 Complete the following phrase:  Computer wargames derived from tabletop wargames, which range from military wargaming to recreational wargaming. Wargames appeared on computers as early as Empire in 1972. The wargaming community saw the possibilities of computer gaming early and made attempts to break into the market, notably Avalon Hills Microcomputer Games line, which began in 1980 and covered a variety of topics, including adaptations of some of their wargames. In February 1980 Strategic Simulations, Inc. SSI was the first to sell a serious, professionally packaged computer wargame, Computer Bismarck, a turn-based game based on the 