Battle of Dai Do
1968 CE.
Shown on the map at 16.841°, 107.111°.
The Battle of Dai Do (also known as the Battle of Đông Hà) took place from 30 April to 3 May 1968 in Quảng Trị Province during the Vietnam War.
Text from the Wikipedia article Battle of Dai Do, licensed CC BY-SA 4.0.