In 1283, Mongol troops of the Yuan dynasty under General Sogetu (Sagatou, So Tou, So To, or Sodu) invaded Champa and occupied Vijaya after capturing the citadel of Mou-cheng. However, Indravarman V fled into the mountains. Despite dispersion the Champa troops on a number of occasions, the Mongols were not "progressing one step into a country where they suffered from the heat, illness, and a lack of supplies." Trần Thánh Tông and then Trần Nhân Tông, just like Indravarman V, "obstinately refused" to present themselves to the Mongol Court or make any "act of vassalage", and refused the Mongols passage through Việt Nam.