Today I learned about war story in Korea. In the 5th century, Goguryeo was attacked. Sui attacked Goguryeo with one million soldiers, but Goguryeo defeated them. And then Sui invaded Goguryeo with 300,000 more soldiers the second time. In that war, the famous general Euljimundeok had a brilliant strategy to defeat the Sui army. It later became known as the Battle at Salsu River (Salsudaecheop). There was another invasion of Korea during the Goryeo Dynasty by the Mongols.

The strongest Mongol soldiers invaded our country. So Korea couldn't defeat them. Then the king and the royal family ran away to Ganghwa island. But the Korean guerilla army known as Sambyeolcho resisted them even after the king ran away. After the war, Korea had to follow Mongolian culture during King Gongmin's time. Even though they lost, I want to follow their braveness. The last topic was the Imjin War. The famous general or hero Yi Sun-shin had a bright idea or called Hagikjin. The reason why the plan is called Hagikjin is the ships were lined like a crane. I thought that we had very smart generals. I am proud of them.

Great work, you had so much information, but next time you write your essay you need to make sure to write things like was was the Battle of Salsu River, and when Mongolia invaded what dynasty was it, and who was Yi Sun-shin fighting and when, and why...  If you add all of this information your essay will be perfect