Well I usually survive till the end of the round most of the time using a steppe horse. It's all about evasion, as long as you keep an eye out, no other cav can touch you when you're dodging on a steppe horse. Archers are a bit more of a problem, but keep your distance and learn to dodge the arrows as well. I kinda got sick of always being the last left on my team against 15-20 enemies at which point I just have to let my self be killed, so I retired to take a gen off HA.
Get a steppe horse!