Xincheng Rebellion
| Xincheng Rebellion | |||||||||
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| Part of the wars of the Three Kingdoms period | |||||||||
 An illustration of Meng Da being slain by Sima Yi's men |
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| Belligerents | |||||||||
| Cao Wei |
Meng Da (with some support from Shu Han and Eastern Wu) |
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| Commanders and leaders | |||||||||
| Sima Yi |  Meng Da |
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| Xincheng Rebellion | |||||||
| Traditional Chinese | 新城之亂 | ||||||
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| Simplified Chinese | 新城之乱 | ||||||
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| Transcriptions | |
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| Standard Mandarin | |
| Hanyu Pinyin | Xīnchéng zhī luàn |
The Xincheng Rebellion was a revolt that took place in the state of Cao Wei between late 227 and early 228 CE during the Three Kingdoms period. The rebellion was initiated by Meng Da, a former Shu Han general who defected to Wei and was placed in charge of Xincheng Commandery (located in the vicinity of present-day northwestern Hubei) in Jing Province. The revolt was swiftly suppressed within a month by the Wei general Sima Yi. Meng Da was captured and executed.
In 220, Meng Da, a general who formerly served the warlord Liu Bei, defected over to Liu's rival Cao Pi, who had inherited the title of a vassal king – "King of Wei" – from his recently deceased father, Cao Cao. Meng Da brought along his subordinates and their families, numbering over 4,000 in total. Cao Pi was pleased when he heard that Meng Da had come to join him, and he gave Meng a warm welcome. Cao Pi appointed Meng Da as the Administrator (太守) of Xincheng (新城) Commandery, which was located along the southwestern border of Wei.
At the time, many officials felt that Meng Da was untrustworthy and should not be given important responsibilities. The Wei general Sima Yi, who was stationed at Wan (宛; present-day Wancheng District, Nanyang, Henan) and oversaw the military affairs of Jing and Yu provinces at the time, also cautioned Cao Pi against putting too much faith in Meng Da, but Cao did not heed Sima's advice.
Meng Da was deeply favoured by Cao Pi, and he was also close friends with the Wei officials Huan Jie and Xiahou Shang. When Cao Pi died in 226, Huan Jie and Xiahou Shang had also died. Meng Da started feeling uneasy because he had been on the front line for a long time. Throughout Meng Da's service in Xincheng, he had been friendly with Eastern Wu (a state founded by Sun Quan) and had established strong defences against possible attacks from Wei's rival state Shu Han (founded by Liu Bei). Shu's chancellor-regent, Zhuge Liang, hated Meng Da for being capricious, and was also worried that Meng would become a threat to Shu.
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