500,000 immigrants from Zhao Tuo.

When the Qin Dynasty was destroyed, Zhao Tuo had 500,000 troops in his hand, but he didn't go north to save him from troubled times. This is also a mystery in history. I think Zhao Tuo didn't go back to the north from Lingnan with a large army at that time, because he wanted to stand on his own feet in Lingnan and stop going to war in troubled times and make the people displaced.

Zhao Tuo was quite famous before the first emperor unified the six countries, and was deeply loved by the first emperor. After pacifying the Central Plains, Qin Shihuang first arranged for General Meng Tian to lead 300,000 soldiers northward to resist foreign invasion and build the Great Wall to resist the Huns. After Qin Shihuang, Zhao Tuo and others were sent south to recover Lingnan. After four years of hard struggle under the leadership of Ren Tao, Lingnan finally returned to the Daqin Empire, and the king of Qin ordered them to station troops to manage one side.

After the death of Qin Shihuang, the Qin Dynasty fell into the hands of Qin Ershi Hu Hai. Because Hu Hai listened to the slanderers of eunuchs and had no ability to govern the world, the Daqin Empire established by Qin Shihuang collapsed instantly, and people from all sides revolted against Hu Hai. At that time, there were countless generals in the history of Qin, and Zhao Tuo was just one of them. Take Meng Tian brothers and others, for example. Their talents and Qin Shihuang's trust are above Zhao Tuo, and those good ministers and soldiers didn't save Hu Hai.

Later, when the monarch of the South China Sea was seriously ill, she called Zhao Tuo and explained to him the advantages of relying on Lingnan, which was easy to defend but difficult to attack. If the country is founded in Lingnan, it is also a desirable thing to resist the invasion of various armies and keep the people safe during the chaotic period in the Central Plains. Finally, Zhao Tuo accepted the suggestion, instead of saving Hu Hai, he founded his country in Lingnan.