Here's a quick and dirty remake of my 'Springs of Arda' map. Your now in the middle of the crater of Osgiliath, and four enemies at the corners are gunning for you. Remember, height advantage works both ways on this one. Stick it to em'.
I put the difficulty on normal for this one, but like all skirmish maps, it depends on what enemies you choose and the computer gold advantage. Even at a normal advantage, one wolf, one Saladin, and two Lionhearts united gave me a 'run for the money' on the test run. They attacked almost instantly - I'd imagine 4000 gold advantage would be extremely hard, and 8000 would be impossible. Enjoy!