《资治通鉴·唐纪·唐纪四十》
于是李晟率领一千人，西出大震关。到达临洮后，李晟摧毁吐蕃的定秦堡，焚烧吐蕃屯积的军需物资，俘虏守堡将领慕容谷种而归。
乃将千人兼行出大震关；至临洮，屠吐蕃定秦堡，焚其积聚，虏堡帅慕容谷种而还。
So Li Cheng led one thousand troops and marched west out of Dazhen Pass. Having reached Lintao, Li Cheng destroyed the Tubo’s Dingqin Fort, burned the Tubo’s hoarded military supplies, captured the fort’s leader Murong Guzhong and returned.