They traveled through the valley of Po Luozhen, the mouth of today's Oro Mountain, and could not even find a water source.

"Zizhi Tongjian" records: "People are icy, horses are snowy." ”

The army came to Han Wai Mountain, which is today's Ola Mountain.

The average altitude of this mountain is more than 4,500 meters, and the vast majority of people who are accustomed to living at low altitudes have difficulty adapting to the area around Qinghai Lake, which is more than 1,000 meters higher than Qinghai Lake!!

Since ancient times, when the Han people came here, it was often difficult to move forward and had no choice but to turn back, so it was called "Han Crying Mountain".

At this time, it is necessary to thank the medicine king Sun Simiao for the sedum five plus drink, so that the Tang army can finally pass through the snowy mountains in midsummer and enter the reckless realm of desolation and chaos.

After leaving the Han Crying Mountain, Hou Junji and Li Daozong led the army to Wuhai.

The water quality of this lake is bitter, today it is called the bitter sea in Chinese, and it is called Doucuo in Tibetan, which also means bitter sea.

Here they encountered the Tuyuhun army, broke it, made great gains, and captured its king.

However, Fu Yun escaped without a trace under the protection of the army.

So the two of them continued to march south, and then came to the Xingsu River, which is today's Xingzhu Sea.

The "Three Sources of the Yellow River" known in modern times, Kariqu, Yuegu Zongliequ and Zhaqu, converge into this area from the southwest, west and north respectively, forming large swamps and many small lakes.

Looking at it, it is like the stars in the sky, so it is called Xingsu River and Xingzhu Sea in Chinese.

In Tibetan, it is called a wrong pot, which means a sea of flowers; Also known as Mayang, which means peacock beach, describes these seas dotted on the wetland, like the markings on the tail feather of the peacock when the screen is opened.

Although Fu Yun's main army has fled westward, there are still Tuyuhun troops here.

Hou Junji and Li Daozong repeatedly encountered enemy troops and won every battle.

After all, the Tuyuhun Army at that time, no matter tactics, training, and equipment, could not be compared with the Tang Army.

The two of them continued to trace the river and came to Baihai.

The waters of the Baihai Sea are divided into two seas, east and west, which are today's Ngoring Lake and Zhaling Lake.

At that time, there was only a narrow road between the two seas, which was called Bailiang.

The land in this area is seriously alkalized, and the altitude is high, and only cypress trees can grow, so it is called cypress sea and cypress beam.

In fact, most of the land around the Qaidam Basin is alkalized.

Cypress trees can adapt to alkalinized land and tolerate drought and cold, so the trees in this area are mainly cypresses.

This place is already the highest place of the big stone mountain, Hou Junji, Li Daozong look north from this, but see the snow of the mountain, such as ice and jade; Look at the source of the great river, like the stars and the moon.

After searching everywhere, there was no trace of Fu Yun or Tuyuhun troops, so he had to go down the mountain in a daze.

The two of them originally planned to continue to carry out the task of Li Daozong's Shanshan Dao after completing the task of Hou Junji Stone Dao.

However, at this time, he received a report of the death of the emperor.

Li Tang's royal family inherited wind and qi diseases.

In the spring and summer of the eighth year of Zhenguan, Li Yuan's wind disease has become more and more serious, so Li Shimin ordered to build Yong'an Palace for the emperor.

Since the beginning of the summer of the ninth year of Zhenguan, Li Yuan's condition has deteriorated day by day.

On the sixth day of the first month of May, the day Gengzi collapsed in the vertical arch hall of Da'an Palace.

According to the Old Tang Book. Gaozu Benji records that Li Yuan left a testament on the occasion of his great growth: "After the funeral, the emperor should look elsewhere as a major military matter." Its clothes are light and heavy, all from the Han system, to the day and the moon. The garden and mausoleum system is frugal. ”

So the ministers went to the table and asked the emperor to deal with military affairs in accordance with the emperor's edict.

