The 150,000 soldiers of the prefectures and counties in the Sanhe region are assembling in Huatai (Huaxian County, Henan), and Gao Cheng is not less prepared for the war, and even as early as when Wen Zisheng was sent to Nanliang, there were already eight envoys respectively, six of which were sent to Rouran, Turkic, Tuyuhun, Kumoxi, Khitan, and Goguryeo to comfort their people, so as not to make them make trouble behind their backs when they were personally conquering.

The other two missions went to sea on the Korean Peninsula to facilitate the joint Northern Expedition of Silla and Baekje to Goguryeo.

King Xiao Gao soothed Goguryeo, and it did not conflict with fanning Silla and Baekje and arching fire in their backyards.

Today, the Korean Peninsula presents a situation of three kingdoms, with Silla and Baekje standing side by side in the southern part of the peninsula in the east and west, forming the state of Wu Shu, while Goguryeo in the north encompasses the Han River valley and its northern part according to the trend of Cao Wei.

However, Goguryeo was not limited to the north-central part of the Korean Peninsula.

In 38 B.C., Zhu Meng, the concubine of the king of Buyeo, led the people to the south and established the Goguryeo regime in Goguryeo County (Xinbin, Liaoning) in Xuansu County of the Western Han Dynasty, becoming a border feudal state of the Han Dynasty, and the lord of the country took Gao as his surname.

The reason why it is said that the Bohai Gao clan is a big dye vat, the Goguryeo people contribute the most, since Emperor Xiaowen, the Bohai Gao clan has made a fortune, there are many people who are attached to Goguryeo, such as the seven-year-old Gao Gong, after the ancestors migrated to Bohai County, they also called themselves Bohai Gao, and his father Gao Bin is now serving as a counselor in the Northern Qi court.

Goguryeo has been established in 586 years, before the turmoil at the end of the Jin Dynasty, Goguryeo has conquered many surrounding feudal states, encroached on the homeland of the Han Dynasty, and took advantage of the Wuhu struggle for hegemony in the Central Plains, vigorously expanded the territory, that is, to this day, it encompasses Liaodong to the west, faces Liaozhou in the Northern Qi across the Liao River, occupies most of the Korean Peninsula in the south, deters Silla Baekje, borders the Sea of Japan in the east, and adjoins the Inje in the north.

It has been speculated by later generations that before Emperor Yang of Sui's northern expedition, Goguryeo had a standing army of 600,000 people.

It must be known that under Gao Cheng's rule now, there are only 260,000 infantry cavalry soldiers, 50,000 sailors, 400,000 state and county soldiers, a total of 710,000 standing troops.

King Xiao Gao originally didn't believe it, but according to the investigation and statistics of Li Yuan, the director of the Northern Ya of the Wangwang Division, over the years, this figure has also been roughly confirmed, and now there are 400,000 standing troops in Goguryeo, and there are still 60 years since Emperor Yang of Sui went on the northern expedition, and after 60 years of development, especially to catch up with the good season of climate warming, it is not impossible to increase the standing army of 200,000.

Since the end of the Han Dynasty, especially since the sixth century AD, the climate has gradually warmed up, and now in the middle of the sixth century, into the warm period, Goguryeo's domestic grain production has increased, but the peak of this wave of warm period is not until the heyday of the Tang Dynasty.

Thanks to the blessing of climate warming, there are few frosts in Hebei now, and the rebellion of the six towns in Hebei coincided with the disaster of frost and drought, and they had to survive.

Northern Qi's current prosperity has Gao Cheng's credit, of course, we must also be glad that he is in a good time, really throw him to the extreme Xiaoice period at the end of the Ming Dynasty, he may be able to do a better job than Chongzhen, but let him create a prosperous era of the people's wealth and country, only focusing on farming, it is really difficult for a clever woman to cook without rice.

Goguryeo's ambitions do not need to be elaborated too much, from a county to a feudal country to a territory of thousands of miles, they are not a country as well as the Southern Liang.

