The fire on the Guancheng soon attracted the Wei army who stayed in the Wei camp east of Tongguan, and for a time no one was surprised, and they walked out of the camp tent one after another, watching the fire in Guancheng from a distance.

The soldiers were talking a lot, and they didn't understand why the good and indestructible Tongguan City was so on fire.

Moreover, this fire burned for a whole day and a night, and burned the entire fortress to ruins.

Huang Zhong and other generals who stayed behind were keenly aware that most of them were abandoned by the Han army and fled.

Sure enough, the next day, Hu Che'er rushed over, bringing the news of the victory at Pubanguan and Su Zhe's latest will.

When the news spread, the entire battalion was boiling, and all the 150,000 soldiers rejoiced.

Hu Che'er issued a holy decree to Huang Zhong and others, and the Son of Heaven deduced that Liu Bei would not dare to defend Tongguan again, and would most likely abandon Guancheng and retreat in the direction of Chang'an, and ordered Huang Zhong and others to quickly occupy Guancheng.

Huang Zhong and other left-behind generals received the holy decree, so naturally they did not hesitate anymore and immediately sent troops to attack Tongguan.

Everything was just as Su Zhe expected, Tongguan, which had been burned to the ground, had already been empty, and nearly 40,000 Han troops had all abandoned the city and fled.

In the depths of winter, the battle flag of the Great Wei was finally planted at the head of Tongguan City, announcing that the gate to the Guanzhong Plain had been kicked open.

After Huang Zhongzhong captured Tongguan, he immediately left the pass and headed west, along the south bank of Weishui, all the way to Chang'an.

Two days later, the 150,000 troops of the middle route and the 180,000 troops of the north route led by Su Zhe officially joined forces in Huayin County.

After a short rest, the two armies continued to march westward and went straight to Chang'an City.

Since Liu Bei had abandoned the counties east of Chang'an and shrunk all his mobile forces on the front line of Chang'an, the Wei army was unimpeded all the way, capturing the cities along the way without spending a single soldier, and killed the east of Chang'an in less than seven days.

At this time, the South Road Army on the front line of Wuguan in the south, under the leadership of Lu Meng, entered the Guanzhong Plain from Wuguan and arrived at the city of Chang'an.

At this point, the Wei army of the northern, central and southern routes, with an army of nearly 380,000, officially joined under the city of Chang'an.

At this moment, Liu Bei had retreated to Chang'an City a few days in advance, and put on a posture of being determined to defend the city.

After a series of failures, Liu Bei gathered all the soldiers and horses in Guanzhong in Chang'an, and scraped together less than 90,000 soldiers and horses.

Of the remaining more than 80,000 soldiers and horses, Liu Bei deployed half of them in Chang'an City as the backbone of the city.

At the same time, in order to ensure that Chang'an City would not fall into the siege of the Wei army, Liu Bei deployed half of his soldiers and horses in the north of Chang'an City, on the south bank of Weishui, to form a horn trend.

Weishui runs through the entire Guanzhong Plain, and can reach Liangzhou through Longshan, which can be said to be the link between Liu Bei and Yongliang.

After retreating to Chang'an, all the counties east of Chang'an fell into the hands of Wei, and Liu Bei could only rely on the counties west of Chang'an and Longxi to provide support for his Chang'an City.

The Weishui route is the most convenient waterway for transporting grain, grass and soldiers in the rear, and Liu Bei must of course firmly grasp it.

As for the Weishui Fortress, although it is called Dutou Water Camp, it is actually a small castle.

When Liu Bei withdrew from Yizhou, at the suggestion of Zhuge Liang, he mobilized a large number of manpower and material resources to build a seating barrier day and night, and the materials used were all solid stones, which were enough to resist the bombardment of the divine thunder artillery.

Liu Bei never expected that Zhuge Liang's prescient fate would save his life at this time.

With this Weishui barrier, the grain and grass of the soldiers in the rear were continuously transported to Chang'an, and then transported to Chang'an City from the water gate through the artificially dug ditch.

After such a layout, Liu Bei did not have to worry about being completely besieged by the Wei army and falling into an isolated situation.

And that's exactly what happened.

Although Su Zhe had nearly 400,000 troops, due to the existence of the Weishui barrier, there was no way to completely besiege the city, so he could only besiege Chang'an City from the southeast and southeast directions.

However, this did not affect Su Zhe's determination to capture Chang'an City in the slightest.

After the army met under the city, Su Zhe ordered to set up camp, 400,000 soldiers and horses formed a semicircular company camp, dozens of large and small camps, and the momentum can be described as huge.

After the camp was completed, Su Zhe called Li Yan in the rear to quickly adjust the grain route, and sent the grain and grass that gathered in Luoyang to the front line along the straight road from Luoyang to Chang'an.

Since Tongguan has been captured, the grain road is unobstructed, and the grain and grass in the rear can be transported to the front line at the fastest speed, the most convenient route, and the smallest consumption, which greatly reduces the difficulty of grain and grass transportation.

At the same time, the battle south of Puban Pass caused Liu Bei's cavalry troops to suffer heavy losses, and the number of remaining cavalry was less than 20,000, and the number of cavalry was already less than that of the Wei army, and it was impossible to send enough cavalry deep into the flank of the Wei army to attack the grain and grass.

At this point, the problem of grain and grass for the Wei army was completely solved.

And the Xianbei and other Hu people on the border of Youhe, as Su Zhe expected, after learning that the Wei army broke Liu Bei, entered the Guanzhong Plain, and entered the siege of Guanzhong, they fell into a wait-and-see state, and did not raise troops to the south to respond to Liu Bei.

There is no worry about food and grass, and there is no threat to the northern border for the time being, Su Zhe can be said to have no worries at all, so he can let go of his hands and feet and fight to the end with Liu Bei on the front line of Chang'an.

Fifteen days later, nearly 500 divine thunder cannons and more than 400 bed crossbows were transported to the Chang'an camp.

Su Zhe did not hesitate for a moment, and immediately ordered to launch a deterrent attack on Chang'an City with a long-range attack first.

And so, the bombardment began.

From day to night, countless stone bullets were endlessly bombarded the enemy city, and the deafening roar continued all day long.

Giant crossbows also shot at Chang'an City like raindrops, piercing most of the city walls into hedgehogs.

Although Chang'an City was strong, the Wei army's bombardment did not cause substantial damage, nor did it collapse the city wall, but the spiritual blow to the soldiers and civilians of a city was unprecedented.

The soldiers and civilians of the Han Kingdom, who were already unstable, faced with the wild bombardment of the night and night, and were worried all day long, fearing that if they were not careful, death would fall from the sky and smash them into a dead corpse.

The breath of panic, like a plague, enveloped the imperial capital of the Han Kingdom.

In the evening of the same day, another round of bombardment ended, and the world finally returned to calm.

In the palace hall, Liu Bei let out a long breath, and his tense nerves were finally relaxed slightly.

However, he knew that the calm was only temporary, and after an hour, the bombardment of the Wei army would continue.

"Prime Minister, the Su thieves are so rampant, bombarding like this all day long, which has seriously damaged the morale of the soldiers, do you have any way to kill the rampant Wei army?" Liu Bei's eyes looked at Zhuge Liang at the palace gate.

Zhuge Liang stood with his hands in his hands, looking at the gloomy sky from afar, thoughtful.

Suddenly, his eyes moved slightly, and he stretched out his hand.

A snowflake fell into the palm of his hand, quickly turning into a droplet.

It's snowing.

In Zhuge Liang's eyes, a trace of coldness suddenly swept up.