Historically, Emperor Yang Guang of the Sui Dynasty conquered Goguryeo three times, which indirectly led to the demise of the Sui Dynasty. Previously, Yang Guang destroyed the Chen Dynasty, destroyed Tuyuhun, and attacked the Turks, all of which fought beautifully, but he failed again and again to defeat a small country, Goguryeo. Even attacking the much more powerful Chen Dynasty, Turkic, Tuyuhun, etc., did not use seventy percent of the troops, a Goryeo with a population of millions and more than 100,000 troops, can it use more than one million troops, this is almost like sending troops to the country, and there are several times the logistics of the soldiers, how much food and financial resources are needed?

As soon as he conquered Goryeo, the king of Shandong began to rebel, perhaps at this time, it can be said that Yang Guang did not take these bandits and bandits to heart.

But during the second expedition to Goryeo, Yang Xuangan, the secretary of the military department, also rebelled, and the Hongnong Yang family was a big family in the Sui Dynasty, so there were countless important ministers and high-ranking officials who rebelled with him, and even some members of the royal family also participated, and the foundation of the ruling class of the Sui Dynasty began to waver.

Although Yang Guang extinguished Yang Xuangan's rebellion. However, due to the transfer of local troops from all over the country and the large casualties of the army during the expedition to Goryeo, the local government was unable to rehabilitate, and the fire of rebellion in various places became more and more intense, and hundreds of thousands of Turkic troops were stationed on the border, eyeing each other, so that the Sui Dynasty faced very serious internal and external difficulties.

But in this grim situation of internal and external troubles, Yang Guang actually had to conquer Goryeo three times, and did not hesitate to destroy the empire created by his father for a small northeastern country that could not threaten the core interests of the Sui Dynasty at all, is he a stupid dumb monarch? Judging from his previous performance, this is completely inconsistent!

Yu Wenming could conclude that with Yang Guang's eloquence, he knew better than anyone else the consequences of doing so.

Moreover, the combat effectiveness of the Sui army is extremely strong, and he almost won every battle before conquering Goryeo, and he also personally destroyed the Chen Dynasty and Tuyuhun, and also defeated *** to surrender. However, the expedition to Goryeo killed and wounded millions of troops, but in the end, it did not even hurt the foundation of a small country, and only occupied the land of Liaoxi, which is really regrettable.

Is it because Yang Guang doesn't understand military affairs? The battle to defeat Nanchen was that he served as the coach. The 20-year expedition against the Turks was also commanded by him, and the destruction of Tuyuhun was also the result of his personal expedition, how could he not understand military affairs?

In the end, Yang Guang wanted to bury all the entire northern armies controlled by the Guanlong nobles, and then transfer the southern army to the north to completely cripple the power of the Guanlong nobles in the army, and in addition, he could drag Goryeo to death and remove both internal and external threats.

Facts have proved that Yang Guang did greatly weaken the power of the Guanlong nobles and the scholar clan through the three expeditions to Goryeo, which can be seen from the alternation of the Sui and Tang dynasties: none of the leaders of the northern secession forces are the original families, although Li Yuan is also a member of the Li Valve, but he is a side branch of the Li Valve, and the head of the Li Valve at that time was Li Hun. If Li Yuan hadn't been cousins with Yang Guang and had the status of a relative, I was afraid that he wouldn't even be able to take the seat left in Taiyuan.

But why was Yang Guang so eager to attack the Guanlong nobles?

In fact, just look at the situation that Yang Guang faced at that time: when the foreign nobles controlled the government and the army, the royal family of the Sui Dynasty was thin.

Yang Guang's brothers were all killed by him or died young. His heirs were also thin. Among the three sons, the eldest son Yang Zhao died early, the second son Yang Huang was not angry, and the third son Yang Gao was as young as several grandsons.

Therefore, Yang Guangcai was anxious to eliminate the threat of the Guanlong nobles as soon as possible, and he was using the expedition to Goryeo to make a big gamble, using the Great Sui Empire as a bet. He hoped to completely eradicate the power of the Guanlong nobles, the biggest threat to the Great Sui, in the army, remove their backbone, and change them into the Guanlong clan. Confront the Shandong Shi clan and the southern Shi clan.

In this way, the three major interest groups of the Great Sui will be firmly in his hands, and form a check and balance with each other, so that the Sui Dynasty can have long-term peace and stability.

Therefore, on the one hand, Yang Guang was severely cracking down on some tyrannical people of the Guanlong aristocracy, such as the Yuan clan and the Dugu clan; On the other hand, he continued to use some moderates among the Guanlong aristocracy, such as the Yuwen clan and the Li clan, and Li Yuan, who was his cousin.

But this shocking gamble against the Guanlong aristocracy, Yang Guang still lost in the end. His cousin, Li Yuan, who was gentle and cowardly on the surface, raised troops in Taiyuan with the support of Guanlong's forces and established the Tang Dynasty in Guanzhong.

The land of Guanlong has always been the main source of troops for the Sui army, and it has many and powerful soldiers. In addition, after the Battle of Goryeo and the uprising of the rebels in the Central Plains, a large number of government soldiers fled back to Guanlong, so that the Tang army had an extremely good source of soldiers.

Moreover, the Guanlong nobles had a large amount of money and food savings. In the Sui Dynasty, there was a saying that "the wealth of the world is ten, and five points are in Guanlong". It was with the full support of the Guanlong nobles that the Tang army could have enough money and food, and the soldiers served their orders.

People, money, and materials plus the will of the people are the fundamental reasons why the Tang Army was able to quickly defeat various forces and unify the world in history, and it is definitely not the reason for Li Shimin's personal heroic talent and the so-called generals of Tiance Mansion.

Therefore, the Guanlong nobles still won this earth-shattering gamble in the end.

As a person of later generations, Yu Wenming is more aware that the hidden danger of the Sui Dynasty is not only the Guanlong aristocracy, the anti-Sui Dynasty uprising first broke out from Qi County, Qinghe County, Pingyuan County and other places, it is by no means a simple peasant uprising, but has an extremely profound historical background.

These areas were the core ruling areas of the original Northern Qi Dynasty, and the people were brave and fierce, and there were many relics of the Northern Qi Dynasty, and they were also generally dissatisfied with the Sui Dynasty, such as Liu Badao, Meng Rang and others. The so-called peasant uprising at the end of the Sui Dynasty, the peasants were actually just cannon fodder, just like Zhai Rang finally used Li Mi as a stepping stone. After all, the peasant revolt will be extinguished by the nobles of the family.

This night, Yu Wenming and Yu Wenshu talked all night, and he finally deeply realized that his grandfather still has a much more unique vision, and he has a very thorough understanding of the reasons why Yang Guang did this. In contrast, during the march before, his master Li Jing did not see as deeply as he did. I just thought that the saint was so happy and wanted to put on a show, so he mobilized so many troops to attack a small country.

And now Yu Wenming's words have made Yu Wenming very clear what he should do now.

In this troubled world, if you don't advance, you will retreat, whether it is the self-preservation of fame and fortune, or the division of lofty ambitions, or the ambition to dominate the world, you need to be gradual and not impatient and short-sighted. Otherwise, Yang Guang's mistake will be repeated.