《智囊(选录)·兵智部·战车》
前朝大臣余子俊说： 大同宣抚等地，地势平坦开阔，非常适宜用战车作战。
先臣余子俊言： 大同宣抚地方，地多旷衍，车战为宜。
Yu Zijun, a minister of the previous dynasty, said: Datong Xuanfu and other places have a flat and open terrain, which is very suitable for chariot warfare.