When Lu Zhongsu and Qi Xin in Qiting City led the defenders to repel the surprise attack of a thousand Sui soldiers, they heard the news that Yang Su had led four five-toothed giant ships to break through the three iron chain blockades and was sailing through the river around Qiting and heading downstream.

The two of them knew that if the Sui fleet led by Yang Su successfully passed through the Qiting River and entered the middle reaches of the river, it would deal a fatal blow to the defense line along the river in Nanchen, and the two of them were bound to be punished extremely severely.

At this critical juncture, Lü Zhongsu wisely handed over the command of the Nanchen Naval Army, and asked Qi Xin to lead hundreds of Qinglong warships of the Qiting Naval Army to pull anchor and set off, and intercept the Sui Dynasty Naval Army in the upper reaches of the river at all costs. And Lu Zhongsu himself learned the lesson of Qi Xin's defeat at the Wolf Tail Beach, and personally led the army soldiers and horses under his command to wait for the north bank of the river, preparing to meet the invading Sui army soldiers and horses.

Qi Xin was originally one of the top naval generals in the Later Liang Kingdom, and he was very good at leading the naval army to fight. He took over the supreme command of the Nanchen Navy from Lü Zhongsu, and when he led the Qinglong warship moored at the dock near Qiting to meet the enemy, the four vanguard and five-tooth giant ships led by Yang Suqin had already passed through the Qiting River.

Seeing this situation, Qi Xin decisively ordered the Nanchen Navy to use half of its troops and warships to penetrate behind enemy lines to cut off the communication between the vanguard of the Sui army and the main force of its fleet.

Yang Su himself was on the second five-tooth giant ship, and saw that the Nanchen Naval Army of Qiting dispatched hundreds of Qinglong warships to besiege it, and immediately ordered the vanguard ships to try to avoid using bows and arrows to shoot the sergeants on the enemy ship, and to use the slapstick to sink the opponent's warship and deter the military spirit of the Southern Chenshui Army.

The commanders of the four vanguard and five-toothed giant ships received the order, and then ordered the slapping rods on their respective ships to remove the rod coats, fill them with basin-sized stones, and when the enemy Qinglong warship entered the firing range, they shouted in unison: "Release."

However, I saw nearly 100 boulders shooting out of the dozens of zhang high slapsticks installed on both sides of the Wuya giant ships of the Sui Army, drawing a long arc on the surface of the river, and smashing straight into the hundreds of Qinglong warships sailing in the oblique thorns.

Before the officers and soldiers of the Nanchen Navy on the Qinglong warship could see what was thrown at the Sui Army's Wuya giant ship, they heard a loud "boom" under their feet, and then heard a companion on the deck exclaim: "The deck has been smashed out of a big hole, and the warship is about to sink." Before the words fell, another boulder hit the Qinglong warship, and the Nan Chen soldiers on the ship didn't even have a chance to jump off the boat to escape, so they sank into the river with the ship.

After several rounds of slapping attacks, more than half of the hundreds of Qinglong warships led by Qi Xin lost their combat effectiveness, either the warships were hit and sunk by the boulders thrown by the slapping rods, or the generals on the warships were frightened by the boulders constantly thrown from the opponent's five-tooth giant ships, and without waiting for the main general's order, they ordered the sailors to turn the bow of the ship and withdraw from the battlefield.

At the same time, although the fleet sent by Qi Xin to cut off the connection between the vanguard of the Sui army and the main force was not attacked by the slapping rod and stone throwing on the giant ships of the five teeth, it fell into the encirclement of thousands of Yellow Dragon warships, and before it could attack the main force of the Sui army, it fell into a situation of scattered retreat.

Qi Xin knew that he led the army to defeat at the Wolf Tail Beach and the second on the Qiting River, even if he escaped back to Jiankang alive, it was difficult to guarantee that he would not be executed, seeing that the hundreds of warships he led to the expedition did not even have the strength to fight back under the fierce slapping attack of the opponent's four five-tooth giant ships, he was defeated and defeated, he couldn't help but sigh on his back, pulled out the sword at his waist, and wanted to commit suicide.

As a result, he was stopped by several pro-soldiers, who begged him to know the current affairs as a handsome man and surrender to the Sui army. Qi Xin thought about it and had no other way to go, so he threw his sword and surrendered to Yang Su.

Yang Su led the main fleet of the Sui army, annihilated the Qiting Nanchen Water Army, surrendered the Southern Chen Water Army General Qi Xin, and penetrated the waterway in the upper and middle reaches of the river.

Yang Su led the Sui Dynasty to attack Chen's army on the west road, broke through the two defense lines of Langwei Beach and Qiting one after another, and the news of entering the middle reaches of the Great River quickly spread back to Jiankang, the capital of the Southern Chen Emperor.

Chen Shubao is under the strength of Kong Fan, outside the city of Jiankang to gather the three armies, held a swearing-in meeting, ready to fight to the death with the Sui Dynasty army, at first heard that Yang Su's army successively defeated Nan Chen, known as the world's first naval army, has entered the middle reaches of the river military report, can not help but panic, urgently summoned Xiao Maha, Ren Zhong, Lu Guangda and a group of former generals to urgently discuss countermeasures.

As early as before Chen Shubao adopted Kong Fan's suggestion and wanted to transfer the Southern Chen Water Army in the lower reaches of the Jiujiang River back to Jiankang and prepare for a head-on decisive battle with the main force of the Sui East Road on the north bank of the river, Xiao Maha, Ren Zhong, and Lu Guangda, the three famous generals of the Southern Chen Xuan Dynasty, successively wrote to the emperor, opposing the abandonment of the defense along the river downstream and concentrating the main force of the army in Jiankang. insisted on transferring the main force of the Nanchen army in the lower reaches of the river back to Jiankang, and after preparing for the swearing-in meeting, Kong Fan was appointed as the commander of the whole army, and fought to the death with Yang Guang on the north bank.

As a result, at this urgently convened military meeting, serious disagreements arose between several former generals.

At the beginning of Chen Shubao's succession to the throne, Xiao Mahali, who was trusted by Chen Shubao because he led the army to quickly quell the rebellion of Chen Shuling, the king of Shixing, came to the general and the water came to Tutun, and suggested that Chen Shubao should lead the army to lead the army stationed in Jiujiang Chen Shushen, the king of Yueyang, to march westward, and together with Chen Huiji, the assassin of Xiangzhou, and other generals to intercept the Sui West Route Army, Zhou Luoyu temporarily took charge of the Jiujiang garrison on behalf of Chen Shushen, preventing the Sui Middle Route Army from advancing to the lower reaches of the river, meeting with the Sui East Route Army, and forming a joint encirclement of the imperial capital Jiankang. As soon as the Sui Eastern Route Army led by Yang Guang on the north bank crossed the river to attack, it would give a head-on attack to ensure that the imperial capital Jiankang was foolproof.

Objectively speaking, Xiao Maha gave Chen Shubao this countermeasure is decent, such as the upper, middle, and downstream three ways of people can effectively intercept and block the invading Sui army, which is a good strategy to protect the country and the country.

However, the biggest shortcoming of this countermeasure is that the upper route has been broken through by the western Sui route army, and there is no danger to defend, and once the central and western Sui armies converge in the middle reaches of the river, it will inevitably add great pressure to the defense of the downstream core area, and may even bring about a catastrophe.

Therefore, another famous general of Southern Chen, Ren Zhong Ren Manu, presented Chen Shubao with his good strategy for retreating from the enemy in view of the shortcomings in Xiao Maha's strategy.