"Computer-assisted" simulations are really just a development of the manual simulation, and again there are different variants on the theme. Sometimes the computer assistance will be nothing more than a database to help umpires keep track of information during a manual simulation. At other times one or other of the teams might be replaced by a computer-simulated opponent (known as an "agent" or "automaton"). This can reduce the umpires' role to interpreter of the data produced by the agent, or remove the need for an umpire altogether. Most commercial wargames designed to run on computers (such as "Blitzkrieg", the "Total War" series, "Civilization" games, and even "Arma 2") fall into this category.