Quảng Bình Province added phủ Quảng Trạch. Under French colony (French Indochina, Quảng Bình was situated in Annam of French Indochina and Đồng Hới airbase in Quảng Bình was used by the French to attack the Việt Minh in north-central Vietnam and the Laotian Pathet army in north and south Laos. In 1954, the Geneva Accord was signed by France, Vietnam, and other parties involved. According to which, Vietnam was to be temporarily divided into 2 parts, with the 17th parallel as the boundary. North Vietnam was under the control of the Communist party while the South was an anti-communist and French collaborators
1954 Geneva Conference negotiations to that end should resume at an appropriate time. The Belgian and British delegations said that while they were not going to accept "the Soviet and Chinese proposals, that did not mean a rejection of the ideas they contained". In the end, however, the conference participants did not agree on any declaration. While the delegates began to assemble in Geneva from late April, the discussions on Indochina did not begin until May 8, 1954. The Viet Minh had achieved their decisive victory over the French Union forces at Dien Bien Phu the previous day. The Western allies did not