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In winter 550, Xiao Ji departed Chengdu with his forces and headed east on the Yangtze River. Xiao Yi, suspicious of Xiao Ji's intentions, sent him letter to halt him, stating, "The people of Bashu [i.e., Yi Province and surrounding regions] are brave but ferocious, and they easily get emotional and difficult to control. I need you, my brother, to watch over them, so that I can destroy the bandit [i.e., Hou Jing]." He also attached a note, "Based on geography, you and I are like Liu Bei and Sun Quan, and we should each be satisfied with our territory. Based on our blood, we are like the states of Lu and Wei, and we can continuously communicate." Apparently in reaction to Xiao Yi's letter, Xiao Ji returned to Chengdu. Meanwhile, he sent the generals Yang Qianyun () and Qiao Yan () against Yang Fachen. In spring 551, Yang Qianyun defeated Yang Fachen, dislodging him and forcing him to flee, but Yang Qianyun then withdrew without capturing Yang Fachen.