The sailor and Wei Chi Baolin's department have converged into one place, and the news that the soldiers are coming to the city of Daxing will soon be received by Cheng Chumo.

However, Cheng Chumo couldn't immediately send troops to Daxing City, and Wu Yuanqing and them jointly attacked the city.

Because he was firmly pinned down by the defenders of the city.

Beisha City, the local Goguryeo people called it the Great Black Mountain City, because its geographical location is located in the Great Black Mountain, built on the middle and south peaks and adjacent ridges, stretching for ten miles. It was built in the last years of the Eastern Jin Dynasty for more than 200 years.

Unlike the general city wall in the Central Plains, which uses rammed earth to lay bricks and stones on both sides, Beisha City is built between two mountain peaks and along the ridge of the mountain, so it is very convenient to take stones, so its city walls are all built with large stones.

Don't look at the city wall is not very high, but the solidity is top-notch, the stone wall is built with the mountain, stretching for about ten miles, and it is very oppressive from a distance.

The canyon is the center of the city, the canyon in the city is winding, the cliffs outside the city are all around, and the camp is camped in the city, which can be attacked, retreated and defended, and the difficulty of overcoming it is naturally top-notch.

The Sui Dynasty made three expeditions to Goguryeo, only the third time, Laihu'er crossed the sea from Laizhou to Beisha City, and only after a hard battle did he repel Beisha City and Goguryeo's tens of thousands of reinforcements to take Beisha City, but only to take, the actual number of enemies killed was only a few thousand.

Because at that time, not only was the Sui Dynasty overwhelmed after the first two conquests, but also Goguryeo, which had been beaten twice, and even Goguryeo, which was not strong in national strength, could not hold up the third conquest of the Sui Dynasty with all its might.

That's when Laihu'er killed thousands of enemies, then tens of thousands of Goguryeo soldiers and horses retreated, and Beisha City was occupied.

It's a pity that Emperor Yang of Sui will always make wrong decisions, and Goguryeo can no longer support it, so Emperor Yang of Sui did not take advantage of his illness to kill him, but after King Gao Yuan of Goguryeo was afraid of sending an envoy to surrender and was imprisoned and sent back to Hu Sizheng, Emperor Yang of Sui happily ordered to retreat.

After he withdrew from the army, when he recruited Goguryeo King Gao Yuan into the court, Gao Yuan, who got a chance to breathe, refused very facelessly.

By the time Emperor Yang of Sui was preparing for the fourth conquest of Goguryeo, the Sui Dynasty had already revolted and rebelled everywhere, and the domestic chaos became a pot of porridge, and finally he was killed by Yu Wenhua, and Emperor Yang of Sui failed to start his fourth conquest of Goguryeo.

Beisha Fortress either took the sea route and did not land from the southern tip of the Liaodong Peninsula when attacking Goguryeo, or it was a hard attack after the landing.

There's nothing good to do about anything else.

This time, Wu Yuanqing didn't think about what to do with Beisha City first, although Beisha City is strong, but the city only stretches for a long time, but the middle is very narrow, and the defenders are not many, and there are less than 10,000 people. Therefore, as long as they don't suffer from it, the defenders inside can only hold on and can't come out to do anything.

But a wrong step is a wrong step, because the change of plan first hit Liaodong City, which led to great difficulties in attacking Anshi City, and then the losses were quite serious, and then Cheng Chumo and Su Dingfang divided their troops, and their strength was greatly reduced, like Beisha City, and Jian'an City behind Beisha City, the deterrent power of the defenders of these cities was greatly reduced. If the movement was not hindered, these people would not dare to go out of the city to attack, but the movement was blocked.

When Yuangai Suwen coerced the emperor to run to Daxing City with tens of thousands of troops, and Cheng Chu wanted to rush to besiege Yu Chi Baolin, the defenders of Beisha City and Jian'an City combined with more than 10,000 people attacked them from behind.

In terms of combat strength, there are also more than 10,000 people, and the Tang army must have surpassed the Goguryeo soldiers, but in terms of the terrain and topography and the mass base, the Tang Dynasty is not the opponent of the Goguryeo soldiers in any case.

Therefore, after the sneak attack, when Cheng Chumo led his troops to fight back, the defenders of Jian'an and Beisha turned around and ran away.

But once Cheng Chumo and they are about to march to Daxing City, these people will catch up and make a call.

Flies can't kill people, but they can annoy people.

In addition, there were too many troops in Daxing City, and Cheng Chumo thought that he could take Daxing City by himself and Yu Chi Baolin alone, so he simply came back to clean up Beisha first, and the flies that ran out of Jian'an City.

However, Cheng Chumo's pursuit fell into someone's trap.

It's not a man-made trap, it's a naturally formed trap, and that's the terrain in which the city of Beisha is located.

It is completely a long and narrow valley, with continuous primeval forests on both sides, at this time it is in Guanzhong, and the hinterland of the Central Plains is a piece of primeval forest, and it is easy to find it when you go in. Not to mention the more desolate Goguryeo, which was still on the side of the semi-slave society.

There is no hope of attacking Beisha City from both sides, and the price paid for a frontal attack will be very large.

When he was about to retreat, he found that it was not easy to leave even if he wanted to.

Because if you return the same way, it is easy to be chased by the tail, after all, the canyon is so wide, the retreat is completely a long dragon, the enemy chasing from the rear is nothing, the key is that the enemy may send a small force on the slopes on both sides of the mountain to attack.

The brigades on both sides of the hill will not be able to go up immediately, but small people can still go up, and the defenders of Beisha City are stationed here all the year round and are very familiar with the mountain.

And there is a section of the valley out of the valley that is like a pocket mouth that has been suddenly tightened, the inside and the outside are relatively wide, and that section is very special in that it can only accommodate six or seven people side by side, although the distance is not long, only more than two miles, but this distance is enough for the defenders of Beisha City to ambush the archers on it, and place the rolling stone sassalwood.

If the enemy is choked from here when retreating, then more than 10,000 people dare not say that the loss of one or two thousand people is not a problem at all.

If the siege loses these people, Cheng Chumo doesn't feel anything, but the enemy is not injured, just attack when he retreats, and his side will have to pay such a heavy price, Cheng Chumo is not willing to accept it.

Then, Cheng Chumo confronted the defenders in Beisha City here, and he didn't fight or fight.

"Young Master, what should we do, we must go to Wuhou's side, otherwise Your Majesty will definitely punish you." Cheng's family leader, Cheng Cheng, asked behind Cheng with a grim face.

Cheng Chumo looked up at the green mountain that seemed to be black, and after being silent for a moment, he chuckled: "Does it hurt Tianhe?" Yuanqing, it seems that you have a way to hurt the heavens and peace, brother, I have to use it."

Cheng Yi's face was inexplicable, and he didn't know what his eldest young master meant by hurting the heavens.

As if he had unloaded some burden, Cheng Chumo breathed a sigh of relief, and said with a smile: "Go and call Qian Feng, young master, I have something to arrange for you to do."