《新唐书·列传·卷一百四十二》
及至交战，突厥兵仓促不能胜，延陀飞马追赶，李责力来救。延陀万箭齐发，马多射死。
及战，突厥兵迮，延陀腾逐，勣救之，延陀纵射，马辄死。
When the battle started, the Tujue soldiers were unprepared and could not prevail. Yanda chased them on horseback and Li Zhili came to their aid. Yanda launched a volley of arrows, killing many horses.