First Indochina War The First Indochina War ( generally known as the Indochina War in France , and as the Anti - French Resistance War in contemporary Vietnam ) began in French Indochina on 19 December 1946 and lasted until 1 August 1954 . Fighting between French forces and their Viet Minh opponents in the South dates from September 1945 . The conflict pitted a range of forces , including the French Union ' s French Far East Expeditionary Corps , led by France and supported by Emperor Bao Dai ' s Vietnamese National Army against the Viet Minh , led by Ho Chi Minh and Vo Nguyen Giap . Most of the fighting took place in Tonkin in Northern Vietnam , although the conflict engulfed the entire country and also extended into the neighboring French Indochina protectorate s of Laos and Cambodia . Following the reoccupation of Indochina by the French following the end of World War II , the area having fallen to the Japanese , the Viet Minh launched a rebellion against the French authority governing the colonies of French Indochina . The first few years of the war involved a low - level rural insurgency against French authority . However , after the Chinese communists reached the Northern border of Vietnam in 1949 , the conflict turned into a conventional war between two armies equipped with modern weapons supplied by the United States and the Soviet Union . French Union forces included colonial troops from the whole former empire ( Moroccan , Algerian , Tunisian , Laotian , Cambodian , and Vietnamese ethnic minorities ) , French professional troops and units of the French Foreign Legion . The use of metropolitan recruits was forbidden by the government to prevent the war from becoming even more unpopular at home . It was called the " dirty war " ( " la sale guerre " ) by supporters of the Left intellectuals in France ( including Jean - Paul Sartre ) during the Henri Martin Affair in 1950 . While the strategy of pushing the Viet Minh into attacking a well defended base in a remote part of the country at the end of their logistical trail was validated at the Battle of Na San , the lack of construction materials ( especially concrete ) , tanks ( because of lack of road access and difficulty in the jungle terrain ) , and air cover precluded an effective defense , culminating in a decisive French defeat at the Battle of Dien Bien Phu . After the war , the Geneva Conference on July 21 , 1954 , made a provisional division of Vietnam at the 17th parallel , with control of the north given to the Viet Minh as the Democratic Republic of Vietnam under Ho Chi Minh , and the south becoming the State of Vietnam under Emperor Bao Dai . A year later , Bao Dai would be deposed by his prime minister , Ngo Dinh Diem , creating the Republic of Vietnam . Soon an insurgency backed by the North developed against Diem ' s government . The war gradually escalated into the Vietnam War between the Democratic Republic of Vietnam and the Republic of Vietnam backed by heavy US intervention . Background . Vietnam was absorbed into French Indochina in stages between 1858 and 1887 with European influence and education . Nationalism grew until World War II provided a break in French control . Early Vietnamese resistance centered on the intellectual Phan Boi Chau . Chau looked to Japan , which had modernized and was one of the few Asian nations to resist European colonization . With Prince Cuong De , Chau started two organizations in Japan , the Duy Tan Hoi ( Modernistic Association ) and Vietnam Cong Hien Hoi . Due to French pressure , Japan deported Phan Boi Chau to China . Witnessing Sun Yat - sen ' s 1911 nationalist revolution , Chau was inspired to commence the Viet Nam Quang Phục Hội movement in Guangzhou . From 1914 to 1917 , he was imprisoned by Yuan Shikai ' s counterrevolutionary government . In 1925 , he was captured by French agents in Shanghai and spirited to Vietnam . Due to his popularity , Chau was spared from execution and placed under house arrest until his death in 1940 . In September 1940 , shortly after Phan Boi Chau ' s death , Japan launched the First French Indochina Campaign and invaded French Indochina , mirroring their ally Germany ' s conquest of metropolitan France . Keeping the French colonial administration , the Japanese ruled from behind the scenes in a parallel of Vichy France . As far as Vietnamese nationalists were concerned , this was a double - puppet government . Emperor Bao Dai collaborated with the Japanese , just as he had with the French , ensuring his lifestyle could continue . From October 1940 to May 1941 , during the French - Thai War , the Vichy French in Indochina were involved with defending their colony in