This is a five player map, and while the rest of the palayers start out in camps, one of the players starts out in the middle of the map, within Isengard, in control of the Orthanc Tower and the impregnable walls surrounding it. While the player in the middle fortress can pick any faction, an Isengard player can house Saruman atop the Orthanc, which functions as a beefed-up wizard tower that grants Saruman's tower abilities dramatically increased range and area-of-effect.
The ring or walls surrounding the Orthanc Tower don't have any build plots, so they cannot be fitted with defenses. However, both the ring of walls and the tower itself are super tough with a high armor rating and enormous health pools. The ring of walls can be platforms for ballistae and other soldiers to stand on, and the Tower of Orthanc can also activate an ability called “Forge Bellows,” which ignites everything around the tower in flames, much like they did in the book. The ring of walls also has only one gate, being the entrance and exit.
There is a massive river dam on the edge of the map that lies undefended. If a player should destroy that dam, the massive flood will be enough to destroy Isengard's walls and smother the units within to heavily damage both their units and buildings.