During the Vietnam War, Đông Hà was the northernmost town in South Vietnam and was the location on a strategically important U.S. Marine Combat Base, outposted to provide surveillance of troops movements across the Vietnamese Demilitarized Zone (DMZ). Dong Ha was overrun on March 31, 1972, during the initial assaults of the North Vietnamese Easter Offensive.
Tourists come to Đông Hà nowadays, especially ex-servicemen from the U.S. and Vietnam, who nearly always include a DMZ tour in their programs. The contemporary Vietnamese singer Nhu Quynh was born in Đông Hà in 1970.
^Keith W. Nolan The Story of an Armored Cavalry Squadron in Vietnam: 1-1 Cav, 1967-1968 ... Just north of Đông Hà on April 6 the correspondent, Brummett, and Nguyễn Ngọc Lương, the paper's interpreter, waited for a possible tank battle"