《资治通鉴·汉纪·汉纪四十三》
于是，朝廷派敦煌太守张朗率河西四郡之兵三千人，配合班勇。班勇便征发西域各国之兵，共四万余人，分两路进击焉耆。
于是遣敦煌太守张朗将河西四郡兵三千人配勇，因发诸国兵四万馀人分为两道击之。
So the court sent Zhang Lang, the Governor of Dunhuang, with 3,000 troops from the four counties of Hexi, to cooperate with Ban Yong. Ban Yong then mobilized troops from various countries in the Western Regions, totaling more than 40,000, and divided them into two groups to advance against Yanqi.