At the Beginning, I Was Chased by Qin Soldiers, so I Took Out the Laser Cannon

Bai Yu woke up from the interstellar escape capsule. In front of him was not a rescue ship, but the ancient Qin Dynasty forest! A group of Qin soldiers were massacring civilians. When they discovered him, they rushed towards him with their swords raised. At the critical moment of life and death, he took out a laser cannon from the escape cabin - the blue beam instantly penetrated the tree, and all the Qin soldiers knelt down and begged for mercy! "I... Traveled to the Qin Dynasty?" Bai Yu looked at the interstellar weapon in his hand and raised the corner of his mouth, "Since I'm here, let's play big!" Relying on the scientific and technological knowledge base of the river system civilization, he brought horseshoes, blast furnace steelmaking, gunpowder to Qin Shihuang... Each technology shocked the government and the public! When the Xiongnu's 100,000 cavalry marched south, the Qin army was equipped with the new firearms he made to fight; when the remnants of the Six Kingdoms jointly counterattacked, he personally went into battle, showing a terrifying physique that was twenty times more powerful than Xiang Yu's.