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In the history of our country, the largest territory is the Mongolian Yuan Dynasty. During the Genghis Khan period, the territory area exceeded180,000 square kilometers. The first western expedition of Mongolia (12 19- 1225) was 12 19. In order to eliminate the remnants of Naiman Department, Genghis Khan. His four sons, Shu Chi, Chahetai, Wokuotai and Tuo Lei, and generals Subutai and Zhe Bie accompanied him. After the Mongols invaded Central Asia, they captured Samarkand, the capital of Hualamozi, in 1220. Its king fled to the west, and Genghis Khan ordered Zhe Bie to pursue him. As a result, the Mongolian army crossed the Caucasus between the Caspian Sea and the Black Sea to the west and went deep into Russia. 1223 defeated the joint forces of chinchak and Russia. In addition, Genghis Khan pursued Prince Zalandin of Varamozi and defeated him in the Indus Valley. 1225, Genghis Khan returned to the east triumphantly, and enfeoffed his native land and newly conquered land in the western regions to his four sons, and later developed into the Four Great Khan countries. In the second Western Expedition (1235- 1244), Genghis Khan died shortly before the demise of Xixia, and the last three sons succeeded to the throne. 1235, Wokuotai sent Badou, the second son of his brother Shu Chi, to lead 500,000 troops to the western expedition again. The Western Expedition Army soon wiped out the flower thorn submodule and killed Zalandin. Soon after, he conquered Russia on a large scale, captured cities such as Moscow and Kiev, divided his forces into several roads, and advanced to the heart of Europe. 124 1 year, the Mongolian army in Beilu defeated the Polish and German allied forces in legnica, southwest Poland. Badou personally led the main force of the Mongolian army to enter Hungary from the middle road and won a great victory. His striker went straight to Venice, Italy, which shocked the whole of Europe and was called the "Yellow Disaster". Just as the western countries were in constant fear, Badou suddenly received the bad news of Wokuotai's death and acted quickly. The Third Western Expedition (1253- 1260) After 125 1 arrived at the Great Khan position, Meng Ge led his brother Xu Liewu to the Western Expedition. The main direction of this western expedition is southwest Asia, and the first goal is to eliminate Murahida (northern Iran on the south bank of the Caspian Sea). 1257, the Mongolian army razed to the ground, marched westward, captured Baghdad, slaughtered 800,000 people, and destroyed the Abbas dynasty, which lasted for more than 500 years. Later, Xu Liewu led his troops to capture the Arab holy places of Mecca and Damascus. His striker once crossed the sea to collect rich waves (that is, the island of Cyprus in the eastern Mediterranean). He was supposed to attack Egypt further. Because of the news that Mongo was killed, he led the main force to dispatch troops. However, it is still controversial whether Mongolian rule has reached the North Sea. If it reaches the North Sea (the Arctic Ocean), it will be far more than 20 million square kilometers, putting Tibet and Taiwan Province Province under the central rule for the first time.