I've had anything from 1 warrior/chariot per city at the end of game, to literally hundreds of modern units.
In general I will run as little defence as I can get away with when at peace and try to avoid sneak attacks through diplomacy. This depends on which AI personalities are in the game. If someone like Alex is in it's usually best to have at least the Heroic Epic city producing troops more or less the whole game.
Once astronomy is discovered on a continents map it's usually a good idea to have mobile stacks positioned around the empire in position to intercept landings. Railroads are excellent for this purpose.
In general I will run as little defence as I can get away with when at peace and try to avoid sneak attacks through diplomacy. This depends on which AI personalities are in the game. If someone like Alex is in it's usually best to have at least the Heroic Epic city producing troops more or less the whole game.
Once astronomy is discovered on a continents map it's usually a good idea to have mobile stacks positioned around the empire in position to intercept landings. Railroads are excellent for this purpose.
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