Actually trebuchets, catapults and air cannons are something you may see in various places, especially in the UK and the US. The US has a very active "pumpkin chucker" competition - and those kind of machines would make very formidable weapons lobbing explosives or projectiles.
And the UK has a pretty big group of re-enactors who build things like replica catapults, trebuchets and Roman ballistas.
And a trebuchet can throw quite a load - i.e. going to die pretty quick being under where the Volkswagen Bug that gets thrown into the town you are trying to defend lands
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