Gao Cheng always hesitated that once he raised a large army to the south, with Zhang Liang's 20,000 Liao soldiers, he could watch Liaoxi for him, and when he informed Yang Su of his thoughts, Yang Su offered advice to encourage Silla and Baekje in the south of the Korean Peninsula, so that they could unite like Shu and Wu and attack Goguryeo in the north.

Gao Cheng was overjoyed when he heard this, so he added two more missions to Silla and Baekje in addition to the other six routes.

The Goguryeo, Turkic, and Kumoxi forces in the northeast are distributed from east to west, with Goguryeo in the easternmost part, the Kumoxi people in the westernmost place, and the Khitan in between, bordering Liaozhou in the east across the Yanshan Mountains to the south.

In the early years, Ge Rong caused trouble in Hebei, and then Liu Lingzhu set off the Hebei Uprising, which caused many people in northern Hebei to flee to the northeast, and the Khitan tribes entrenched in the upper reaches of the Liao River and the surrounding areas also took advantage of the situation to rise and grow.

It's just that the Khitan is still in the tribal stage, and has not formed a tribal alliance, and its people are divided into the Siwandan Department, He Dahe Department, Fufuyu Department, Yuling Department, Rilian Department, Pi Ji Department, Li Department, Tuliu Yu Department and other eight departments, eight departments combined, the strength is not inferior to the west of Kumo Xi, but after all, it is only a plate of loose sand, according to historical records, until the early years of the Tang Dynasty, the Khitan eight departments have a common alliance chief.

Most of the Liao soldiers under Zhang Liang clashed with the Khitans, and Gao Cheng especially strictly ordered him not to cross the Liao River, and took the initiative to break out a conflict with Goguryeo.

Even if the Khitan is too scattered internally, and the physical exchanges that have been persistent for many years, Gao Cheng still has not given up the mind of comfort, after all, the more chaotic the interior, the easier it is to win over.

As for the last of the three forces in the northeast, Kumoxi is bordered by Northern Qi Youzhou and Liaozhou in the south, Rouran in the west, and Khitan in the east.

Because the Kumo Xi people faced the military pressure of the Northern Qi and Rouran, they were the most well-behaved among the three, Gao Cheng called the emperor to build the country, and the chief of Kumo Xi sent tribute, and the attitude was not disrespectful, Gao Cheng was quite sure of pacifying the Kumo Xi people.

As for Rouran and the Turks, there is actually no need to worry too much, since the Turks annexed the remaining 60,000 households of Gaoche, Rouran has been alert, and it is impossible to ignore the Turks and come to find trouble with her son-in-law.

The Turks are the same way, Gao Cheng has a secret marriage contract with the daughter of the Turkic leader Ashina Tumen, the reason why it has not been revealed to the world is that the Turks are unwilling to arouse Rou Ran's deeper vigilance, and the other is that Gao Cheng is unwilling to let Rou Ran find himself on two boats.

This time, the envoys of the six routes, in addition to the three routes of Kumoxi, Silla, and Baekje, who really took on the heavy responsibility, were the only ones left in the Tuyuhun Kingdom.

It has been seven years since Gao Cheng's western tour and Tuyuhun formed an alliance, and the two sides have exchanged markets on the border, each taking what it needs, except for disputes between the people during trade, there has never been a border provocation, and it stands to reason that they should sit back and relax.

But Gao Cheng knows that Yuwentai is not Zhang Shicheng, and he is definitely not a person who sits idly by, if he conquers Xiao Liang in the south, Yuwentai will definitely go north and try to recover Guanlong, but with the military strength of the 50,000 soldiers and 100,000 state and county soldiers arranged by Gao Cheng in Guanlong, if there is no Tuguhun to help, there is no chance of success.

After all, not to mention the danger of Longshan, Wang Sizheng, Hu Luguang, Pan Le three generals are by no means mediocre, on closeness, among the three, although Wang Sizheng has the name of the country, but still Hu Luguang is trusted, but Gao Cheng still presides over the Guanlong battle with the tower defense master Wang Sizheng, which is to determine the strategy of attacking the east and defending the west.

As long as Eli appeases Tuyuhun, Guan Long guards according to the danger, just like Sima Yi consumes Zhuge Wuhou, Yuwentai does not need to worry too much even if he commits a crime.