To the earlier discussion, trolls have a hard time getting to the archers, while cavalry can rush them over quickly, but this is pretty balanced in game i think, so this i dont have much of a problem with, except that trolls are a little expensive, they could have more hp
but my main issue between the two fortresses, is the size of the Dol Guldur orcs and they seem to e weaker, and that the spell call the horde doesnt work on Dol Guldur, so i just hope this gets fixed^^