In the first year of King Jing of Zhou Dynasty (544 BC), the captured prisoners of war stabbed Yu when Wu invaded Vietnam. In the tenth year of the Zhou Dynasty (the first 5 10 year), before Wu attacked Chu on a large scale, in order to relieve worries, it once attacked Yue and occupied Li (now south of Jiaxing, Zhejiang). In fifteen years, when Wu Jun's main force was in Ying and Chu, the more he took the opportunity to occupy the territory of Wu, the contradictions between the two sides intensified. If Wu wants to dominate the Central Plains, it must first conquer the State of Yue to remove the threat from the rear. The more you want to go north into the Central Plains, the more you have to obey Wu, which led to the wuyue War that lasted for more than 20 years. Wuyue is located in a water town in the south of the Yangtze River, where "the boat is a car and the horse is a horse" (Biography of Yue Jue Ji Shu), and both sides fight on water. At this time, as the "boat division" of the water army, it has become a new arm and can independently complete strategic and campaign tasks. There are three main types of warships of wuyue Navy, namely, warships (command ships), large wings, medium wings and small wings, as well as warships such as native cats (bows with sharp angles) and bridge ships (light warships). The main warship has a wingspan of 20 meters and a width of 2.7 meters, carrying "26 soldiers, 50 men (hands), three men (hands), one man (each with a long hook, spear and axe), one officer, one servant and one gunner", together with the captain "9 1 man". The basic way of water warfare is to shoot with crossbows first, then dock, and finally board the ship to fight, sometimes hitting enemy ships with sudden bursts.

In the 24th year (496 BC), He Lv, the king of Wu, led an army to attack Vietnam, and both sides were mainly against Li. The more he committed suicide, he took advantage of Wu Jun's distraction, launched a storm, defeated Wu Jun, and He Lu was injured and died. Fu Cha succeeded him as king. In twenty-six years, the more the water army attacked Wu, the more it fell (now Dongting Mountain in Taihu Lake, Jiangsu Province). When the Vietnamese army was defeated, the main force was wiped out. Wu Jun pursued the attack and occupied Du Yue (now Shaoxing, Zhejiang). More than 5,000 people led by Gou Jian, King of Yue, were surrounded on Huiji Mountain. Gou Jian asked him to surrender, but was persuaded by Minister Wu, saying, "If you don't destroy Yue today, you will regret it later.". Fu Cha, eager to dominate the Central Plains in the north, did not adopt Wu Zixu's suggestion and proposed withdrawing troops on the condition that the king of Yue was the king of Wu (see the article "The Battle of Fujiao"). Mr. and Mrs. Gou Jian worked for the prince of Wu for three years, won the trust of Fu Cha, and were released back to China. In order to prosper, Gou Jian destroyed Wu, "tried his best" and worked hard to be strong. With the help of counselors Wen Zi and Fan Li, he formulated the long-term strategy of "ten-year reunion" and "ten-year lessons": to implement policies such as developing production, rewarding childbearing and respecting talents internally, so as to stabilize people's livelihood, enrich the source of soldiers, win the hearts of the people, consolidate unity, and thus enhance comprehensive national strength; Militarily, the policy of elite soldiers should be implemented, training should be strengthened, discipline should be strict, and combat effectiveness should be improved. At that time, the war was fought with a crossbow. Chariots and warships are "the end of the war", and the key to a battle depends on the final charge. Gou Jian hired Professor Chen Yin, who is good at crossbow shooting, to use crossbow skills, including aiming, repeating and mastering the best ratio of crossbow force to arrow weight (pulling a stone, the arrow weighs one or two), so that "all sergeants can use crossbow skills", and also hired Professor Yue Nv, who is good at "Sword and halberd skills", to use "hand-to-hand combat skills" to make sergeants "one person is a hundred, and one million people are ten thousand". The folk custom of crossing the border is that "soldiers dare to die" and are used to fighting alone. To this end, Gou Jian opposed "men are men of courage", emphasized discipline, and asked the combat troops to unify their operations under unified orders and give full play to their overall combat capability. It is stipulated that those who obey orders will be rewarded, and those who violate them will be beheaded and separated. "In diplomacy, in view of the situation that" Wu is attached to Qi and Jin, and resentment is attached to Chu ",the policy of" being close to Qi, deeply attached to Jin, strengthening Chu, and being kind to Wu "was adopted (Biography of Gou Jian's Return to China in the Spring and Autumn Period). Being kind to Wu means imitating the strategy of "attacking" and disintegrating and weakening the enemy by non-war means. The main measures are: pretending to be loyal, making the king of Wu relax his guard against Vietnam, letting him go north to dominate the Central Plains and do whatever he wants, encouraging the king of Wu to love the palace and women, making it large-scale and consuming national strength; And bribery, which expanded the internal contradictions of the Wu ruling clique and undermined its unity. After ten years of implementation, the more "an inch of land and gold, the people are close to each other", and the national strength is revived. The Vietnamese army has also become a well-equipped, well-trained and "deadly" elite force.

