The Battle of Jangsari, while not as well-known as other battles in Korean history, holds significance as a pivotal moment in the country's struggle against foreign invasion. The battle demonstrated the military prowess of the Mongol Empire and the challenges faced by the Goryeo Dynasty in defending its sovereignty.

In the early 13th century, the Mongol Empire, under the leadership of Genghis Khan and his successors, embarked on a campaign of conquest that would eventually stretch from China to Eastern Europe. One of the key theaters of this expansion was the Korean Peninsula, where the Mongols clashed with the Goryeo Dynasty. A significant, albeit lesser-known, battle in this conflict was the Battle of Jangsari, fought in 1231.

The Battle of Jangsari took place in 1231, during the early stages of the Mongol-Goryeo War. Jangsari, located in what is now North Korea, was an important strategic location that controlled access to the Goryeo capital, Kaesong. The battle was a key engagement between the Mongol forces, led by General Hong Tagu, and the Goryeo army.