On 21 August, Li Baoyu led his army to cross the Yalu River, cross the area north of the Taedong River controlled by the Tang Army, and arrived at Pyongyang City on 27 August after a six-day march.

After Emperor Xuanzong gave the area south of the Daedong River to Silla, the Andong Metropolitan Protectorate was withdrawn to the Liaoxi county town on the Liaodong Peninsula, and then the Anshi Rebellion broke out, and in 761 AD, the Andong Metropolitan Protectorate was abolished.

After a short rest in Pyongyang, the army began to attack the Hanju area controlled by the Silla State, and Li Baozhen had the information of the Silla army's troops in the Hanju area and the information of the army commander, and with the cooperation of Kim Jingxin, a senior official of Silla, the offensive momentum was like a bamboo, and soon successively captured Hanzhou, Mingju and Shuozhou, which were the birthplaces of the former Goguryeo State, and after the loss of these three states, the strength of Silla was greatly reduced.

At this time, Wei Boyu had already led the army to land in Xiongzhou, but because he was not familiar with the deployment of troops in Silla and did not understand the local situation, the attack was slow, and there were still many losses, but Li Baozhen quickly ordered Hun Ying to lead the army south to open up the connection between the Northern Route Army and the Southern Route Army, so that the two Tang armies could meet each other in the north and south and act as horns for each other, and the 100,000 army brought panic to the Silla government and the opposition on the territory of Silla, especially the Tang Army on the North Route attacked rapidly, as if it could always find the weak point of the Silla Army's defense to attack, From time to time, he used roundabout tactics to copy the back of the Silla army, and successively surrounded and annihilated several Silla armies, which greatly damaged the strength of the Silla army.

Zhao Ziliang was quite satisfied after receiving the war report, and issued an order to the Chang'an court to ensure the supply and supply of the two armies in the winter battle, and also ordered the naval fleet to destroy the poor sailor ships of the Silla Kingdom.

"Well, it's well written, just send it to Chang'an like this!" After reading the edict just drafted, Zhao Ziliang instructed Du Zongwen.

Du Zongwen promised: "Yes, king!" ”

Du Zongwen is Du Fu's eldest son, and Zhao Ziliang saw that he was quick-witted, had the ability to remember and write quickly, so he recruited him to be the edict of Hanlin for drafting edicts and discussing current affairs.

Zhao Ziliang remembered something, sent someone to find Wang Can and asked, "How are the affairs of the Bolgar Khanate?" ”

Wang Can said: "It's ongoing, autumn is the season of autumn high horses and fattening, and the northern barbarians generally choose to raid the south at this time, I think our people over there have officially begun!" ”

"There's news to report immediately!"

"Yes!"

Eastern Roman Empire, Thrace, Adrianople.

After a bitter battle, the Bolgar Khan, King Trilig, led the Bolgars to finally break through Adrianople after suffering more than 2,000 casualties. This castle was originally a gathering place of ancient Thracians, and it was rebuilt on the site of the Roman Emperor Hadrian, called Adrian Fort, and because it was built by Hadrian, it is also called Hadrian's Fort, which is now the gateway to the western part of Turkey, Edirne.

In Adrianople, Trilig and his men, the warriors, were eating meat, drinking wine, and telling unpleasant jokes from time to time, and they didn't care about the smell of blood all over their bodies.

In the middle of the night, everyone was drunk and fell asleep on the ground one by one.

In a daze, Trilig suddenly felt that someone was slapping him, and he was extremely alert, and he immediately turned over, and in the process, he had already pulled out his waist knife, only to hear a person holding his arm and whispering: "King Khan, it's me!" ”

Triglig shook his head, and finally saw the other party clearly, it turned out to be one of the tribal leaders, Fatli, he frowned and said, "Fatli, weren't you drunk just now?" ”

"Shh Fatley put his finger to his lips and motioned for Terley Rig not to speak, then shook his head outside, and the two of them walked out softly, one after the other.

Butter lamps hung in the corridor outside the door, crackling from time to time, and the people came through the corridor made of stone to a secluded place, and Fatli whispered: "King Khan, I have received news that the news of our dispatch of troops was leaked two months ago, and now the Eastern Romans have already laid out their pockets in front of us and are waiting for us, and they have also sent an army to cut off our retreat!" ”

Hearing this, Tririg was completely drunk, and he broke out in a cold sweat, and the wine continued to flow out of his body along the sweat, and he immediately pulled Fatley aside and asked, "Where did you get the news?" Who the hell leaked the news of our troops?"

