Have to agree with ransom. Attaching arrowheads to rockets is unworkable. They were aimed by the Chineese at general direction of something big. One cannot hit a man with such. They wre incendiary weapon mostly used in sieges or by ships and not in open battlefield and even in such limited use traditional catapults and trbuchets were rather more efective. And the poeple of middle earth clearly are already using gunpowder to do demolitions in sieges. But that is not so simple affair either.
Also It might be interresting to note that gunpowder is not the only requirement to inventing artillery and I think the people of ME might lack the other... I mean has anyone noted bronze being used there? Especially in large quantities? One can FORGE almost every practical tool they need and they had iron from the start. Unfortunatley casting iron is more complex then one might think and was invented suprisingly late. With the dawn of factory sized steelmills I'd say. Primitive cannonbarrels wall needs to be some two-three inch or so thick to contain the gunpowder explosion. They were historically casted. First of bronze, then at latter era of iron.
JH
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