Ordos Loop
In 1207, Genghis led another raid into Western Xia, invading the Ordos Loop and sacking Wulahai, the main garrison along the Yellow River, before withdrawing in the spring of 1208. The Tanguts tried to form a united front with the Jurchen Jin dynasty against the Mongols, but the usurper monarch, Wanyan Yongji, refused to cooperate and declared that it was to their advantage that enemies attack one another.