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I'm talking about Kazimierz Siemienowicz.

This 17th century artillery officer and engineer was the very first in Europe to create the theory and schematics for military rockets, going as far as to create one of the first sketches of a multi-stage rocket. Siemienowicz worked in the army of the Netherlands in the last years of his life, and it's were he wrote the first part of Artis Magnae Artilleriae (The Great Art of Artillery).

The second part, which supposedly detailed the "universal pyrotechnic invention" that would ease all measurements and calculations in the field, was lost, rumored to have been taken down by gunsmith and metallurgy guilds. So yeah, the man also almost pioneered rocket science.

My question is this - what if Siemienowicz's inventions were adopted across Europe? What if we had military rockets, both useful in the battlefield and in sieges, flying across Europe in the 17th century? How would this change the subsequent history of the continent?
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