village in NW Vietnam: besieged & captured by Vietminh forces (1954), marking the end of French occupation of Indochina
See Dien Bien Phu in American Heritage Dictionary 4
A town of northwest Vietnam near the Laos border. The French military base here fell to Vietminh troops on May 7, 1954, after a 56-day siege, leading to the end of France's involvement in Indochina.