defeat. Historically their empire stretched from China to Russia to Persia to the borders of Egypt and much of Asia Minor. The Khanate of the Golden Horde were just the western part.
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