Actually in my last game I didn't even get Ancient Ents. Nowhere in the world had them at all, same with Royal Thorns. Man I was annoyed. Still I probably wouldn't have used them with a warrior. A casting of teleport to get them into the fight instead of Dragon arrows or Mass Precision on the first round? No thanks hehe
I was going to try the all Elven army, but in the end I just couldn't resist using a mix of units ^^