On the third day of the seventh month of the first year of Zhaode (548), after resting under the city of Huaiyin for two days, the army of the Northern Qi Dynasty was divided into three routes, all the way to Xuzhou Thorn Shi Gaoyue who crossed the Huai to the south as the main general, led 30,000 soldiers of the state and county, and led 20,000 soldiers and foot soldiers by Yuan Jing'an and Wei Xingqing, the governor of the cavalry, and Hou Yuan, the governor of the cavalry, led 5,000 cavalry and 5,000 followers, and divided 100,000 people, went south along Huaiyin, and attacked the eastern states and counties of Huainan along the way.

The second road is with Murong Shaozong as the governor, and also leads 30,000 soldiers from the prefecture and county, with 20,000 soldiers and infantry soldiers led by Bu Dahansa and Xue Guyan, the governor of the infantry army, and Pi Jinghe, the cavalry governor and 5,000 cavalry soldiers, and allocated 100,000 people to attack the western prefectures and counties of Huainan.

The third route was Gao Chengqin led 40,000 cavalry, 60,000 infantry troops, carrying 300,000 people, leading cavalry generals Peng Le, Gao Aocao, Hu Lu Qiangju, Hu Luping, Qi Lieping, Murong Yan, etc., and infantry generals Han Rail, Bang Xian, Qi Lianmeng, etc., entered Hefei.

As for the remaining 50,000 county soldiers and less than 100,000 people, they were all handed over to Duan Shao, who was ordered to sit in Huaiyin and be responsible for assigning sergeants to garrison Gaoyue and Murong Shaozong's newly acquired land.

At the same time as the three-way army moved south, the surrounding situation also changed.

The first is Goguryeo, in 531 AD, that is, the same year that Gao Huan Xin Du Jianyi, the Goguryeo monarch, the 12-year reign of Anzao King Gao Xing'an was assassinated, because Gao Xing'an had no children, the throne was inherited by his younger brother Gao Baoyan, was the king of Anyuan, sent an envoy to Luoyang to pay tribute, and in 532 was canonized by Yuan Shanjian.

Gao Baoyan ascended the throne with a small sect, in order to appease all forces, set up three queens, each of the three queens had their own factions, one of them had no children, and the other two factions fought for the right to inherit the throne, even if Gao Baoyan was designated as the crown prince after the birth of his eldest son Gao Pingcheng, but it could not alleviate this contradiction.

Since then, Goguryeo has ended a period of more than 100 years of prosperity and enterprising since the good king Go's Tae-deok, and has fallen into infighting, and has actually begun to decline.

Three years ago, in 545 AD, Gao Baoyan died, and the two factions fought for the throne first, and finally the supporters of the crown prince Gao Pingcheng seized military power before he could ascend the throne, and he was the king of Yangyuan, who was eight years old at the time.

However, the struggle for power did not end with the ascension of King Yangwon, and the losers of the struggle for the throne learned from the pain and began to build up armies to exercise de facto control over their own territories, and the Goguryeo Kingdom was effectively divided.

After Gao Cheng's envoy arrived in Pyongyang, he first canonized the envoy of Gao Pyongcheng, Shizhong, Hussar General, Captain Dongyi, General Ningdong, and King of Goryeo.

The reason why he was the king of Goryeo, and not the king of Goguryeo, was because since the late 5th century AD, Goguryeo changed its name to Goryeo.

The envoy fully complied with Gao Cheng's explanation, and used the argument that external conflicts covered up internal contradictions, and instigated Goguryeo to send troops to destroy Silla and Baekje, and completely occupy the Korean Peninsula.

In order to show sincerity, and at the same time informed all the plans of the Northern Qi Southern Expedition, the King of Yangwon did not believe it at first, but as Gao Cheng issued the edict of the Southern Expedition and asked Liang Xuanwen, he was convinced, and there was no need to worry about the sneak attack of the Northern Qi, so Goguryeo really sent troops south, trying to destroy Silla and Baekje, and end the situation of the three kingdoms on the Korean Peninsula.

