The occurrence of the "Xiaoying Camp" indicates that this army suffered a catastrophe. When the bombing of the army occurs, in order to avoid disasters, the troops generally adopt a defensive and cancel all offensive plans. However, it is often considered a special supernatural event and an ominous omen. Therefore, when they learned that the Xiaoying Camp in Xuyi City caused the loss, Sizhou was also affected by the incident, and the Song army took the opportunity to capture it, everyone in the palace felt a sense of disaster in their minds, and the loss of Sizhou City also shocked the ministers of Zhenjin.

The reason why the fall of Sizhou shocked the Mongolian and Yuan monarchs was to start with the Grand Canal that ran through the north and south. After the opening of the Sui Dynasty, the canal became a major transportation route connecting the north and south, and it was also the economic lifeline of the Central Plains dynasty. By the Song Dynasty, Kaifeng was established, and the long-term pattern of Shaanxi and Luo as the national political center was changed. As the economic status of the Yangtze River Basin gradually improved, the confrontation between the Song and Liao, Song and Xia was formed and the implementation of the Northern Song regime's policy of "guarding the inside and the outside" was more important.

Kaifeng has a flat field of thousands of miles and is radiating from all directions. On the basis of the transformation and dredging of the original waterways of the previous era, the Song court relied on the canal to form an artificial water transport system radiating around the center with the capital Kaifeng as the center. The Bian River is one of the "four rivers of canal transport", namely the Tongji Canal, and the route has basically not changed. To the west of Kaifeng, the Yellow River water flows east from the Biankou of Heyin County, into the water gate of the Bian River outside Kaifeng Prefecture, through the inner city, and out of the city from the outer Bian River below the water gate. The river section east of Kaifeng generally follows the current Huiji River and goes to the south of Sizhou City and enters Huai.

Therefore, the Caohe River in Song Dynasty diverted rivers, lakes and lakes, benefited from the South China Sea, and half the world's wealth and department stores in the mountains and lakes all moved from Bian Road to the saying that Bian River is the "foundation of the country". The city of Sizhou was first built in the Northern Zhou Dynasty, destroyed during the Sui Dynasty and was rebuilt in the Tang Dynasty. The city was located in the lower reaches of the Huai River, and the mouth of the Bian River entered the central plains region, and controlled the transportation between the north and the south. The importance of its political, economic and military status cannot be ignored.

After the Song Dynasty crossed the south, it was settled in a corner. The Jin Dynasty established its capital in Yanjing, and the capital paid grain from Yangcao Shandong and Hebei. At that time, the Yellow River flowed south and seized Huai River, Bian River, and Guangji River successively silted and abolished. The grain was transported only by Hui people and Yuhe River. Because the Yellow River was repeatedly flooded, the bed was shallow and the bed was low. During the reign of Emperor Shizong and Zhangzong, all the county officials in the Hebei Prefectures and County were ordered to take control of the Goucao River. The military service of Shandong, Hebei and Daming was dredged and managed river channels, and protected embankments, so it was customized.

The old path of Yongji Canal was long-lasting. In the 11th year of Dading, Jinkou was opened, and the Lugou River water was drained to the north of the capital and into Hao, and the east was to Tongzhou and into Lushui. A gate was set up to connect the Gaoliang River and Bailian Pond, and wanted to use the Lugou River to transfer the grain. However, due to the high and steep terrain, the Jinkou River was turbid and could not beat the boat, so it was still used to carry the land. In the fourth year of Taihe, the Zhou Lushui canal was opened, and the gate was built to save water, slowing down the slope, and finally the Yuhe canal ship was sent to Duxia.

In the fourth year of Zhenyou, Qinshui was opened to the Yuhe River for transportation; in addition, Jin also opened a canal in the northeastern suburb of Zhongdu to connect to the Wenyu River; opened a Changzhidiao and passed through Wan'an Lake in the territory of Lingbi County, Anhui Province, connecting Bian and Si, and all wanted to connect to grain. The Jin Dynasty did not have long fortune, so the canal was not used for a long time. However, after the Jin Dynasty's governance, some canals that were about to be silted were resurrected. They set up river warehouses in counties along the Yuhe River, set up a gang ship, and transported them twice in spring and autumn, and went to Tongzhou and Zhongdu cities Tongji, Fengbei, Fengshan, Guangji and other warehouses to store them, and transported nearly one million stones of grain per year.

