Time began to enter winter, and it was not until this time that Li Yu knew that the winter of this year was really cold!

If you want to talk about the modern southern region, even in the middle of winter, it is estimated that there are more than ten degrees. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 info It's not the outside temperature that's cold to a large extent, it's the howling winter wind.

But in this era, snowflakes fall in the south, where there is hardly any snow. Li Yu didn't know the temperature, but it must have dropped to below zero. It is worthy of the ancient times when there was no greenhouse effect, and I don't know why I miss the greenhouse effect a little.

"Teacher, what is this?" Zu Lang asked, pointing to the somewhat earth-like thing in front of him.

At the moment, he wrapped himself in a fur, and in fact most people do. The people of the Central Plains are more bitter, not to mention the cold weather in winter, don't count on the fur, a winter is either the old man is gone, or the child is gone.

The average age was forty years old, and this was not counting the time of the war, and the lack of warm clothing was also an important factor.

"Wait a minute, and let the teacher burn the charcoal at the mouth of the kang first!" Li Yu couldn't tell if this thing was firmly secure, but the means of discharging exhaust gases were arranged, and a chimney led to the outside, so that it would not be poisoned by gas.

The firewood was lit and the whole earthen platform was warmed.

Li Yu touched it, then directly untied his fur and jumped up, and even jumped on it. I have to say that this improvised thing is quite sturdy, after all, without bricks and cement, he can't be sure.

This thing is the common fire kang in the north in later generations. After Li Yu realized the cold of winter, it took two days to find someone to build it. It's about ten square meters, and he plans to eat and sleep all winter, and he will solve it all over the winter, anyway, TMD won't go into the pit!

Those traversers, who are not afraid of the cold in winter, let him not be afraid of the cold, anyway, he is the most afraid of the cold! It's not that I haven't thought about exchanging a down jacket or cotton coat, but how can you go down the mountain casually when the snow covers the mountain, and you can't conjure up a down jacket or duvet out of thin air if you can't go down the mountain, right? It's also stupid to say that I underestimate the cold of winter!

"Come up! It's comfortable here! Li Yu lay on the kang and said very comfortably.

Zu Lang was also suspicious, first touched the edge of the kang, and then his eyes lit up, and he immediately lifted his fur fur and jumped up. Sure enough, the whole person suddenly warmed up, but he didn't want to get off the kang anymore.

"Teacher, this thing is amazing!" Zu Lang also said comfortably at this moment.

"It is said that it is used for heating by foreign races in the north, and I don't know if it is, but I didn't expect it to work. Don't be idle, take everyone with you and build one for each family! And over there in the school, it's too painful to go to class without this thing! Li Yu didn't intend to let Zu Lang be idle, and ordered directly.

"Let the disciple stay for a while......" Zu Lang was a little reluctant.

"Go quickly, go quickly, I don't know how many people will be frozen when it's late! Especially those little kids, there is no cure for them when they freeze! Li Yu kicked him off the kang.

"Yui!" Zu Lang reluctantly wrapped the fur fur on the ground around his body again, so he reluctantly replied.

The villagers knew the benefits of this thing, and immediately stopped staying at home, and burst out with enthusiasm. It took less than ten days for the whole village to build a kang in every house. Slightly different from later generations, almost all of them are women, after all, the social status of women in these years is not high.

Li Yu wanted to improve this, but he also knew that it was a gradual process. In front of him, there is more than this resistance, especially this is one of the biggest obstacles, unless there is a perfect plan, Li Yu does not plan to open in this regard.

It is not denied that he actually enjoys the benefits of this system. However, the liberation of the labor force is an inevitable trend, so the advancement of women is also an inevitable trend.

In winter, there is nothing to do, there are no wild vegetables to pick and no fields to cultivate. All the fields have been turned over, and the winter snowflakes will freeze all the eggs in the fields.

After the ondol, the demand for firewood and charcoal increased, and Li Yu had the intention of opening a charcoal field, but there was a shortage of labor. Unless the population of the village increases, it is estimated that there will be no way.

There are too many things to do in winter, so the winter special training class comes out. Li Yu really plans to teach everything he can teach in a short period of time. In addition, there are 300 members of the security forces, who only need to participate in night training, but the amount of training per day has tripled.

Li Yu had already made a plan, and after the winter, he began to negotiate with the surrounding villages, trying to merge all the villages within a hundred miles of the surrounding villages. This method of attacking one's own people is somewhat immoral. However, compared with those unreliable people under the mountain, the existence of the same mountain people is more reliable.

"Mountain warfare is nothing more than two kinds of shooting: stealth shooting and close-range killing." Li Yu is also a part-time instructor at the moment, he is actually not familiar with mountain warfare, but he can talk about how good the novel is.

"In fact, in addition to the commonly used bows and arrows, this kind of blow pipe is ignored. This thing only needs a piece of hollow bamboo to craft, and the arrowhead only needs to be smeared with the sap of the Bloody Throat Tree to use it. Li Yu took out a blow pipe, this thing is actually not long, about two to three meters. The material of the blow arrow is mainly thin bamboo branches, which cannot fly far but does not need to fly far.

All it takes is an arrow stained with venom, and even if it stabs the enemy's skin two meters apart, it can be fatal. Blowing out the poisoned arrow and quickly fleeing will definitely give the enemy a headache.

As for being mean, what is there to be mean on the battlefield? Either you die or I live, let the officials and soldiers capture the village, and no one in the villagers will survive!

After Li Yu's explanation, and many guards' personal experiments, they found that this thing is also practical. It's just that if you want to increase the range and power, it's better to use iron. It's just that where the mountain people can get iron so easily, just think about it.

Later, Li Yu explained how to use the jungle to hide himself, and how to use the complex terrain to lure the enemy. Even made some wrong signs in the mountains and forests to mislead the other party or something, Zu Lang and they were stunned for a moment. The admiration for Li Yu is naturally like the Yangtze River flowing endlessly, and like the Yellow River flooding out of control!

So, Li Yu took the opportunity to increase their training amount, especially in terms of physical fitness. Since ancient times, the army has focused on training battle formations, but the strength of the army is basically done spontaneously by the soldiers, and it is not scientific. These guards tossed and turned after such a winter...... Training hard, physical coordination and flexibility should improve a lot.

On this day, Li Yu was leading the soldiers to practice, and Ouyang Xing was temporarily in charge of teaching. But I didn't want to practice for an hour, and a wolf smoke rose from the direction of the village, but it was a signal that the enemy was approaching.

Everyone immediately returned to the defense, and when they returned to the village, they could already see the enemy's traces, but the intruder was not human......