Tieliu: the Sixteen Taihang Kingdoms

Pei Ye, a modern military logistics officer, opened his eyes and returned to 397 AD. At the foothills of Taihang Mountain, the ruins of Shijing Village, the Xianbei cavalry has just left. Sixteen living people and half a bag of moldy corn were dug out of the ruins. Others travel through the system and bring space. Pei Ye only had a head on modern logistics - iron smelting, crossbow making, standardized mass production, and wartime material deployment. On the day when the first batch of iron came out of the blast furnace that had been abandoned for decades, the people in Zhaojiabao discovered that the "blacksmith's son" didn't look like a blacksmith with his eyes. The first crossbow machine, four versions of iterations, from the quenching of the blade and the oil tempering to the two inches of wood. In the first defensive battle, fifty Xianbei cavalry attacked in two groups - iron slag traps, horseshoe nests, and fifteen crossbows, and fought back. During the Taihang Four Village Alliance, he was promoted to be the general manager of the Donglu Crossbow Line. Then the news came: Twenty thousand riders from the nine Xianbei tribes were gathering to climb the Taihang Mountains in three months. Three months. Three abandoned kilns. Sixteen people were massacred and left to die. And a craft called "industry". Everyone thought he was guarding an iron mine. He is smelting an iron stream.