Since the frequent movements of the two sides on the border, the attention of public opinion has changed from the assassination of Wei Dan to the Tang-Tu war. "The History of Chunming Dynasty" and "This Spring and Autumn" both reported on the war, and "This Spring and Autumn" also sent two writers to the battlefield to understand the situation, I don't know if this is the first batch of war correspondents in history.

Of course, this envoy of Tibet sent to the Tang Dynasty not because of the current state of quasi-war between the two sides. In fact, as early as after the Tibetan New Year, the Tibetan Zanpu summoned this envoy. Since the new Zampu succeeded to the throne the year before last, all his energy has been focused on consolidating his rule and reconciling the contradictions between his own religion and Buddhism, of course, when he reconciled, the new Zampu was biased towards Buddhism, which led to the fact that Xin Zampu had to spend more energy on consolidating his rule. Therefore, since the succession to the throne, Xin Zampu has been seeking reconciliation with his uncle in the Tang Dynasty, and this effort began before Xin Zampu and before Xin Zampu (as explained above, two Zampu were assassinated in more than a year in Tibet). However, due to the bad influence of the Pingliang Tribulation Alliance, Dezong has always refused to negotiate peace with Tubo. (The Pingliang Raid is a famous event in Chinese history, referring to the incident of the Tubo armed robbery of the alliance that occurred when the Tang Dynasty and the Tubo met in Pingliang.) On May 15, 787, the Tang Dynasty met in Pingliang. Shang Jiezan ambushed the cavalry in the west of the alliance in advance, preparing to rob the alliance. Before Hun Xuan set off, Li Sheng warned him that this meeting was unusual and that he must be strictly guarded; But Tang Dezong ordered Hun Xuan not to suspect the other party, but to show the sincerity of the alliance. As a result, the two ends of the first rat are inconsistent. Before the start of the alliance, Hun Ying and others were invited by Shang Jiezan to withdraw their armor and enter the curtain in dresses. At this time, the ambush soldiers of the Tubo army swarmed from all sides under the order of beating the drum, Hun Yang realized that he escaped from behind the scenes, and broke through on horseback, and more than 60 officials of the Tang Dynasty Alliance from Cui Hanheng were all detained, and the rest of the entourage soldiers were all killed. In this raid, more than 500 people were killed and more than 1,000 were captured. Shang Jiezan plundered the neighboring counties again, and then retreated to the territory of Qingshui County. After the Pingliang Robbery Alliance, Tang Dezong deeply regretted his mistake of insisting on the alliance with Tubo, and the Tang general Ma Sui, who pleaded for Shang Jie's peace and said that he was also dismissed from military power by Tang Dezong. Shang Jiezan's attempt to get rid of the three generals in the northwest of the Tang Dynasty finally succeeded. However, after more than 30 years, the Tang and Tibet failed to make an alliance, and it was not until 821 A.D., the first year of Tang Changqing and the seventh year of Tubo Yitai that the two sides made peace again. Cite content, not counting words. After Li Yu succeeded to the throne, the Tibetan envoys came to Chang'an once a year, but the uncle and emperor of the Tang Dynasty never gave a good face.

On the border, the Tibetans were the first to stop their offensive. This is due to Zampu's sincerity. * Also not aggressive, stop and rest to build the city. The direction of Jingyuan is really as Hao Wei said, and the Linjing City built last year has really become the base camp of logistics supply.

*Now that the strategic goal has been achieved, it is indeed possible to talk to Tibet about peace. However, before talking again, Li Yu left the Tibetan envoy dry for nearly a month, and only then did he reluctantly express his willingness to negotiate peace, at the repeated request of the Tibetan envoy. During this period, the ministers above the squire received gifts such as cordyceps sinensis from the Tibetan envoys. During this period, an annual tragic drama of filial piety saving his father was also staged, which became the material for legendary creation.

In the Pingliang Alliance, the deputy marshal judge Lu Mi and the alliance judge Zheng Shuju were not in Tubo. During the first emperor, Tubo asked for peace and promised to return Lu Mi, Zheng Shuju and other officials who were detained by Tubo. After Lu Sui's son heard about it, he went to the palace gate three times to cry and ask Dezong to allow Tubo to negotiate peace in order to save his father, but Dezong refused because of Tubo's cunning and untrustworthiness. This time, Tubo asked for peace again, and Lu Sui, who got the news, went to the prime minister's house five times in a row, and then ran to the prime minister's house to cry and ask for permission to negotiate peace with Tubo. Lu Sui's deeds quickly moved the government and the opposition, Pei Yan and Li Fan both persuaded the emperor to negotiate peace, Li Jifu and Yu Di played the role of villains, and if Chen Tubo was weak, he would ask for peace, and if he was strong, he would raise troops, and he should not be gullible. However, the deeds of filial piety are still very tear-jerking, and it is said that even the queen was moved by it. When the news of the emperor's approval of peace came out, all those who cared about Lu Sui breathed a sigh of relief, as if the war between the two countries was all for him.

