As early as the beginning of the defeat and wounded return to Zihe Town, Yang Jian, the ancestor of the Sui Dynasty, on the day when he received the military report urgently sent back by Yang Liang, the king of the Han Dynasty, from Bingzhou, did not even bother to participate in the banquet held in Zhengyang Palace on the winter solstice to celebrate the destruction of the "Wild Goose's Nest".

However, although the Turks had a tradition of brother to brother, Yang Guang and Gao Ying and others had a big disagreement on the question of how to support Chu Luo Yu to inherit the throne.

Yang Guang advocated that Yang Liang, the king of Han who had left the town and merged with the state, represented the imperial court and took the opportunity to convey to the photo that the Sui Dynasty wanted to support Luo Yu to inherit the throne on the pretext of going to Zihe Town to visit his illness.

However, Gao Ying believed that despite the repeated dissuasion of the imperial court, he brazenly sent troops to invade neighboring countries, resulting in the defeat and injury of the army, and if the imperial court assigned the vassal king in the north of the town to visit the sick at this time, it would inevitably be suspected of harboring and conniving at his behavior of sending troops to invade the Khitan. On the matter of who will succeed to the throne after the death of the photogram, Gao Ying advocated that it is better to use the power of the Turkic Kehe Dunyuwen Praruo, who has the surname Guizong and recognizes Yang Jian as his father, to convey the will of the Sui Dynasty to the photograph through her, and persuade the setu to take the initiative to pass the Khan to the throat.

Comparing the two, Yang Jian thought that Gao Ying's proposition was more clever and more realistic, so he immediately ordered Yang Liang to act accordingly.

Without waiting for Yang Liang to receive Yang Jian's will, he sent someone to Zihe Town to contact Yuwen Panruo, and he had already swallowed his breath when he took the picture, and by mistake, according to the most expected result of the Sui Dynasty's monarchs and ministers, he passed the throne to Chu Luo, who had always been close to Sui.

After Yang Jian received Yang Liang's latest report just after New Year's Day of the following year, Long Yan Dayue immediately ordered Yang Liang to go to Zihe Town to express his condolences for the death of the photo, and at the same time met with Mohe Khan to explain to him that the Sui Dynasty did not want to see another war between the northern states, so as to prevent him from raising troops to seek revenge against the Khitan.

Since the truth about the crown prince Yang Yong's unauthorized expansion of the six rates of the East Palace was revealed, rumors about the imminent appointment of Yang Guang, the king of Jin, as the commander of the war against Chen, have been circulating inside and outside Chang'an City, especially in the short period of a few months when Yang Guang returned to the dynasty from the state and was reappointed as the pastor of Yongzhou, he solved the "wild goose's nest" case of Nanchen that had been pending for many years in one fell swoop, and eliminated the elbow and armpit trouble for the imperial court.

However, for some reason, from the five years of the emperor's reign, the Eastern and Western Turks successively bowed down to the Sui Dynasty, until the early seventh year of the emperor's reign, when the case of Nanchen's "Wild Goose's Nest" was cracked, and the Eastern Turkic pro-Sui Mohe Khan succeeded to the throne, and the imperial court never issued an edict to raise troops to attack Chen, which also made the Sui Dynasty's ministers and soldiers, who had long had the heart of restoring the unification of the north and the south in one fell swoop, couldn't help but write letters one after another, telling the emperor the necessity and urgency of fighting Chen, and urging the imperial court to raise troops to attack Chen as soon as possible.

