《旧唐书·列传·卷一百一十二》
郓州兵靠右棣州兵靠左希望便于区别。 分定之后，又命棣州兵出外。
郓州士卒处右，州兵处左，冀易以区别。 分定，并令州兵出外。
“The Yuzhou soldiers are on the right and the Bingzhou soldiers are on the left, so as to make it easier to distinguish.” After the division, the Bingzhou soldiers were ordered to go out.