Shanzhou was called Xiping County in ancient times, with a land of Tuyuhun and very close to Qinghai. As for the Heyuan Army, as the name suggests, it is the army stationed at the source of the Dahe River.

Shancheng is the prefecture of Shanzhou. As for the Heyuan Army, the base of the Heyuan Army is located in Huangyuan on the west side, with a distance of more than 60 or 70 miles. Since the roads mainly pass through Huangshui Valley, the terrain is flat and open, and the road is not rugged.

Li Tong was surrounded by Heichi Changzhi and others and rode west along the Huangshui River. Although this environment does not belong to the real plateau range, the low pressure still brings a clear feeling of asthma. When moving in such an environment, the energy consumption of people and horses will be doubled.

However, Li Tong just rode a horse and did not feel heavy in the armor. Some discomfort was not enough to affect his movements. He gradually adapted to the breathing frequency.

On the way, Li Tong saw that the Huangshui River was quite surging and had a faint momentum of spring flood. Around the Huangshui River Valley, there were large areas of reclaimed land, and there were many soldiers working hard in the fields at this time.

Such scenes of scenes were quite surprised by Li Tong. Putting aside the climate that was significantly different from the inland, what he saw now was that the surrounding river source, whether in terms of hydrological environment or arable land resources, was not inferior to the mainland, and even vaguely surpassed some areas in Guanzhong, which was much different from the previous stereotype of the land on the right side of Longyou.

"Counting the source of water comes from Qinghai, and there are many snow-capped mountains in the area. Spring and summer warm up, snow water melts, and rivers and canals are filled, so we can naturally defend the power of camping the fields."

Hei Ya Changzhi followed the perspective of His Highness Yong, saying that war was not limited to swords, weapons, arches and horses, so this time, King Yong's tour was not limited to various beacons. He also briefly explained the various business conditions of the Heyuan Army along the way: "In the past, this land has been reclaimed for more than 5,000 hectares of land and harvested 5 million hu of water every year. Not only does the Heyuan Army use it, but all borders in the Longbian border have also benefited greatly..."

When talking about past achievements, Black Teeth Changzhi is also proud.

He built the Heyuan Army with great difficulty and effort. It is no exaggeration to say that the guards here were attacking against the trend in the Battle of Chengfengling, and then he sacrificed his life to counterattack before he brought them back to Shanzhou from Tuyuhun.

The actual support the court could provide at that time was really limited. At that time, the Heyuan garrison was even hungry and needed to resist the continuous attacks of Tubo while picking and fishing.

Having gained a foothold, the next year, Tubo launched a fierce attack on Heyuan. At that time, Heichi Changzhi was in Liangfeichuan with few enemies, defeated the foreign army and gained abundant gains, so that the situation in Heyuan was stabilized.

The batch of military resources obtained became the foundation of the Heyuan Army's operation. Based on this, Heichi Changzhi's deep management in Heyuan, farming and garrisoning, and built more than 70 beacons in combination with the terrain to form a complete prevention and control system.

Since then, the foreign horses did not dare to advance eastward for several years. Until the Chuigong period, the court recruited Heichi Chang to return to the court to quell the Xu Jingye Rebellion, and no large-scale war occurred between the two countries.

Although Lun Qinling was called the God of Tubo Army, he still did not dare to snoop when facing Heichi Changzhi. It can be said that if Heichi Changzhi and Heyuan Army were not allowed to suffer two major defeats in Dafeichuan and Chengfengling, and more than 200,000 Tang troops hated the south of Qinghai. In the confrontation with Tubo, the Tang Dynasty was really shameless.

Along the way, Hei Teeth Chang told a brief story, while Li Tong listened carefully, and did not think Hei Teeth Chang was deliberately showing off. Of course, even if he was showing off, he had such capital.

At the same time, Li Tong couldn't help but sigh that his grandfather Li Zhi, the emperor, did the first half of his life, was really a state that all emperors dreamed of. He inherited the legacy of Zhenguan, controlled the powerful ministers internally, and attacked and destroyed powerful countries externally. It can be said that he was extremely arbitrary.

But all this ended until the Battle of Dafeichuan, and the growth of Tubo's power was already difficult to curb. The domestic military was in full swing and the various problems after the extreme expansion broke out.

Including Li Zhi himself, he was also tortured by illness. His wife was too big and the crown prince repeatedly failed. So Li Zhi no longer had the mighty and recklessness he had before. After the war, Dafeichuan had been recuperating for nearly ten years. Finally, it was during the Yifeng period. When Tubo Zanpu died, he sent troops to attack Tuyuhun again. As a result, the entrusted scholar Li Jingxuan ordered his troops and encountered a more tragic defeat in Chengfengling, which was even more violent than Dafeichuan.

After two consecutive defeats, Li Zhi and the Tang Empire were both declining, so that shortly afterwards, the Turks resurrected and rebelled on the southern part of the desert. The first half of the life was full of vitality and glory, and the second half was sick and weak, and internal and external troubles. If there was no successor, Li Zhi and Emperor Yang of Sui were quite similar in life.

"The water and grass in Jiuqu, Huangyuan and other areas are rich and not inferior to Guanzhong. The only regret is that they have not been cultivated for enough years. If the grains cannot be stored in the warehouse before July, they can only be hungry, cold and warm. The previous trap of humble officials is that the Heyuan storage is not enough. If the farming work is missed this spring, the funeral will be even more difficult..."

The land of Hudi is not snowy in August, and the farming and harvesting period is too short, which is a major factor restricting the development of agriculture.