Fu Cha, the king of Wu, actively prepared for the Northern Expedition after conquering Yue. Wu Yuan once again put forward that "the more certain, the better", thinking that the more "the disease of the abdomen and the heart", the more "Qilu princes are just scabies". The prince of Wu still has not adopted it. In the thirty-first year (489 BC), when Wu Xian moved to the north, he attacked Chen (now Huaiyang, Henan) in order to relieve the flank threat. In thirty-three years, Wu attacked Lu and opened the door to the Central Plains. In order to establish a strategic base and get through the military traffic arteries, Wu Wei built Hanjiang City (now Yangzhou, Jiangsu Province) on a large scale on the north bank of the Yangtze River in 34 years, and dug a gully from Yangzhou to Huai 'an via Sheyang Lake to connect the waters of the Yangtze River and Huaihe River, and then connected with Si, Yi and Jishui. In thirty-five years, Wu led the allied forces of Lu, Yong and Yong to attack Qi by land; The doctor program was sent to lead the water army from the Yangtze River into the sea, detour to the Shandong Peninsula, and attack him. Wu Shuijun lost the battle at sea, so the allied forces on the land retreated (see Attack Qi). In thirty-six years, Zai Wu attacked Qi and wiped out the elite of Qi in Aileen (now northeast of Laiwu, Shandong) (see the Battle of Aileen). In the thirty-eighth year (482 BC), Fu Cha led Wu Jun's main force into Huangchi (now southwest of Fengqiu, Henan Province) and formed an alliance with the governors of Jin and Central Plains, "seeking to dominate China". At this time, the hegemony of Wu reached its peak.

When Fu Cha, the king of Wu, competed with Jin Dinggong for leadership in Huangchi, Gou Jian, the king of Yue, divided his forces and attacked Wu. An army entered the Huaihe River from the sea, breaking the road of Wu's main force's Huiyuan and covering the main force's operations; Its self-directed main force went straight to Wudu, flooded the suburbs and annihilated Wu Jun, taking advantage of the situation to attack Wudu. Fu Cha returned to the south, fearing that he would run back for a long distance because of the loss of the capital, and his troops would be exhausted, so he sent someone to make peace. Gou Jian didn't want to have an uncertain decisive battle with Wu Jun's main force intact, so he reached a peace agreement with Wu and withdrew. In forty-two years, there was a famine in Wu. The more the opportunity to attack, the more Li Ze (in Wujiang, Jiangsu) confronted Wu Jun across the river. Using the darkness of night, the Vietnamese army lured Wu Jun to divide his troops by feinting with two wings, then concentrated the elite, made a breakthrough in front of the enemy and in the middle, continued to attack, and expanded the results, thus creating a successful example of the earlier river-crossing attack in the history of China War (see the Battle of Li Ze). After the war, the balance of power between wuyue has undergone a fundamental change, and the more it occupies an absolute advantage. In the first year (475 BC), Wu was attacked again. Wu Jun is unable to fight, according to the capital defense. The more you build a city in the southwest suburb of Wudu, the more you seek to attack the city. Wu sent envoys to make peace several times, but the more he refused. In three years, the city was broken, Fu Cha committed suicide, and Wu died (see the article "Vietnam War"). Gou Jian led the army to "cross the Jianghuai River in the north and welcome the governors of Qi and Jin Dynasties in Xuzhou". Zhou Yuanwang named Gou Jian as Bo. "The Yue army runs rampant in the east of Jianghuai, and the vassal is the overlord" (Historical Records: Goujian Family of Yue King), which eventually became the overlord in the late Spring and Autumn Period.