a border conflict which saw the forces of Thailand invade , while the Japanese sat on the sidelines . Thai military successes were limited to the Cambodian border area , and in January 1941 Vichy France ' s modern naval forces soundly defeated the inferior Thai naval forces in the Battle of Koh Chang . The war ended in May , with the French agreeing to minor territorial revisions which restored formerly Thai areas to Thailand . In March 1945 , Japan launched the Second French Indochina Campaign and ousted the Vichy French and formally installed Emperor Bao Dai in the short - lived Empire of Vietnam . Japanese forces surrender ( August 1945 ) . On August 22 , 1945 OSS agents Archimedes Patti and Carleton B . Swift Jr . arrived in Hanoi on a mercy mission to liberate allied POWs and were accompanied by Jean Sainteny a French government official . The Japanese forces informally surrendered ( the official surrender took place on September 2 , 1945 in Tokyo Bay ) but being the only force capable of maintaining law and order the Japanese Imperial Army remained in power while keeping French colonial troops and Sainteny detained . Japanese forces allowed the Viet Minh and other nationalist groups to take over public buildings and weapons without resistance , which began the August Revolution . After their defeat the Japanese Army gave weapons to the Vietminh . In order to further help the nationalists , the Japanese kept Vichy French officials and military officers imprisoned for a month after the surrender . OSS officers met repeatedly with Ho Chi Minh and other Viet Minh officers during this period and on September 2 , 1945 Ho Chi Minh declared independence from France for Vietnam . The Viet Minh had recruited more than 600 Japanese soldiers and given them roles to train or command Vietnamese soldiers . Ho Chi Minh claimed in a speech in September 1945 that due to a combination of ruthless Japanese exploitation and poor weather , a famine occurred in which approximately 2 million Vietnamese died . The Viet Minh arranged a relief effort in the north and won wide support there as a result . American President Franklin D . Roosevelt and General Joseph Stilwell privately made it adamantly clear that the French were not to reacquire French Indochina ( modern day Vietnam , Cambodia and Laos ) after the war was over . Roosevelt offered Chiang Kai - shek to place all of Indochina under Chinese rule . Chiang Kai - shek supposedly replied : " Under no circumstances ! " . In mid - September 200 , 000 troops of the Chinese 1st Army arrived in what would become North Vietnam ( Indochina above the 16th parallel ) . They had been sent by Chiang Kai - shek under General Lu Han to accept the surrender of Japanese occupying forces occupying that area which had been designated to Chiang Kai - Shek under Supreme Commander for the Allied Powers General Order no . One . The Chinese forces remained there until 1946 and initially kept the French Colonial soldiers interned with the acquiescence of the Americans . The Chinese used the VNQDD , the Vietnamese branch of the Chinese Kuomintang , to increase their influence in Indochina and put pressure on their opponents . Chiang Kai - shek threatened the French with war in response to manoeuvering by the French and Ho Chi Minh against each other , forcing them to come to a peace agreement , and in February 1946 he also forced the French to surrender all of their concessions in China and renounce their extraterritorial privileges in exchange for withdrawing from northern Indochina and allowing French troops to reoccupy the region starting in March 1946 . Ho Chi Minh was able to persuade Emperor Baoi Dai to abdicate on August 25 , 1945 . Bao Dai was appointed " supreme advisor " to the new Vietminh - led government in Hanoi , which asserted independence on September 2 . Deliberately borrowing from the Declaration of Independence of the United States of America , Ho Chi Minh proclaimed on September 2 : " We hold the truth that all men are created equal , that they are endowed by their Creator with certain unalienable rights , among them life , liberty and the pursuit of happiness . " With the fall of the short lived Japanese colony of the Empire of Vietnam , the Provisional Government of the French Republic wanted to restore its colonial rule in French Indochina as the final step of the Liberation of France . An armistice was signed between Japan and the United States on August 20 . CEFEO Expeditionary Corps leader General Leclerc signed the armistice with Japan on board the on behalf of France , on September 2 . On September 13 , a Franco - British task force landed in Java , main island of the Dutch