A poru is a wooden structure positioned on a bastion, a protruding section of a fortress wall. Dongbukporu, one of the five sentry posts at Hwaseong Fortress, was built on May 15, 1796 (the 20th year of King Jeongjo’s reign) as a vantage point from which to spot and fire upon the approaching enemy. Located in a higher position than other nearby spots, this sentry post commands a clear view of Dongammun (Eastern Secret Gate), Dongjangdae (Eastern Command Post), Bukammun (Northern Secret Gate), and Suwon Banghwasuryujeong(Northeastern Pavilion).