《元史·本纪·卷一》
之后又和皇弟哈撒儿再次讨伐乃蛮，双方在忽阑盏侧山相持、交战，乃蛮被打得大败，他的部将和士兵全部被杀了，堆积的尸体成了一座高丘。乃蛮部的势力就此衰弱下去。
已而与皇弟哈撒儿再伐乃蛮，拒斗于忽兰盏侧山，大败之，尽杀其诸将族众，积尸以为京观，乃蛮之势遂弱。
Later, they led another expedition with Genghis Khan's younger brother, Hasar, to attack the Naimans again. The two sides fought on the slopes of Hulan Town. The Naimans were badly defeated, all their generals and soldiers were killed, and the piled-up corpses rose into a hill. The Naiman power weakened from then on.