[11][12] A precocious child, Sima Jun could write court submissions and quote the classics fluently when he was four or five years old, surprising those who witnessed such acts.
[18] After the initial failed attempts of the Jin court at quelling Tufa Shujineng's rebellion, Sima Jun focused his soldiers on agriculture in Guanzhong.
In September or October 274, rebels from Liang attacked Jincheng again, but Sima Jun defeated them and killed one of their leaders, Qiwenni (乞文泥).
[20] Later that year, when Sima Jun was ordered to lead 7,000 soldiers to strengthen the garrison in Liang, Shujineng, Houdanbo (侯彈勃) and their followers planned to raid the military-agricultural colonies in Guanzhong in his absence.
[27] After news of his death reached the western regions of the Jin empire, mourners filled the streets, and the locals erected steles for Sima Jun.