Before the war, Luo Ming transferred all the troops stationed in Heishui River to protect the castle, so that the defenders of the castle reached 40,000, and there were more than ten people guarding the front of the defense per meter on average, and the strength was not weak. Therefore, Jiang Yunhui, who is known for his prudence, had planned a long time ago and used a sneak attack to open up the situation at the beginning.

Just after midnight, he sent out the vanguard, as planned. Two assault teams of 1,000 people each, dressed in black, quietly approached the walls of the Qinglong Kingdom under the cover of night. The city wall has been damaged in many places, but the guard general Luan Xunjie has been organizing officers and soldiers and people to repair the city wall in recent months, and finally the city wall was largely repaired before the war.

The two assault teams were about a few dozen meters away from the city wall, and they were successively discovered by the officers and soldiers on duty in the Qinglong Kingdom.

"Alarm!", "The Northern Alliance is coming!!" The mournful shouts pierced the night sky. Every officer and soldier in Black Cloud City who was in charge of the sentry duty howled desperately and sparingly as if they were about to tear their throats at that moment. Some soldiers rushed to the huge pile of dry firewood that had been collected and piled up long ago, and lit a fire. At this time, the dark clouds began to dissipate, and the moon showed its bright face. The rising wolf smoke soared into the sky.

On a night without a trace of wind, the people in the capital, the city lord in the palace, Wei Yuankang and other ministers in the palace were all woken up from their sleep, climbed to a high place, and looked at the few beacon smoke rising in the direction of the border. Almost everyone was muttering a phrase on their lips: "O gods, it has finally begun!"

The hoarse shouts of the soldiers at the head of the city made the people of the Northern Alliance Death Assault Team understand that the plan for a sneak attack had been revealed. They quickly sprinted 100 meters and pounced on the city wall as fast as they could, some of them used bows and arrows to suppress the city head, while others threw their claws at the wall and began to climb the wall. They had to seize a few breaches before most of the soldiers of the Blue Dragon Kingdom woke up from their dreams and rushed to the city walls for reinforcements, so that the follow-up troops on their side could keep up.

However, the officers and soldiers on night duty in Black Cloud City were very brave. They were few in number, but they were all like crazy, braving the rain of arrows from the city, holding the stones that had been prepared on the city walls, or holding burning torches, and throwing them down with their flying claws. The daredevils of the Northern Alliance were quite brave and rushed to the top of the city in desperation

But every time a Northern Alliance soldier climbed up, immediately several officers and soldiers defending Black Cloud City rushed up like hungry tigers to slash and slash, and threw corpses and stumps off the city wall to intimidate the attackers. With their high fighting spirit, they repelled two rapid attacks by the Northern Union's death commandos.

Seeing that more and more officers and soldiers were pouring onto the city wall to participate in the defense of the city, the Northern Alliance commandos had to retreat quietly.

Many torches and bonfires were lit on the first line of the castle wall, illuminating both sides of the city wall. People looked far away, and they didn't see any trace of the attack of the large army of the Northern Alliance for a long time. Was this just a small, tentative sneak attack?

Luan Xunjie didn't believe this, if this sneak attack failed, there would be no benefit to the Xuanwu Kingdom except for reminding the Qinglong Kingdom to be vigilant. Therefore, Luan Xunjie unswervingly believes that a larger-scale assault will be launched soon.

About half an hour later, torches began to appear on the distant horizon. Then came the cacophony of human voices, the snorting and neighing of horses, the turning of large wooden machinery, and the chaotic sound of war drums and horns.

It didn't take long for the torches to grow more and more, and soon the people standing at the head of the city could see in the distance an endless and innumerable number of torches, which were rushing in their direction.

The opponent stopped about five hundred meters away from the city wall, a distance that even a special compound strong bow could not reach. Then, their team slowly rolled out twelve large heavy wooden vehicles, which some recognized as heavy bone soul catapults.

Luan Xunjie hurriedly beckoned the soldiers to retreat from the city wall and find a strong place to hide by himself. Only a small number of people are left to monitor each other's movements.

The catapult was quickly placed, and the sound of "boom boom" firing was heard. Stones the size of an ordinary man's vegetable basket flew up the city wall and smashed down with a crackle. The bursts of these stones are slow, and it takes a few minutes for a car to fire a stone.

Although these stones can cause damage to the city wall, the destructive power is not very large. It's just that the sound of the big rock flying is very amazing, and if anyone is smashed, they will be crippled if they don't die.

Luan Xunjie hadn't seen the power of this thing, so he hurriedly asked the soldiers to dodge. Later, some experienced soldiers said that as long as they paid attention to the trajectory of the stone in the air, it was not difficult to dodge. Only then did he relax and beckon the soldiers to return to the city wall to participate in the defense, just telling everyone to be careful.

Under the bombardment of large stones, the camp of the Northern Alliance launched some large vehicles and equipment - heavy bone soul crash vehicles. The principle of this thing is actually not complicated, to put it bluntly, on the frame with wheels, a tree trunk that can only be hugged by about two to three people and weighs several kilograms is hoisted as a ramming mallet.

The ramming head of the ramming hammer was wrapped with iron, and when the car slammed into the city gate, the huge ramming mallet suspended from the car used inertia to hit the city gate.

The destructive power of this kind of crash car is quite amazing, basically all the city gates can not withstand the repeated collision of this kind of vehicle, even the city wall up to three or four meters thick, under the impact of this crash car, it will not take a few strokes to collapse.

The canopy of the crashing car was covered with multiple layers of thick armor, not to mention ordinary arrows, even ordinary large rocks could not be smashed through. Nearly two hundred soldiers could be accommodated under the canopy to propel the car, and they had enough self-defense capabilities even in the face of an attack by the opposing squad's soldiers. This is simply a heavy tank of its time.

It's just that the cross-country ability of such a car is poor, and it is very bulky, which is not suitable for long-distance combat use.

Under the cover of catapults, the heavy ramming vehicles rumbled towards the city gates, and the cavalry and infantry of the Xuanwu Kingdom also gradually followed, and began to use a large number of bows and arrows to cover the advance of the ramming vehicles.

For a moment, all kinds of arrows flew up the city like rain. The officers and soldiers defending the city began to enter a nightmarish hellish environment