In 439, Emperor Taiwu of Northern Wei launched a major campaign against Northern Liang and captured both his capital Guzang (姑臧, in modern Wuwei, Gansu) and Juqu Mujian himself.
During the year 439, Emperor Taiwu of Northern Wei launched an extensive military operation against Northern Liang, capturing their capital Guzang (present-day Wuwei, Gansu) and Juqu Mujian in the process.