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In the spring of 228, Zhuge Liang ordered Zhao Yun and Deng Zhi to lead a detachment of troops to Ji Valley (箕谷) and pretend to attack Mei County (郿縣; southeast of present-day Fufeng County, Shaanxi) via Xie Valley (斜谷). Their mission was to distract and hold the Wei forces' attention, while Zhuge Liang led the Shu main army to attack Mount Qi (祁山; the mountainous regions around present-day Li County, Gansu). In response to the Shu invasion, the Wei emperor Cao Rui sent Zhang He to attack Zhuge Liang at Mount Qi, and Cao Zhen to attack Zhao Yun and Deng Zhi at Ji Valley.