These are great fun. A couple of halberdiers or some tough anti-armor troops will really have a go at the Horde. I like to use a unit of Halberdiers, a unit of Huscarles, and a Brigand. Defend every gate with something. BTW, try to get a citadel and babrican in Khazar in time. They always assualt it. The babrican blows them away while they are attacking. The brigand is for a little shooting up of the eventual HA mob that comes, stands there and shoots at your guys guarding the gate. I also include 3-4 Catapults if I can. These shoot everything they have at mobs of troops outside the gate (but not the ones at the gate or they'll hit the gate). I've once seen the catapults wreak havoc and almost break up the first wave entirely. It's loads of fun. You will lose eventually, but you will kill anywhere from 3-6K of them before your last man dies.