Bombardment requirement?

[Hukuma]

Is there a technology required before your catapults can bombard cities? I keep looking and not seeing one, but I can't bombard in my game, and it's happened before. What am I missing?

 

[Vizzini]

Does the city actually have a defensive bonus of some kind that your catapults can attack? The option won't be presented if the target city is already down to zero defense.

 

[Magnus Maximus]

And sadly you can not use your catapults for anything else besides decreasing a cities defenses. Or flat out attacking with a catapult. Which, even in a stack, tends to mean the end of the catapult...from my experiences.
I used to love leveling improvements and attacking approching units with artillary (like you would do in reality). Oh well, at least you can still use your aircraft to attack units!

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[Hukuma]

Oh, right, thanks. I was assuming the bonuses it listed under "city bonus" were bombardable, but the city didn't have the little fortress with a percent.

Thanks again!