East Indies ( for which independence was being sought by Sukarno ) , and Saigon , capital of Cochinchina ( southern part of French Indochina ) , both being occupied by the Japanese and ruled by Field Marshal Hisaichi Terauchi , Commander - in - Chief of Japan ' s Southern Expeditionary Army Group based in Saigon . Allied troops in Saigon were an airborne detachment , two British companies of the 20th Hindi Division and the French 5th Colonial Infantry Regiment , with British General Sir Douglas Gracey as supreme commander . The latter proclaimed martial law on September 21 . The following night the Franco - British troops took control of Saigon . Almost immediately afterward , the Chinese Government , as agreed to at the Potsdam Conference , occupied French Indochina as far south as the 16th parallel in order to supervise the disarming and repatriation of the Japanese Army . This effectively ended Ho Chi Minh ' s nominal government in Hanoi . General Leclerc arrived in Saigon on October 9 , with him was French Colonel Massu ' s March Group ( " Groupement de marche " ) . Leclerc ' s primary objectives were to restore public order in south Vietnam and to militarize Tonkin ( north Vietnam ) . Secondary objectives were to wait for French backup in view to take back Chinese occupied Hanoi , then to negotiate with the Viet Minh officials . Timeline . 1946 . Fighting broke out in Haiphong after a conflict of interest in import duty at the port between the Viet Minh government and the French . On November 23 , 1946 the French fleet began a naval bombardment of the city that killed over 6 , 000 Vietnamese civilians in one afternoon according to one source or over 2 , 000 according to another . The Viet Minh quickly agreed to a cease - fire and left the cities . There was never any intention among the Vietnamese to give up , as General Vo Nguyen Giap soon brought up 30 , 000 men to attack the city . Although the French were outnumbered , their superior weaponry and naval support made any Viet Minh attack impossible . In December , hostilities also broke out in Hanoi between the Viet Minh and the French , and Ho Chi Minh was forced to evacuate the capital in favor of remote mountain areas . Guerrilla warfare ensued , with the French controlling most of the country except far - flung areas . 1947 . In 1947 , General Vo Nguyen Giap retreated his command to Tan Trao deep in the hills of Tuyen Quang Province . The French sent military expeditions to attack his bases , but Giap refused to meet them head - on in battle . Wherever the French troops went , the Viet Minh disappeared . Late in the year the French launched Operation Lea to take out the Viet Minh communications center at Bac Kan . They failed to capture Ho Chi Minh and his key lieutenants as intended , but 9 , 000 Viet Minh soldiers were killed during the campaign which was a major blow for the insurgency . 1948 . In 1948 , France started looking for means of opposing the Viet Minh politically , with an alternative government in Saigon . They began negotiations with the former Vietnamese emperor Bao Dai to lead an " autonomous " government within the French Union of nations , the State of Vietnam . Two years before , the French had refused Ho ' s proposal of a similar status , albeit with some restrictions on French power and the latter ' s eventual withdrawal from Vietnam . However , they were willing to give it to Bao Dai as he had freely collaborated with French rule of Vietnam in the past and was in no position to seriously negotiate or impose demands ( Bao Dai had no military of his own , but soon he would have one ) . 1949 . In 1949 , France officially recognized the " independence " of the State of Vietnam as an associated state within the French Union under Bao Dai . However , France still controlled all foreign relations and every defense issue as Vietnam was only nominally an independent state within the French Union . The Viet Minh quickly denounced the government and stated that they wanted " real independence , not Bao Dai independence " . Later on , as a concession to this new government and a way to increase their numbers , France agreed to the formation of the Vietnamese National Army to be commanded by Vietnamese officers . These troops were used mostly to garrison quiet sectors so French forces would be available for combat . Private Cao Dai , Hoa Hao and the Binh Xuyen gangster armies were used in the same way . The Vietnamese Communists in return obtained outside support in 1949 when Chairman Mao Zedong succeeded in taking control of China by defeating the Kuomintang , thus gaining a major political ally and supply area just across the border . In