《资治通鉴·唐纪·唐纪五十七》
己未，天尚未明，穆宗从复道出城，到华清宫去游玩，只有公主、驸马、神策军护军中尉、神策军以及羽林、龙武、神威六军军使率禁军一千多人随从护卫，到黄昏时才回宫。
己未，未明，上自复道出城，幸华清宫，独公主、驸马、中尉、神策六军使帅禁兵千馀人扈从，晡时还宫。
On jiwei day, before dawn, Emperor Muzong secretly left the city through the pedestrian bridge and went to Huaqing Palace for leisure. He was accompanied by only a few officials from the various bodyguard and militia units and over 1,000 forbidden troops from the imperial guard. He returned to the palace at dusk.