The Mongol Empire under Genghis Khan conquered vast lands and subjugated nations.

Genghis Khan's last battle was fought in Western Xia but his life had come to an end before he was able to conquer it.

Additionally, the Mongols led the water of Yellow River into the city, causing great casualties among the Song army.

[3] The fall of Luoyang was simply a prologue of a series of upcoming battles which lasted decades.

Under the command of Meng Gong, Yu Jie, and other generals, the Song army fended off the advancing Mongols.

In order to reverse the dire situation in Sichuan, Yu sought the advice of the people under his command.

All the castles that were built were situated on the tops of mountains which made them extremely formidable against any offensive.

This action distressed the Song army since they would not be able to recover these lost territories once the Mongols acquired a permanent source of food and supplies.

After receiving the news of Hulagu reporting the demise of Baghdad and its caliph, Möngke Khan decided to break the standoff by leading a large army into Sichuan himself.

When this strategy was proven ineffective, they started night raids on the outer part of the castle on minor defensive structures.

[5] In the seventh month of the first year of Kaiqing, Möngke was giving up the original plan of capturing the castle and instead, to dispatch his remaining forces to attack Chongqing, however, Diaoyu Fortress would soon prove to be his place of demise, as Möngke died during the siege.

The prime minister of Song Jia Sidao soon sent his ambassador to negotiate a peace treaty.

Hulagu remained in Persia permanently while Kublai and Ariq Böke tried to seize the title of Khan for themselves.