However, this time, I was able to win the Shiyan Pass so smoothly, thanks to the stone grease water that I got from Yan'an County, that is, oil. It was tried and tested, and it quickly found its best use. Moreover, according to its characteristics and with reference to the kind of water hose used for fire extinguishing, the people in the ordnance industry department have specially developed such an instrument.

The small cars, the iron pipes on them, are actually amplified and strengthened a lot of water dragons. It's just that what comes out of it~ is not an ordinary stream of water, but oil.

If the general siege method is used to tackle the fortification, it is obvious that even if the Guancheng is successfully captured in the end, the Tang army may pay a lot of casualties because of this. And if this method of fire attack is used, the casualties will be on the side of the Yan army.

But Li Xin's approach is still different from Murong Trai, because Murong Trai has no way to leave a way out at all. However, these Yan soldiers on Shiyan Pass can escape from the Guancheng and stay away from the burning Guancheng.

As Li Xin said before, Shi Yanguan was taken before dark. Then, except for leaving some soldiers and horses to clean up and guard Shiyan Pass, waiting for the follow-up soldiers and horses to take over, the large army immediately marched towards Tumen Pass.

The fire in Shiyan Pass can be seen at Tumen Pass, which is only about ten miles away from it. But for the defenders of Tumen Pass, they didn't know what was going on there.

It wasn't until Yang Lu and the other soldiers who had fled from Shiyan Pass arrived that the Yan army, who was guarding Tumen Pass, knew what was going on there. But at this time, they no longer had time to adjust the deployment, because the Tang army was already less than two miles away from Tumen Pass.

"My lord, what shall we do? If Tang Jun uses that oil again, we will definitely not be able to resist it! If we stay at this earthen gate, I'm afraid we will be dead! The generals who fled back with them asked Yang Lu.

Hearing this, Yang Lu was also very helpless, because for a while, he had no better way to resist the Tang army, especially the kind of fire oil that could not be extinguished. As long as he thought of the situation when Shi Yan closed the door and burned to a piece and quickly turned into a sea of fire, he shuddered.

"That's it, give up Tumen Pass, the whole army immediately rushed to the east of Tumen Pass, gather all the troops, and prepare for a decisive battle with the Tang army!" After thinking about it for a while, Yang Heron thought of only one way.

There were still more than 20,000 troops east of Guancheng, and there were 23,400 people with these evacuated men. And the Tang army behind seems to be only about 20,000 people. Instead of going to death around the wall, it is better to fight a hard battle directly, and there may be more chances of winning.

After all, if a big battle is fought in open terrain, those water dragons and fire oil of the Tang army will not be useful. After all, the wall is dead and will not move, and he is a living person, and it is impossible for Tang Jun to slowly prepare for it.

"This ...... Alas, the last will go and give the order! Hearing this order, the surrounding generals couldn't help but be stunned for a moment, and then responded helplessly.

Because everyone knows that it is not necessarily possible to win against the Tang army with superior forces, let alone when the forces of the two sides are equal. I used to think about blocking the other party with the high wall, but now it seems that it will not work at all.

But in this situation, no one has a better way than this last resort.

Soon, the Yan army, which had received the order, completely sealed the Tumen Pass, and then withdrew to the large camp to the east.

Soon, Li Xinqin led a large army to Guanxia, only to see torches, lanterns, flags and other things on the Guancheng, but he could not see a single Yan soldier. Seeing this scene, Deng Qiang, the general of the former army, couldn't help but become cautious, and hurriedly stopped the army and sent someone to report to Li Xin.

Li Xin, who got the news, came to the front of the army, looked at the earthen gate in front of him, only felt that there was silence in it, and couldn't help frowning.

"Send a few up there to see what's going on!" After thinking for a moment, Li Xin ordered.

He didn't know if there was an ambush of the Yan army inside, or if there was some other conspiracy, so the necessary investigation was still needed. It is said that the arrogant soldiers will be defeated, and they can't relax their vigilance just because they easily won Shiyan Pass before.

He didn't expect that Yang Lu would directly make the decision to withdraw the army, after all, the importance of Tumen Pass to the Yan army can be imagined. So, although I have such a guess in my heart, I am not sure.

It wasn't until the scouts sent to climb in from outside the city that they finally got accurate information and learned that Shimen Pass was now just an empty city.

If this is the case, then naturally there is nothing to be polite. Even though Li Xindang ordered the city gate to be opened, the army entered the Tumen Pass. Then, while sending more scouts around to inquire about the situation, the army was allowed to rest on the spot for a while.

After dawn, all the news was reported, and Li Xin learned that Yanglu and the others were already waiting for them less than twenty miles east of Tumen Pass, blocking their way east.

