So Cao Cao sent Cao Ren to deal with the rebellion .
Cao Cao became concerned about such developments in his rear , but his cousin Cao Ren observed that Liu Bei could not have too much control over his new men given by Yuan Shao .
So Cao Cao sent Cao Ren   to deal with the rebellion .
Cao Cao became concerned about such developments in his rear , but his cousin Cao Ren observed that Liu Bei could not have too much control over his new men given by Yuan Shao .