I don't know how practical this is, but I always thought that it would be really cool to do a group battle: you could set up a good historical battle on an overhead projector and divide your class into teams, selecting generals, centurions etc etc and then play hotseat or mulitplayer. The general would have to give orders to his officers who would execute them by manipulating only the units they are supposed to be in control of.
You as the teacher could pause the game from time to time for a talking point. You could even have someone betray their general and defect to the other side!
Back in the day, I had a teacher do something like that with Squad Leader (god, what a great game that was): there were about 14 of us in an after school history club. We also dressed in period uniform while playing. No girls, though.
Also I thought you might be interested in this.
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