Qin Qiong and Li Xiu also didn't expect that Quangai Suwen would directly abandon the domestic city, and when they gathered a large army to attack the domestic city, they found that the city was already empty, but on the mountain road from the domestic city to the pill capital city, the Goguryeo people laid a heavy defensive line, and with the help of the geographical advantage, the Tang army failed to make much progress in several attacks.

"These Goguryeo people are all turtles, and they can't come down from the mountains, it's really fucking infuriating!" After another attack failed, Cheng Yanjin couldn't help but scold angrily, after several days of attacking, there was no progress in losing troops and generals, which made him lose patience.

Qin Qiong next to him also had a gloomy face, he had made a military order for Li Shimin before he came, if he couldn't defeat the pill capital, even if Li Shimin didn't blame him for his past feelings, there was no place to put his old face.

Li Xiu was still very calm at this time, from the beginning he had been looking at the Goguryeo people's defense on the mountain, although the Marudu Mountain is not very high, but the mountain is very dangerous, almost all sides are cliffs, there may have been other roads up the mountain before, but later it was all destroyed by the Goguryeo people, only the road in front of him is left.

Perhaps in order to facilitate the transportation of materials to the mountain, so the only remaining road up the mountain is still very wide, not even very steep, but the Goguryeo people divided this road into three sections, each section will have a platform, and now the platform has been built by Goguryeo simple fortifications, and a large number of defensive materials are stored.

It can be said that it took several days, but the Tang army failed to capture the first section of the mountain road, let alone attack the city of Marudu, to put it mildly, even now the Tang army has not been able to see what the walls of the city of Marudu look like, with this progress, I am afraid that even next year it will be impossible to take the city of Marudu.

"Forget it, let the soldiers withdraw, just attacking so strongly is not a way, it will only consume the morale of the soldiers and increase some casualties, let's think about it in the long run!" In the end, Qin Qiong suddenly sighed and said, although he had been mentally prepared for the difficulty of fighting in Pill Capital City before, he still felt a little frustrated now.

Hearing Qin Qiong's order, Cheng Yanjin also nodded helplessly, both of them were famous generals of the Tang Dynasty, but they didn't expect to be blocked by a small pill capital city, which made him angry and hateful, but there was no way.

"General Qin, I also think it's not a way to fight like this, but it's not foolproof that the Goguryeo people completely retreat to the mountain, I think we still have a way to hit the mountain, but I want to investigate the surrounding terrain in advance, and ask the general to send me an escort!" Li Xiu also spoke to Qin Qiong at this time, and at the same time put forward his own requirements.

"You want to see the terrain for yourself?" Qin Qiong couldn't help but hesitate when she heard Li Xiu's words, although the Goguryeo people retreated to the mountain, they were surrounded by deep mountains and old forests, and if the Goguryeo people had another way down the mountain, it would be bad if Li Xiu met each other in the mountains.

"Yes, I heard that there was more than one way up the mountain in the past, and although the other roads were destroyed by the Goguryeos, I still want to see for myself, maybe I can find other ways up the mountain." Li Xiu spoke again at this time.

In this era when there were no construction machinery, and the Goguryeo people had no gunpowder, Li Xiu did not believe that Goguryeo could completely destroy all the roads, as long as the original road could be found, maybe there was still the possibility of repair, and then the Tang army would not have to just stare at the road in front of him.

Hearing Li Xiu say this, Qin Qiong also felt that this method was feasible, and even wanted to check other roads in person, but now that he was the main general in the army, he had a lot of affairs on his body, and it was impossible to stay away from the army, and the same was true for Cheng Yanjin, so in the end, he also nodded and said, "Okay, then everything will be left to the horses!" ”

At the moment, Qin Qiong personally helped Li Xiu select a thousand guards, and the leader of this guard was none other than Xue Rengui, who was picked up by Li Xiu, this time Qin Qiong led his troops to come, and also brought the elite of the Tang army, Xue Rengui shined on the battlefield last time, and now he has been promoted to the position of captain, and this is only a temporary appointment, and he will definitely be reused when he returns to the Tang Dynasty in the future.

"Donkey, it's great to be able to follow you out, it's not going well these days, and the barracks are also very depressed, I also want to come out to see if there are other roads!" Xue Rengui rode a horse next to Li Xiu, and said with a smile at the moment, he had already seen that it was too difficult to go up the mountain from the road in the domestic city, so he also thought of going with Li Xiu.

"Hehe, Marudu City is indeed not easy to fight, and Quangai Suwen has shrunk all his troops into Marudu City, making it clear that he wants to fight to the end with us, plus this is the nest of the Goguryeo people, so it is normal that it is not easy to fight." Li Xiu couldn't help laughing at this time, he also saw Xue Rengui's performance during this time, and Li Shimin also praised the other party in front of him more than once, so Xue Rengui must have a bright future in the future, and this finally lived up to his previous hard work.

"Actually, I have an idea, that is, to use hot air balloons to fly a group of death squads to the world, and then fall behind the Goguryeo people on the mountain road, and then kill from the top down, it must be much easier than us from the bottom to the mountain." Xue Rengui suddenly put forward another idea of his own at this time.

"This method is good, but it is too difficult to implement, first of all, a hot air balloon carries a small number of people, and the hot air balloon cannot control the direction and landing location, so that even if hundreds of hot air balloons are sent to fly into the sky with thousands of people, in the end they don't know where they fall, and they can't be gathered at all." Li Xiu shook his head when he heard this, even in the later generations, the gathering of the airborne troops after landing is a big problem, of course, Xue Rengui can have such an idea, which is also very encouraging.

"I've thought about what the colt said, but I haven't come up with any good solutions, so I'm more inclined to find another way up the mountain." Xue Rengui also smiled when he heard Li Xiu's words, the reason why he said this method was actually to let Li Xiu think of a solution to the problem of gathering after landing, but now it seems that Li Xiu has no choice.

As they spoke, Li Xiu and Xue Rengui also left the domestic city, and then walked along the foot of Marudu Mountain, hoping to find another way up the mountain.