The ancestors of the Qin state were the right-hand men of Zhen Shou Xi Rong during the Yin Shang period, and later Qin Xianggong led troops to save Zhou Yougong, so he was appreciated by the King of Zhou Ping, and since then the tribe has become a princely state, and no one will expect that the Qin state, which became a princely state at the latest, would come to the top, and successively dominated in the Spring and Autumn Period and the Warring States Period.
During the Spring and Autumn Period, after Qin Mugong's plan to infiltrate the Central Plains was destroyed by the State of Jin, Duke Mu of Qin resolutely adjusted the national policy, successively destroyed the 12 countries established by the Rong people in the West, opened up more than a thousand miles of land, and stabilized the rear area, which was originally defeated by the State of Jin, and now after washing away the shame, the State of Jin ceded the eight cities of Hexi to the State of Qin, and sent the prince to the State of Qin as a hostage, which laid the foundation for the future State of Qin to become the four great powers of the Spring and Autumn Period.
Unfortunately, the successive kings of Qin were uneven in their governance, unable to keep the Qin state developing, coupled with the chaos and turmoil of the situation, the Qin state failed to maintain its hegemonic position in the Spring and Autumn Period, and in the Warring States period, the rapidly rising Wei state was like a bamboo, attacking the Qin state for many years, encroaching on the West River of Qin, peeping into Guanzhong, Qin Huigong with 500,000 troops and 50,000 Wei troops fought to the death, and the result was a big defeat, since then the Qin state was seriously injured, unable to resist the attack of the Three Jins, and forced to retreat west of Luoshui.
Unfortunately, there were contradictions within the Three Jins, the Zhao and Wei states turned against each other, the alliance collapsed, the Qin state had a chance to breathe, and after Qin Xiangong took the throne, he developed the strength of the army and began to defeat the Wei state. The State of Qin was successively defeated by the Jin and Wei states, but the State of Qin did not collapse, but concentrated on developing and taking revenge.
After Qin Xiaogong succeeded to the throne, he also had Shang Martin as his right-hand man, and the two of them worked together to change the law and launched a series of policies on various aspects, especially in the military aspect, the people of the whole country were proud of the country's military achievements, so the overall combat effectiveness of the country increased rapidly, and the military strength of the Qin state did not fall behind in many countries, and eventually became the strongest country in the middle and late Warring States period, but success was always accompanied by huge risks, and what followed was the other six countries' "combined vertical" policy against the Qin state.
Under the efforts of successive Qin kings and courtiers, the Qin state stood firm, and the strength of the other six countries was weakened and weakened, until after the Qin king took the throne, he was an outstanding politician, strategist, and reformer, and there were li si, Bai Qi, Wang Feng and many other capable people under his command, and the army was brave and good at war, invincible, and frightening, and the Qin state destroyed the six kingdoms in only ten years and established the first great unified dynasty in Chinese history, the Qin Dynasty. But why did the Qin Dynasty, which had a strong military strength as the cornerstone, be overthrown by the peasant rebel army within a few decades?
After Qin unified the Six Kingdoms, Qin Shi Huang sent Meng Tian to lead 300,000 troops north to fight the Xiongnu, Meng Tian achieved good results, recovered lost land, managed the border area, and was later sent by Qin Shi Huang to supervise the construction of the Great Wall. After the death of Qin Shi Huang, Zhao Gao supported Hu Hai to the throne, and the prince Fu Su was killed, Meng Tian had doubts in his heart, he was Fu Su's subordinate, and now Zhao Gao and Hu Hai were in cahoots, and Meng Tian, who had a heavy army, was not accustomed to these two people, and soon he was also murdered. When the Qin Dynasty was in danger, the Qin army loyal to Meng Tian did not move and did not go to Xianyang to provide timely support, resulting in the Chu army successfully invading Xianyang.
In fact, not only these more than 300,000 troops did not play a role, the original 500,000 troops of the Qin state were sent to the south, in 219 BC, Qin Shi Huang sent Zhao Tuo as a deputy general to lead 500,000 troops to pacify Lingnan, Zhao Tuo with 500,000 troops to pacify Baiyue, where he established Xiang County, Nanhai County, Guilin County and other places, after which the Qin army gained a firm foothold in the south. Qin Shi Huang also issued an edict that no matter what happened in the Central Plains, the army was not allowed to go north, and they could intermarry with the locals and take root, but they could not return to the Central Plains.
Qin Shi Huang issued this death order, he never expected the Qin Dynasty to be so short-lived, even if the Qin Dynasty later summoned them back to the Central Plains, they also refused the imperial order, because these armies have formed a divided regime in the south, the rulers have their own ambitions and plans, they naturally will not come to the Central Plains to swim in muddy waters. Moreover, even if they came to support the Qin Dynasty, these 500,000 troops had long lost the prestige of destroying the Six Kingdoms in those years, and Qin Shi Huang sent 300,000 elite Qin troops to fight against the Xiongnu, but the southern conquest of Baiyue was a miscellaneous army, mixed with militia, slaves, and other soldiers, but the 500,000 troops were enough to pacify Baiyue, and their main task was to use as a reserve army to reclaim wasteland in the south and expand the territory of the Qin Dynasty.
From the far south to the remote north, a long journey along the way, but still can not catch up with the unpredictable situation in the Central Plains, in 209 BC, Chen Sheng Wu Guang set off a peasant uprising, in 208 BC, the Battle of Julu broke out, after a year of war, the main force of the Qin army was also wiped out, in 207 BC, Liu Bang invaded Xianyang, the Qin state perished. If they want to be supported by half a million troops in the south, I am afraid that the march will reach the halfway point, the situation under the world has been determined, where should they go, should they go north to restore the country, or return to the local area?
I am afraid that as soon as they leave the garrison, the Qin army will lose control of the local area, all the efforts they made in the past will be in vain, they will not be able to go back, and in the Central Plains, there are powerful Western Chu overlord Xiang Yu and Han king Liu Bang, as well as the army that has fought in blood, can these rabble-rousers who have not experienced war for many years really win? I'm afraid there's no hope at all.