Although after Heichi Changzhi left office, the successor Lou Shide made another gain on the basis of the original settlement, which made the scale of settlement reached more than 7,000 hectares of land in the heyday of the Heyuan Army, and the arable land spanned Huangyuan, Taoshui, and Dayi people's livelihood and military affairs.

But no matter how rich the savings were, they could not withstand the consumption of several major wars. The imperial court's operations in the Western Regions greatly exhausted the Heyuan Army's savings.

After Lou Shide returned to the court, the Heyuan army had lost control. In addition, Tubo Lunqinling had solved the civil strife of his brother being killed, and returned to Qinghai again to take charge, increasing the invasion of Heyuan. By the time Heichi Changzhi returned to Heyuan again, the original scale of the settlement had been reduced by more than half. If he lost farming again this year, there would be no danger of continuing.

So before that, no matter which envoy from the side came to contact Heichi Changzhi, he had to ask about his strategy for Tubo, that is, he did not want to see the Heyuan Army he established was abandoned. In the end, only King Yong expressed his strong support for the Heyuan Army, and even personally led the army to escort materials to Long.

The group walked and stopped and arrived at Huangyuan City, where the Heyuan Army was stationed in the morning. Unlike the noisy and lively city of Shancheng, the atmosphere here in Huangyuan seemed much more solemn. People and armor were all in and out, and they were checked along the way.

"Although Huangyuan is the garrison of the Heyuan Army, the army gathered here for not much time. From here, we went west, and Chiling was thirty miles away, and Chiling was the place where the two countries fought and killed each other, and they almost fought every day."

Following the direction pointed by Black Tooth Changzhi, Li Tong looked at the horizon and saw that the horizon was gradually rising, and it was no longer flat. Today, the clouds were thin and the vision was not very good, but he could still see that the snow tops of the peaks were vaguely connected with the clouds floating in the sky.

As the group entered the city, there was a noise in front of the camp outside the city. Several armored soldiers with messy armored clothes and blood-stained armored soldiers were surrounding the military officers in the camp and shouting loudly: "I have been fighting for the past year since the Beacon Castle of Magangling, nearly a hundred foreign thieves have been killed. Today, they have been attacked by the thieves. More than a dozen people are seriously injured and waiting to be treated. How dare you thieves say there is no medicine?"

Seeing this, Li Tong was about to walk over, but was stopped by Heiqi Changzhi: "This state is not complete, so your highness should not show up easily."

"It's already so difficult to save in the camp?"

Seeing the eyes of several warriors who had just retreated from the front line, Li Tong couldn't bear it and took a deep breath and asked in a deep voice.

"The storage can still be used for the month, but we have to seal the warehouse and prepare for war. We don't know where the war will be fierce in the future, and whether there is any danger."

Heichi Changzhi saw that King Yong was still waiting to speak, and continued, "Your Highness is kind and kind, but the military funds in the pass will not reach Huangyuan for one day, and the warehouse should not be opened lightly in one day!"

The tragic offensive and defensive wars on the front line of Heyuan are far beyond Li Tong's previous understanding. He is far from being able to be harsh and cruel to the enemy, but he cannot bear to see his own soldiers on the verge of death to save them. However, he will not easily question Heiqi Changzhi's decision, but just covers his face and leaves, but his sense of responsibility becomes heavier.

"If Tuyuhun is not lost, the situation in Longyou will not be so dangerous!"

Li Tong also knew about Heichi Changzhi's feelings, but after all, it was based on the summary of paper talk and did not have too deep feelings. When the group of people took a short rest in the Huangyuan Camp and arrived at the Chiling Beacon Castle, Li Tong truly felt how heavy the meaning of this sentence was.

Chiling is the geographical dividing line between Tuyuhun and Longyou of the Tang Dynasty. The peaks and ridges stretch for hundreds of miles. To the east is Shanzhou of Longyou, and to the west is the Haidong area of ​​Qinghai.

While walking forward in the Chiling Mountain Road and passing through a hillside at the bottom of a beacon, Li Tong also saw that human bones were still thrown away under the gravel of the rugged mountain road, but he was not sure whether the Tubo people died here in battle or the Tang Dynasty soldiers.

There are countless traces of this kind in the Chiling Mountain Road. At first, Li Tong was quite moved, but gradually, he became a little numb about it. He just walked hard while listening to the story of Hei Ya Changzhi.

"The people who are arguing about the defeat of Dafeichuan and Chengfengling, all sighed. But they didn't know that if Chiling was under the control of the thief, it would be rare if they asked for this defeat again..."

Heiqi Changyi walked while talking about the arrangement of defense. The Heyuan Army was located in Huangyuan, but the real focus of defense was the Chiling Mountains. Only in this way can the Tubo army resist in the Tuyuhun territory on the west side. Once the blockade of Chiling was broken through, the Tubo army could attack Longyou Zhucheng without any obstacles and plunder the countryside.

Originally, Tuyuhun was crossing between the two countries and existed as an important strategic buffer.

However, as Tubo took down Tuyuhun, the balance of the battlefield tilted towards Tuyuhun. In previous years, the two major battles between the two sides, whether it was Dafeichuan or Chengfengling, took place in Tuyuhun territory. In other words, even if it paid such a great price, the Tang army still did not attack Tubo's land!

However, the consequences of allowing Tubo to invade Tuyuhun are not the end. If the situation still develops according to the original history, the Tang Dynasty in the future will pay a heavier price for this strategic mistake, and the time will be calculated in a hundred years!

After climbing a peak ridge, Li Tong looked around the fields, thoughtful, and then asked: "Can there beacon castle in this place called Stone Castle City?"
Chapter completed!