"Yang Lu is really decisive, and he actually gave up Tumen Pass directly and chose to fight with us in the east. In this case, it is a good idea! Unfortunately, no matter what he chooses, the result will be the same! Zhang Oy, the Chinese army is handed over to you to lead, responsible for attacking the Yanglu army from the front. Hong Yi and Deng Qiang, the two of you each lead the flying dragon rider to outflank from the left and right wings, and you must catch them all! After listening to the scout's report, Li Xin chuckled, but the next moment he gave the order with a serious expression.

"The last general obeys!" Zhang Oy, Deng Qiang and others immediately responded.

Soon, the army set off out of Tumen Pass and rushed towards the Yan army in the east. Halfway through, the Wyvern Rider had gradually split into two groups, and the left and right flanks of the unbroken army flanked the enemy.

Half an hour later, the armies of the two sides officially met in the open area east of Tumen Pass. Yang Lu lined up an army of more than 20,000 people into a long phalanx, and it didn't seem to have the intention of taking the initiative to attack.

In this case, Li Xin was not polite, and directly ordered someone to beat the war drums of the attack, and the army killed the Yan army on the opposite side like a torrent.

There was no suspense in this battle, and there were no miracles. Under the unbroken sword and crossbow, the iron hooves and spears of the flying dragon riders, the army of Yang Lu was completely destroyed in just one hour.

Fleeing to death, surrendering to surrender, the weak soldiers of the Yan army, who were already full of fear of the Tang army, can stop the most elite troops in the Tang army. Except for a small number of people such as Yang Lu, who fled, more than 20,000 people were really wiped out.

However, it was not that this battle was completely devoid of benefits for the Yan army, as it at least bought Yang Lu a certain amount of time to send a messenger to inform Murong Chui.

Since the decision to evacuate at Tumen Pass, Yang Lu himself has already realized that this time the big battle is very likely to face defeat. Therefore, while he retreated, he sent a fast horse to inform Murong Trai first, so that he could make preparations first.

Tumen Pass to Boling County Zhiping County is about 200 miles, and it only takes one night to arrive under the fast horse. Therefore, when the battle outside Tumen Pass was about to start, Murong Chui happened to get the news.

"What? Shiyan Pass and Tumen Pass only worked for one night, and they all fell into the hands of the Tang Army? Murong Chui, who heard the news, stood up from the couch in shock.

He was expecting that place to block the Tang army in the west, but now that he got this, it was like bad news. Although the messenger also brought the news that Yang Lu organized an army to fight a decisive battle with the Tang army, Murong Chui didn't seem to take it to heart at all.

"The special costume is different from the ordinary Tang Army soldiers, this is by no means an ordinary soldier. If it is as expected, it must be the two pro-army under Li Xin's command who have arrived. In this way, it should be Li Xin who personally led the army out of Jingcheng and attacked Shiyan Pass and Tumen Pass! "Unlike Yang Lu, Murong Chui has dealt with the Tang Army many times, and his military sensitivity is much higher than that of Yang Lu. So, when I heard this, I realized that the situation was not right.

"However, the Tang army has not seen Li Xin's Daxu and honor guard!" The messenger reminded.

"Stupid, if Li Xin has the intention to hide his whereabouts, how can these things appear? If he really fights these things, let everyone know that he led the army to attack Shiyan Pass and Tumen Pass, we will definitely deploy heavy troops there to stop him! Even if it's this king, he has to rush to Tumen Pass to take the town! Alas, I really regretted my mistake for a while! Hearing this, Murong Chui couldn't help but say angrily.

The affairs of the military family are originally a matter of deception, and if everything is clearly put on the table, it is definitely not the work of a good general.

"No, although Yang Sikong has 20,000 troops in hand, he is definitely not Li Xin's opponent, and he may have been defeated at this time. If there is no barrier in the area of Changshan County in the west, this king will definitely not be protected here, and he must find a way to deal with it! Thinking of the critical situation, Murong couldn't help but ponder.

It was with great difficulty for him to set up these two lines of defense, and if there was a breach in one place that could not be repaired in time, the entire line of defense would soon collapse completely.

The most important thing is that because his army is arranged between the water and the water. If Li Xin led his army to the south bank of the Yutuo River first, it would mean that his army of nearly 200,000 would be completely blocked by the Tang Army in the narrow strip between the two rivers.

When the time comes, unless it is Yecheng and other places in the south of Tuoshui to rescue themselves. Otherwise, his side will inevitably be slowly dragged to death by the Tang Army. After all, there are so many soldiers and horses here, and just the things that people eat and chew on horses are an unimaginable number.