Final answer:
The Mongol forces struck east toward Beijing during 1211-1215, targeting the state of Xia and pursuing the expansion of their empire under the leadership of Chinggis Khan.
Step-by-step explanation:
During the years 1211-1215, the Mongol forces struck in the direction of East, toward the city of Beijing. This period marked the Mongol incursions into the state of Xia, which was followed by a series of campaigns against the Xia cities, including multiple sieges that culminated in the fall of their capital, Zhongxing Fu, in 1227 after a six-month siege. These early conquests set the stage for subsequent Mongol expansion across Eurasia, under the leadership of Chinggis Khan, known in the West as Genghis Khan.