The first time was in the era of Genghis Khan, when Genghis Khan perished, and the Western Liao defeated Xixia and Jin, and the momentum was in full swing. The diplomatic mission was murdered because Mongolia sent the Khorezmo to its west to seek trade, so Genghis Khan sent troops for revenge. As a result, the Khorezmo collapsed at the touch of a button, and Genghis Khan sent rangers led by Zhe Bie and Subutai across the Middle East, all the way to the Caucasus Mountains (the dividing line between Europe and Asia).
The second time was in the Wokuotai era, when Wokuotai concentrated the eldest sons of various governors to form an expeditionary force, led by the oldest Badou (the second son and heir of Shu Chi), who could not actually command. Cross the Caucasus, cross southern Russia, all the way into Hungary, and defeat the European Coalition forces. Later, he retired because of Wokuotai's illness. In the Western Expedition, Eight Doors clashed with Gui You, the son of Wokuotai, so that Gui You almost sent troops to crusade against Eight Doors after he ascended the throne, but a crisis was avoided because of his early death. Later, with the support of Ba Dou, Tuo Lei's son Mongo ascended the throne as Mongolian Khan after Gui You.
The third time was in the era of Mongo, and Xu Liewu was ordered by Mongo Khan to explore the Middle East. After he occupied Iran, he entered Iraq, surrounded Baghdad, destroyed Baghdad and destroyed the Arab Empire under the circumstances that the caliph of Abbasid dynasty refused to surrender. After that, it continued westward to Syria and Palestine, but it was countered by the Mamluk dynasty and made no progress. Later, Meng Ge died in Hechuan Fishing City, and Xu Liewu returned to Li. On the way, he heard that the Alibaba brothers and Kublai Khan were fighting for the position of Khan, and they were stationed in Tabrizi. Later, Kublai Khan named him Khan and established the Ili (Il) khanate.