Tucheng is the most common city in the northwest, except for a few large towns that can afford the high cost of stone towns, most of the small cities are made of local materials, and the earth is used as the wall. And the defense line in front of Pei Shan City happens to be all earthen walls, and the defensive ability of the earthen walls is actually more than enough in places where there are no male soldiers in the Western Regions. But the Huns used it to deal with the Han army, which was inevitably a bit insufficient.

The Han army on the ground poured bows and arrows on these earthen cities day and night, huge oil bombs, and the heavy impact smashed the Huns so that they could hardly raise their heads. Underground, teams of engineers are working around the clock to dig tunnels.

That's right, this is Gao Zheng's strategy, instead of a head-on attack, a city in two months, such an impact, I don't know how to rush to the year of the monkey and the month of the horse, it is better to dig a tunnel in twenty days and dig these hateful lines of defense from the foundation.

Although digging underground, it is much safer than carrying the bows and swords of the Huns, and the Han people are known for their hard work, and a ten-mile-long tunnel has been completed in only one month.

The Han army chose a late night to plant gunpowder under the city wall, roaring and thundering, the earthen wall collapsed, and countless sleeping Hu Congjun could only hurriedly pick up arms to meet the battle. But in the face of the Han army holding back the fire, from the gap in the city wall poured in like a tide, they could only surrender with both hands, anyway, they were just cannon fodder, usually when the warlord team was still there, they could still fight hard, and now that the Han army came to 'free' them, they naturally raised their hands and surrendered immediately.

The Han army, which stepped on the ruins and entered the ruins, was not satisfied with this line of defense, but chased the defeated soldiers all the way to the next line of defense, and the defenders of the third line of defense did not dare to open the door easily, and could only watch their comrades being beheaded by the Han army under the city. Seeing that the Xiongnu army seemed to have made up its mind to close the door, the Han army could only withdraw unwillingly.

However, it took less than a month for the Han army to break through the second line of defense, and it had already deeply shocked Pei Shan's Xiongnu court.

"Damn! Damn!" But Moore angrily smashed the precious Zhongtu porcelain in the room, "This pair of Gao family father and son! It's really uneasy, Lao Tzu is a ruthless man, and his son is a monster!"

King Zuo Xian said calmly, "Now that the Han army has found the weakness of these earthen walls, this defense line is no longer impregnable, at most it can only play the role of delaying time."

But Moore turned around and asked, "How else can it be delayed?"

King Zuo Xian arched his hand and said, "Let him dig the tunnel, we can't dig the tunnel, we dig it, but it's much stronger than them."

But Moore waved his hand, "Go and do it immediately, no matter what, you have to block the Han army!"

The Han army was not immersed in the joy of breaking through the second line of defense in January, for them, it was not the time for them to find the main force of the Xiongnu for a decisive battle, and then to recover the Western Regions.

After Gao Zheng dug through the second line of defense, he immediately reversed his plan and directly gave up the way of digging tunnels, he knew that this method could only be used unexpectedly once, and the second time unless the other side was a fool, otherwise the other party would definitely see through. Therefore, the third line of defense, Gao Zheng did not go underground, but returned to the ground to create an extremely powerful 'Xuanwu car'.

The Xuanwu car is a solid chariot wrapped in iron sheets, the soldiers of the Han army hid in the car, they were not afraid of the arrows and crossbows that came up from the city tower, the Han army took out tools, spread the surface of the city wall with a large amount of water, and dug through the front roughly, this plan is not a day's work, but for the Han army, it only needs to dig the earthen wall to a certain extent, and then you can rely on the hammer in the Xuanwu car to hammer through the city wall in one breath, this time, the Han army spent half a month, directly dug up the front wall of the third line of defense of the Huns.

The city wall collapsed violently, in a way that was even more brutal than the second wall, but the Huns were immersed in the tunnels and could not extricate themselves. When the news reached Pei Shan, Moore and the nobles were dumbfounded. The speed of the Han army's strategy has far exceeded their imagination. And the technique is cramper and special every time. It is impossible to guard against it, three of the six lines of defense have been broken through in April, and it will be at least a few months before heavy snow comes, and at this rate of the Han army, you can't guess if the Han army will suddenly appear under the city one day.

Pei Shan City, which was originally quiet and peaceful, was turbulent for a while, and most of the nobles began to move, and they were all thinking about whether to start moving the large amount of treasures they had stolen from Pei Shan and the Blue Mansion elsewhere. But Moore naturally would not allow such desertion to happen. After personally leading the royal court guards to kill a small nobleman, the Hun nobles stopped a little. But Moore knew that relying on this kind of terrifying and high-pressure means would only work temporarily, because the Hun army still had three lines of defense in front of Pei Shan. However, when the last line of defense was also breached, and it was necessary to face the front of the Han army, after a winter, many pampered nobles must first consider fleeing for their lives, rather than fighting.

On this day, King Zuo Xian and King Right Xian rarely got together to discuss this increasingly unbearable line of defense.

"The speed of this Han army is getting faster and faster every time, will there be news of breaking through the fourth line in ten days?"

"It's hard to say, if the first line of defense, the Han army still suffered a little loss, then the second and third lines of defense are the Han army's return with interest. This time, although it was the imperial brother of the Han Dynasty, the spies reported that the imperial brother of the Han Dynasty had never left Yumen Pass. Therefore, the commander of the Han army on this front line will only be Gao Zheng, but I didn't expect Gao Zheng to be out of the army for 20 years, and he is not in the north that he is familiar with, but he has adapted so quickly, and he is worthy of being the first general of the Han Dynasty," Zuo Xianwang said.

"Tunnel, Xuanwu Che, what methods do you think the Han army will use next?"

King Zuo Xian nodded helplessly, "For now, it can only be so, after all, the city is standing still and it is almost the same, and the siege method, it is really thousands, we are now four, five, six and three lines of defense, the city wall has been thickened, and the tunnel has been dug, I don't know where the Han army will come from, maybe, they will come from the sky?"

King Youxian rolled his eyes, "From the sky, Brother Zali, if the Han army can really come from the sky, then we are fighting with the Great God, enough for us to die a hundred times, right?"

How do you know that King Zuo Xian said, "Just rush to the Han army of Shule to dig a well halfway up the mountainside, I feel that everything in front of me is so incredible." ”