Traveling through the Five Dynasties and Ten Kingdoms, Yun Fei, a doctor of science, wanted to save his life, but found that there was no way to survive in troubled times.
In this case, he had no choice but to use his knowledge to overturn the table!
Enemy cavalry charge? I used parabola to teach him how to be a human being.
A fortified city? My basic chemistry can blow it to the sky.
The warlords from all sides laughed at me for being of low origin and not understanding the art of war.
Until they saw my troops forming a calculus square formation, using standardized and assembly-line weapons, pushing aerodynamic siege engines...
This is not a war, this is the dimensionality reduction attack of "Principles of Engineering" on the cold weapon era!
