I managed to destroy the Mongol army by hitting them with the hundred Byzantine cavalry I commanded and then withdrawing, hitting then withdrawing etc. as the Horde approached my force.
After that I charged some kataphraktoi forward, devastating their foot soldiers and waited for them to reach me. When they did, I got my woodsmen and urban militia to fight them (remember their anti-armour bonus)while steppe cavalry and kataphraktoi flanked their force and cut them down. After that, bringing down their reinforcements was a simple task, and so the Byzantine Empire managed to hold Khazar against the Mongols.
In Volga-Bulgaria, the lone defender (for the purpose of this post, we'll call him Harold Bunshwun-Nobvaikulingson) was not so fortunate and Volga-Bulgaria was lost for a very short time!
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