Li Shimin naturally did not agree easily, and ordered the crown prince Li Chenggan to settle the government in the East Palace.

The so-called "ritual does not cut down the funeral" was originally a ceremony for the national funeral of the enemy country.

However, in the national funeral, there are more etiquette and taboos.

So at this time, Hou Junji and Li Daozong, under the instructions of Pharmacist Li, no longer advanced to Shanshan, but returned to Dafeichuan, where the whole army mourned, waiting for Pharmacist Li and Li Daliang to return to the division.

From Fuqicheng through Kushan, Dafei River, Poluozhen Valley, Hanwai Mountain, Wuhai, Xingsu River, and finally Baihai, the mountain road along the way is about 1,500 miles, and the altitude climbs from 3,200 meters to 4,300 meters.

In this alpine desert region, the Tang Army of Southern Province traveled 3,000 miles back and forth in 40 days, which can be said to be galloping every day, which is really a very magnificent achievement!!

At the same time that Hou Junji and Li Daozong went to the river to explore the source, Li Yaoshi and Li Daliang led the army westward.

Xue Guwu, Su Dingfang, and He Bi were all under the command of Pharmacist Li, and Hebi often stayed by Pharmacist Li's side, but Su Dingfang refused to leave an inch on this trip.

In addition to "swearing to follow Ling Jun to the death, hanging his life in order to atone for his past sorrows", not long ago he began to assist Pharmacist Li in sorting out military studies.

As a result, Su Dingfang further deeply realized the greatness of this teacher, not only is there no one before, but he is afraid that it will be difficult to have anyone in the future.

Now he only prayed that he would be able to help a little in the process of completing the military science work of this great military god.

Therefore, even when Pharmacist Li got on and off the horse, Su Dingfang insisted on serving in person.

He Bi is strong, but he can't make him change his mind a little.

Xue Wanche was in Li Daliang's army, because his brother Xue Wanjun was the deputy head of the march of Hedong Road and the end of the road.

Before Xue Guwu took Mantou Mountain, during the ten days that Li Daozong went to Kushan, Xue Wanche had already made some gains.

At that time, Pharmacist Li ordered the generals to inspect the Qinghai River, and Xue Wanche encountered the Tuyuhun army at Niuxindui in the east of Qinghai Lake.

There were only more than 100 horsemen around him, but he took the lead and rode alone.

Although the other party had thousands of horsemen, they did not dare to engage him, and fled in the hope of the wind.

Xue Wanche returned to the camp and said to Xue Wanjun: "The thief is easy to !! ”

The two led the army to pursue again, breaking thousands of enemy cavalry, and won the three armies for a while.

Such a result made them inevitably a little underestimated.

At the same time, the stubborn Sili encountered the Tuyuhun army in Juruchuan, south of Qinghai Lake, and also took more than 100 cavalry to defeat the opponent's thousands of cavalry, and completely wiped out Qinghai River and Qinghai Lake area.

So Li Yaoshi arranged for a small number of troops to stay in Fuqicheng, and he and Li Daliang led the army westward.

They crossed the Kushan Mountains and entered the Yanze Moraine, which is today's Qaidam Basin, which means Yanze in Mongolian.

They marched along the southeastern edge of the basin, and after taking the Ulan, they entered the eastern edge of the Chishui River and advanced straight in the direction of Bailan.

At this time, Chishui, which is today's Qaidam River, is close at hand.

As early as in the ancient book "Classic of Mountains and Seas" of the pre-Qin period, there was a record of Chishui.

There is a saying in the "Great Wilderness West Classic": "In the south of the West Sea, on the shore of quicksand, after the red water, before the black water, there is a big mountain, called the hill of Kunlun." "The red water flows red, hence the name.

Locals call it Ulan Wusu Gol, which also means Red River.

And the name of Li Yaoshi's "Kunqiu Road March" comes from the "Kunlun Hill" produced by this red water and black water.