Wang Kunjun's troops advanced to about 100 miles north of Lizhou, an important town in Wuping (Hunan), and then did not continue to move south, but suspended their march and set up camp on the spot, waiting for more than 10,000 people of the Nanping (Jingnan) Naval Army, which were ordered to cooperate with the Beiping Army, and the first regiment of the "Flying Dragon Army" and the two regiments of the "Security Army" led by Zeng Zhilin to fight with them, arrived near the predetermined place - the mouth of the Sanjiang River in Yuezhou, and then made a two-pronged attack to put Wuping (Hunan) to death.

The news of the arrival of the Zhou army in the vicinity of Lizhou reached Langzhou, which made Zhou Baoquan and his ministers of civil and military affairs panic and worried. So much so that at the military meeting held on the sixth day of the first lunar month of the tenth lunar calendar of Xiande, Zhou Baoquan and the military generals of Wuping (Hunan) were full of worry and uneasiness, and they did not have the joy of celebrating the Spring Festival, nor did they see the relaxation brought about by the good news that Yang Shifan had just defeated the rebels at Pingjin Pavilion and captured Zhang Wenbiao. After all, in the name of borrowing the road, the Zhou army did the thing of destroying the false way, and it only took half a day to take Jiangling City cleanly and bloodlessly, and included Nanping (Jingnan) in his own pocket, which could not help but make Wuping (Hunan) monarchs and ministers fearful and uneasy - although Wuping (Hunan) is far stronger than Nanping (Jingnan) in terms of territory, population, economy, and military, whether it is Zhou Baoquan or those civil and military generals under him, No one thought that they could fight the powerful Zhou army with the power of Wuping (Hunan), let alone that this Zhou army was actually composed of the elite of the Beiping army, which could be called the "first army in the world".

However, it is impossible for Zhou Baoquan, especially those civil and military generals in Wuping (Hunan) to be captured in this way. After all, from the time when Ma Yin was officially canonized as the king of Chu by the Later Tang Dynasty, it has been nearly 30 years since this part of Hunan was completely self-reliant. And if it is counted from the time Ma Yin was made the envoy of the Wu'an Army, Hunan has even been under the direct rule of the Central Plains Dynasty for more than 60 years, and the sense of identity and belonging of the Central Plains Dynasty from its leaders to the military generals of Wenchen is very low. Although whoever sat in Kaifeng City as emperor would be called a tribute, it was only a necessary form of recognition from the Central Plains Dynasty for their rule over Hunan, not true submission and subordination. Therefore, although everyone does not think that Wuping (Hunan) can compete with the Central Plains Dynasty with its own strength, and does not think that Wuping (Hunan)'s own soldiers and horses have the power to fight with the elite of the Beiping Army, which can be called the "first army in the world", but in the face of the surging Beiping Army, the civil and military generals of Wuping (Hunan) still decided to fight with each other and be the trapped beast that is still fighting.

As a result, in the military discussion, the military generals who were in favor of rejecting the Zhou army outside the city and meeting the Zhou army still accounted for the majority. As for Zhou Baoquan, who was the lord of Wuping (Hunan), although he was more inclined to follow his father's confession, lead the people to join the Great Zhou, and move to Kaifeng for a few years of peace, but he was not willing to oppose the almost invincible Beiping army. However, at the age of eleven, he had neither the ability nor the strength to act as arbitrarily as his father, so he could only listen to the advice of his subordinates and ordered the entire territory of Wuping (Hunan) to be on guard to prevent the Zhou army from entering.

