Chongzhen: This Warrior Can Build Buildings!

Traveling through the early years of Chongzhen, Chen Yan became a hungry little flag officer in Fengsui Fort, Liaodong. Facing the Houjin Iron Cavalry, he had no peerless martial arts, no system prompts, only a head full of modern military engineering knowledge and a pair of hands for building walls. When his colleagues were practicing horsemanship and archery hard, he was preparing a three-to-one cement ratio in front of the kiln; when the general was raising his servants, he was drawing puzzling five-pointed star drawings. "What's the use of building this weird wall? Why don't you train more servants!" Faced with the ridicule, Chen Yan patted the rough cement bricks: "According to ballistic calculation, the 30-degree slope can make the lead bullets ricochet, and the cross fire has zero blind spots. It is ten times cheaper than the servants." Under Ningyuan City, the concrete bastion resisted the red barbarian artillery; above the snowfield, three sections of line infantry attacked and defeated the Eight Banners' elite cavalry. From the small flag of the border army to the garrison of Guanning, from the governor of the island to the overlord of Nanyang, he used cement, gunpowder and ballistic calculation to build an iron-barrel empire. Don't talk to me about the art of war, I can only build walls - but this wall can stop thousands of troops! This is a hard-core story about how technology and engineering save the Ming Dynasty: no system, no palace fighting, all relying on cement proportions and firepower coverage!