 Complete the following phrase:  By 211, the situation in the south had stabilized and Cao Cao decided to crush his remaining enemies in the north, to the west of Changan in Zuopingyi Commandery. In Hanzhong commandery on the Han River, in the north of Yi Province, Zhang Lu lived in revolt against the Han dynasty, running his own theocratic state. Cao Cao sent Zhong Yao with an army to force Zhang Lus surrender. However, this disturbed a number of warlords in the Wei River valley and the wider 