In 330 BC, Gongsun Yan of the Qin state of Daliang broke the Wei army at Jiaoyin (in present-day southern Ganquan County, Shaanxi), and Wei gave Qin the land west of Hexi. In 329 BC, the Qin army attacked Wei and took Fenyang (present-day southwestern Wanrong County, Shanxi) Pishi (present-day Hejin County, Shanxi) and Jiao (southwest of present-day Sanmenxia, Henan) and Quwo (southwest of present-day Sanmenxia, Henan) in hedong. The following year, the Qin army took advantage of the victory to attack Wei and take Wei Puyang (魏蒲陽, in modern Yi County, Shanxi). Under several powerful offensives by the Qin army, the State of Wei was forced to cede 15 counties of Shangjun (上郡; present-day northeastern Shaanxi) to Qin.
King Huiwen of Qin appointed Gongsun Yan of Wei as the general to retake Hexi
In 318 BC, Gongsun Yan of Wei joined forces with the five kingdoms of Zhao, Yan, Han, Chu, and Wei to jointly cut down Qin. The five kingdoms jointly promoted king Huai of Chu as the leader of the column, and for the first time, each country had different intentions, Yan and Chu had a negative attitude towards Qin, and the state of Qi sat in the back and watched the tiger fight in order to take advantage of the fire and robbery. In addition to the three kingdoms of Wei, Zhao, and Han having a direct border with the Qin state, the Five Kingdoms of Qin actually only had the Three Jins contributing. This time, the combined forces of Qin arrived at Hangu Pass and were repelled by the Qin army.
Break the first five kingdoms joint attack on Qin
Sima Cuo and Zhang Yi led their armies from Jinniu Road into the territory, defeated the Shu army at Yemeng Pass, and occupied the land of Bashu
In 314 BC, after the victory of the Qin state in the central plains battlefield, it immediately mobilized heavy troops to attack Yiqu from the east, west and south, and successively captured 25 cities, thus weakening the threat of Yiqu to the Qin state.
Sweep the righteous canal
In 312 BC, King Huai of Chu was greatly annoyed after being fooled by Zhang Yi with the land of six miles. King Huai of Chu decided to send an army to attack the State of Qin, and the Chu army marched north along the Han river and Danshui in an attempt to use force to seize 600 miles of land in Shang. King Huiwen of Qin sent the general Wei Zhang (魏章) and the general Li Li (樗里樗) to lead an army out of Wuguan to engage the Chu general Qu Zhao (gai) in a fierce battle north of Danshui. In this battle, the Chu army was defeated, and the Qin army occupied Hanzhong.
Zhan Hanzhong became the link between Guanzhong and Bashu