At the same time, during Goguryeo's southern expedition, two other envoys sent by Goguryeo also arrived in the southern part of the Korean Peninsula by sea, using the example of the death of the lips and the teeth, to promote the union of Silla and Baekje.

As for the other two forces in the Northeast, considering that the Kumo Xi people have repeatedly paid tribute since the Northern Wei Dynasty, after Gao Cheng usurped the country, he also sent envoys to the court to ask for trade, so Gao Cheng sent envoys to canonize the leader of the tribe of the Emperor as the king of Xi, open the border of Youzhu and Liaozhou, and trade with it.

King Xi faced Luoyang and repeatedly thanked him, under the condition that Gao Cheng disturbed the situation on the Korean Peninsula and induced a war between the North and the South, and Goguryeo had no time to clone, it was even more unlikely that the Kumo Xi people would threaten the rule of Northern Qi in Liaoxi.

As for the Khitan Eight Divisions that have not yet entered the tribal alliance, Gao Cheng's envoys can be called a war plague, and every time he arrives, he always takes the example of insulting the leader of the main tribe to receive the title of King Xi to stimulate the leaders of the Khitan Eight Divisions, provoke their old grievances, and make them focus on internal friction.

But the Khitan failed to form a tribal alliance, and the leader of the alliance was decided like the Kumo Xi people, because the strength of the eight Khitan tribes was equal, so although under the provocation of the envoys sent by Gao Cheng, they fought each other in the dark, but in the short term, there was still no tribe with the strength to surpass the remaining seven.

After the outbreak of the Khitan civil strife, the envoys of the Northern Qi in the Kumo Xi tribe instigated the king of Xi to take the opportunity to plunder the Khitan and deepen the contradictions between the two parties according to Gao Cheng's previous explanation.

Goguryeo's strategy in the northeast region is really lacking in virtue and smoke, but the effect is indeed significant, Goguryeo's southern expedition, due to domestic contradictions, can not go all out, there are those who are the losers of the struggle for the throne dragged their feet, deep in the quagmire of the Korean Peninsula Civil War can not extricate themselves.

The Khitan fought internally, and the Kumo Xi people watched the fire from the other side, waiting for the opportunity to take corn seeds from the fire.

Even if Gao Cheng's army went south, there was no border fire in Liao and Youzhou.

Compared with the noisy but peaceful northeast, the Guanlong area contains the black clouds of war in the tranquility.

Yuwentai only learned the so-called "Suo Yu He De dominates the world, and Bei Lingyan can match a noble girl", so he guessed that Gao Cheng was about to use troops against Southern Liang, and it was a big war, otherwise he would not have set off a public opinion offensive before the war, and he could only say that he was an old opponent after all.

So he immediately took the construction of fortifications as a pretext, disguised the main force as the recruited people, and gathered in Hanzhong, trying to confuse Gao Cheng and take advantage of his unpreparedness to attack Guanlong.

However, Yuwentai underestimated Gao Cheng's attention to him, and Yuwentai's secrecy was very good, but Gao Cheng not only did not transfer Guanlong's troops to the south in complete ignorance, but also sent Hu Luguang to lead 30,000 Xianbei soldiers to assist in defense.

Yuwentai knew that Hu Luguang was heading west, and even began to wonder if someone inside had leaked the news.

The Northern Qi stationed 50,000 soldiers in Guanlong, 100,000 state and county soldiers, and defended it with the danger of Longshan.

So he sent an envoy to Tuyuhun to lobby Kwarlu, willing to share Guanlong with him, and promised the right land of Long.

Although Gao Cheng had expected it and sent a messenger all the way to comfort him, the chips were really not as rich as Yuwentai, after all, Yuwentai was promising other people's belongings, so he was naturally very generous.

Kwalu had the intention to send troops to Longyou to attack the two counties of Huanghe (Qinghai Hualong) and Xiping (Qinghai Ledu), but Hu Luguang led 30,000 troops to inspect Longyou and Yaobing Hexi, but he hesitated again.

While he was hesitating, Hu Luguang sent an envoy to Fuqi City, and finally made Kwa Lu make up his mind.