The Mongol army during the Mongol Empire was really powerful. Everywhere you go, it is like the autumn wind sweeping away the fallen leaves. At that time, no country or nation in the world could withstand the fierce pursuit and fierce attack of the Mongol army. At that time, the most powerful was the Southern Song Dynasty, although the Mongols fought the Southern Song Dynasty and launched three large-scale battles, but the good villains took down the Southern Song Dynasty. The countries of West Asia and the countries of Europe, on the other hand, have basically no victory against the Mongols.
After Genghis Khan established the Great Mongol State, he took the lead in launching a war against the Jin State that had once enslaved him. In order to concentrate his forces on the Jin Dynasty, Genghis Khan sent envoys to the west to express his desire for peaceful coexistence and to conclude a trade agreement. However, Hua Thorny Moum, who claimed to be the hegemon of Central Asia, not only rejected Genghis Khan's request for peaceful coexistence, but also slaughtered all the Mongol emissaries and caravans.
The Mongol front was too long, only in Eastern Europe, because of the devastating economic plunder, which led to a series of Slavic uprisings, and even the rebellion of the Kumans and Bulgarians. This seriously threatened the security of the Mongol rear, and it was very important to proceed to the next military operation. Compared with the wooden fortresses widely spread in Eastern Europe, Central and Western Europe are more stone fortresses, which are much stronger than the fortresses in Eastern Europe, and the difficulty of conquest is also much increased.
The Mongol army's three western expeditions were eventually over due to the death of the Mongol Khan and would withdraw. According to Mongolian custom, the new Great Khan must be elected and appointed by the "Kuritai Council", which is equivalent to the Council of Nobles and is composed of Mongolian nobles. The elder Khan died, and the nobles wanted to come back to attend the "Kuritai Conference", so they stopped the western expedition and returned to the meeting with their own men and horses.