Traveling back in time and becoming a minor official in the Qin Dynasty, Lin Qian opened his eyes to see a night attack by the Xiongnu from the grassland, and the county was in danger. The civil and military officials in the hall were helpless, but he was tied to a high platform as a sacrifice! The enemy army laughed wildly and wanted to massacre the city. At the critical moment, Lin Qian raised his hand and pointed to the quagmire outside the city: "There is steel there." - No one knew that he had a complete set of modern materials, mechanics, and overall knowledge in his mind. Three days later, when the Huns' cavalry broke through the city gate, they were greeted by a concrete wall. On the day when the defender's crossbow shot through the chief's flag, Xianyang's envoy rushed over: "Your Majesty wants to see you!" Lin Qian patted the soil and looked into the depths of the grassland: "Don't worry, I'll install a steam engine first, and then we'll talk about the counterattack."
