My worst defeat....

I was the Russians and my opponent was the Golden. The map was a desert map. I had an army of primarily Steppe Cavalry, Steppe Heavy Cavalry, Druzhinas and Boyars. Well, unfortunately, i had too many cavalry that couldn't catch up with the mongol horse archers, and the Mongol Heavy Cavalry ripped apart my steppe cavalry, before hitting me in the flanks and back, while the mongol horse archers darted back and forth, discharging volleys of arrows that ripped my men to pieces. My army actually held and routed some of their units, but then, their reinforcements came and it was all over.