Zhang Song took the secret letter and quickly browsed it. His heart sank, but he instantly realized that the letter was hard to come by. After reading it, he naturally put it together and returned it to Yan Yan. Then Yan Yan shook the superstition into dust in front of Liu Zhang.

"Rise up overnight, don't say anything else, you must be determined to be enough!" Liu Zhang said very seriously, "Zi Qiao, stay, be prepared to recruit Yizhou civilians and ensure smooth logistics."

"As early as last year, I had transferred the food and grass to the county town along the southwest. General Yan only needed to bring the food and grass for three days of marching, from Shu County to Guangdu, and then from Guangdu to Wuyang, and then take the food and grass to Nan'an and go all the way south." Zhang Song immediately promised that as early as last year when he recruited elite troops back to Chengdu, Zhang Song made arrangements.

Since ancient times, the army has been moving before the food and grass has been taken first. Only when there is no problem with logistics support, can the army move forward smoothly. The biggest problem of the labor expedition is the difficulty of logistics support and the possible problems of local conditions.

The latter can be overcome by relying on the current recovery of the essence of heaven and earth, while the problem of the former is the trouble that has been around so far. As long as humans are still carbon-based organisms and still need to eat, logistics is indispensable.

There is another big problem with the logistics of the Laoshi expedition when the roads are blocked in ancient times, which is the limit of 150 days. If the previous place where the materials are transported is more than 150 days away from the place where the materials are needed, the expedition can basically be given up.

The reason is very simple. Whether it is cattle and horses or manpower, these things themselves require food. A distance of 150 days, the person who transports supplies needs to eat 300 kilograms of food. The cow and horses can transport more, but they can eat more.

In this way, in mathematical terms, there will be an extreme distance, that is, the maximum amount of materials these people can carry and the amount of consumption per day will have an extreme time.

There will also be a cost ratio, which is the so-called question of whether it is worth it if you eat less on the road than when you ship it. Generally speaking, eating half of the road and sending half on the road is already the limit that war can maintain.

Of course, both Qin Emperor and Wu Emperor had eaten 90% on the way, and only 10% were sent. I would kill you.

Therefore, the saying that eating from the enemy is only in the art of military affairs is that eating the enemy is one minute, which is ten minutes better than me. However, relatively speaking, the logistics transport team will be more efficient as the more supplies they eat, the faster the delivery speed will be. After all, as there are fewer things, it will be easier to transport.

Generally speaking, the army that carries dry food for three to five days, as long as the quality of the dry food is reliable, it only needs to solve the drinking water problem, and the logistics do not need to be carried. The army that carries military food for about seven days can ensure its own marching speed and will not be dragged down by the baggage team.

From Shu County to Indochina Peninsula, Zhang Song committed suicide and came back in person to solve the problem of sending troops again. He wanted to transport supplies from Shu County as a logistical support. If something happened ahead and the recruitment and preparations for Shu County were completed, five months would not be allowed to pass. Zhang Song calculated the time and felt that the daylily was not cold, so he probably had it all gone, so he would still beat a ghost.

Therefore, the first thing Zhang Song did when he came back last year was to solve the logistics problem, and logistics transportation must not be allowed to become a problem that restricts the speed of the march.

At that time, there were only two ways Zhang Song could think of, one was to build roads, but it was saved. The near Chengdu had not been completed, and the Hancheng Expressway in the north had not been repaired. This was not a matter of money, but a matter of manpower.

Zhang Su, Wang Lei, Huang Quan, and Li Hui were bothering to build a road from Central and South to Chengdu. Not to mention the start of construction, the agenda was not mentioned. Those unlucky children passed through the Southwest and still needed to burrow the forest.

Naturally, the most executable plan was killed due to the human power, so Zhang Song had no choice but to use his brainpower. While dealing with Sichuan and Sichuan affairs, he was thinking of ways everywhere. Finally, he accidentally thought of a word called "light disease preparation".

Why is the speed of the army slow? To put it bluntly, isn’t it because when the large army march, it is necessary to ensure that the slowest part will not be disconnected, so the entire army is particularly slow.

Just like the mixed army of infantry and cavalry, why is the marching speed the same as infantry? To put it bluntly, isn’t it just to take care of the slowest part. The fastest marching speed of a legion is not the fastest marching speed, but the slowest marching force.

Thinking of this, Sichuan and Shu are basically infantry, with standard marching speed, and not slow when all soldiers are elite soldiers. To put it bluntly, isn’t it just a baggage team? Moreover, the longer the baggage team drags, the more food it needs, the more food it needs, the slower the speed.

It's a vicious cycle.

Zhang Song waved his pen and cut the baggage team directly, and cut off the baggage team. With all the soldiers, the speed was at least five times faster.

Well, just do it like this. Now you only need to think about how soldiers of the baggage team should survive without the baggage team. This is not a problem for people like Zhang Song who have the spiritual talent to find teammates. The spiritual talent that can be used three times a year will be solved and consumed once. If the problem is solved, you don’t need the baggage team and set up a food storage point directly.

