Battle of Dien Bien Phu 1954: France's Defeat in Indochina

The Battle of Dien Bien Phu was a siege fought from 13 March to 7 May 1954 in a remote valley of northwestern Vietnam, between the French Union army and the Viet Minh forces of General Vo Nguyen Giap. The fall of the French base was the decisive defeat of the First Indochina War. It led directly to the Geneva Accords, which ended French rule in Indochina and divided Vietnam.

Background

France had colonised Vietnam in the nineteenth century (see French Conquest of Vietnam). After the Japanese surrender in 1945, Ho Chi Minh’s Viet Minh declared Vietnamese independence, and war with returning French forces broke out in December 1946. By 1953 the Viet Minh, supplied by communist China, controlled much of the north, and the war was increasingly unpopular in France.

The new French commander, General Henri Navarre, wanted to block Viet Minh moves into Laos and lure Giap’s divisions into a set-piece battle where French artillery and air power could destroy them. He chose Dien Bien Phu, a valley near the Laotian border with an old Japanese airstrip, about 300 kilometres from Hanoi.

Building the base

On 20 November 1953, in Operation Castor, French paratroopers dropped into the valley and seized it. Over the following weeks the base grew into a fortified camp of strongpoints, traditionally said to be named after women, such as Béatrice, Gabrielle, Anne-Marie, Huguette, Dominique, Éliane, Claudine and, further south, Isabelle. Colonel Christian de Castries took command.

The garrison, about 10,800 men at the start of the siege and some 16,000 by its end including reinforcements, included French, Foreign Legion, North African, African and Vietnamese troops. It depended entirely on supply by air.

French planners assumed the Viet Minh could not bring heavy guns through the jungle hills or keep a large army supplied. Instead, Giap concentrated around 50,000 combat troops, with tens of thousands of porters moving food and ammunition on foot, by bicycle and by truck. Artillery, including 105mm howitzers, was dragged into dug-in positions on the slopes overlooking the valley.

The siege

The assault began on 13 March 1954. Béatrice fell that night and Gabrielle on 15 March, and the Thai troops holding Anne-Marie largely withdrew or deserted. The French artillery commander, Colonel Charles Piroth, who had promised to silence the enemy guns, took his own life on 15 March.

Viet Minh shelling soon made the airstrip unusable, and after late March the garrison could be supplied and reinforced only by parachute, much of which fell into enemy hands. Giap then switched to siege tactics, digging trenches ever closer to the French positions. Fierce battles were fought for the hills known as the Éliane and Dominique strongpoints through April, with heavy losses on both sides.

Monsoon rains flooded trenches and dugouts, and hundreds of wounded men lay in overcrowded underground hospitals. Volunteers who had never jumped before parachuted in to reinforce the garrison. In practice much of the defence was directed by a group of paratroop officers around Lieutenant Colonel Pierre Langlais and Major Marcel Bigeard, while de Castries remained in his command bunker.

Geneviève de Galard, a French air force nurse stranded when her evacuation aircraft was destroyed on the airstrip, stayed to care for the wounded throughout the siege. The press called her the “angel of Dien Bien Phu”, and she became one of the best-known figures of the battle.

The Viet Minh also suffered terribly. Human-wave assaults in March and April cost Giap thousands of his best troops, and morale in some units fell sharply before reinforcements, political campaigns and fresh supplies of ammunition allowed the final offensive.

The fall

Giap launched his final offensive on 1 May. On the afternoon of 7 May 1954 Viet Minh troops overran de Castries’ command post, and resistance in the central camp ended. The isolated southern strongpoint, Isabelle, fell during the night of 7–8 May.

About 11,000 French Union soldiers were taken prisoner. Forced to march hundreds of kilometres to prison camps and weakened by disease and hunger, many did not survive; only about 3,300 were returned later that year.

Outside powers

The battle was not only a French–Vietnamese affair. By 1954 the United States was paying a large share, often estimated at around three-quarters, of the cost of France’s war, and supplied aircraft, transport planes and equipment, some flown by American civilian contract pilots. As the garrison weakened, Washington discussed Operation Vulture, a plan for heavy bomber strikes around the valley, and even the possible use of nuclear weapons. President Dwight D. Eisenhower declined to act without British support and congressional approval, and neither was forthcoming.

On the other side, communist China supplied the Viet Minh with artillery, anti-aircraft guns, trucks and ammunition, and Chinese military advisers helped plan the campaign. Much of the artillery had been captured from the Nationalists during the Chinese Civil War or from American forces in Korea. After the Korean Armistice of July 1953, Beijing was able to increase its aid to Vietnam.

Myths and facts

• Myth: The Viet Minh carried their artillery to the hills entirely by hand. Fact: Porters and soldiers did haul guns over the final stretches, but trucks, many supplied by China, carried a large part of the supplies along improved roads.
• Myth: The strongpoints were named after de Castries’ mistresses. Fact: This popular story cannot be confirmed; the names may simply have followed an alphabetical or arbitrary scheme.
• Myth: The garrison was entirely French. Fact: Most of its soldiers came from the Foreign Legion, North and West Africa and Vietnam, alongside metropolitan French troops.

Consequences

The Geneva Conference on Korea and Indochina began its Indochina sessions on 8 May, the day after the fall. In France the defeat brought Pierre Mendès France to power in June, promising peace. The Geneva Accords of 20–21 July 1954 provided for a ceasefire, French withdrawal, the independence of Laos and Cambodia, and a temporary division of Vietnam at the 17th parallel pending elections in 1956 that were never held.

The partition set the stage for the Vietnam War, in which the United States replaced France as the main foreign power in the south. The defeat also shook the French army, many of whose officers went on to fight in the Algerian War of Independence, which had begun that November.

Key people

• Vo Nguyen Giap (1911–2013), Viet Minh commander who planned the siege.
• Christian de Castries (1902–1991), French commander of the garrison, promoted to brigadier general during the siege.
• Henri Navarre (1898–1983), French commander-in-chief in Indochina, who chose Dien Bien Phu.
• Ho Chi Minh (1890–1969), leader of the Viet Minh and the Democratic Republic of Vietnam.

Timeline

• 1953, 20 November: French paratroopers seize the valley in Operation Castor.
• 1954, 13 March: The Viet Minh attack; Béatrice falls overnight.
• 1954, 15 March: Gabrielle falls; artillery commander Piroth dies.
• 1954, late March: Shelling closes the airstrip.
• 1954, 1 May: Giap launches the final offensive.
• 1954, 7 May: The French command post is overrun.
• 1954, 8 May: The Geneva Conference begins discussing Indochina.
• 1954, 21 July: The Geneva Accords end the First Indochina War.

Why it matters

Dien Bien Phu was one of the first times a colonial army was defeated by an anti-colonial force in a conventional battle. It ended French power in Southeast Asia, inspired independence movements elsewhere and set Vietnam on the path to a longer war involving the United States.