Ah, that's it. Didn't know you could create an army out of Catapults.
Again, that might sound stupid, but I had support from my Galleon, and the boat didn't attack. That's normal, right? It's only bonus, right?
Armies of catapults are pretty much the basic offensive force in this game for at least half of its playtime. Combine a spy or naval support with a veteran catapult army, and you can pretty much take any city until the arrival of the gundpowder.
Naval support is awesome, but you only have to station your galleon on a square adjacent to the city that you are attacking. That is, naval units can only attack and destroy another sea units, but they can help your ground units both to attack and defend theirselves just by being near to them. I have been able to take rifleman defended cities just with catapults just because they were supported by a fleet of battleships (and yep, you can combine naval unit into fleets in the same way that you can combine ground units into armies).
I guess I need to be more selective in my aggression. My goal is always to take ALL the barb cities, because that means the AI doesn't get the benefit from them. The +50% trade from captured cities does sound pretty godly too, though I've never really got to capitalize off of it. It doesn't seem to apply to cities captured from the barbs?
Nope, cities from the barbs "join" your civilization instead of being captured. And yep, the 50% trade bonus is godly for the beggining of the game, while the mountain production is awesome for the mid - late game. Mongols are a bit deceptive because one would think that their keshiks would be their best asset, but no.
I'll be giving them another shot sooner or later, but now I'm up to deity and that's a scary thought.
Good luck on deity, you will need it. Try with the Romans or the Aztecs, some of the best civs out there!
And yup, the "ending reward" of civ rev is a bit tad lame. I would love to see random and interesting data about the glorious civ that I built (life expectancy, GDP, most awesome cities, etc), in the same vein that Civ4 did.