There are many ancient armies, I will not explain them all here, here I will only compare a few large unified dynasties, and the following is mostly my personal opinion.
Qin——— Han——— Jin——— Sui——— Tang——— Song——— Yuan——— Ming, ——— Qing
Yuan dynasty
When you think of the Yuan Dynasty, you will think of its vast territory, you will think of Temujin, you will think of the noble golden family on the grassland, and you will think of its invincible military power.
Social atmosphere: I don't know much about the Yuan Dynasty, so let's just talk about the military strength of the Yuan Dynasty. To be honest, I don't think that the military strength of the Yuan Dynasty is very strong, and they can fight such a large territory, I can only say that the times favor them.
In the twilight of the Xia, Jin, and Song dynasties, when they were in the middle of their rivalry, the Mongol tribes led by Temujin had just unified the forces on the steppe, turning their entire Mongol tribes into a new power. One advantage of the emerging forces is that they will not engage in internal struggles too early, because their external benefits can feed them.
Then, Temujin led his golden family to military victories one after another, expanding its territory one after another. Another is that Temujin is very good at giving birth to sons, and training the next generation and the third generation, so that the Mongol tribe led by the Golden Family has been in a period of rising power for more than a hundred years (this is really terrifying).
Summary: It was Temujin and his golden family that led the Mongol tribes to achieve one military victory after another, making the vested interests of the Yuan Dynasty become like wolves to the distant social atmosphere.
Ming dynasty
When you mention the Ming Dynasty, you will think of the temperament image of Zhu Yuanzhang, the Hongwu Emperor who expelled the Tatars and restored China, as well as the tough guy who did not make peace, did not pay tribute, and did not cut the land. The peak of the Ming Dynasty's combat power was the early Ming Dynasty, and then the Ming Dynasty's combat power has been declining, and in the middle and late Ming Dynasty, that is, Qi Xuguang's Qi family army made some sounds, and then several armies in the late Ming Dynasty.
Social atmosphere: Since the Ming Dynasty was founded in the hands of the Hongwu Emperor Zhu Yuanzhang, and then to the Chongzhen Emperor and Beijing hanging in the coal mountain, there is a tough guy temperament in my bones that I can stand and die, but will never kneel to live. (Although there is a Daming war god Zhu Qizhen in the middle, our Daming Dynasty is generally good)
Although the emperors of our Ming Dynasty all have their own small hobbies, they are still good overall. As far as the emperors of the Ming Dynasty are concerned, their bones are hard.
Summary: I still like the Ming Dynasty very much, I think I have always been the Son of Heaven guarding the country, and the king died in the society; He appeared in front of me with the image of a tough guy temperament who did not get along, did not pay tribute, and did not cut the land. Since the Han and Tang Dynasties, I have just made me like it.
Qing dynasty
The mention of the Qing Dynasty reminds me of the Kang Qian prosperous era of Kangxi and Qianlong, and the divine drama "Huan Zhu Gege". Although the Qing Dynasty did not like it very much, it was still realistically said that the Qing Dynasty was the peak of imperial autocracy in Chinese history. The combat strength of the Qing Dynasty's army slowly slipped down in a curved line over time, and when the quality of the Eight Banner soldiers could not withstand it, the combat power fell sharply.
Social atmosphere: The Qing Dynasty fully absorbed the lessons of the destruction of foreign races in history, and issued five decrees, including shaving, changing clothes, enclosure, surrender, and escape. Take it for example, the shaving order is an important measure to strengthen the rule after the Qing Dynasty entered the customs, the implementation of the shaving order is to mentally suppress the Han people's idea of resistance, want the Han people to completely become the obedient people under the rule of the Qing Dynasty, and the Qing Dynasty's policy of ignorance is also the most thorough in history.
Since the Qing Dynasty entered the customs and ruled the land of China, the policy implemented has been feasible and successful, and it is an unprecedented victory for a family in history; But its implementation is unfortunate and painful for the Han nation, and it is the humiliating history of the modern era of nearly 100 years.
Summary: From the history of the Qing Dynasty, I can only see the pair of empty and godless eyes, and from this pair of empty and godless eyes comes the insensitivity to life.
Since most of my historical knowledge comes from historical novels, I have not systematically studied history, and I may have certain misunderstandings about history, I hope you will point it out.