Sima Yi, Chen Qun, Wu Zhen, and Zhu Shuo are known as the "Four Friends".

Since then, Sima Yi has often planned state affairs and made many strange strategies. Soon, Sima Yi became the prime minister, and suggested that Tuntian solve the food problem, which was adopted by Cao Cao.

Sima Yi pointed out that Hu Xiu, the assassin of Jingzhou, was rude, and Nanxiang was too guarded by Fu Fang and arrogant, so they should not be stationed at the border, and Cao Cao did not pay attention to it. In June of the same year, after Liu Bei succeeded to Hanzhong, he sent Meng Da and Liu Feng to capture Fangling, Shangyong and other places in the eastern part of Hanzhong County, and his power expanded. In July, Sun Quan wanted to attack Hefei, and most of the Wei army mobilized Huainan to defend the Wu army.

Guan Yu, who was guarding Jingzhou, took this opportunity to lead the main force to attack Jingxiang in the north. Siege Wei general Cao Ren, flooded the Forbidden Seventh Army, and beheaded Pang De. Hu and Fu really took the opportunity to descend to Shu.

…… ……

For a time, Guan Yu's momentum was "mighty in China", because Emperor Xian of the Han Dynasty was in Xu County, very close to Fancheng, Cao Cao felt threatened, and in order to avoid Guan Yu's edge, he was once ready to move the capital to the north of the Yellow River.

Sima Yi and Cao Rafter Jiang Ji promptly dissuaded: "Yu Ban was drowned by the water army, it was not a mistake in battle and defense, and there was no big loss to the overall situation of the country. Liu Bei and Sun Quan are close to each other, and now that Guan Yu is sitting big, Sun Quan must be even more unhappy, and tell Sun Quan about this, so that he can contain Guan Yu, and the siege of Fancheng will be relieved. ”

Cao Cao followed his plan, Sun Quan really sent Lü Meng to attack the public security, and Guan Yu was captured and killed by him.

This battle took advantage of the contradiction between Sun and Liu to fight for Jingzhou, made full use of diplomatic strategy, and reaped the benefits, which not only thwarted Guan Yu's powerful offensive and lifted the siege of Fancheng, but also made Zhuge Liang's original plan to attack the Central Plains all the way to Wanluo and Qinchuan on both sides could not be realized. More importantly, it undermined the alliance between Sun and Liu, changed the strategic pattern at that time, and the Cao clan seized the initiative.

Later, Cao Cao believed that the remnants of Jingzhou and the soldiers and civilians in Yingchuan Tuntian were approaching the southern bandits and wanted to move them away. Sima Yi believes: "Jing Chu is easy to take off, easy to move and difficult to be safe. Guan Yu is newly broken, and all the evildoers are hiding and watching. Those who are good now, not only will hurt their will, but will make those who have gone dare not return. ”

Cao Cao listened to his advice and did not emigrate. The fugitives who had fled from Tibet before had indeed returned to naturalization.

…… ……

Cao Cao died, the government and the opposition were in danger, and Sima Yi managed the funeral, both inside and outside.

In the same year, Cao Pi was the throne of Wei, and Sima Yi was awarded the title of Marquis of Hejin Pavilion and became prime minister for a long time.

At that time, Sun Quan was leading his army westward. The courtiers thought that Fancheng and Xiangyang lacked food and could not resist the Wu army, so they called the guard general Cao Ren back to Wancheng.

Sima Yi believed, "Sun Quan has just defeated Guan Yu, and when he wants to get along with Wei, he must not dare to make trouble." Xiangyang is an important place for land and water transportation, and it cannot be abandoned. ”

Cao Pi did not listen to his advice and ordered Cao Ren to set fire to the second city.

The Cao family was always skeptical of Sima Yi and did not listen to his advice at first.

Later, Sun Quan really did not come to invade, and Cao Pi regretted it.

…… ……

Cao Pi ascended the throne of the emperor and was known as Emperor Wen of Wei in history. After ascending the throne, Sima Yi was appointed as Shangshu, and soon transferred to the overseer, Yushi Zhongcheng, and was named the Marquis of Anguo.

In the second year of the early Huang dynasty (221), he was removed from the post of overseer and promoted to the position of servant and the right servant of Shangshu.

Subsequently, Cao Pi attacked Wu twice, both with Sima Yi guarding Xuchang, and changed the title of Sima Yi to Xiang Xiang. In February of the sixth year of the Huang Dynasty (225), he was transferred to the general of the Fujun Army and the False Festival, leading 5,000 soldiers, and adding to the matter and recording the Shangshu.

