The weather in Shu Han

Cao Cao was defeated by Sun Liu's allied forces in Battle of Red Cliffs, which made Cao Wei's regime lose the opportunity to unify the world and opened the prelude to the coexistence of the three countries. Guan Yu once had a great influence on China in the battle of Xiangfan, but after Sun Quan attacked Jingzhou and defeated Maicheng, he was captured and beheaded, and the Shu-Han forces withdrew from Jingzhou. The defeat of Liu Bei in the Yiling War made Shu Han lose the ability to seize the Central Plains forever, and became the separatist regime occupying the southwest and the weakest force among the three countries.

Everything has two sides. It is precisely because of the successive defeats of Shu Han in the wars of Xiangfan and Yiling that the already weak Shu Han regime became even weaker. In the eyes of Cao Wei and Wu Dong regime, Shu Han was a force to survive, so it was not easy to survive and it was impossible to wage war with foreign countries. Therefore, both Cao Wei and Wu Dong believe that the Shuhan regime does not have the threat and strength to actively wage war overseas.

Liu Bei proclaimed himself emperor. Therefore, when Zhuge Liang began the fifth Northern Expedition in 228 AD, the shock to the Cao Wei regime was quite great. Cao Wei didn't understand why Shu Han still had the strength to challenge himself. In fact, Cao Wei used more than 70% of the country's military strength to deal with the Dongwu regime. For Shu Han, Cao Wei's troops at the border were less than 20%, and his defense was relaxed. He didn't take Shu Han seriously at all.

During the nine years from AD 2 19 to AD 228, there were two main reasons why Cao Wei did not intend to destroy Shu Han: First, Shu Han was defeated twice, and his strength was too weak to pose a threat to Cao Wei, at least Cao Wei thought so. Second, the junction of Cao Wei and Shu Han is Qinchuan, which is 800 miles away from Guanzhong and Hanzhong. The road here is too difficult to walk and the traffic is very inconvenient. Cao Cao was forced to quit Hanzhong because of poor traffic supply.

After Zhuge Liang's Northern Expedition in the Battle of Yiling, Cao Wei's views on Shu Han changed. Zhuge Liang, with his superhuman personal ability, made Shu Han have the strength to wage war with foreign countries. No one but Zhuge Liang has such ability, even Sima Yi can only use the war of attrition to resist Zhuge Liang's northern expedition.

During Zhuge Liang's Northern Expedition, Cao Wei had a plan to destroy Shu Han, which was mainly put forward by Cao Zhen, commander-in-chief of Cao Wei's Guanzhong Military Region, and put into practice. Cao Zhen led an army to attack Shu Han from the Meridian Valley, but he hasn't left the Meridian Valley for a month, because the road is difficult to walk, because the weather is changeable, and because transportation and supply are inconvenient. In this way, Cao Zhen returned from the original road, and finally Cao Wei had the idea of eliminating Shu Han.

Cao Zhen cut Shu because Cao Zhen had tried it, so it was not easy to destroy it. Therefore, Cao Wei lost the idea of destroying it for a long time and only kept it. Even after Zhuge Liang's death, Sima Yi wrote to Wei Mingdi and Cao Rui, hoping to attack Shu Han for the same reason as Cao Zhen. However, although Cao Wei strengthened his defense against Shu Han, Cao Wei still did not regard Shu Han as the biggest enemy, and Cao Wei's main force was still there.

During the period of 16 from AD 228 to AD 244, Cao Wei had a plan to destroy Shu Han, but it could not be realized in reality, so he gave up and returned to the previous state, no longer aiming at destroying Shu Han. There are two reasons: first, the road is difficult to walk, mainly the 800-mile Qinchuan, which is the same as the previous reasons.

Secondly, Shu Han was not the only enemy of Cao Wei. The biggest enemy of Cao Wei is the Dongwu regime, in addition to the Xiongnu in the northwest, Xianbei, Wuhuan in the northeast and even the Gongsun regime in Liaodong. In addition, it is very difficult to eliminate Shu Han, so Cao Wei targeted the Huns, Xianbei people, Wuhuan people and Gongsun regime in Liaodong one year before Zhuge Liang died.

But after these two enemies were destroyed, Cao Wei began to enter a period of depression. This depression period means that the emperor Cao Wei became a puppet and Cao Wei began to enter a period of internal struggle. But before that, in 244 AD, Cao Shuang attacked Shu. This is a farce. Cao Shuang didn't make any achievements, just wanted to gain some political capital by pacifying the weakest Shu Han. However, due to Cao Shuang's poor ability, the road between the two countries is difficult.

Five years later, Cao Shuang was beheaded by Sima Yi through the coup in Ping Ling, and the Cao Wei regime entered the era of Sima Shi's power, which was the climax of Cao Wei's internal struggle. From AD 244 to AD 263, Cao Wei waged fierce military and political struggles, mainly including the following points:

1, Huainan Three Rebellions. These three rebellions were all launched against the Wei State of Sima, all against the Sima family, but they all ended in failure, but it is enough to show that the Cao Wei regime controlled by the Sima family is not monolithic, and there are many opponents.

2. Sima Shi abolished Wei Di Cao Fang. Sima Shi got the news in advance because Cao Fang wanted to depose him in a coup, took action to depose Emperor Cao Fang, wiped out all the ministers involved, and made Cao Mao emperor.

Si Mazhao killed Cao Mao in Di Wei. Xelloss didn't want to be Wang Wei because Sima Dai-wei's progress was accelerated, so Xelloss launched a suicide coup in Si Mazhao. As a result, Cao Pi was killed, which caused the shock of Wei's ruling and opposition, and also brought the process of Wei in Sima Dynasty to an abrupt end.

Because of a series of internal problems, it is impossible for Cao Wei to wage war abroad, so he can only integrate his internal affairs first, and only after the internal affairs are fully integrated can he have the strength to fight abroad. So three years later, Si Mazhao integrated its internal affairs and started to launch foreign wars to divert attention. Si Mazhao chose to wait and see, and it was most appropriate to attack Shu Han, because Dongwu was powerful and had the natural barrier of the Yangtze River. Wei lacks warships and water forces, but attacking is a difficult road.

In 263, Wei destroyed Shu, so Si Mazhao decided to attack Shu Han. Even so, in North Korea, only a few people, such as Zhong Hui, support it. Even front-line generals like Wargo do not support cutting Shu. You should know that Wargo fought against Jiang Wei all the year round in the front line of Guanzhong, and the purpose of Si Mazhao's attack on Shu was to divert attention, not to destroy it, nor to ensure it.

If it weren't for Wargo's smuggling in the level tone trail in the 700-mile no-man's land, the 100,000-strong army led by Zhong Hui would have retreated back long ago. Because Jiang Wei blocked Jiange, Zhong Hui could not move forward, so no one thought that this war would really perish. This was a complete mistake, but the result was that Liu Chan surrendered and Shu Han perished.