This map represents some history from "The Silmarillion". The map is designed to be played as an attacker. I suggest the map to be played on normal. On hard or very hard the map is good to be played after the player has some experience with lower levels of difficulty.
In the map there are no trebuchets and siege towers to be build. I think it is more real and interesting to play sometimes without trebuchets. Using trebuchets it is too easy to destroy enemy buildings from long distance without any victims.