 The Inscription of Yanran, composed by Ban Gu and engraved on Mount Yanran to commemorate Dou Xian's victory again the Xiongnu, was recorded in the 5th-century "Book of Later Han".The expression "to carve a stone on Yanran" () entered the Chinese language as a synonym for achieving a decisive victory.In 2016, a researchers team of Mongolian national university expedition rediscovered the inscription in the Inil (Delgerkhangai) Mountains in southern Mongolia".