In 211 AD, following Cao Cao’s consolidation of power in central China, he ordered Zhong Yao, Inspector of Sili, and Xiahou Yuan, General Who Protects the West, to assemble troops for a campaign ostensibly aimed at Zhang Lu in Hanzhong. However, the warlords of Guanzhong (the Guanzhong Plain) – notably Ma Chao and Han…