ˋㄐㄧㄚˋㄑㄧㄣㄓㄥyùjià‑qīnzhēng

御驾亲征
  1. 皇帝親自出征領導親自出馬處理事情 御駕親征往往鼓舞士氣效用」。

the emperor leads his troops into battle (idiom)​, to take part personally in an expedition