After Yang Xuangan was destroyed, he stopped for more than half a year, and at the beginning of 614, Yang Guang once again issued an edict to conquer the world to prepare for the third attack on Goguryeo.

Gao Buer, who was far away in Hangzhou, also received an order from Yang Guang to lead his troops north, but Gao Buer had already received the news that Yang Guang was going to transfer him to the war, so he went to sea on a newly built sea ship before the arrival of the holy decree, and he couldn't find anyone else for a while, and the time limit given by the emperor was short.

In March of the same year, Yang Guang arrived in Zhuozhou, and the recruited army fled countless times along the way, although Yang Guang killed hundreds of deserters, but the escape still happened from time to time.

In June of the same year, when Yang Guang arrived in Huaiyuan Town, the rebel armies from all walks of life in the Central Plains broke out, and the entire Central Plains fell into a melee after more than 20 years of peace.

Due to the domestic rebellion, most of the troops recruited by Yang Guang dispersed before they arrived, and at this time, Goguryeo also had a famine.

Yang Guang sat in the big tent of the Chinese army, listening to the minister's report on the arrival of the troops requisitioned from all over the place, although there were many debts, but Yang Guang did not care about any responsibility at this time, in order to prevent the army from breaking up. Yang Guang ordered: "Come and protect your child." ”

"The minister is here." Come to protect the children.

"I order you to be the vanguard, to command an army of 100,000 people, and to take Pyongyang directly."

"The minister obeys the order, he will capture Pyongyang when he goes, and take the head of Gao Yuan's child and dedicate it to the emperor."

The first two attacks on Goguryeo were all to come to Hu'er as a pioneer, with more wins and fewer losses, so Yang Guang trusted Lai'er very much, and this time he still sent him as a pioneer.

Laihu'er really lived up to expectations, and soon defeated the main army of Goguryeo at Bihao City, and when the good news came, Yang Guangguang feasted his ministers to congratulate him, and ordered Laihu'er to continue to march into Pyongyang as planned.

When the Goguryeo monarchs of Pyongyang heard the news of the defeat of the army, they fell into panic.

An old minister said to Gao Yuan, the king of Goryeo: "Great King, now that our army has been defeated, there is a famine in the country, and I heard that there are also rebellions in the Great Sui, so why not collect some beauties and gold and silver treasures, and pretend to send people to the Great Sui to ask for surrender, as long as the Great Sui withdraws its army, it will definitely be unable to attack again." ”

The ministers reconsidered, Gao Yuan was originally a two-faced person, and he didn't care about the invitation, so he adopted the minister's opinion and sent it

The envoy came to the camp of the Sui army and asked for surrender.

Yang Guang accepted the Goguryeo beauties, and saw that the Goguryeo envoys had offered rich gifts, so he accepted Gao Yuan's surrender and sent someone to Pyongyang to personally escort Gao Yuan to Luoyang for questioning.

Lai Hu'er hurriedly returned from the front line and told Yang Guangyu: "Your Majesty, now that the main force of Goguryeo has been broken, our army should take advantage of the victory to pursue and destroy Goguryeo with one drum. ”

But Laihu'er's suggestion was opposed by almost all the ministers, and if the troops were not collected, the thieves were about to attack Luoyang, and the whole family wanted to do it anymore, how could the ministers of civil and military affairs dare to consume it here?

Yang Guang, who was reluctant to retreat, finally accepted the advice of withdrawing from the army, and ordered Laihu'er to withdraw the army as soon as possible, seeing that the three-year effort was in vain, Laihu'er withdrew with tears.

In August, Yang Guang, who retreated from Goguryeo, was ambushed by the righteous army led by Yang Gongqing when the frame arrived in Handan, and Yang Guang returned to Luoyang in a hurry, but at this time Luoyang was already surrounded by the rebel army and was very unsafe, so Yang Guang led the minister of civil and military affairs to return to Xijing Chang'an in a hurry.

Gao Yuan, the king of Goryeo who was far away in Pyongyang, saw that the Sui army had withdrawn to Guannai, so he immediately asked people to kill thousands of Sui Dynasty officials and soldiers sent by Yang Guang to escort him to Luoyang, and at the same time detained the people who migrated from the Sui Dynasty, and issued a proclamation against the Sui Dynasty again.

Yang Guang, who returned to Chang'an, transferred troops to quell the rebellion while waiting for Gao Yuan to surrender. Who knew that this wait was more than a month, and the news that Goguryeo rebelled again, which made Yang Guang, who was stubborn and self-serving, how could he swallow this breath, and when he heard the news, Yang Guang was furious, overturned the desk in front of the throne, and immediately ordered the general to gather soldiers and horses in strict armor and prepare to conquer Goguryeo again, but at this time, how could the Sui Dynasty still have this power.

Yang Guang was poor for three years, three expeditions to Goguryeo, more than 300,000 people of the Sui army were killed, the loss of the people was huge, almost every family in the world had no men, and the old and weak people left behind cultivated the land and farmed, and the harvest could not even solve their own food and clothing, and there were four or five out of ten phenomena of changing people to eat.

Coupled with all kinds of frequent forced labor, it brought heavy disasters to the people of the whole country, and also made the people of the world unbearable against the Sui Empire.

From the first conquest of Goguryeo, there were uprisings in the Sui Empire, until the third conquest of Goguryeo, the rebel army blossomed everywhere, the rule of the Sui Dynasty collapsed directly, existed in name only, and the local scholars and gate lords divided one side, disobeyed the imperial court, and began to join the anti-Sui army, sounding the death knell for the demise of the Sui Empire.