《后汉书·列传·西域传》
敦煌太守曹宗担心他们的凶暴祸害，在元初六年，就上书请求派行长史索班率领一千多人驻守伊吾来招降安抚西域，这样，车师前王和鄯善王前来投降。
敦煌太守曹宗患其暴害，元初六年，乃上遣行长史索班，将千余人屯依吾，以招抚之。于是车师前王及鄯善王来降。
Cao Zong, the Grand Administrator of Dunhuang, was concerned about their savage aggression. In the sixth year of the Yuanchu reign period, he submitted a memorial requesting that the Commandant-General, Suo Ban, lead more than one thousand troops to garrison Yiwu to pacify and pacify the Western Regions. As a result, the Western King of the Anterior Cheshi and the King of Shanshan surrendered.