is one of two crossbow platforms in the fortress and is situated within reach of the east gate and has a wide field of view as it sits on a corner of the wall, enabling archers to target assailants from many angles. North-East Observation Tower (동북공심돈) Dongbuk Gongsimdon, meaning the north-east observation tower, is situated beside Changnyongmun. Oval in shape, its three stories stand tall. The roof is accessible by an internal spiral staircase East Command Post (동장대) Dongjangdae, meaning eastern command post, stands next to Dongbuk Gongsimdon, facing Changnyongmun across an archery field. When the king was in residence in Haenggung, within the fortress walls, there were two generals and four soldiers on guard in this command post at all times. (There were five night shifts.) Each officer was armed with a bow and arrow, sword and baton. The command post is nicknamed Yeonmudae, a reference to its second function as a training camp. East Secret Gate (동암문) Dongammun, the eastern secret gate, situated from Dongjangdae, was used for passage of people, animals and munitions. Construction of the gate, which sits beneath a brick structure surmounted with a large round parapet, was completed on March 25, 1796. East-North Sentry Post (동북포루) The Dongbuk-SentryPost stands between the north and east secret gates, and protects their outskirts. This structure shall not be confused with the Bukdong-GunTower. North Secret Gate (북암문) Bukammun, or officially the third north gate (제3북암문) is the only remaining secret gate of the three originals. It lies close to the north-east pavilion. North-East Pavilion (동북각루) The north-east pavilion is known as Dongbuk Gangnu and nicknamed Banghwasuryujeong. It sits above Yongyeon, a pond surrounded by a small garden. It was originally intended to be the second battle command post, though its scenic location made it a place favoured instead for feasts. Hwahongmun (화홍문) Hwahongmun, otherwise known as Buksumun, is the gate under which the Suwoncheon flows on entering the area encompassed by Hwaseong and exited through Namsumun. The gate has the obvious function of being a bridge, but also housed cannons for defensive purposes. The Suwoncheon was widened at this point and the gate has seven arches through which it passes. North-East GunTower (북동포루) Bukdong-GunTower sits between Janganmun and Hwahongmun. This tower controls the North-East outskirts of the Fortress, and protects Hwahongmun. It was completed on September 23, 1794. Not to be confused with 동북포루, the East-North SentryPost. North-East