FenrysWulf
Evil Norse Wolf
Usually when I capture artillery I just disband it to contribute to the improvement in that captured city. I actually found a real use for it though. You know how a nation will declare war on you, and then suddenly 500 ships show up on your coast, bombarding everything to hell? Well, if you haven't been building a navy, this can be a huge problem. I found, however, that if you shoot those ships with artillery, they will retreat to their cities to re-heal. They tend to get stacked up too, so you can damage a bunch at once. This is a great way to relieve the pressure until you can build up your navy, and then when you do there's a bunch of weak targets out there.