Please people, yes his spelling is bad, but there’s no reason to be mocking about it.
As for the idea, well full-blown artillery, like leveling city blocks would be definitely overboard, but equip a semi-qualified NPC with a mortar and some rounds, and have your PC act as a spotter, might not be too overboard. Of course you better hope they’re accurate, heh.
The infrastructure for that kind of thing is a bit far off, but then again I’ve been surprised by how quickly things have been implemented before.