As long as each soldier carries no more than fifteen kilograms of dry food, that is, seven days of food, it does not affect the speed of the march. In other words, as long as each grain storage site is only a distance of seven days apart, the Shu army can achieve light and fast preparation.

The remaining problem is the establishment of grain storage sites. Anyway, Liu Zhang basically doesn't care about the matter, so it is Zhang Song's own business. In this way, Zhang Song directly changed the distribution of the treasury in Shu County, and even began to concentrate the population of major counties to ensure that the treasury is full of grain.

It was also a pity that the Huns invaded the year before yesterday, and the civil and military officials of Sichuan and Shu wanted to give Liu Zhang an explanation to completely eliminate the southern part of Yizhou, and the southern barbarians were included in the rule, and social conflicts were greatly alleviated. Otherwise, no matter how good Zhang Song’s plan was done, it would be impossible to implement it.

When Liu Zhang was happy when he heard this, he liked to go on his own order. Zhang Song said that I have finished dealing with it, and you are waiting to see the result.

"How long will it take to march to the southwest in this way?" Liu Zhang looked at Zhang Song with great satisfaction, and then asked.

"Forty days, with General Yan's marching speed, you can reach within forty days." Zhang Song said calmly. He had verified these things. For this reason, he moved the treasury of Shu County to an almost horse-drawn level, and then moved one city and another city over.

But I think Liu Zhang would not care about these things. Even if he knew how Zhang Song did this, he would probably pat Zhang Song on the shoulder and say, "What he did is really good."

"Since that's the case, General Yan, rely on you. If the situation ahead is not good, I will send a letter to me. Then I will go to the southwest to supervise the battle myself." Liu Zhang pressed the hilt of the sword with one hand and said majestic and domineeringly.

Yan Yan nodded expressionlessly, and then gave Zhang Song a look. Zhang Song understood it and said that he would definitely watch Liu Zhang and would not let Liu Zhang go to the front line. It was not that Zhang Song and Yan Yan looked down on Liu Zhang. To be honest, Liu Zhang took the lead and could definitely boost morale, but the problem is that if you go to the front line, Yan Yan, Zhang Ren and others will definitely not be able to perform.

"Rise up overnight!" Liu Zhang roared, then picked up the drumsticks himself and beat the war drums equipped on the city wall.

The dull advance drum beats, the subsequent sound of trumpets, and the neat steps, accompanied by Yan Yan and others jumping down from the city wall. In the darkness where the flames could not shine, a large number of soldiers wearing black plate armor stepped out, and then a neat roar came.

"Send troops!" With a sound of sending troops, Yan Yan pulled the horse with one hand and stepped on the air. Then he roared and rushed forward. All the soldiers also took great strides to start marching.

At the same time, Zhang Song ordered all the civil officials who were still on the inner city wall to work overtime temporarily to deal with the problems left by Yan Yan and others after they left.

Soon, on the walls of the inner city of Chengdu, except for a few guards standing guard, there were only two pairs of monarchs and ministers, Liu Zhang, Zhang Song, Yuan Shu and Ji Ling.

"Yuan Gaolu, how brave is my command?" After watching all the soldiers in Chengdu City leave, Liu Zhang shook his sleeves and looked at Yuan Shu with a little arrogant look on the side with his arms.

The brocade clothes and night walking are not Liu Zhang's hobby, he likes to show it to others, especially Yuan Shu, who is a guy of the same level as him.

Yuan Shu looked at the black-armored army that had disappeared at the gate of the city. Even though he had experienced war and had led a strong army, he had to admit that the demeanor and strength that Liu Zhang had shown before could be considered as the overlord of the road. It was not a problem to be called the overlord of the road a few years ago.

"Hmph, the guy who doesn't have 400,000 soldiers in the country actually asks me such a question!" Yuan Shu said with a sneer. If you want to get his Yuan Shu's recognition, you think too much, I, Yuan Shu, just can't speak. If you don't accept it, you will bite me. "Come on, let's go!"

After saying that, Yuan Shu sneered and turned around and left. Although Yuan Shu was dissatisfied with it, he felt that just by Liu Zhang's current performance, it would be strange if the so-called 150,000 Kushan army attacked the Han Dynasty.

"Bastard!" Liu Zhang was originally arrogant and arrogant, but Yuan Shu went up to a basin of cold water to extinguish Liu Zhang directly, so that Liu Zhang couldn't even speak. After a while, he realized and looked at Yuan Shu who had already fallen into the darkness and roared, "Bastard, Yuan Gaolu, if you have the will, don't go, I will teach you how to be a human being and stop him for me."

Zhang Song smiled bitterly and pulled Liu Zhang, "What a lord, you're so majestic for less than a quarter of an hour."
Chapter completed!