《资治通鉴·唐纪·唐纪十八》
五月，吐蕃侵扰唐朝扶州的临河镇，擒获镇将杜孝升，命令他送信说服松州都督武居寂投降，杜孝升坚决拒绝。
五月，吐蕃寇扶州之临河镇，擒镇将杜孝升，令赍书说松州都督武居寂使降，考升固执不从。
In May, the Tubo harassed the Tang dynasty's Linhe town in Fuzhou, captured the town general Du Xiaosheng, and ordered him to deliver a letter to persuade the governor of Songzhou, Wu Jiji, to surrender. Du Xiaosheng firmly refused.