Page "Karasahr" Paragraph 7

According to Hou Hanshu, General Ban Chao went on a punitive campaign against Yanqi in 94 AD after they attacked and killed the Protector General Chen Mu and Vice Commandant Guo Xun in 75 AD.

The king of Yanqi was decapitated and his head displayed in the capital.

Later rebellions were subdued by Ban Chao's son Ban Yong in 127.