Among the government and the opposition, only a handful of princes and important ministers such as Yang Guang and Gao Ying knew that the real reason why Yang Jian had not issued the edict of Chen for a long time was in two aspects:

First of all, the situation in the north as the largest force to contain the Sui Dynasty was not stable enough, first due to the existence of sabotage forces such as the "Wild Goose's Nest", coupled with the imperial court's implementation of the Great Suo Maung Yue, and the need to maintain the situation of civil stability (in fact, it was not until the imperial court adopted Changsun Ping's suggestion to establish a community warehouse among the people in the sixth year of the emperor's reign, and the contradictions between the Guandong and Hebei regions and the local wealthy who occupied a large amount of land tended to ease due to the fact that the imperial court had no land to grant), and then because of the potential most unstable factor in the north- The changes in the Eastern Turkic country, the defeat and death of Sha Bolu Khan in the east, and the fact that Mohe Khan had just succeeded to the throne not long ago, it remains to be further observed whether the Sui Dynasty can maintain its usual friendly attitude, all of which determined that it was not yet convenient for Yang Jianzhi, the ancestor of the Sui Dynasty, to draw the main army from Hebei to the south to attack Chen during the period.

Secondly, at the turn of the autumn and winter of the sixth year of the emperor's reign, when Yang Guangbao asked Yang Jian to deal with all the members of the "Wild Goose's Nest" who were arrested, he reminded his father in person that in the first two or three years of the Sui Dynasty, all the spies of Nanchen who were seized by the Sui Dynasty were issued clothes and horses by the imperial court and sent back to Nanchen to show leniency. This time, can the members of the "Wild Goose's Nest" who have been arrested also follow the same example, and adopt a lenient approach to deal with a considerable number of those whose crimes are not so serious? However, Yang Jian categorically rejected Yang Guang's proposal and beheaded more than 5,000 people indiscriminately.

Afterwards, Yang Guang was reminded by Zhang Heng to get a glimpse of the real reason why his father acted like this: to behead more than 5,000 Nanchen Xizuo, he could test the reaction of the Nanchen court to this, and lure Nanchen to take the initiative to attack the Sui Dynasty, so as to provide a pretext for the Xing army to attack Chen.

But to the surprise of almost everyone, Chen Shubao, the queen of Nan Chen, didn't know what he was busy with all day, and he didn't make any decent reaction to the more than 5,000 Nan Chen fine works who served him were all beheaded and killed by Sui Gaozu Yang Jian. This also made Yang Jian's plan to lure Nan Chen to take the initiative to attack the Sui Dynasty and avenge the more than 5,000 people in the "Wild Goose's Nest", so as to find a suitable excuse for raising troops to attack Chen.

In order to eliminate the unstable factors from the eastern Turks in the north as soon as possible, Yang Guang asked his father, Emperor Yang Jian, to send the Turkic prince Dyingan, who had been in the Sui during the reign of Sha Bolu, to return to China just after the New Year of the seventh year of the emperor's reign.

After soliciting the opinions of Gao Ying, Yu Qingze, Changsun Sheng and others, Yang Jian decided to adopt Yang Guang's suggestion and transfer Changsun Sheng back from Qinzhou to personally escort Dye Gan back to China as an envoy of the imperial court.

As Yang Guang expected, after receiving the news that the Sui Dynasty had released his son Dyegan to return to China, Chu Luoyu did not wait for the eldest Sun Sheng to escort Dyegan back to the Turkic country, that is, he went to Bingzhou to meet Yang Liang, the king of Han, and paid tribute to the Sui Dynasty 3,000 war horses as a reward for the Sui Dynasty's release of Dyinggan, and took the initiative to make it clear to Yang Liang that he would make peace with the Sui Dynasty for the rest of his life and swear to be friendly with the Sui Dynasty and never meet with the Sui Dynasty.

After receiving the personal promise of Luo Yu, Yang Jian immediately issued an order to transfer 150,000 troops from Youhe and other places to the south in batches to supplement the subordinate military strength of Xingtai in Huainan Province, and prepare for the army to attack Chen.

At the turn of the spring and summer of the seventh year of the emperor's reign, the rebellion of the Later Liang clan planned and instigated by Xiao Rushui, the absconding "Wild Goose's Nest" protector, provided the Sui Dynasty with a sufficient reason to raise troops to attack Chen, and finally became the direct fuse of a war of annihilation that had never been seen in three hundred years.