How did the mongols capture Beijing?

The Mongols captured Beijing, then known as Zhongdu, in 1215 during the reign of Genghis Khan. They besieged the city, employing tactics such as cutting off supply routes and launching coordinated assaults. After several months of siege and facing significant resistance, the city eventually fell, leading to the incorporation of Northern China into the Mongol Empire. This conquest marked a significant expansion of Mongol influence in East Asia.