I've also been thinking about gunpowder. I know you don't want it in the game, but I'm going to push this anyways.
This is the Shingicheon Hwacha
http://img9.exs.cx/img9/7876/hwacha.jpg
It basically shoots arrows so it's not like cannon balls or anything. The way I see it, it's like a massive Firelance. Just a thought.
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