1954 battle of the First Indochina War
The Battle of Điện Biên Phủ was a climactic confrontation of the First Indochina War that took place between 13 March and 7 May 1954. It was fought between the forces of the French Union and Viet Minh.
The French began an operation to insert, and support, their soldiers at Điện Biên Phủ, deep in the autonomous Tai Federation in northwest Tonkin. The operation's purpose was to cut off enemy supply lines into the neighboring Kingdom of Laos (a French ally) and draw the Viet Minh into a major confrontation in order to cripple them. The French based their forces in an isolated but well-fortified camp that would be resupplied by air, a strategy adopted based on the belief that the Viet Minh had no anti-aircraft capability.
The Viet Minh, however, under General Võ Nguyên Giáp, surrounded and besieged the French. They brought in vast amounts of heavy artillery (including anti-aircraft guns) and managed to move these bulky weapons through difficult terrain up the rear slopes of the mountains. They dug tunnels and arranged the guns to target the French positions. The tunnels featured a front terrace, onto which the Viet Minh would pull their cannons from out of the tunnels, fire a few shots, to then pull them back into protective cover. In 54 days of gun battle, no Viet Minh cannon was destroyed.
In March, the Viet Minh began a massive artillery bombardment of the French defenses. The strategic positioning of their artillery made it nearly impervious to French counter-battery fire. Tenacious fighting on the ground ensued, reminiscent of the trench warfare of World War I. At times, the French repulsed Viet Minh assaults on their positions while supplies and reinforcements were delivered by air. As key positions were overrun, the perimeter contracted, and the air resupply on which the French had placed their hopes became impossible as aircraft were shot down and runways were destroyed.
The garrison was overrun in May after a two-month siege, and most of the French forces surrendered. A few men escaped to Laos. Among the 11,721 French troops captured, 858 of the most seriously wounded were evacuated via the Red Cross mediation in May 1954. Only 3,290 were returned four months later. The French government in Paris resigned. The new prime minister, the left-of-centre Pierre Mendès France, supported French withdrawal from Indochina.
The Battle of Điện Biên Phủ was decisive. The war ended shortly afterward and the 1954 Geneva Accords were signed. France agreed to withdraw its forces from all its colonies in French Indochina, while stipulating that Vietnam would be temporarily divided at the 17th parallel, with control of the north given to the Viet Minh as the Democratic Republic of Vietnam under Ho Chi Minh. With huge support by the U.S., the south became the State of Vietnam, nominally under Emperor Bảo Đại, preventing Ho Chi Minh from gaining control of the entire country.
Background.
Military situation.
By 1953, the First Indochina War was not going well for France. A succession of commanders – Philippe Leclerc de Hauteclocque, Jean Étienne Valluy, Roger Blaizot, Marcel Carpentier, Jean de Lattre de Tassigny, and Raoul Salan – had proven incapable of suppressing the insurrection of the Viet Minh, who were fighting for independence. During their 1952–1953 campaign, the Viet Minh had overrun vast swathes of Laos, Vietnam's western neighbor, advancing as far as Luang Prabang and the Plain of Jars. The French were unable to slow the advance of the Viet Minh, who fell back only after outrunning their always-tenuous supply lines. In 1953, the French had begun to strengthen their defenses in the Hanoi delta region to prepare for a series of offensives against Viet Minh staging areas in northwest Vietnam. They set up fortified towns and outposts in the area, including Lai Châu near the Chinese border to the north, Nà Sản to the west of Hanoi, and the Plain of Jars in northern Laos.
In May 1953, French Premier René Mayer named Henri Navarre as Salan's successor to command French Union forces in Indochina. Mayer had given Navarre a single order—to create military conditions that would lead to an "honorable political solution". According to military scholar Phillip Davidson:
 On arrival, Navarre was shocked by what he found. There had been no long-range plan since de Lattre's departure. Everything was conducted on a day-to-day, reactive basis. Combat operations were undertaken only in response to enemy moves or threats. There was no comprehensive plan to develop the organization and build up the equipment of the Expeditionary force. Finally, Navarre, the intellectual, the cold and professional soldier, was shocked by the "school's out" attitude of Salan and his senior commanders and staff officers. They were going home, not as victors or heroes, but then, not as clear losers either. To them the important thing was that they were getting out of Indochina with their reputations frayed, but intact. They spared little thought or concern for the problems of their successors.
Nà Sản and the hedgehog concept.
Navarre began searching for a way to address the Viet Minh threat to Laos. Colonel Louis Berteil, commander of Mobile Group 7 and Navarre's main strategist, formulated the "hérisson" ('hedgehog') concept. The French army would establish a fortified airhead by airlifting soldiers to positions adjacent to key Viet Minh supply lines to Laos. They would cut off Viet Minh soldiers fighting in Laos and force them to withdraw. "It was an attempt to interdict the enemy's rear area, to stop the flow of supplies and reinforcements, to establish a redoubt in the enemy's rear and disrupt his lines".
The "hérisson" was based on French experiences at the Battle of Nà Sản. In late November and early December 1952, Giáp had attacked the French outpost at Nà Sản, which was essentially an "air-land base", a fortified camp supplied only by air. There, the French beat back Giáp's forces repeatedly, inflicting very heavy losses on them. The French hoped that by repeating the strategy on a much larger scale, they would be able to lure Giáp into committing the bulk of his forces to a massed assault. This would enable superior French artillery, armor, and air support to decimate the exposed Viet Minh forces. The success at Nà Sản convinced Navarre of the viability of the fortified airhead concept.
