Definition: In this task, you will be presented with a text and a pronoun. You should write the name that the pronoun refers to. Position of the pronoun in the text is showed within two "_"s.
Input: Next year, Cao Ren followed Cao Cao to attack Zhang Xiu, and was authorized to lead a separate command to raid the counties around, where he hijacked and enslaved several thousand residents. Zhang feigned surrender upon Cao Cao's arrival outside Wan, and attacked _his_ camp one night. <sep>, Pronoun: his

Cao Cao