《三国志·魏书·任苏杜郑仓传》
于是在冬天演习战事，讲解武事，又开办学宫，亲自讲授儒家经典，郡中渐渐受到教化。
於是冬月修戎讲武，又开学宫，亲自执经教授，郡中化之。
So, in the winter, he practiced warfare, explained military affairs, and also opened an academy, where he personally taught Confucian classics, and the people in the county gradually received education.