Tactics for the Swamp (Fortress).

I'm playing as Fortress, and I'm getting completely wrecked. Fortress is only good for taking out neutral creatures. The army isn't suitable for real battles because the only effective units are Hydras (they attack in a circle and can't be countered). All the other units are too slow, and by the time they reach the enemy, they can be Berserked and shot down. IMHO. Indeed, due to the lack of real ranged units (lizards are weak), it's very difficult to fight without taking losses.