I Shocked the World by Developing a Steam Engine in Another World

Li Yu traveled to a different world with only iron technology. In this world, people relied on cold weapons to fight, and their movement relied on horses and carriages. As a result, Li Yu accidentally activated the sign-in system and obtained a steam engine? ! This other world is in the Iron Age. Let alone steam engines, there may not even be a few muskets, and there may not even be gunpowder! "Didi, on the first day of signing in, you have extracted a steam engine and coal refining technology, and have a system to dispatch system personnel to carry out refining, so you can carry out industrial technology." "Didi, sign in for one week. Congratulations on winning a coal mine. Click on the layout to expand the coal mine output." Li Yu quietly worked on it for a month, concentrating on its development. I found that I now have various basic technologies such as producing guns, cannons, and building factories. "Didi, we got a thousand guards and fifty thousand stones of food." My mother-in-law, can I still gain military strength? ! At this moment, Li Yu had a bold idea This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.