The discussion and main discussion sent by Li Yu was commonplace. Originally, Yu Di was supposed to go to the river to Jinjiang to temporarily act as an envoy, but Li Yu thought about it again and again, but he still left Yu Di. The envoy of the Jin Dynasty in the river was held by the king of Jingzhao Yin, while the king of Jingzhao Yin was held by Xu Mengrong. Xu Mengrong is a talent, but Han boldly covers the Jingzhao place, and there are not too many places for talent.

In terms of public opinion, Yu Xianggong is a person who resolutely opposes peace talks. It seems to be able to explain to Lu Sui and public opinion, but also to make them desperate. Sure enough, Yu Xianggong's first words to the Tibetan envoy were:

"Why does Tibet want to negotiate peace?"

When the Tibetan envoy talked about the will of God and the compassionate heart of Zampu, and the love of peace in Tibet, Yu Xianggong coldly threw out a sentence:

"In that case, then your country should have made an alliance with our country twenty-two years ago, why did you rob the alliance twenty-two years ago?"

The Tibetan envoy did his homework before he came, and immediately replied:

"That's because the then Prime Minister Shang Dongzan made his own decisions, and the first emperor of the Tang Dynasty did not fulfill his promise to the Great Tubo and ceded Beiting and Yixi to our country."

Yu asked:

"Why did my Datang cede the two places to Tibet?"

Tibetan Emissary:

"Because the Great Tubo helped the Tang Dynasty recover Chang'an from the rebels."

"How much did you help?"

"••••••, Yu Xianggong, let's talk about the matter in front of us."

Yu Di did not give up on what happened twenty-two years ago, and said:

"Since it is Shang Dongzan who makes his own opinion, then please use Shang Dongzan's head to show sincerity! Otherwise, how could the prime minister confess to the officials and soldiers who died and were captured 22 years ago? ”

The first meeting between the two sides broke up unhappily, but the Tibetan envoy was broad-minded and persevering, and if it didn't work once, he would come again. Finally, when the news of the famine came from Huaixi, the two sides reached an agreement. Tubo returned the Tang Dynasty officials who had been detained, ceded the land of the four states to the Tang Dynasty for a certain amount of money, and the two sides called off the army and negotiated peace. This condition was twice as high as the original condition in Tibet, and the Tang Dynasty gave up the requirement to dig up Shang Dongzan's bones and cut off his head.

At the beginning of May, according to the requirements, each side withdrew thirty miles, and in addition to the border forts, the main forces of the Tu army retreated. The Tang Dynasty sent the ancestral hall Langzhong Xu to return to Tubo, and at the same time detained the deputy envoy of Tubo and half of the attachés as hostages. When Yu Yan reported the results to Li Chen, Li Chen was surprised for a long time, and the Chinese after the nineteenth century really could not imagine that their country would be so strong at the negotiating table. Li Yu wanted to say, I am proud to be the emperor of the Tang Dynasty.

However, Wu Shaocheng, who was far away in Huaixi, didn't think so. Wu Shaocheng hated the Tang Emperor to death. also hated the crown prince of the Tang Emperor. Originally, the purpose of the prince's exit from Tongguan was to inspect the drought situation in Jianghuai. Unexpectedly, not long after Wei Dan's assassination, a rain fell from the sky, the drought eased, and the prince naturally stayed in Luoyang. Even if he stayed in Luoyang, the prince frequently went out of Luoyang to inspect various towns. The garrison near Luoyang also comforted the prince. It is said that the prince said very openly in Wu Chongyin, "The king is going south, leveling the thieves, and clarifying Yuyu". In the past few months, it has become a foregone conclusion that Wang Shi will re-enter the Central Plains.

Due to the tight defense of Anhuang, Chenxu, Shannan, Eyue, Jinshang and other towns, the routine raids in Huaixi every spring were not as effective as in previous years, although the scale was increased. Under the pressure of more than 100,000 troops around the border, Huaixi's food had to guarantee the army, and the army not only did not shrink, but expanded by 20,000 people. Huaixi is now almost a soldier per household. As a result, the phenomenon of starving people who had not been seen for several years appeared in Huaixi. A large-scale absconding of households appeared in Huaixi. And public opinion is becoming more and more unfavorable to Huaixi.