At the time of the fierce battle at Wulongkou, Cao Liang had already mobilized three infantry battalions out of Yangjiban and rushed directly to Hanoi County.

The main reason why Cao Liang let the three infantry battalions go first, and the Tun Cavalry Battalion and the Xiao Cavalry Battalion were postponed, the main reason was that after entering Hanoi, the infantry battalion would take on the main siege task, and the cavalry team would not play a big role for the time being.

Cao Liang had already thoroughly studied the defensive situation of Hanoi County, and his dispatch of troops had been planned earlier, but Ma Long's sudden addition added a guarantee to Cao Liang's plan.

Now that Ma Long is in Wulongkou, he has successfully dragged Chen Tai's main force, and now when everyone's eyes are focused on Wulongkou, Cao Liang suddenly marched from Yangjisaka, and he could kill Sima Jun by surprise.

After the state army killed Yangjiban, Cao Liang immediately divided his troops into three routes, Yanghu's infantry battalion directly took Wen County, Zhanhong's left guard battalion directly took Yewang, and Liu Jing's right guard battalion directly took Huai County, and the three-way army went out together, and attacked Wen County, Yewang and Huai County at the same time.

Although there are dozens of cities in the entire Hanoi, in order to shrink the defense, Chen Tai deliberately deployed his troops in the triangle area of Huai County, Wen County and Yewang, so this time Cao Liang attacked Hanoi, the goal was directly aimed at the above three cities, as long as these three cities were taken, Chen Tai would have no place to stand in Hanoi.

In order to eliminate the vanguard battalion of the Bingzhou army that suddenly invaded Hanoi, Chen Tai deliberately transferred 10,000 horses from Wen County and Yewang to set up an ambush at Wulongkou, trying to annihilate the Bingzhou army in one fell swoop.

However, this time Chen Tai, who was full of confidence, seemed to have kicked on the iron plate, and fought fiercely in Wulongkou for a day and a night, but instead of taking the pioneer battalion, he lost his troops and suffered heavy losses.

This battle also attracted the attention of almost the entire Hanoi County, and everyone's eyes were almost focused on Wulongkou, so that they were completely unprepared for the sudden attack.

The first to be attacked was the northernmost castle of the triangular defense, and the wild king was located not far south of the exit of Yojizaka, so he naturally bore the brunt.

Zhan Hong led the left guard battalion in the dusk raid Yewang City, the left guard battalion and the right guard battalion are the two newly established teams of the state army, although it is a new army, but after more than a year of drills, has formed a fairly strong combat effectiveness, in the battle of Pingyang half a year ago, the left guard battalion has been prominent, has hit Hu Fen's army.

In the siege of the city, Zhan Hong first used a catapult, this round of stone rain smashed the unsuspecting Yewang defenders in a daze, and also smashed the defense settings of Yewang City, and when the defender Zhang Ren just understood that he was attacked by the enemy and wanted to organize the army to defend, the fast-moving left guard battalion had already boarded the city and launched a fierce attack on the target in the city.

Due to Chen Tai's transfer of a lot of troops from Yewang City, the defense of Yewang City was a lot empty, and under this sudden blow, the defender Zhang Ren lacked sufficient adaptability, and the battle lasted less than half an hour, and most of the important targets of Yewang City fell into the hands of the Bingzhou army.

Zhang Ren saw that the general trend had gone, so he could only lead the remnants of the defeated army to flee from Yewang City and go to Chen Tai in the direction of Wulongkou.

The battle in Wen County was the same, and half an hour after the attack on Yewang, Yanghu also launched an attack on Wen County.

The attack power of the catapult is almost overwhelming in the era of cold weapons, especially the equipped catapult equipped by the Bingzhou army, whether it is in the range or the weight of the stone projectile, it is far superior to the trebuchet of the ordinary equipment of the Wei army.

Since the target of the catapult attack was the city wall, the impact point was relatively high, and if the catapult directly attacked the city wall, the entire city wall could collapse as long as it took a little time.

However, the siege of Yanghu is only for a quick victory, so the catapult siege is only an auxiliary means, after a round of cleaning with stone bullets, the siege infantry has already rushed up with a ladder, Sima Jun has not had time to wake up from the blow, and the state army has already stepped on the city.

After that, there was no suspense in the battle, and for the infantry battalion, which was a hundred battles, such a battle was almost a piece of cake.

After losing the city's defense capability, the defenders of Wen County, who were already in a crippled lineup, could not resist the attack of the Bingzhou army at all, and the defender Li Yi was critical to his life, so he did not dare to fight with the Bingzhou army at all, and as soon as he saw that the general trend had gone, he immediately fled in a hurry.

The battle of Wen County was carried out half an hour later than the battle of the wild king, but it was Wen County that was the first to lose, Li Yi only made a little symbolic resistance, and abandoned the city and fled.

However, the army brought out by Li Yi was more than Zhang Ren's, and he had not experienced much fighting, the losses of the defenders of Wen County were relatively small, and the formation of many teams was still complete, while the defenders of Yewang had suffered heavy losses after a desperate struggle, and many of the formations of the tribes were disabled.

After the two escaped from their respective cities, they coincidentally moved closer to Wulongkou, and the surprise attack of the state army completely stunned them, and now they had to defect to Chen Tai and let him find a way.

After Lianhong and Yanghu took Yewang and Wenxian, they did not rush to pursue, they were ordered by Cao Liang to immediately reorganize the defense of the city and beware of the counterattack of Sima's army.

Compared with the two sides of Yewang Wen County, the attack on the right guard battalion of Huai County was not so smooth, although the attack routine used by the right guard battalion was no different from the left guard battalion of the infantry battalion, but Chen Tai did not transfer troops from Huai County, so its defensive strength was still complete, and although the surprise attack of the state army caused chaos among the defenders of Huai County, it still stabilized its position under the command of the defender Wei Guang.

Under the cover of night, Liu Jing commanded the infantry to attack, but the defenders of Huaixian County fought very tenaciously, and fought fiercely for a night, and the right guard battalion never broke through the defense of Huaixian, Liu Jing had no choice but to retreat a little after dawn, preparing to rest a little, and launch an attack again.

Just when Liu Jing was preparing for a second attack, he suddenly received an order from Cao Liang, Chen Tai, who had retreated from Wulongkou, joined the defeated troops of Yewang and Wenxian and was rushing to Huaixian to help, Cao Liang asked Liu Jing to immediately give up attacking Huaixian and transfer to Yewang.