In early 2009, Games Workshop also released an expansion to the original game called "War of the Ring" which, according to the company, allows players to emulate the large battles included in J. R. R. Tolkien's "The Lord of the Rings" by streamlining the game system. This expansion differs from the main game in several ways. Firstly, "War of the Ring" uses a larger number of models but the models are placed on movement trays with two cavalry models or eight infantry models on each. This allows for much easier and quicker movement of large numbers of models at once. These are called "companies". Larger creatures such as Ents and Trolls are treated as separate models and do not use movement trays. Combat within the game is also treated differently. In the original game players both roll dice to determine who wins the fight and then the victor rolls to see how much damage is done. In War of the Ring only dice to determine damage are rolled. Also, in "War of the Ring", heroes are treated more like upgrades for their company rather than individual models, as they are in the original game.