the same year , the French also granted independence ( within the framework of the French Union ) to the other two nations in Indochina , the Kingdoms of Laos and Cambodia . The United States recognized the South Vietnamese state , but many other nations viewed it as simply a French puppet regime and would not deal with it at all . The United States began to give military aid to France in the form of weaponry and military observers . By then with almost unlimited Chinese military supplies entering Vietnam , Giap re - organized his local irregular forces into five full conventional infantry divisions , the 304th , 308th , 312th , 316th and the 320th . The war began to intensify when Giap went on the offensive , attacking isolated French bases along the Chinese border . 1950 . In February 1950 , Giap seized the vulnerable 150 - strong French garrison at Lai Khe in Tonkin just south of the border with China . Then , on May 25 , he attacked the garrison of Cao Bang manned by 4 , 000 French - controlled Vietnamese troops , but his forces were repulsed . Giap launched his second offense again against Cao Bang as well as Dong Khe on September 15 . Dong Khe fell on September 18 , and Cao Bang finally fell on October 3 . Lạng Sơn , with its 4 , 000 - strong French Foreign Legion garrison , was attacked immediately after . The retreating French on Route 4 , together with the relief force coming from That Khe , were attacked all the way by ambushing Viet Minh forces . The French air - dropped a paratroop battalion south of Dong Khe to act as diversion only to see it quickly surrounded and destroyed . On October 17 , Lạng Sơn , after a week of intense fighting , finally fell . By the time the remains of the garrisons reached the safety of the Red River Delta , 4 , 800 French troops had been killed , captured or missing in action and 2 , 000 wounded out of a total garrison force of over 10 , 000 . Also lost were 13 artillery pieces , 125 mortars , 450 trucks , 940 machine guns , 1 , 200 submachine guns and 8 , 000 rifles destroyed or captured during the fighting . China and the Soviet Union recognized Ho Chi Minh as the legitimate ruler of Vietnam and sent him more and more supplies and material aid . The year 1950 also marked the first time that napalm was ever used in Vietnam ( this type of weapon was supplied by the U . S . for the use of the French Aeronovale at the time ) . The military situation improved for France when their new commander , General Jean Marie de Lattre de Tassigny , built a fortified line from Hanoi to the Gulf of Tonkin , across the Red River Delta , to hold the Viet Minh in place and use his troops to smash them against this barricade , which became known as the " De Lattre Line " . This led to a period of success for the French . 1951 . On January 13 , 1951 , Giap moved the 308th and 312th Divisions , made up of over 20 , 000 men , to attack Vinh Yen , northwest of Hanoi which was manned by the 6 , 000 strong 9th Foreign Legion Brigade . The Viet Minh entered a trap . Caught for the first time in the open and actually forced to fight the French head - on , without the ability to quickly hide and retreat , they were mown down by concentrated French artillery and machine gun fire . By January 16 , Giap was forced to withdraw , having lost over 6 , 000 killed , 8 , 000 wounded and 500 captured . The Battle of Vinh Yen had been a catastrophe . On March 23 , Giap tried again , launching an attack against Mao Khe , north of Haiphong . The 316th Division , composed of 11 , 000 men , with the partly rebuilt 308th and 312th Divisions in reserve , went forward and were beaten in bitter hand - to - hand fighting against French troops . Giap , having lost over 3 , 000 ( French estimation ) / ~ 500 ( Viet Minh information ) dead and wounded by March 28 , withdrew . Giap launched yet another attack on May 29 with the 304th Division at Phu Ly , the 308th Division at Ninh Bình , and the main attack delivered by the 320th Division at Phat Diem south of Hanoi . The attacks fared no better and the three divisions lost heavily . Taking advantage of this , de Lattre mounted his counter offensive against the demoralized Viet Minh , driving them back into the jungle and eliminating the enemy pockets in the Red River Delta by June 18 costing the Viet Minh over 10 , 000 killed . Every effort by Vo Nguyen Giap to break the line failed and every attack he made was answered by a French counter - attack that destroyed his forces . Viet Minh casualties rose alarmingly during this period , leading some to question the leadership of the Communist government , even within the party . However , any benefit this may have reaped for France was negated by the increasing domestic opposition to the war in France . On July 31 , French General Charles Chanson was assassinated during a kamikaze attentat at Sa Dec in South Vietnam that was blamed on the Viet Minh although it was argued in some quarters that Cao Dai nationalist Trinh Minh The could have been involved in its planning . On November 14 , 1951 , the French seized Hoa Binh , west of the De Lattre line , by a parachute drop and expanded their perimeter . 