《左传·僖公·僖公三十三年》
三十三年春季，秦国军队经过成周王城的北门，战车上除御者以外，车左、车右都脱去头盔下车致敬，随即跳上车去的有三百辆战车的将士。
三十三年春，秦师过周北门，左右免胄而下。超乘者三百乘。
In the spring of the thirty-third year, when the Qin army passed through the north gate of the Royal City of Cheng Zhou, with the exception of the charioteer, all the left and right riders got out of their cars and saluted without their helmets, and then three hundred warriors jumped into the cars.