《史记·七十列传·匈奴列传》
这时，汉朝在马邑城附近埋伏下三十余万大军，御史大夫韩安国担任护军将军，护卫着四位将军准备伏击单于。
汉伏兵三十馀万马邑旁，御史大夫韩安国为护军，护四将军以伏单于。
At this time, the Han Dynasty had ambushed more than 300,000 troops near Mayi City. Grand Historian Han Anguo served as the General who protected the Army, escorting the four generals to prepare for an ambush on the Chanyu.