《史记·七十列传·匈奴列传》
匈奴听到这消息，就把他们的许多贵重的东西转运到远远的余吾水以北，而单于率领十万骑兵在余吾水以南等侯汉军，同贰师将军交战。
匈奴闻，悉远其累重於余吾水北，而单于以十万骑待水南，与贰师将军接战。
When the Huns heard the news, they moved their many valuables to far north of the Yuwei River, while the Chanyu led 100,000 cavalry south of the Yuwei River to wait for the Han army to fight with Grand General Hexi.