However, French staff officers failed to treat seriously several crucial differences between Điện Biên Phủ and Nà Sản:
First, at Nà Sản, the French commanded most of the high ground with overwhelming artillery support. At Điện Biên Phủ, however, the Viet Minh controlled much of the high ground around the valley, their artillery far exceeded French expectations, and they outnumbered the French troops four to one. Giáp compared Điện Biên Phủ to a "rice bowl", where his troops occupied the edge and the French the bottom. Second, Giáp made a mistake at Nà Sản by committing his forces to reckless frontal attacks before being fully prepared. He learned his lesson: at Điện Biên Phủ, Giáp spent months meticulously stockpiling ammunition and emplacing heavy artillery and anti-aircraft guns before making his move. He obtained crucial intelligence on French artillery positions from Viet Minh spies posing as camp laborers. Artillery pieces were sited within well-constructed and camouflaged casemates. As a result, when the battle finally began, the Viet Minh knew exactly where the French artillery pieces were, while the French did not even know how many guns Giáp possessed. Third, the aerial resupply lines at Nà Sản were never severed, despite Viet Minh anti-aircraft fire. At Điện Biên Phủ, Giáp made it a priority for his gunners to focus on the French runways and aircraft, crippling supply runs and making it impossible for fresh soldiers to be sent in.
Prelude.
Lead up to Castor.
In June 1953, Major General René Cogny, the French commander in the Tonkin Delta, proposed Điện Biên Phủ, which had an old airstrip built by the Japanese during World War II, as a "mooring point". In another misunderstanding, Cogny envisioned a lightly defended point from which to launch raids; Navarre, however, believed that he intended to build a heavily fortified base capable of withstanding a siege. Navarre selected Điện Biên Phủ for Berteil's "hedgehog" operation. When presented with the plan, every major subordinate officer – Colonel Jean-Louis Nicot (commander of the French Air transport fleet), Cogny, and Generals Jean Gilles and Jean Dechaux (the ground and air commanders for "Operation Castor", the initial airborne assault on Điện Biên Phủ) – protested. Cogny pointed out, presciently, that "we are running the risk of a new Nà Sản under worse conditions". Navarre rejected the criticisms of his proposal and concluded a 17 November conference by declaring that the operation would begin three days later, on 20 November 1953.
Navarre decided to go ahead with the plan despite serious operational difficulties. These later became painfully obvious, but at the time may have been less apparent. He had been repeatedly assured by his intelligence officers that the operation carried very little risk of involvement by a strong enemy force. Navarre had previously considered three other approaches to defending Laos: mobile warfare, which was impossible given the terrain in Vietnam; a static defense line stretching to Laos, which was not feasible given the number of troops at Navarre's disposal; or placing troops in the Laotian provincial capitals and supplying them by air, which was unworkable due to the distance from Hanoi to Luang Prabang and Vientiane. Navarre believed that this left only the hedgehog option, which he characterized as "a mediocre solution". The French National Defense Committee ultimately agreed that Navarre's responsibility did not include defending Laos. However, its decision, which was drawn up on 13 November, was not delivered to him until 4 December, two weeks after the Điện Biên Phủ operation began.
Establishment of air operations.
Operations at Điện Biên Phủ began at 10:35 on 20 November 1953. In "Operation Castor", the French dropped or flew 9,000 troops into the area over three days, as well as a bulldozer to prepare the airstrip. They were landed at three drop zones: "Natasha" (northwest of Điện Biên Phủ), "Octavie" (to the southwest), and "Simone" (to the southeast). The Viet Minh elite 148th Independent Infantry Regiment, headquartered at Điện Biên Phủ, reacted "instantly and effectively". Three of its four battalions, however, were absent. Initial operations proceeded well for the French. By the end of November, six parachute battalions had been landed, and the French Army consolidated its positions.
It was at this time that Giáp began his countermoves. He had expected an attack but had not foreseen when or where it would occur. Giáp realized that, if pressed, the French would abandon Lai Châu Province and fight a pitched battle at Điện Biên Phủ. On 24 November, Giáp ordered the 148th Infantry Regiment and the 316th Division to attack Lai Chau, while the 308th, 312th, and 351st divisions assaulted Điện Biên Phủ from "Việt Bắc".
Starting in December, the French, under the command of Colonel Christian de Castries, began transforming their anchoring point into a fortress by setting up seven satellite positions. (Each was said to be named after a former mistress of de Castries, although the allegation is probably unfounded, as the eight names begin with letters from the first nine of the alphabet.) The fortified headquarters was centrally located, with positions "Huguette" to the west, "Claudine" to the south, and "Dominique" to the northeast. The other positions were "Anne-Marie" to the northwest, "Beatrice" to the northeast, "Gabrielle" to the north, and "Isabelle" to the south, covering the reserve airstrip.
The arrival of the 316th Viet Minh Division prompted Cogny to order the evacuation of the Lai Chau garrison to Điện Biên Phủ, exactly as Giáp had anticipated. En route, they were virtually annihilated by the Viet Minh. "Of the 2,100 men who left Lai Chau on 9 December, only 185 made it to Điện Biên Phủ on 22 December. The rest had been killed, captured, or "deserted".
French military forces had committed 10,800 troops, together with yet more reinforcements, totalling nearly 16,000 men, to the defense of a monsoon-affected valley surrounded by heavily-wooded hills and high ground that had not been secured. Artillery as well as ten US M24 Chaffee light tanks (each broken down into 180 individual parts, flown into the base, and then re-assembled) and numerous aircraft (attack and supply types) were committed to the garrison. A number