You Promised to Write a Book to Popularize Science, but Why Did You Actually Rebel?

The protagonist is a college student who is keen on popularizing science about ancient survival skills. He earns pocket money by serializing the "Travel Guide" online. Unexpectedly, the prophecy came true, and he actually traveled to a troubled time similar to the late Southern Song Dynasty, and became a cannon fodder recruit in a border town, facing a cruel battlefield like a meat grinder. In order to survive, he turned the "Travel Guide" in his mind into reality. While training under the veterans, he used modern physics and military industry knowledge to create a super-era killer "compound bow" from local materials, and worked hard to practice the military sword technique of killing with one hit. Starting from improving the logistics of the frontier army, he gradually climbed up the technology tree and reduced the dimensionality to attack the alien cavalry. When the alien army came to the city and the imperial court was preparing to cede territory for peace, the former frontier soldier had already raised an invincible iron army equipped with era-defining firearms and sophisticated cold weapons. Let's see how he uses modern wisdom to reshape the backbone of the Han family!