Since neither the first nor the second option is feasible, the third option can only be used.

Miasma is gaseous and volatile, and water vapor and air are mixed with miasma, which is the prerequisite for easy poisoning.

And the volatilization of miasma also depends on the temperature.

Southern Xinjiang is hot, even in winter, it is very warm, which is also a prerequisite for the miasma to be able to volatilize. However, because it is winter, the climate here is warm, but the temperature is very low for more than two hours at night.

When the temperature is low, the miasma will naturally not volatilize.

Therefore, if you want to cross the river, it is best to cross the river at night.

In the previous life, the original owner only learned about this method through the native guides in southern Xinjiang.

"Southern Xinjiang is hot, miasma volatilizes, mixed in water vapor, and it is only poisonous with water. If you want to cross the river, you can only cross it at night, the temperature is lower at night, the river water is colder, the miasma can not volatilize, and the river water is the least toxic. ”

"Therefore, when General Zhang crosses the river, remember to cross the river after midnight."

After thinking about it, Zhuge Liang explained to Zhang Ren.

Hearing what the military advisor said, Zhang Ren couldn't help but breathe a sigh of relief.

Since the military advisor explained that he crossed the river like this, then he Zhang Ren crossed the river like this, and he would not be poisoned.

After Zhang Ren led the army away, Zhuge Liang led the remaining 40,000 troops to press directly to the edge of Lushui and confronted the barbarian army across the river. Yunnan City, Zhuge Liang handed over to Zhang Yi to garrison, here is the front line of the Han army's southern expedition grain and grass is low, and there must be a general to garrison.

Zhang Yi was a general stationed in Yinan, and when Zhao Zilong came to Yunnan City, Zhang Yi also came over. And Zhang Yi, his ability may be limited, not as good as Zhao Zilong and Wu Yi, but there is no problem in guarding a Yunnan City.

……

At the same time, on the south bank of Lushui, Meng was given a military village.

Looking at the banners on the opposite bank, the endless Han army pressed to the edge of the Lushui, Meng Shu was both apprehensive and expectant.

What is worrying is that he has been defeated by the Han army once, and he has some psychological shadows, and at this time, seeing the Han army's strong formation, there will always be a thought in his heart: Can he beat the Han army this time?

Looking forward to it, Meng Shu was very much looking forward to the Han army being able to cross the river.

When the time comes, he will let the Han army know what it is to attack it half-crossing.

Although the Han army was brave, the water was poisonous, and their barbarian army did not need to shoot many Han troops, they only needed to get the Han army into the river, and their own river water would destroy the Han army that crossed the river.

It's a pity that the next action of the Han army on the other side made Meng Shu a little disappointed.

After the Han army arrived at the river, they did not cross the river, but set up camp on the other side of the river!

Is this to confront their barbarians across the river?

"King Meng, why didn't the Han army cross the river?" King Doth asked.

He came from afar, and for the rise of their barbarians, he traveled thousands of miles to lead the army from the depths of the jungle, just to fight the Han army. However, now that the Han army does not cross the river, how can he think of the king and fight a decisive battle with the Han army?

Of course, let King Duosi cross the river, and King Duosi never had such a plan.

"This is a trick of the Han army!" Meng replied.

"The Han army is confronting us across the river, and then wait for us to relax and then find an opportunity to cross the river."

Saying that, Meng Shu ordered again: "Pass the order, let the warriors guard the river bank, watch out day and night, and not relax in the slightest!" ”

At this time, I only heard Meng Wolf suddenly say: "Big brother, could this be what the Han Army is, what is the Ming Xiu and what is the secret crossing?" ”

Meng Shu and Meng Wolf are familiar with each other, and they get along with the Han people relatively closely, and they were once in Yunnan City, and they have heard some allusions among the Han people, but at this time, when Meng Wolf wants to use a certain allusion, he can't always think of it.

"What are you going to talk about?" Meng Shu frowned.

"Big brother, little brother is worried that the confrontation between the Han army on the other side and us is fake, and it is true to cross the river by detour." Meng Wolf explained.

"Take a detour to cross the river?"

"Where do you take a detour?"

"Nearly two hundred miles along this coast, guarded by our barbarian warriors, where can the Han army cross the river from a detour?" Meng asked rhetorically.

"According to this, more than 100 miles, the Shakou downstream of Lushui, where the water is shallow, will the Han army make a detour there to cross the river?" Meng Wolf worried.

Hearing this, Meng Shu laughed and said: "I sent warriors to guard the river bank for more than 200 miles, but I didn't care about the sand mouth a hundred miles downstream, why?" Your eldest brother just wants the Han army to cross the river from Shakou. ”

"The water in Shakou is shallow, and it is impossible to cross the river by raft, so you can only wade through the water."

"However, the Lushui is poisonous, wading through the water, no matter how many Han soldiers there are, no matter how brave they are, they will only be poisoned by the river!"

Hearing the eldest brother say this, Meng Wolf was relieved.

……

Let's talk about Zhang Ren.

Zhang Ren led the 4,000 soldiers of the headquarters, hurried slowly, and finally felt the sand mouth in the lower reaches of Lushui before sunset. With the explanation of the military advisor, Zhang Ren did not let the soldiers cross the river immediately, but gnawed some dry food on the spot, and then drank water to rest.

In addition, Zhang Ren also repeatedly ordered the soldiers that the river water was poisonous and they were not allowed to drink the drinking water here.

Night soon fell, and so did the hour.

Zhang Ren sent 100 soldiers to cross the river in advance to verify the correctness of crossing the river at the time of Zishi. In a short time, the 100 soldiers who crossed the river were indeed safe and sound. At this time, Zhang Ren waved his hand and shouted, "The whole army crosses the river!" ”

It took a stick of incense, and the four thousand soldiers crossed the river completely.

Zhang Ren looked at the sky, then lit a torch, took out the map, looked at it, and compared the distance on the map.

This map is a map of southern Xinjiang drawn by military advisors, which is more accurate than the map of southern Xinjiang drawn by them in Shudi.

"Let's go overnight!" Putting away the map, Zhang Ren ordered.

In fact, the soldiers had been running all day, and it was time to rest for the night.

However, judging from the map, Jiashanyu is more than 100 miles away from Shakou, and if they want to take Jiashanyu before sunset tomorrow, they need to travel overnight now.

……

It's dusk again, Jiashan valley, intersection.

Hundreds of barbarians, guarding thousands of barbarians, old and young, were carrying their shoulders and carrying them to the front line of Lushui. Seeing that the sun was about to set, these barbarians chose to camp in Jiashanyu for the night.

The climate here in southern Xinjiang is good, and it can be harvested three times a year, so the barbarians are not short of grain and grass.

Transporting grain and grass is a big burden.

The roads here in southern Xinjiang are not like those in the Central Plains. There are many mountain roads in southern Xinjiang, and the mountain roads in many places are not spacious. Therefore, the long-distance transportation of grain and grass in southern Xinjiang can only rely on manpower to carry it on the shoulder, and it is impossible to transport it by vehicle or livestock.