This ancient fortress, which contains fortifications that date back to 672, was built on the western edge of Namhan mountain to protect Korean dynasties fromTang China.
Most of the structure that exists today was planned, beginning in 1624, when the Manchus were threatening Ming China. In 1636, the Manchus invaded and the king fled with his court and 13,800 soldiers to Namhan San-seong. Here they were well defended and the king enjoyed the protection of a bodyguard composed of 3000 fighting monks.
The Manchus were not able to take the fortress by storm, but after 45 days of siege the food supply inside ran out, and the king was forced to surrender, giving his sons as hostages and shifting allegiance from the Ming.
**Check out Wikipedia @ http://en.wikipedia.org/wiki/Namhansanseong**