In 215, Xu Huang was tasked with defending Hanzhong's communication line, Mamingge (馬鳴閣), under the command of Xiahou Yuan to halt the advances of Liu Bei's army.
Xu Huang was tasked with defending Hanzhong's communication line. This was in 215. This was under the command of Xiahou Yuan. This was to halt the advances of Liu Bei's army. Hanzhong's communication line was Mamingge (馬鳴閣).