At that time, the great events of Qi expanded and the state was militaristic. Although the Song Dynasty was temporarily defeated, it intensified the internal contradictions of Qi, and at the same time aroused the dissatisfaction and fear of other vassal states. The defeat of Qi has already appeared. In view of this situation, the strategic situation between Qi and Yan was analyzed in time, and the strategic policy of turning weakness into strength and then defeating Qi was put forward, that is, to strive for joint invasion with the state and unite with the princes, so as to "take the world as an example". Yan Zhaowang adopted its suggestion, actively carried out the "cutting the cross" activity, achieved the expected ideal effect, and soon formed a pattern of joint attack. Not only did Zhao, Han and Wei agree to send troops, but even Qin participated in it with the purpose of being weak and trying to dominate. In this way, Qi is not only politically isolated, but also completely at a disadvantage militarily.
When Le Yi saw that the time for cutting Qi was basically ripe, he decided to authorize Yan Zhaowang to attack Qi. In 284 BC, Le Yi joined forces with Zhao, Qin, Wei and Korea. With the rank of General Yan, accompanied by Pei Zhao, he commanded the five-nation allied forces to go hand in hand. Le Yi knew the significance of winning the first battle to dominate the overall situation of the war, and gave the enemy a surprise attack based on pre-emptive. According to this guiding ideology, Le Yi commanded the five-nation allied forces to launch the war of aiding the West in time, and broke the main force of the Qi army led by the commander-in-chief of the Qi army in Shuixi. After the victory of the Battle of Jixi, Le Yi, in view of the fact that the main force of the Qi army had been eliminated at that time, it was difficult to organize effective resistance, resolutely repatriated the Qin Na army, and sent Wei Jun to capture the hometown of Song and Zhao to capture Hejian, so as not to let other countries continue to share the fruits of the victory of cutting Qi. Later, he directed the main force of the Yan army to March into Linzi, the capital of Qi, in response to the fear that the main force of Qi was empty and the whole army was wiped out, which once again showed his military talent of sizing up the situation and being resourceful.
The strategic deployment was once opposed by the counselor's drama Xin. The drama thinks that Qi is big, Yan is small, and the army of Yan should seize the frontier towns of Qi to expand and develop itself, so as to make long-term plans, instead of taking risks to send troops. Le Yi believes that Yan Jun must move forward and occupy the capital of Qi, otherwise it will delay the fighters and undermine the victory. So he denied Xin's view of drama. Command the Yan army to pursue strategically and conquer Linzi. Thus destroying the command center of the Qi army. After conquering Linzi, Le Yi made a battle plan to conquer Qi according to the development of the war situation. The specific measures are to divide the troops into five roads in time to capture and pacify the whole territory. Among them, Zuo Jun Du Dong Jiaojiao, Kejiaodong and Donglai; The right army along the Yellow River and Jishui to Xike Acheng and Juancheng; The former army went to the Yellow Sea along the eastern foot of Mount Tai and took Lang Jie; After the army occupied Qiancheng on the northeast coast of Linzi; Zhong Jun guarded the capital of Qilinzi and coordinated various ways. The operation of the Fifth Route Army went smoothly. In just half a year, more than 70 cities in the State of Qi have been linked together, making the State of Qi almost on the verge of national subjugation. At this point, the strategic goal of the Yan Army has basically been achieved. As a generation of famous soldiers, Le Yi is also famous all over the world, making the enemy fearful.
Le Yi is not only an outstanding military commander, but also a sober politician. He is fully aware of the decisive role of people's hearts in winning or losing a war, and is good at properly handling the relationship between military and political strikes, so as to achieve twice the result with half the effort. In the war of cutting Qi, Le Yi attached great importance to winning people's hearts while resolutely carrying out military strikes. For example, after Le Yi conquered the capital of Qi, he paid attention to restraining soldiers, strictly observing military discipline and prohibiting soldiers from looting; Respect local customs, abolish the tyranny of the king and reduce the tax burden of the people. At the same time, he also used official titles and fiefs to win the support of a considerable number of landlords, nobles and celebrities in Qi State, and personally went to Qi Huangong and the Guandi Temple in the suburbs of Linzi to worship, winning the favor of many Qi people. All these have effectively ensured the smooth progress of military activities and fully demonstrated Le Yi's general demeanor of being both civil and military, intelligent and brave.
Of course, the exertion of any famous military genius is restricted by various conditions, and Le Yi is no exception in this respect. In the last stage of the war of cutting Qi, he met with great difficulties. He is an officer of Tiki, who fought back and forth for five years. Basically, the land was settled, only Gong and Jimo held it, and they could not capture it for a long time. In this case, Le Yi had to abandon the practice of attacking the city by force, and changed from political "attacking the heart" to military siege. To this end, he retreated the besieged troops to camp 9 miles away from the two cities, and stipulated that the Yan army would not catch Qi Min who fled the city. If Qi Min finds it difficult to make a living, he will give relief. He hoped that through these actions, his opponent's resistance would be disintegrated, and the defenders of Ju 'an and Jimo would lay down their arms and surrender. It should be said that Le Yi's policy was a feasible choice at that time.
However, at the most delicate juncture of the war, the strict domestic situation has undergone tremendous changes. Yan Zhaowang, who had always trusted and supported Le Yi, died suddenly at this time, and his son Yan Hui succeeded to the throne. The new monarch, when he was a prince, had problems with Le Yi. At this time, when he saw Le Yi attacking Gonggong and Jimo for a long time, he had deep doubts about Le Yi. Qi Jiang Tian Chan skillfully took advantage of these situations, sent spies to Yan State to spread rumors, vilified Le Yi, and used double spies. The fatuous Yan believed it and sent a rider to the front instead of Le Yi. Forced to surrender the military power and escape from Zhao. Tian Dan seized the opportunity; Swing a fire cow, break the main force of Yan army, and recover more than 70 seats in Qi City. In this way, the great cause of extermination unfortunately fell through! Spent his later years in Zhao. There, he was welcomed by King Hui of Zhao, and in 282 BC, he led the Zhao army to attack Wei and captured Bo Yang. Later, Yan Hui Wang also regretted his wrong decision at that time, and wrote to Le Yi, inviting him to return to Yan, but Le Yi politely declined. Ruthless years passed, dyed the sideburns of Bai Rushuang's generation of famous stars, and Le Yi finally died. With the hidden pain and melancholy of unfinished business, he came to the end of his life journey alone.