《新唐书·列传·卷一百四十一》
吐蕃使者论矩立藏来朝，还未出境，吐蕃入寇宥州，与灵州兵在定远城交战，吐蕃败，被斩杀二千人。
吐蕃使论矩立藏来朝，未出境，吐蕃寇宥州，与灵州兵战定远城，虏不胜，斩首二千级。
Tufan's envoy Lun Jizang came to the imperial court from Tubo to pay tribute. Before Jizang left the country, Tubo invaded Youzhou, fought with Bingzhou soldiers at Dingyuan City, and defeated Tubo with 2,000 people killed.