After the Yuan Dynasty destroyed the Jin Dynasty, Kublai Khan inherited the Khan throne and began to build a capital city. In the second year of Zhongtong, Guo Shoujing went to the Water Conservancy Department and presided over six water conservancy departments. One of them was to recommend diverting water to the Zhongdu of the Jin Dynasty, reaching the old Caohe River in Tongzhou in the east and Kaihe River to Yangcun in the south. However, between 50 miles from Tongzhou to Dadu, there was a lack of water sources and still needed land transportation.

After that, the Mongolian Yuan pacified the south of the Yangtze River and still relied on the old canal for water and land transport. The route was: from the Yangtze River to the Huai River, and from the Yellow River to the Zhongluan Han Dry Station, transported 180 miles to Qimen, enter the Yuhe River, and then shipped to Dadu. This old canal road since the Sui and Tang Dynasties has undergone changes and has been unblocked for a long time and has many inconveniences in the canal transport. Therefore, the Yuan Dynasty government started to build and dig the Grand Canal one after another.

From the 18th to the 20th year of Zhiyuan, the Wen River and Si River were led by Aoluchi, and a 150-mile Jeju River was dug from northwest of Jeju to Anshan, Xucheng. Cao Road was from Huaihe River to Si River, and the Jinzhou River was from Anshan, and the Daqing River was from Dong'a and Lijin to the sea, and then transported from the sea to Zhigu to Dadu. After that, due to the silt and congestion of the sea entrance, the transportation route was blocked, and it was transferred from Dong'a land to Linqing to the Yu River. At this point, the north-south shipping in the Yuan Dynasty had roughly communicated, and the only thing that was not connected was the drought road of one or two hundred miles between Dong'a and Linqing.

If the development of history, the Mongolian Yuan formed a method of sea transportation at this time, and the transfer of water, land and sea and rivers was equally important, which basically solved the problem of canal transportation. However, after that, Kublai Khan died suddenly, Jin succeeded to the throne, Zhao Bing recovered Jiangnan and defeated the Mongolian Yuan navy, causing it to lose its control of the sea, and the sea transportation was cut off again. However, after losing Jiangnan, the canal no longer undertakes the task of transporting grain from Jiangnan, and its dependence on the canal was slightly reduced.

However, in the Mongolian Yuan lost Jiangnan, not only did they lose the tax territories, but also the salt farms along the coast of Jiangsu and Zhejiang. The dependence on salt in the Huai area became increasingly serious, and the transportation capacity of the canal was insufficient. Therefore, the real gold adopted the suggestion of Han Zhonghui, the Yin of Shouzhang County, and sent Li Chuxun to preside over the digging of Huitong River. From the southwest of Anshan, it flowed northward from the water source of Liangshan. It passed through Shouzhang to Dongchang, and then to Linqing to enter the Yu River. The total length was 250 miles and took six months to complete.

At the same time, last year, he was preparing to accept Guo Shoujing's suggestion to guide the Shenshan Spring in Baifu Village, Changping County, and cross Shuangta and Yuhe, and lead one acre. The waters of Yuquan reach the west gate of Dadu into the city, gather into Jishui Pool, and then go southeast to the Civilization Gate to Tongzhou and enter the Baihe River. In this way, the last 'one mile' of the canal entering the city can be opened, so that the canal canal can be driven into the city. This will not only speed up the transportation speed and save manpower. If there is war in the two Huai Rivers, it can also transport troops to the front line by water. However, the project has not yet been completed, and the Song army has begun to compete for the two Huai Rivers.

However, the Mongolian Yuan had basically completed the diverting project of the Grand Canal, forming the Tongzhou Lucky River, which entered the Dagu River from Tongzhou south to the Dagu River and the Yu River southwest; from Tianjin south to Linqing, it was connected to the Tonghe River; from Linqing to Anshan in Xucheng, Dongping Road, it was connected to the Huitong River of the Jeju River; from Anshan in Xucheng to Jeju, it was connected to the Sishui River into the Yellow River; from the Yellow River to Yangzhou into the Yangzhou Canal. It was connected to the Jiangnan Canal occupied by the Song Dynasty, from Zhenjiang through Suzhou, Jiaxing to Hangzhou, and formed the Beijing-Hangzhou Grand Canal that runs through the north and south.

