Civrules in post #66 made a correct point about an historical battle. The problem with trying to recreate something like that is that the game would have to go to a tactical battle system that would consume much of the design effort. What he describes in post #66 can be recreated in a game like "Rome Total War" for instance. I play that game. It often takes me 30 minutes to fight one complicated tactical battle. I like that, but it would be very time consuming for civ which covers a time period of 6000 years instead of just 274 years. You have to beware of successful game systems that reach too far -- like "Heroes of Might and Magic III" was great whereas Heroes IV stunk. The bottom line is this -- playtest, playtest, playtest! And don't release it until it works.