Sima Yi resigned, and Cao Pi said: "I am in the affairs of the people, night after day, and there is no need to rest for a moment." This is not pride, but sorrow. ”

In the same year, Cao Pi raised a large army to attack Wu, but still ordered Sima Yi to stay behind, "the people in the inner town, and the military resources outside".

Before leaving, he sent an edict to Sima Yi and said: "I am deeply concerned about the future, so I will be the secretary." Although Cao Shen has military exploits, Xiao He is important. So that I don't have to worry about the West, no! ”

Later, Cao Pi returned to Luoyang from Guangling, and issued an edict to Sima Yi: "Wudong, Fujun should be the chief of the west; Wuxi, Fu Jun is the general affairs of the east. ”

So Sima Yi stayed in Xuchang.

During this period, Sima Yina married a woman surnamed Fu as a concubine, and Fu gave birth to four sons to Sima Yi in one go: Sima Liang, Sima Xuan (伷zhòu), Sima Jing, and Sima Jun!

Fu is good at giving birth, and he is a man, meritorious, low-key all his life, his wife Zhang Chunhua has no difficulty for her, and she is rich and good.

…… ……

Cao Pi died at the age of forty. When he was dying, he made Sima Yi and Cao Zhen, the general of the Chinese army, Chen Qun, the general of the Zhenjun, and Cao Xiu, the general of the Eastern Expedition, as auxiliary ministers.

Cao Pi to the crown prince Cao Rong (叡

ui) said: "There are three public people, be careful. ”

Cao Rong (叡

ui) ascended the throne and changed the title of Sima Yi to the Marquis of Wuyang.

When Sun Quan learned of the death of Emperor Wen of Wei, he sent troops to attack Wei in August. He ordered Zhuge Jin and Zhang Babing to attack Xiangyang in two ways, and personally led the army to attack Jiangxia County.

Sima Yi repelled Sun Quan, defeated Zhuge Jin, and beheaded Zhang Ba, beheading more than a thousand ranks. In December, he was promoted to hussar general.

…… ……

In June of the first year of Taihe (227), Emperor Wei Ming ordered Sima Yi to garrison Wancheng and supervise the military forces of Jing and Henan. When Shu surrendered Meng Da to Wei, the Wei Dynasty treated him very kindly, and Sima Yi thought that he was clever in his words and deeds and could not be trusted. But the emperor didn't listen, and appointed Meng Da to lead the new city to be too guarded, a marquis, and a fake festival.

After Cao Pi's death, Meng Da fell out of favor, and Zhuge Liang, the prime minister of Shu, secretly corresponded with him and plotted to betray Wei. Zhuge Liang was afraid that his words and deeds would be capricious, and wanted to urge him to rebel quickly, knowing that Wei Xing was too protective of Shen Yi and had a conflict with him, so he sent Guo Mo to Shen Yi to deceive him, intending to leak his matter. When Meng Da heard of this, he prepared to raise troops immediately.

After Shen Yi told Sima Yi about this matter, Sima Yi was afraid that he would suddenly attack, so he sent him a letter of consolation, which said: "The general abandoned Liu Bei in the past and entrusted himself to the country. The Shu people are stupid and wise, and they can't help but gnash their teeth at the general. Zhuge Liang wants to break each other, but there is no way to suffer. What the model says, it is not a trivial matter, and it is easy to know how to reveal it. ”

Meng Da was overjoyed and hesitated.

Sima Yi secretly led the army to discuss, and the generals saw the handover between Meng Da and Wu Shu, and persuaded Sima Yi to watch first and then move. Sima Yi said: "If there is no faith, when they are in doubt, they should be undecided. ”

Sima Yi personally led the army to attack Mengda day and night, and arrived at the city of Xincheng in eight days. Wu and Shu sent reinforcements to rescue Meng Da, but they were stopped by Sima Yi's troops in Anqiao, Mulansai and other places in Xicheng.

Previously, Zhuge Liang had warned Meng Da to step up precautions, and Meng Da wrote to Zhuge Liang that "Wancheng and Luoyang are eight hundred miles apart, one thousand two hundred miles away from me, and the table is given to the Son of Heaven, and the round trip takes less than a month, and at that time my city has been repaired, and all the armies are ready." The terrain where I am stationed is very dangerous, and Sima Gong will not come in person, and the other troops will not be troubled in the future."

And Sima Yi cut first and then played, only eight days before the army came to the city, Meng Da wrote to Zhuge Liang again, exclaiming: "I raised things, and the troops arrived under the city on the eighth day, how fast!" ”