When the Qin Dynasty perished, why did 500,000 Qin Jun, who was sent to defend the border, lose its reputation?

When it comes to the establishment of the Qin Dynasty, the history we have learned is very auspicious. From its background and necessary conditions, we can see that many factors are necessary and the inevitable product of the development of an era. However, we may not know much about the demise of the Qin Dynasty, but you must have heard of Meng Tian, who was a big star of the Qin Dynasty. Does the final demise of the Qin Dynasty have anything to do with his failure to rescue him?

First of all, Qin Shihuang was an ambitious and far-sighted emperor. He ordered 500,000 Qin Jun to guard the border, because he knew the importance of a stable border to a country. Is it possible to guess that these troops were also ordered by the king of Qin and did not come to save them in the end?

On the other hand, Qin Shihuang is undoubtedly a legendary figure, but there is an old saying that "companions are like tigers". So from this perspective, will Meng Tian's decision to stay in the frontier during this period also have his personal feelings? Let's not talk about how Qin Shihuang made great achievements for the time being. Through some articles, we can see that war exists, and the running of soldiers is objective and unchangeable. The original text of this is not easy to analyze.

In addition, combined with the actual situation at that time, Qin was already the target of public criticism, because later Qin Shihuang pursued "immortality" and was addicted to seeking immortality, so that he was not so keen on political affairs, and even for talented and ambitious people, he was full of bad tricks. Maybe the sergeant is very sad about what he did later. I saw it, too. If this continues, it is the only way to destroy the country. We usually say that those who know the times are heroes. Whether a monarch who has no popular support and reduced combat effectiveness is worth guarding by these 500,000 people, I believe this is also the primary question that leading generals thought at that time.