This Scenario is by no means easy, but if you have the troops then it's certainly a lot less difficult.

The difficulty comes mainly with the Dragoon. They're horsemen with very high attack, and will ride over pretty much anything you have. Because of this, you'll need Phalanx - heavily armoured pikemen - to stop them. Either that or archers of some sort. I had two groups with Phalanx occupying the top two positions, and the rest below. They'll only need Pikemen or archers to get rid of the rest.

Don't worry about the Sorcerers. Their archers rarely cause any damage, and neither does their magic. A few archers to the south to take care of the Hawk Knight that appears would be helpful. Omega isn't too tough - again, if you need to, use archers to wipe him and his warriors out.