After King Xiao of Qin succeeded to the throne, in order to continue the reform cause of his father Qin Xiangong, he recruited talents. Unexpectedly, this time it recruited the martingale. As a result, Shang Martingale began a series of variations (the story of shang martingale transformation method must have been heard by everyone, and I will not repeat it here). In the end, after the change of the Law of the Shang Martingale, the national strength of the Qin State flourished. Unfortunately, Shang Martin's ending was not good, and he was split and killed by the car after the death of Qin Xiaogong. Fortunately, the content of the martingale's variation was not abolished.
As for why Qin Shi Huang adopted the strategy of "attacking from afar and attacking closely," this has to start with Fan Ju meeting With King Qin Zhao, who admired Fan Ju very much and humbly asked Fan Ju for advice, and Fan Ju saw that King Qin Zhao was so sincere, so he offered his strategy of "long-distance friendship and close attack" to King Qin Zhao, and made a detailed interpretation -- Fan Sui proposed to make Han Wei the object of the qin state's first annexation, and at the same time to make friends with the state of Qi and establish good relations, with the purpose of preventing the state of Qi from being co-opted by other countries.
King Qin Zhao used Fan Ju as his counterpart, and it was Fan Ju's strategy to attack from afar and close in. Thus "the inch is the king's inch, and the ruler is the king's ruler." It is mainly used to destroy the six countries. Han Zhao Wei was a split from the Jin Dynasty, relatively weak in strength, small in territory, and close to the Qin state. Easy to conquer. Qi and Chu have a vast territory and a large number of soldiers, and it is not easy to attack, and it is time-consuming and laborious, and it is necessary to detour through Han wei to attack Qi. Therefore, by attacking Han Wei first, he could not only expand his territory, but also increase his military strength.
To put it simply, the long-distance and close-range attack was a national policy proposed by Fan Ju during the reign of King Zhao of Qin, in order for the Qin state to attack the Three Jins and thus not be restrained by Qi Yan, breaking the joint strategy of the other six kingdoms. This national policy was thus continued to be implemented until the Qin unified the Six Kingdoms.