The Qin State’s battle to regain Hexi was completed in 36 years from 366 BC to 330 BC. When the Qin State was captured by the Wei State in the Hexi region, Qin Xiaogong was looking for talents who could make Qin strong, and Shang Yang was one of Qin Xiaogong's choices. After Shang Yang came to Qin, he carried out reforms and governance throughout the country with the support of Qin Xiaogong.

However, when Shang Yang implemented the new law, he inevitably touched the interests of the aristocrats of the old Qin state, so he encountered great obstacles on the way to reform. But fortunately, Qin Xiaogong insisted on Shang Yang's position and never changed. In the end, this allowed Shang Yang's reform to proceed smoothly. As for the artistic interpretation, you can watch the first step of "The Qin Empire". This TV series tells the story of Shang Yang's reform process.

After Shang Yang’s reform, Qin’s national power was greatly strengthened. In 354 BC, when Zhao State attacked Wei State, Qin Xiaogong took advantage of this time to launch a sneak attack on Wei State. And occupied Shaoliang. This victory was a good start for the subsequent recovery of the land west of Hexi. Shang Yang also showed his military talents in this war. After Shang Yang's death, Gongsun Yan was appointed as Daliang Zao by King Qin Huiwen and continued the war to regain Hexi. At that time, Wei's national power was no longer what it used to be. Faced with the strength of the Qin army, Wei could only cede territory and seek peace. Later, Wei even ceded the Hexi region.

After that, the Qin State reoccupied the Hexi area and regained the opportunity to march into the Central Plains. The Qin, Wei, and Hexi battles this time also ended with Qin completely controlling Hexi, an important road in the Central Plains.