''.
Sixth Northern Expedition In the summer of 253, Jiang Wei led tens of thousands of Shu troops from Shiying (石營; northwest of present-day
Xihe County, Gansu) to besiege Didao (狄道; around present-day
Lintao County,
Gansu). In response to the Shu invasion, the Wei regent
Sima Shi ordered his generals
Guo Huai and
Chen Tai to lead the Wei forces stationed in the
Guanzhong region to attack the invaders and lift the siege on Didao. Chen Tai attacked the Shu forces at Luomen (洛門; in present-day
Wushan County, Gansu) and defeated them. Jiang Wei eventually withdrew all his forces and retreated back to Shu when they ran out of food supplies.
Seventh Northern Expedition In the summer of 254, after the Shu government granted him authority to oversee internal and external military affairs, Jiang Wei led Shu forces to attack the Wei-controlled
Longxi Commandery again. Li Jian (李簡), the Wei official in charge of Didao (狄道; around present-day
Lintao County, Gansu), surrendered to Jiang Wei. Jiang Wei then pressed further to attack Xiangwu County (襄武縣; southeast of present-day
Longxi County, Gansu) and engaged the Wei general
Xu Zhi in battle. Xu Zhi was defeated and killed, but the Shu army also lost a general,
Zhang Ni. The victorious Shu forces then occupied three counties – Didao, Heguan (河關; in the vicinity of present-day Dingxi, Gansu) and
Lintao – and forced the residents to relocate to Shu-controlled territory.
Eighth Northern Expedition In 255, despite strong objection from a fellow Shu general
Zhang Yi, Jiang Wei went ahead with another campaign against Wei and even brought along Zhang Yi as his deputy. As the massive Shu army prepared to attack Didao (狄道; present-day
Lintao County, Gansu),
Wang Jing, the Wei governor of
Yong Province, sought help from the Wei general
Chen Tai. After suffering a disastrous defeat against Shu forces at the west bank of the
Tao River, Wang Jing and his remaining men retreated to Didao and took shelter inside the fortress. When Jiang Wei wanted to take advantage of the momentum to press on and besiege Didao, Zhang Yi advised him to stop advancing further because they would risk losing everything they had gained so far. Jiang Wei ignored him and ordered his forces to surround Didao. In the meantime, Chen Tai,
Deng Ai,
Sima Fu and other Wei officers led reinforcements to Didao to save Wang Jing. Chen Tai led his troops to the hills southeast of Didao, where they lit more fires and beat their war drums loudly to let the Wei forces in Didao know that reinforcements were on the way. As a result, the Wei forces in Didao experienced a surge in morale, and the Shu forces were taken by surprise. At the same time, Chen Tai also spread false news that they were planning to cut off the Shu army's retreat route. When Jiang Wei heard about it, he became fearful so on 11 November 255 he withdrew all the Shu forces and retreated to Zhongti (鐘堤; south of present-day Lintao County, Gansu).
Ninth Northern Expedition In the spring of 256, the Shu emperor
Liu Shan promoted Jiang Wei to the position of General-in-Chief (大將軍). In autumn, Jiang Wei led Shu forces from Zhongti (鐘堤; south of present-day
Lintao County,
Gansu) to conquer Mount Qi (祁山; the mountainous regions around present-day
Li County, Gansu) but failed because the Wei general
Deng Ai had anticipated the attack and already set up strong defences. Jiang Wei then attacked Deng Ai at Mount Wucheng (武城山; in present-day
Chencang District,
Baoji,
Shaanxi) but was driven back. Later, he led his troops across the
Wei River to launch a coordinated strike on Shanggui County (上邽縣; in present-day
Tianshui, Gansu) with another Shu force led by
Hu Ji. However, Hu Ji failed to show up in time so Jiang Wei came under attack by Deng Ai and his army sustained heavy casualties. As the Northern Expeditions took a huge toll on Shu's population and resources, the people increasingly resented Jiang Wei for his warmongering behaviour. In order to appease public anger, Jiang Wei wrote a
memorial to the Shu imperial court to take full responsibility for the failure of the ninth Northern Expedition and requested to be demoted as punishment. Liu Shan approved Jiang Wei's request and demoted him to the position of General of the Rear (後將軍) but allowed him to remain as acting General-in-Chief (大將軍).
Tenth Northern Expedition In 257, when the Wei general
Zhuge Dan started
a rebellion in Shouchun (壽春; present-day
Shou County,
Anhui), Jiang Wei decided to take advantage of the situation to stage another invasion of Wei. He led Shu forces to attack the Wei garrisons near the
Great Wall which were well-stocked with supplies but poorly defended. The Wei forces stationed there started panicking when they heard of the Shu army's approach. The Wei generals
Sima Wang and
Deng Ai led separate armies to the Great Wall to resist the Shu invaders. Jiang Wei then retreated to Mangshui (芒水; southeast of present-day
Zhouzhi County,
Shaanxi) and set up a camp there with its back facing a mountain. When the Wei forces encircled his position, Jiang Wei tried to taunt them to attack his camp but Sima Wang and Deng Ai ordered their troops to ignore the enemy and refrain from attacking. In 258, after Jiang Wei received news that Wei forces had suppressed Zhuge Dan's rebellion, he withdrew his troops and returned to the Shu capital
Chengdu. The Shu emperor
Liu Shan restored him to the position of General-in-Chief (大將軍). At the time, having seen year after year of battles against Wei, the people of Shu were growing tired of having to endure the costs and effects of war. The Shu official
Qiao Zhou also wrote the "Chou Guo Lun" (仇國論; "Disquisition on Rivalling States"), a satirical piece criticising Jiang Wei for his warmongering behaviour.
Eleventh Northern Expedition In the winter of 262, Jiang Wei led Shu forces to occupy Taoyang County (洮陽縣; in present-day
Lintao County,
Gansu) and attack Wei forces led by
Deng Ai at Houhe County (侯和縣) but they lost the battle. He retreated to Tazhong (沓中; northwest of present-day
Zhugqu County, Gansu) and garrisoned there.
Huang Hao's rise to power Jiang Wei knew that given his background as a defector from
Wei, he had to prove his loyalty to
Shu so he was eager to gain glory in battle. However, despite leading eleven campaigns against Wei, he had not made any significant achievements. While he was away at the frontline, the palace eunuch
Huang Hao, whom the emperor
Liu Shan favoured, gradually gained power in the Shu government and dominated the political scene. Huang Hao had a close partnership with the Shu general Yan Yu (閻宇) and he considered replacing Jiang Wei with Yan Yu as General-in-Chief. Jiang Wei had long suspected that Huang Hao had something against him so he remained in Tazhong (沓中; northwest of present-day
Zhugqu County,
Gansu) and did not return to
Chengdu after the eleventh Northern Expedition. The
Chronicles of Huayang recorded that Jiang Wei hated Huang Hao for his power-grabbing behaviour and once advised Liu Shan to execute the eunuch. However, Liu Shan refused and said: "Huang Hao is but a servant running errands for me. In the past, I was annoyed by
Dong Yun's deep hatred of him. Sir, why do you need to take this so personally?" Jiang Wei soon realised that he had a mistake in advising Liu Shan to execute Huang Hao because Huang Hao had strong influence in the Shu government, so he quickly excused himself and left. Liu Shan later instructed Huang Hao to visit Jiang Wei and apologise to him. Jiang Wei also managed to convince Huang Hao to let him remain in Tazhong to oversee agricultural production. His true intention, however, was to avoid getting caught up in a power struggle with Huang Hao in Chengdu. ==Fall of Shu==