Viet Minh Defeat French at Dien Bien Phu

The Battle of Dien Bien Phu (French: Bataille de Diên Biên Phu; Vietnamese: Chiến dịch Điện Biên Phủ) was the climactic confrontation of the First Indochina War between the French Union's French Far East Expeditionary Corps and Viet Minh communist revolutionaries. The battle occurred between March and May 1954 and culminated in a comprehensive French defeat that effectively ended the war. Military historian Martin Windrow wrote that Dien Bien Phu was "the first time that a non-European colonial independence movement had evolved through all the stages from guerrilla bands to a conventionally organized and equipped army able to defeat a modern Western occupier in pitched battle."

Negotiations leading to the 1954 Geneva accords began on May 8, the day after the surrender of the garrison. Ho Chi Minh entered the conference on the opening day with the news of his troops' victory in the headlines. The resulting agreement temporarily partitioned Vietnam into two zones: the North was administered by the communist Democratic Republic of Vietnam while the South was administered by the French-supported State of Vietnam. The last units of the French Union forces withdrew from Indo-China in 1956. This partition was supposed to be temporary, and the two zones were supposed to be reunited by national elections in 1956. After the French withdrawal, the United States supported the southern government, under Emperor Bao Dai and Prime Minister Ngo Dinh Diem, which opposed the Geneva agreement, and which claimed that Ho Chi Minh's forces from the North had been killing Northern patriots and terrorizing people both in the North and the South. The North was supported by both communist China and the Soviet Union. This dispute would eventually escalate into the Vietnam War (Second Indochina War).

France's defeat in Indochina seriously damaged its prestige elsewhere in their colonial empire, notably the North African territories from which many of the troops who fought at Dien Bien Phu had been recruited. In 1954, six months after the battle at Dien Bien Phu ended, the Algerian War started, and by 1956 both Moroccan and Tunisian protectorates had gained independence. A French board of inquiry, the Catroux Commission, later investigated the defeat.