Fall of Wu

Following Sun Quan's death and the ascension of the young Sun Liang as emperor in 252, the kingdom of Wu went into a period of steady decline. Successful Wei suppression of rebellions in the Huanian region by Sima Zhao and Sima Shi reduced any opportunity of Wu influence. The fall of Shu signalled a change in Wei politics. After Liu Shan surrendered to Wei, Sima Yan (grandson of Sima Yi), overthrew the Wei emperor and proclaimed his own dynasty of Jin in 264, ending forty-six years of Cao dominion in the north. After Jin's rise, Emperor Sun Xiu of Wu died, and his ministers gave the throne to Sun Hao. Sun Hao was a promising young man, but upon ascension he became a tyrant, killing or exiling all who dared oppose him in the court. In 269 Yang Hu, Jin commander in the south, started preparing for the invasion of Wu by ordering the construction of a fleet and the training of marines in Sichuan under Wang Jun. Four years later, Lu Kang, the last great general of Wu, died leaving no competent successor. The planned Jin offensive finally came in the winter of 279. Sima Yan launched five simultaneous offensives along the Yangzi River from Jianye to Jiangling whilst the Sichuan fleet sailed downriver to Jing province. Under the strain of such an enormous attack, the Wu forces collapsed and Jianye fell in the third month of 280. Emperor Sun Hao surrendered and was given a fiefdom on which to live out his days. This marked the end of the Three Kingdoms era, and the beginning of a break in the forthcoming 300 years of chaos.

Fall of Wei

Cao Huan succeeded to the throne in 260 after Cao Mao was killed by Sima Zhao. Soon after, Sima Zhao died and his title as Lord of Jin was inherited by his son Sima Yan. Sima Yan immediately began plotting to become Emperor but faced stiff opposition. However, due to advice from his advisors, Cao Huan decided the best course of action would be to abdicate, unlike his predecessor Cao Mao. Sima Yan seized the throne in 264 after forcing Cao Huan's abdication, effectively overthrowing the Wei Dynasty and establishing the successor Jin Dynasty. This situation was similar to the deposal of Emperor Xian of the Han Dynasty by Cao Pi, the founder of the Wei Dynasty.

The Fall of Shu

The decreasing strength of the Cao clan was mirrored by the decline of Shu. After Zhuge Liang's death, his position as Lieutenant counselor fell to Jiang Wan, Fei Yi and Dong Yun, in that order. But after 258, Shu politics became increasingly controlled by the eunuch faction and corruption rose. Despite the energetic efforts of Jiang Wei, Zhuge's protege, Shu was unable to secure any decisive achievement. In 263, Wei launched a three-pronged attack and the Shu army was forced into general retreat from Hanzhong. Jiang Wei hurriedly held a position at Jian'ge but he was outflanked by the Wei commander Deng Ai, who force-marched his army from Yinping through territory formerly considered impassable. By the winter of the year, the capital Chengdu fell due to the strategic invasion of Wei by Deng Ai who invaded Chengdu personally. The emperor Liu Shan thus surrendered. The state of Shu had come to an end after forty-three years.

Decline and End of the Three Kingdoms

From the late 230s tensions began to become visible between the imperial Cao clan and the Sima clan. Following the death of Cao Zhen, factionalism was evident between Cao Shuang and the Grand Commander Sima Yi. In deliberations, Cao Shuang placed his own supporters in important posts and excluded Sima Yi, whom he regarded as a dangerous threat. The power of the Sima clan, one of the great landowning families of the Han, was bolstered by Sima Yi's military victories. Additionally, Sima Yi was an extremely capable strategist and politician. In 238 he crushed the rebellion of Gongsun Yuan and brought the Liaodong region directly under central control. Ultimately, he outmaneuvered Cao Shuang in power play. Taking advantage of an excursion by the imperial clansmen to the Gaoping tombs, Sima undertook a putsch in Luoyang, forcing Cao Shuang's faction from authority. Many protested against the overwhelming power of the Sima family; notable among these were the Seven Sages of the bamboo groves. One of the sages, Xi Kang, was executed as part of the purges after Cao Shuang's downfall.

Wu and the South

In the times of Zhuge Liang's great northern offensives, the state of Wu had always been on the defensive against invasions from the north. The area around Hefei was the scene of many bitter battles and under constant pressure from Wei after the Battle of Red Cliffs. Warfare had grown so intense that many of the residents chose to migrate and resettle south of the Yangzi. After Zhuge Liang's death, attacks on the Huainan region intensified but nonetheless, Wei could not break through the line of the river defenses erected by Wu, which included the Ruxu fortress.
Sun Quan's long reign is regarded as a time of plenty for his southern state. Migrations from the north and the settlement of the Shanyue increased manpower for agriculture, especially along the lower reaches of the Yangzi and in Kuaiji commandery. River transport blossomed, with the construction of the Zhedong and Jiangnan canals. Trade with Shu flourished, with a huge influx of Shu cotton and the development of celadon and metal industries. Ocean transport was improved to such an extent that sea journeys were made to Manchuria and the island of Taiwan. In the south, Wu merchants reached Linyi (northern Vietnam) and Fu'nan (southern Vietnam). As the economy prospered, so too did the arts and culture. In the Yangzi delta, the first Buddhist influences reached the south from Luoyang.

Zhuge Liang's Northern Expeditions

 Zhuge Liang Modern Potrait

At the end of Zhuge Liang's southern campaign, the Wu-Shu alliance came to fruition and Shu was free to move against the north. In 227 Zhuge Liang transferred his main Shu armies to Hanzhong, and opened up the battle for the northwest with Wei. The next year, he ordered the general Zhao Yun to attack from Ji Gorge as a diversion while Zhuge himself led the main force to Qishan. The vanguard Ma Su, however, suffered a tactical defeat at Jieting and the Shu army was forced to withdraw. In the next six years Zhuge Liang attempted several more offensives, but supply problems limited the capacity for success. In 234 he led his last great northern offensive, reaching the Battle of Wuzhang Plains south of the Wei River. Due to the death of Zhuge Liang (234 AD), however, the Shu army was forced once again to withdraw, but were pursued by Wei. The Shu forces began to withdraw; Sima Yi deduced Zhuge's demise and ordered an attack. Shu struck back almost immediately, causing Sima Yi to second guess and allow Shu to withdraw successfully.

 Zhao Yun Modern Potrait

Consolidation

Liu Bei Modern Potrait

In 223 Liu Shan rose to the throne of Shu following his father's defeat and death. The defeat of Liu Bei at Yiling ended the period of hostility between Wu and Shu and both used the opportunity to concentrate on internal problems and the external enemy of Wei. For Sun Quan, the victory terminated his fears of Shu expansion into Jing province and he turned to the aborigines of the southeast, whom the Chinese collectively called the "Shanyue". A collection of successes against the rebellious tribesmen culminated in the victory of 224. In that year Zhuge Ke ended a three year siege of Danyang with the surrender of 100,000 Shanyue. Of these, 40,000 were drafted as auxiliaries into the Wu army. Meanwhile Shu was also experiencing troubles with the indigenous tribes of their south. The Southwestern Nanman peoples rose in revolt against Han authority, captured and looted the city of Yizhou. Zhuge Liang, recognising the importance of stability in the south, ordered the advance of the Shu armies in three columns against the Nanman. He fought a number of engagements against the chieftain Meng Huo, at the end of which Meng Huo submitted. A tribesman was allowed to reside at the Shu capital Chengdu as an official and the Nanman formed their own battalions within the Shu Han army.

 Meng Huo Modern Potrait