Wei Guan
In 268, Emperor Wu appointed Sima Zhou as Right Supervisor of the Masters of Writing (尚書右僕射) and General Who Pacifies the Army (撫軍將軍). In the following year, he reassigned Sima Zhou to be Senior General Who Guards the East (鎮東大將軍) and granted him imperial authority to replace Wei Guan in supervising military affairs in Xu Province. During his tenure, Sima Zhou instilled good discipline among the troops and earned much respect from them. The military leaders in the Jin dynasty's rival state, Eastern Wu, were very wary of him.