I've been doing a bit of research for my book because I want to use steam-powered cannons--or something equally simple for the same type of purpose-- for a battle. The small, scattered communities who live far away from the urban area have really limited resources when it comes to means for sophisticated military defense, so wouldn't have anything too complex, and steam cannons seem pretty simple (by contrast, the urban region has all sorts of high tech futuristic modern stuff, especially for Orwellian purposes). I did a bit of research and found that they were tried at one point in history, but didn't work well. Can anyone who knows about science explain why they wouldn't have worked, and how they might have been altered to work better? It doesn't HAVE to be steam-cannons per sae, but like I said, the people using them have limited military technology, although are savvy at things like digging wells and making other types of weapons...so I doubt they'd have the means to make a bomb or anything...(plus I'm too paranoid to type "how to make a bomb" in Google, I don't want the feds storming my house ) Any tips? Haha I don't know much about weaponry of this kind, but would like to.