《旧唐书·列传·卷六十一》
等到与贼军对垒，房琯想占据重要位置用来观察局势，让中使邢延恩等人督战，大旗纷纷倒下，于是就失败了。
及与贼对垒，琯欲持重以伺之，为中使邢延恩等督战，苍黄失据，遂及于败。
When he confronted the rebel army, Fang Guan wanted to seize a strategic location to observe the situation, and had the Imperial Emissaries Xing Yanyin and the others supervise the battle. The banners fell one after another, and they were defeated.