Fatli hesitated, looked left and right, and said, "King Khan, I have spies in Constantinople, and the spies have passed the news. This Adrianople has an underground passage to the outside, very hidden, the plan of the Eastern Romans is to wait for us to leave a small number of people here, after the large group of men and horses to the east to continue to attack the city, an Eastern Roman army will land from the Black Sea, and then surround here, from the secret road to occupy here, in this way, our back road is cut off, plus the front by the Eastern Romans ambush, will inevitably suffer heavy losses, the army is disheartened, when the time comes, there is no way forward, there are chasing soldiers, there is no way to the sky, there is no way to enter the ground! ”

The cold sweat on Trilig's body kept flowing down, and he immediately remembered the secret passage, and immediately asked, "Where is the secret passage?" Where's the secret passage? ”

Fatli looked left and right, and said to Fatlig, "King Khan come with me!" ”

The two walked to the castle one after the other, passing through the corridors, the narrow stone staircases, and the fortresses and arrow towers. Most of the Bolgar soldiers were lying on the ground in animal skins, these people killed people, drank wine and ate meat, and did not delay any time, defecating and defecating everywhere, lying down on the spot when they were full and drunk, snoring one after another, all kinds of fishy smells and fishy smells permeated everywhere, these people did not cut their hair, did not take care of their beards, did not cut their nails, they were all complete savages.

The two soon came to an old wooden house in the northeast corner of the castle, which was full of debris, and Fatli pushed the door in, and removed a pile of rotten wood, only to see a square plank laid on the ground, and he lifted it, revealing a large black hole in the ground, which seemed to be bottomless in the darkness, as if endless danger was gushing out at any time.

"This is it!" Fatli pointed to the black hole on the ground and asked, "King Khan, do you want to go down and have a look?" ”

Tririg nodded with a serious expression: "Go down, you lead the way in front!" ”

Fatley didn't say a word, lit the two torches next to him, handed one of them to Trilig, and walked down the stone staircase at the entrance of the tunnel with a torch, the stone staircase was not long, only about ten meters to the end, the two of them felt depressed and dull when they stepped on the ground of the tunnel, the air here was obviously not very good, but there was a little, there was the fragrance of earth in the air.

Fatli walked ahead, and as he went, he asked, "What did the Khan smell?" ”

"I don't smell anything else, but there's the smell of fresh earth!" ”

"That's right, it's the smell of fresh earth, it took the Eastern Romans two months to dig this tunnel, you see, they are obviously not good at digging tunnels, digging too roughly!" Ever since they heard the news that we were going south to plunder, they began to send people to dig this tunnel here, and they dug it for two months, and I heard that they got the idea of digging the tunnel from the Easterners! ”

There was no place for this secret passage to turn around, a road led to the end, and it took about ten minutes to reach the end, in the woods in the dark night, with the sound of Si Xi Suo, a piece of turf was lifted, and a head came out of the ground, and the light was faintly revealed from underground, and then the torch stretched out from the mouth of the tunnel to disperse the surrounding darkness, and Fatley jumped out, followed by Terri Lig.

"The woods? Where is this? Tririg held up his torch and looked at the towering trees all around, and said in surprise.

"This is supposed to be the woods northeast of the castle, and we have just walked for about a quarter of an hour, and the castle is exactly a quarter of an hour away from the woods to the northeast," said Fatley.

Trilig looked around with a torch and couldn't do anything, but he saw many footprints, which must have been left by the man who had dug the tunnel.

"Go, go back the way you came, and restore the exit to its original state," said Terririg, turning and walking into the tunnel, Fatley followed him in, then turned and moved the turfed planks over the tunnel, and darkness reigned again, and the woods were calm again.

The two returned to the castle and walked out after restoring the entrance to the hut, and Tellarig stood still and asked, "Tell me, Fatley, who betrayed us?" ”

Fatli hesitated for a moment and said: "King Khan, I know who this person is, but I have no evidence, if I say it, I am worried that it will affect our internal relationship as brothers, so don't embarrass me!" ”

Trilig turned around and looked at Fatli and said coldly: "Fatley, I know you don't want our own people to kill each other, but you should also know that if we don't catch the inner ghost, all our actions will be known to the Eastern Romans, and we will die more clansmen and brothers, I am the Khan of the Bolgars, I must be responsible for all the clansmen, I can't let the clansmen suffer huge losses because of my stupidity and ignorance, tell me, who is this person?" ”

Fatley took a deep breath and said, "Grande! ”

"Is that him?" Tririgue was taken aback immediately, and then his face became extremely ugly, his chest rose and fell sharply, obviously extremely angry, and the anger was forcibly suppressed by him, and once it broke out, it would be extremely terrifying.

Triig calmed down for a moment and asked, "Fatley, you've always had a lot of ideas, what do you think we should do now?" There aren't many people I can trust now, but you're definitely one! ”