In 1847, the seventh year of Thieu Tri’s reign, the edge of Dien Hai was widened to 556m with a wall 5m high encircled by a 3m deep channel. The citadel had two entrances, the main one leading to the south and the rest to the east. Inside, there was Hanh Cung (the royal step-over place), Ky Dai (high flagpole podium), a warehouse for food, an ammunition and 30 big canon emplacements. The citadel was made of brick in the square Vauban style of architecture.

Dien Hai Citadel has contributed an important donation to the defeat of the French invaders in Da Nang in 1858-1860. It represents tradition of the fight of Da Nang people and the nation in the relentless war opposed to the French colonialists to defend national independence and territory. To memorize a magnanimous period of the city’s history, an impressive statue of General Nguyen Tri Phuong was constructed.

Categorizing as a national historical relic by the Ministry of Culture and Information on 16th November 1998, Dien Hai Citadel had a stele erected on 25th August 1998.  {itpsharepoint}