That's why I think that Forstchen hit the technological sweet spot in The Lost Regiment by putting a Civil War era infantry regiment in medieval Russia. The soldiers had the know-how to make a smoothbore musket and cannons, and the Russians had the tools necessary to make the tools necessary to manufacture them.
William R. Forstchen had a somewhat similar premise in his Lost Regiment series.
I guess, in retrospect, Hollywood cannot be trusted with such a sacred mission.
Keep it for a guest that you hope will leave soon.