As soon as the order was issued, the prefectures, prefectures, and counties of Wuping (Hunan) immediately took action. As the gateway to Wuping (Hunan), Lizhou was the only place for the "Jinghu Expeditionary Army" to go south to Langzhou, and naturally became the pawn of the Zhou army. Like those Wuping (Hunan) Wenchen generals in Langzhou, Zhang Congfu, the defender of Lizhou, did not think that with the less than 10,000 soldiers and horses in his hands, he could withstand the 40,000 tigers and wolves of the Zhou army, but he was not reconciled to abandon his weapons and surrender and be captured. Therefore, on the one hand, he drove the young and strong people in the city of Lizhou to the city, strengthened the city, and assisted in the garrison, and on the other hand, he ordered people to tear down all the bridges on the road that the Zhou army must pass through to the south, and blocked the road with giant trees, and cut off the waterway with sunken ships, so as to hinder the advance of the Zhou army and increase the difficulty of its supply, in a vain attempt to achieve the goal of letting the Zhou army retreat in the face of difficulties.

Zhang Congfu's arrangement, Zhou Baoquan and the reactions of Wuping (Hunan) Wenchen generals were naturally expected by Wang Kunjun and others. Seeing that the other party was facing the "Jinghu Expeditionary Army" of the Later Zhou Dynasty, which was much stronger than the Song army in the previous life, he still refused to hand over the territory and rights, and still acted frequently, vainly trying to block the car with his own strength, Wang Kunjun was no longer polite to the other party.

On the morning of the eighth day of the first month of the first lunar month of the tenth lunar calendar of Xiande, with the arrival of the agreed time, the Nanping (Jingnan) Navy and the first regiment of the "Flying Dragon Army" Marine Corps and the "Security Army" cooperated with each other to launch a fierce attack on Yuezhou and fight with the Wuping (Hunan) Navy at the mouth of the Sanjiang River.

In the face of the Nanping (Jingnan) Navy supported by the First Regiment of the "Flying Dragon Army" Marine Corps, the Wuping (Hunan) Navy was almost powerless. After the most courageous and front-running warships were hit and caught fire by a mortar unit of the Marine Corps fighting with the ships, and quickly sank, the other warships of the Wuping (Hunan) Navy completely lost their fighting spirit, turned their bows one after another, and fled into the depths of Dongting Lake. And Zeng Zhilin naturally would not just let go of these guys who didn't know the height of the sky, and immediately led the army to chase after them until the other party was completely annihilated in Dongting Lake, so he ordered a part of the soldiers and horses of the Nanping (Jingnan) Navy Army and a regiment of the "Security Army" to return to Sanjiangkou to seize Yuezhou City, which was no longer defended, and on the other hand, he personally led the main force of his department and another part of the Nanping (Jingnan) Navy to pass through Dongting Lake and go straight to Langzhou.

In the Battle of Sanjiangkou, Zeng Zhilin's troops and the Nanping (Jingnan) Navy killed more than 4,000 Wuping (Hunan) Navy troops and captured more than 700 ships of various types. At the same time that Zeng Zhilin led his troops to fight fiercely with the Wuping (Hunan) naval army at the mouth of the Sanjiang River, the main force of the "Jinghu Expeditionary Army" led by Wang Kunjun also launched an attack on Lizhou City.

Although Zhang Congfu, the defender of Lizhou, had tried every means to increase the difficulty of the march of the "Jinghu Expeditionary Army" and delay its advance, in the face of the well-equipped, well-trained, and experienced engineering units of the Beiping Army, these obstacles were far from having the desired effect. In just two days, the engineering unit of the Beiping Army cleared a fast passage for the combat troops to the city of Lizhou, so that the latter could quickly advance and encircle the city.

On the morning of the eighth day of the first month of the tenth lunar calendar of Xiande, almost at the same time as the water battle at the mouth of the three rivers, Wang Kunjun also issued an order to attack Lizhou City. Immediately, hundreds of artillery pieces of the "Jinghu Expeditionary Army" roared at the same time. However, in just a short period of time, the entire city of Lizhou was submerged in the smoke of flames.

Before the eighth afternoon of the first lunar month of the tenth lunar calendar of Xiande, the "Jinghu Expeditionary Army" successfully captured the city of Lizhou. In this battle, the "Jinghu Expeditionary Army" completely annihilated the defenders of Wuping (Hunan), killing more than 3,000 people under Zhang Congfu and capturing nearly 5,000 people.