Liu Jie came from an elite background and had over 1,000 retainers under him. Some of them were actually robbers and bandits, while others were corrupt bureaucrats. When it was time for Wang Tong () and some other retainers under Liu Jie to serve in the army, Sima Zhi's personal assistants reminded their superior that Liu Jie had never allowed anyone from his household to perform mandatory military service. Sima Zhi then wrote a letter to Liu Jie as follows: "Sir, you come from an influential family and occupy an important position in the commandery office, yet you allow your retainers to repeatedly avoid serving in the army. The people are very resentful and disappointed. Even the higher-level officials know about this. Wang Tong and the others are due to report for military service. Please send them over when it is time." On the day the men were ordered to report for duty, Liu Jie not only refused to send Wang Tong and the others to the camp, but also secretly instructed (or bribed) a commandery-level inspector to go to Jian County and deliberately find fault with Sima Zhi's administration. Sima Zhi's subordinates felt intimidated by the inspector so they agreed to serve in the army in place of Liu Jie's retainers. When Sima Zhi found out, he wrote to Hao Guang (), the Administrator of Jinan Commandery, to explain the situation and expose Liu Jie's wrongdoings. Hao Guang, who respected and trusted Sima Zhi, realised that Liu Jie was in the wrong so he ordered Liu Jie to serve in the army. Liu Jie had no choice but to follow orders. After this incident, there was a saying circulating around Qing Province: "(Sima Zhi) turned a commandery registrar into a soldier." Sima Zhi later became the Prefect () of Guangping County (廣平縣; north of present-day Quzhou County, Hebei). At the time, Liu Xun, one of Cao Cao's generals, behaved arrogantly because he believed that, given his past acquaintance with Cao Cao, no one would dare to do anything to him. When he was in charge of guarding Henei Commandery (), Sima Zhi's home commandery, he allowed his relatives, subordinates and retainers to behave lawlessly and do as they wished. Liu Xun once wrote a letter to Sima Zhi, without signing off, to ask him for favours.