Now that the Song army now occupying Xuyi, it indicates that its troops have reached Huaibei and aimed at the Central Plains. Moreover, the Song army occupying Sizhou is equivalent to controlling the northward route of the old canal. They can mobilize their troops and drive directly along Hebei Kaifeng, Luoyang, and even reach Xi'an, threatening the Mongol Yuan core area in the Central Plains. Zhen Jin and others believe that with the powerful naval army and transportation capabilities of the Southern Dynasty, controlling the canal is equivalent to mastering the key to the battle for the gate of the Central Plains. Therefore, the loss of Sizhou has reversed the situation again...

"Are there any Song army appearing in Shanyang?" After a while, Zhenjin, who had calmed down slightly, asked in a trembling voice.

"Reported to the Khan, the Song army departing from Yangzhou divided into two groups in Gaoyou, one by land to Xuyi, and the other by water to Shanyang. According to the latest battle report, the Song army's voyage is only one day away from Shanyang." Yue Chi Cha'er reported.

"What? Only one day's itinerary!" Zhen Jin was shocked. He knew that the speed of the Yima was as fast as possible to reach Dadu. Now, based on time, the Song army had already arrived at the city of Shanyang, and it was too late to send reinforcements. His face was distorted into a ball because of pain, and he whispered with his palms to support his forehead.

"Khan, Shanyang is the new canal that enters the Huaihe River. The tunnel that goes north to the Central Plains must not be lost. We must send reinforcements as soon as possible!" An Tong also said hurriedly. He knew that Shanyang is located in the core area north of the Gaoguan River in Jiangsu, adjacent to the river and the sea, in the center of Xuzhou, Haizhou, Nantongzhou and Yangzhou. It faces the sea to the east, and the Jianghuai Plain to the west. There are two big rivers, Huai and Si, to the north. It is the main transportation route to the south and north. Although there are no high mountains and ridges in the territory, it can control north-south transportation and material exchanges, and it is also the hub of the new canal.

"Don't worry, the Wanhu Mansion of Shandong, Hebei Province moved to Shanyang a year ago. This time, most of the people followed Yuxi Timur's southern expedition, but there were still thousands of Hongze's military farms left behind. They have moved to the city to defend. Even if they cannot win, they can stop the Song army from being blocked. We can quickly mobilize the personal guards to rush to help and block the enemy in Huainan!" Yue Chi Cha'er looked extremely ugly when she saw Zhenjin's face. Knowing that she was worried that Shanyang would fall, the Song army would be able to penetrate the Central Plains. She said again.

"Khan, I think that the Song army is attacking everywhere and sending troops to reinforce everywhere. It will not only be difficult to stop the enemy from advancing north, but may also be defeated by the enemy one by one. It is better to temporarily move forward to avoid the enemy's edge and then attack the Central Plains!" At this time, Brother Sang also suggested.

"Not nonsense, if you move to the enemy, will you give up the Central Plains to the enemy? Wouldn't it be that the Lord Shizuo's decades of hard work be ruined? Will the Left Prime Minister be the eternal sinner of the Yuan Dynasty?" An Tong roared angrily when he heard this.

"I am not this, but I am worried about the safety of the Khan. Now the Song army is strong, and the only soldiers that our army can fight is the guards guarding the capital. Once transferred, most of them will have no more troops to fight. If they are defeated, they will be taken advantage of by the enemy. However, there are still tens of thousands of elite cavalry of our clan, who will join forces and attack again, repeating that the Central Plains is within reach, rather than trying to show off their temporary pleasure!" Brother Sang defended.

"If you want to retreat, you should be killed!" Ye Li snorted coldly at this time, "Khan, the Central Plains must not be lost. This is the fundamental place in the world. If we lose the Central Plains, we will lose all our food and taxes, and we may be afraid that iron tools will be rare. How can we restore the Central Plains at that time?"
Chapter completed!