Duckju mountain fortress
This mountain fortress was established at southern Chungcheongbook-do Jecheon-city Woraksan Mountain and this was established using rocks during United Silla era. This was made of inner Sung and outer Sung.
In this mountain fortress, army could block the road which was connected to Mungyeong and Chungju. In Goryeo Gojong(King) on the 43rd year(1256), Mongo army invaded Chungju, but gathering clouds and rising wind with hailstones drove back the Mongo army. Also, in the latter period of Chosun, someone guessed Myeongsung Queen could be expelled from Heungsundaewongun so he made the castle gate as a hiding place.
Circumference was 32,670 Cheok(9,800m) and this mountain fortress was collapsed. But the south gate(Weolaklu), the east gate(Duckjuru) and the north gate(Bukjeongmun) still remains.
The south gate was made of Hongyemun which is rainbow shape and located at the way from Dongchang to Munkyeong. Seokbyeok which blocked the left and the right side is 100 gan(length). East gate in the front of the entrance of Duckjugol is similar to south gate and the north gate has Hongye. In Marutdol of Hongye, Taegeuk shape was carved. Duckju Mountain fortress has 5 layered wall and the age of each wall is not similar. This is evaluated as an important data.