《资治通鉴·唐纪·唐纪二十六》
由于军容不整的缘故，唐玄宗让兵部尚书郭元振跪在军中的大旗之下，准备将其斩首。
以军容不整，坐兵部尚书郭元振于纛下，将斩之。
Because of the disorderly military appearance, Emperor Xuanzong of Tang asked Guo Yuanzhen, the Minister of the Ministry of War, to kneel under the big flag of the army, ready to behead him.