 Complete the following phrase:  Before Zhou Yu died, he, along with Gan Ning and others, had constantly urged Sun Quan to seize Yi Province covering present-day Sichuan and Chongqing from its governor, Liu Zhang. However, Zhou Yu died of illness while making preparations for an invasion of Yi Province. When Sun Quan asked Liu Bei for his opinion, Liu Bei, who secretly had the intention of seizing Yi Province for himself, lied to Sun Quan: Liu Zhang and I are members of the imperial clan, so we should strive to uphold the Han dynasty with the aid of our ancestors blessings. Now, when I heard that Liu Zhang has offended his neighbours, I feel afraid and dont dare to probe further. I hope you can show leniency towards him. If you dont, I will retire and return to the countryside. Liu Bei revealed his true intentions later when he attacked Liu Zhang himself and eventually seized control of Yi Province. During the campaign against Liu Zhang, Liu Bei left his general Guan Yu behind to guard Jing Province in his absence. When Sun Quan heard about 