Bukmun (Northgate) was used to launch attacks from the fortress during the Manchu siege. According to the record, 300 soldiers went through the gate to attack the Manchus but fell into a trap and were annihilated in the greatest fight and loss of troops during the siege. During the rebuilding of 1779, the gate was renamed Jeonseungmun or "Battle Victory Gate" with the meaning to never forget the loss. The gate is thought to have been built in 1624.