Due to the vast territory of the Central Plains, there are many mountains in the territory, and the limited level of science and technology, it is difficult to build qualified roads, so water transportation is an important means of transporting materials since the Shang and Zhou dynasties.

In this era, it can be said that it is very difficult for large-scale legions to march.

The conditions of most roads in ancient times could not be compared with the rural streets of later generations, and most dirt roads could only allow two or three people to travel in parallel. As a result, the army had to be lined up in two to four columns as it marched.

If an army is lined up in two rows of the city, and each soldier occupies one meter. In this way, Li Nan's army of 30,000 people will be 15,000 meters long, which means that this army will occupy 30 miles of road.

And that's just about the infantry, if it's cavalry, the size of the team will be even larger.

In addition to this, the army was too numerous to march from one road.

Because when the 30,000 horses disperse, it was fine, but once they gathered, they turned into terrifying monsters. These soldiers and horses will eat almost everything in the road, even the sand and gravel on the road will be trampled, and some of the water along the way will be drunk.

It is often recorded in history books that a certain general and soldiers are divided into several routes, but in fact, it is not that those generals do not know how to concentrate troops, but that they are limited by the environment and logistical capabilities, so they can only do so.

Changsha, the capital of the Chinese Empire, was nearly 2,000 miles away from the city of Tokyo in the Song Kingdom.

Even if there is no obstacle on the way, the weather is good, there is no wind or rain, and according to the fastest marching speed, it will not exceed 100 li a day, this is still the elite of the 30,000 empire led by Li Nan, and he did not carry any heavy weapons and baggage convoys and so on.

According to this theoretical speed, it will take at least a month for the 30,000 troops of the empire to reach their destination, Tokyo City, and if you look at the actual road conditions, it is estimated that they will not be able to get there for two months.

Now the two Jin soldiers are attacking fiercely, if it really takes fifty or sixty days to reach the battlefield, then the army of the Great Song Dynasty may have been broken through the city of Tokyo by the Jin soldiers.

After considering all the factors, the numerous staff officers of the Imperial Ministry of Defense plotted a seemingly distant, but in fact the most time-saving route for Li Nan.

The 30,000-strong army first marched eastward in the territory of the country, reached the province of Fujian, and then went south, crossing the border of the two countries to Hangzhou, the capital of the Song and Zhejiang roads, where they could take a boat from the Beijing-Hangzhou Canal to the north.

After years of warfare, the Chinese Empire has long realized the importance of roads, and the first thing to do after occupying every territory is to build roads.

In today's empire, smooth concrete roads were built between state capitals, and rails were erected for horse-drawn trains.

The horse-drawn train can run day and night without affecting the speed, which can be compared with water transportation.

Since the advent of this convenient and fast land vehicle, which can also transport people and materials in large quantities, it only takes a few days to travel from the southernmost province of Cochin to the capital of Changsha in the north.

A few months ago, after the Imperial Army occupied the Jiangnan West Road, Fujian Road, and Jinghu Road, a large number of prisoners from the Ming Sect, the Song Army, and those who had violated the laws of the Empire began to build the road in a race against time.

Horses run at speeds of 20 to 60 kilometers per hour, but most horses are very tired after 40 kilometers, but because they can change horses at stations along the way, and travel day and night, an army of 30,000 men crossed thousands of miles in a few days to Huai'an County, Fuzhou, Fujian Province.

Along the way, Li Nan frequently looked out of the train, and when he found that there were people working in the farmland on both sides of the road, he finally felt relieved.

The past few years of the Song State have not stopped, first Hua Shigang and those corrupt officials in the Ying Feng Bureau, who made the people in the Jiangnan area miserable, and then broke out a huge Mingjiao uprising.

Liangzhejiang Road, Jiangnan East and West Road, and Fujian Road were all devastated by the rebels.

In just half a year, Fang La's rebels attacked 52 counties in six prefectures, killing a total of 2 million officials and civilians. Fang La's army also plundered women, and when Fang La's army led by Tong Guan broke through, the captive (rape) women who hanged themselves naked in the woods looked at each other for more than ten miles.

The Jiangnan region was originally the most prosperous land of fish and rice in the Song Kingdom, and it was also the largest production area, but after these natural and man-made disasters, the number of people decreased sharply, and a large area of fertile land was also abandoned.

After Tong Guan defeated Fang La's rebels, the Song court also opened a warehouse for the people of Jiangnan to release grain, but after facing a huge number of displaced people, that grain was like a mud cow entering the sea, and disappeared in an instant.

It is fair to say that after the imperial army contributed these state capitals, it saved countless ordinary people and displaced people.

Millions of stones of rice, farm tools, and seeds converged from Champa Province, Jiaozhi Province, Dali Province, Guangxi Province and other provinces to these prefecture capitals......

The Chinese Empire not only provided enough food for these affected people, but also built them with unified housing, distributed seeds and farm tools, and even cultivated cattle to help them start a new life in the fastest time.

People's hearts are long, and the Song State displaced, changed their children, and the empire touched these people with practical actions.

When the farmers who were plowing on both sides of the road saw the troop train flying the double dragon flag passing by, although the cheers were scattered, after all, it was no longer the hatred it used to be, and this was the biggest progress.

After the 30,000 troops entered the territory of the Liangzhejiang Road of the Song State, they still saw a barren land, but after seeing the Song envoys who greeted the imperial army here, Li Nan, who had been easily accommodated, was still quite surprised.

The envoy sent by Huizong Zhao Ji to coordinate the entry of the imperial army this time was Li Nan's old man in Tokyo City, the son of Cai Jing, and now Cai You, who is now a young master.

Cai You may have been influenced by his father Cai Jing, although he relied on flattery to win the favor of Huizong and ascended to a high position, but he did not think about politics, and only sought money and wealth, and even fought with his father because of power.

Seeing that it was the old man Cai You, Li Nan, who had dealt with him, smiled instead.

If the person who came was a hardliner like Li Gang who served the country and the people, Li Nan was really afraid that the other party would take a risk, and he would kill himself first despite the siege of the Jin soldiers.

For Li Nan, a corrupt official like Cai You who loves fame, fortune and money is easier to corrupt communication, but a guy like Li Gang who doesn't eat oil and salt is really a headache.

Deliberately changing his voice, Li Nan dismounted and came to the front with a respectful smile on his face, looked at it carefully for a moment, and then said knowingly: "Song envoy is the young master of Song Kingdom, Cai You, Cai Ju'an?" ”

Although the person in front of him gave him an inexplicable sense of familiarity, Cai You didn't dare to ask more, and responded with a smile: "It's Cai You below, dare to ask the general's name?" ”

Li Nan touched the beard that was sticking to his face, and laughed: "It's good to say, this general's surname is Huo, and his name is Huo Rongjin." ”

Although Cai You is greedy for money and lustful, and likes to compete for fame and fortune, he is naturally not a stupid person after decades of dominating the officialdom of the Great Song Dynasty, and when he heard it, he knew that the other party reported a fake name, but he did not break it, and still called Li Nan General Huo.