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In 228, Zhuge Liang declared that he would march through the Xie Gorge to take Mei County (郿縣; southeast of present-day Fufeng County, Shaanxi). He sent Zhao Yun and Deng Zhi as decoys to give the appearance of threatening Mei County and to occupy Ji County (冀縣; present-day Gangu County, Gansu). Cao Zhen led his armies to oppose them. Zhuge Liang personally led the armies to besiege Mount Qi; the ranks were ordered, discipline severe and authority apparent. The three commanderies of Nan'an, Tianshui, and Anding all revolted and defected from the Wei side to Zhuge Liang, sending shockwaves throughout Liang Province. Cao Rui moved to Chang'an to oversee the defences. Cao Zhen secured Mei County against Zhao Yun, while a combined cavalry-infantry force of 50,000 under Zhang He went west to oppose Zhuge Liang's main army.