I was just musing for a moment. It occurs to me that the Romans appeared to have a maximum number of legions they could raise at any one time. (This is probably true of other ancient civs as well). At the same time, they eventually found that there was a more or less ideal size of empire, corresponding roughly to Western Europe and the Mediterranean coast.
Now suppose that there was a maximum cap on the number of units you could field at any one time. It would mean that the bigger your empire got, the harder it would be to both conquer more territory AND maintain control of the empire you've already conquered with a sufficient garrison.
This could be a good simple method of halting the "steamroller" effect and prolonging the campaign challenge. In fact with an army cap, the game could actually get *harder* as you expand instead of easier, which is how a good game should really operate.
You could probably link it up with your finance in some way as well. As your empire expands, and your garrisons get diluted, corruption increases, and you begin to get a decreasing amount from each province. This could prevent you accumulating too much gold. At the same time, the wealth stolen through corruption could be used to fuel more rebellion, as the local leaders who stole it become more powerful and self-confident in their own right. So then you would have a mechanism for faction re-emergence, a la MTW.
It could also throw other aspects of the game into greater relief, such as the importance of maintaining good governors in major cities. Heck, you could even have family members defecting and trying to knock you off and become Caesar themselves...
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