Gapgotdon is an important fortress that guarded the Ganghwa Strait during the war with Mongolia when Goryeo moved its capital to Ganghwado Island from 1232 to 1270. It is a battery with 8 cannons, and Dondae is a small-scale fortress built with cannons placed. It is a protected place. It is believed that the name Gapgot came from the fact that Ganghwa was called Gabbigocha (甲比古次) during the Three Kingdoms period. During the Goryeo Dynasty, the Mongol army attempted to cross this area, but was unable to achieve its goal and said, 'Even if our soldiers just take off their armor and fill the sea,' There is also a legend that it originated from the expression, “I wish I could cross over.” Gapgotdondae is a dondae belonging to Jemuljin (Gapgotjin) established in the 22nd year of King Injo's reign (1644) in Joseon after the capital was moved to Ganghwa Island from the 19th year of King Gojong's reign (1232) in Goryeo to the 11th year of King Wonjong's reign (1270). was built in In September 1866, the third year of King Gojong's reign, the French Far East fleet landed here with about 600 troops and occupied Ganghwaseong Fortress and Munsusanseong Fortress. However, in October, the French army was defeated by General Yang Heon-su's troops at Jeongjoksanseong Fortress and fled. In 1977, repairs and restoration were carried out on the old site to revive its old appearance. The cannon currently on display inside the dondae is from the Joseon Dynasty and was used to shell Japanese enemy ships invading through the sea.

* Area - 3,475㎡