"Governor, you said that during the Sui Dynasty, Goguryeo was conquered three times, especially during the second expedition, so many cities in Goguryeo had already been conquered, why did you have to let them all out when you retreated, if you stick to it, won't you save a lot of things when you fight Goguryeo next time?"

The Tang Dynasty sailors sailed on the blue ocean, Wu Yuanqing got a chair to blow the sea breeze on the deck, and Liu Renliang, who had inspected the ship's post, also moved a chair to sit next to him, and after sitting down for a while, Liu Renliang couldn't stay still, and asked without anything to say.

"Yes, do you think they are stupid, they have to fight from Liaoshui every time."

Wu Yuanqing said this, which made Liu Renliang speechless, thinking that I asked you, not you asked me.

"That land has always been our Chinese place, and the earliest country was also established by the Chinese people. The four counties of Han, Lelang-gun, Xuansu-gun, Jinfan-gun, and Lintun-gun basically include most of the current Baekje and Silla, and as for Goguryeo, it has always been ours. It's just that there are always times when we can't do enough, so that these Xiaoxiao take advantage of us and encroach on the land, so when the strength is enough, future generations must take back what belongs to us." Wu Yuanqing was still babbling.

"Chief, these subordinates you said all know that we didn't send troops this time to get back our things, but the subordinates asked why they gave up later after they conquered those fortified cities during the former Sui Dynasty?" Liu Renliang once again brought the topic back to the question he wanted to know.

"Because Emperor Yang of Sui is stupid." Wu Yuanqing said casually.

"Boss, you can be serious." Liu Renliang felt that it was very powerless to be with such an unreliable chief manager, but this great benefactor who recommended him to serve as a sailor at the beginning, and he felt disrespectful in his heart.

Wu Yuanqing didn't understand this question before, because not only Emperor Yang of Sui conquered Goguryeo three times, but also Li Shimin sent troops to attack Goguryeo in the original time and space, just like Li Shimin's first attack on Goguryeo, he had already knocked down the first-line heavy cities of Goguryeo such as Gaimu City, Beisha City, Jian'an City, Liaodong City, and Baiyan City.

This is funny, what does it mean for the class to return to the court, that is, all the soldiers and horses returned to the court, and there was no garrison in any of the cities that were defeated, although the results were indeed very good, tens of thousands of beheaded, and the population of Goguryeo was moved back to seventy or eighty thousand, but the city beaten down by many dead and wounded soldiers was returned like that.

After the second attack on Goguryeo, you either have to attack the cities one by one, isn't this a broken brain.

Wu Yuanqing has always been very confused about why before, why don't you want to stick to the city you have built, even if you can't hold it all, you should hold one or two, then it can be regarded as inserting a nail in the enemy.

And look at the reason for the retreat, it is said that the weather in Liaodong is cold, the army food is about to run out, and it is difficult for the soldiers and horses to stay for a long time. Rub, it's cold, it's cold, but people are not dead, you live in the city after laying down so many cities, why can't you stay for a long time if you make a fire for heating, can the people of Liaodong stay, can't the Tang people stay, just kidding, and the military food has been exhausted, is there no grain in so many cities, there is no city, the people of Goguryeo always have it at home, they can feed the Goguryeo army, can't they get some food from them to feed the Tang army?

I don't understand, Wu Yuanqing is really very incomprehensible, in his opinion, if he occupies the city, he should always occupy it, what kind of food, what kind of cold and warm is not a problem at all.

Because the Tang Dynasty attacked Goguryeo every time, there were not many troops, only about 100,000 people, and it was not a problem to stay in the dozen or so cities that were defeated in Liaodong and hold on until the weather warmed up next year.

But in the original time and space, whether it was the Sui Dynasty or the Tang Dynasty, several attacks on Goguryeo almost ended with a lot of territory being defeated and retreating back as soon as it was cold.

Wu Yuanqing doesn't know how many times he scolded Emperor Yang of Sui and Li Shimin was stupid. But lately, I have learned why the two emperors, who are actually very shrewd, would do such a stupid thing.

I remember someone said that between Hebei and Liao in the northeast, the rainy season is in July of the old calendar, and the old calendar is from August, September to February and March is the freezing period. …… It will be after the frost period has passed, and the rainy season has not come in a short time to get a complete victory. Otherwise, the rain, mud, water, snow, and freezing will all be attacked by the army's soldiers and horses, and the transportation of food and grain will be very difficult, and if you encounter a fierce enemy who has held on for a long time, it will be useless or defeated."

It is said that it is precisely because of this that Li Shimin stationed his troops to fortify the city, and he was unable to attack for a long time and was unwilling to take the risk of attacking, so that when the freezing period of September came, he had to withdraw his troops in vain.

Is there a reason for this, maybe there is, but it's only for the offense, but the offense is not only for the Tang Dynasty, but also for Goguryeo, so this is not the deciding factor.

The most important point that Wu Yuanqing also just knew, that is, the characteristics of the life of the people of Goguryeo, Baekje, and Silla.

They also built the city like the Central Plains people, but after building the city, they didn't live on weekdays. Take the national capital of Goguryeo as an example, the national capital they built in Pyongyang is modeled after the Tang Dynasty and is also called Chang'an City.

Of course, there is no one in this surrounding country who does not learn from the Central Plains countries, not only the city is called Chang'an City, but the palace of the imperial palace is named after the names of some palaces in the Taiji Palace of the Tang Emperor.

But this is not important, back to the point, the Chang'an City built by the Goguryeo people will naturally not be as big as the Chang'an City of the Tang Dynasty, it is six miles from east to west, curves along the valley, and borders the Hunshui River in the south.

This city is not big, but it is not small, but although the city was built, people did not like to live in the city, and even the king of Goguryeo built a residential palace next to the city.

The king didn't live in the city, let alone the ordinary Goguryeo people, they also built houses outside the city by the mountains and rivers, anyway, they were all poor, not to mention the houses they repaired, they were short and narrow, and they couldn't stretch their legs when they slept horizontally.

This is something that later generations often see when they watch those TV series or movies made by sticks, especially those variety shows in the countryside, but it is not nonsense.

Then the king and the people live outside the city, so what is the purpose of building the city, the most important thing is to store weapons and equipment.

Even those who don't have special food reserves are kept outside the city, and the people's food is naturally kept at home.

Then when the enemy came, he entered the city and held out.

The result of this is that if the Goguryeo people themselves stick to the city, they don't have to worry too much about the food, if the Tang army fights over, and then the residents around the city are not blocked, then basically there will be no useful materials left for the Tang Dynasty, especially food, that guy, the Goguryeo people don't have much food at home, and they retreat directly on their backs as soon as they fight.

Such living habits made it impossible for the Tang Dynasty to scavenge some food from the people of Goguryeo, so they could only rely on logistics to replenish the heavy supplies, and once the supply was not timely, the Tang army had to withdraw, because there was no food, and it was impossible to hold the city alone, and they were starving to death.