New Book of Tang: The Tibetans were defeated at Qilian Castle (in the seventh month Damomen Castle fell).; Zizhi Tongjian: In July 728 (Yisi day)…
The Tibetans were defeated at Qilian Castle (in the seventh month Damomen Castle fell).
及吐蕃戰于祁連城，敗之
Location: 新唐書 卷005 睿宗·玄宗 開元16年8月
In July 728 (Yisi day), Xiao Song, jiedushi of Hexi, and Zhang Chongliang, jiedushi of Longyou, crush Tubo in the Kebo valley; Chongliang pursues, takes the walled town of Damomen, burns the Luotuo bridge and returns.
乙巳，河西節度使蕭嵩、隴右節度使張忠亮大破吐蕃於渴波谷；忠亮追之，拔其大莫門城，擒獲甚眾，焚其駱駝橋而還。
Location: 권213 728년 항
A and B are two of the sources listed above.
| On what point | Source A | Source B | What differs (in Korean) |
|---|---|---|---|
| Place | New Book of Tang (Xin Tangshu), Annals | Zizhi Tongjian (Comprehensive Mirror) | a는 기련성, b는 갈파곡 |