Dong Da Hill is a grassy mound in central Hanoi, just over 2 km (1.2 miles) southwest of Van Mieu (The Temple of Literature). It is an artificial hill covering the thousands of dead Chinese invaders killed by Nguyen Hue, subsequently the Emperor Quang Trung, who defeated a Qing army of 200,000 men in just one week during Ky Dau, the ???ear of the Cock?? or 1789.

In 1788 a large Qing army was sent south to restore L礙 M廕南 ?廕?(L礙 Chi礙u Th廙g) to the Vietnamese throne. They succeeded in taking Th?ng Long (H? N廙??, Hanoi) and putting Emperor L礙 Chi礙u Th廙g back on the throne.

This situation did not last long as the T璽y S??n leader, Nguy廙?? Hu廙? launched an attack against the Qing forces while they were celebrating the Chinese New Year festival of the year 1789. The Chinese were completely defeated and Nguy廙?? Hu廙?was proclaimed Emperor Quang Trung of Vietnam, although he also agreed to pat tribute to the Qing court to avoid further invasions.

Nguy廙?? Hu廙? also known as Emperor Quang Trung (???葉????