Abstract: In 1259, due to the death of Mongke Khan in battle, struggles for the throne began in Mongolia. In 1260, Kublai Khan tried to make peace with the Song Dynasty by sending Hao Jing as his envoy to the Song Dynasty. Although the two sides failed to reach a formal agreement, the war between the Song and Mongolia became less intense. Before Kublai Khan ordered an official attack on the Song,the two sides entered a moderation period for 7 years. During the period,the Song imperial court appointed Xia Gui as the new Sichuan commander. During his term of office, Xia attacked the Huxiao Castle, led his troops to attack Chengdu twice and recaptured Guang'an County and the Daliang Castle. His military moves had a significant impact on the war situation. On the one hand, the victories saved the Song army out of the passive situation in the eastern Sichuan theater and frustrated Mongolian strategical intention of "annihilating Sichuan by occupying Kuizhou". On the other hand, the strong resistance led by Xia Gui to a certain degree drove the major Mongolian army from Sichuan to Jingzhou-Xiangyang area.

Key words: Song Dynasty, Mongolia, the war between the Song Dynasty and Mongolia, Xia Gui, Anti-Mongolian war, Sichuan theater