There are four opponents on this map: Huns (red, Hittites), Hunnish Allies (yellow, Hittites), Hunnish Allies (brown, Palmyrans), and Goths (orange, Persians). Build up your base, and build some defenses. The Huns start off as allies, and will be demanding tribute to remain that way. Don't pay them; you'll have to destroy every last one of their units and buildings, and every bit of gold you give them will only strengthen them. When they declare you an enemy, do the same.