《旧唐书·列传·卷十七》
过了一年多，宇文化及在江都反叛杀君，聚集军队北上，直指东郡。
经岁余，宇文化及于江都弑逆，拥兵北上，直指东郡。
More than a year later, Yu Huaji rebelled and killed the emperor in Jiangdu. He gathered an army and headed north, pointing directly at Dongjun.