1952 . Viet Minh launched attacks on Hoa Binh forcing the French to withdraw back to their main positions on the De Lattre line by February 22 , 1952 . Each side lost nearly 5 , 000 men in this campaign and it showed that the war was far from over . In January , General de Lattre fell ill from cancer and had to return to France for treatment . He died there shortly thereafter and was replaced by General Raoul Salan as the overall commander of French forces in Indochina . Throughout the war theater , the Viet Minh cut French supply lines and began to seriously wear down the resolve of the French forces . There were continued raids , skirmishes and guerrilla attacks , but through most of the rest of the year each side withdrew to prepare itself for larger operations . Starting on October 2 , the Battle of Na San saw the first use of the French commanders " hedgehog " tactics consisting in setting up a well defended outpost to get the Viet Minh out of the jungle and force it to fight a conventional battle instead of ambushes . At first this strategy was successful for the French Union but it ended with a fiasco in 1954 . On October 17 , 1952 , Giap launched attacks against the French garrisons along Nghia Lo , northwest of Hanoi , and overran much of the Black River valley , except for the airfield of Na San where a strong French garrison entrenched . Giap by now had control over most of Tonkin beyond the De Lattre line . Raoul Salan , seeing the situation as critical , launched Operation Lorraine along the Clear River to force Giap to relieve pressure on the Nghia Lo outposts . On October 29 , 1952 , in the largest operation in Indochina to date , 30 , 000 French Union soldiers moved out from the De Lattre line to attack the Viet Minh supply dumps at Phu Yen . Salan took Phu Tho on November 5 , and Phu Doan on November 9 by a parachute drop , and finally Phú Yên on November 13 . Giap at first did not react to the French offensive . He planned to wait until their supply lines were over extended and then cut them off from the Red River Delta . Salan correctly guessed what the Viet Minh were up to and cancelled the operation on November 14 , beginning to withdraw back to the de Lattre line . The only major fighting during the operation came during the withdrawal , when the Viet Minh ambushed the French column at Chan Muong on November 17 . The road was cleared after a bayonet charge by the Indochinese March Battalion and the withdrawal could continue . The French lost around 1 , 200 men during the whole operation , most of them during the Chan Muong ambush . Though the operation was partially successful , it proved that although the French could strike out at any target outside the De Lattre line , it failed to divert the Viet Minh offensive or seriously damage its logistical network . 1953 . On April 9 , 1953 , Giap , after having failed repeatedly in direct attacks on French positions in Vietnam , changed strategy and began to pressure the French by invading Laos , surrounding and defeating several French outposts such as Muong Khoua . The only real change came in May when General Henri Navarre replaced Salan as supreme commander in Indochina . He reported to the government " . . . that there was no possibility of winning the war in Indo - China " saying that the best the French could hope for was a stalemate . Navarre , in response to the Viet Minh attacking Laos , concluded that " hedgehog " centers of defense were the best plan . Looking at a map of the area , Navarre chose the small town of Dien Bien Phu , located about north of the Lao border and west of Hanoi as a target to block the Viet Minh from invading Laos . Dien Bien Phu had a number of advantages ; it was on a Viet Minh supply route into Laos on the Nam Yum River , it had an old airstrip for supply and it was situated in the Tai hills where the Tai tribesmen , still loyal to the French , operated . Operation Castor was launched on November 20 , 1953 with 1 , 800 men of the French 1st and 2nd Airborne Battalions dropping into the valley of Dien Bien Phu and sweeping aside the local Viet Minh garrison . The paratroopers gained control of a heart - shaped valley long and wide surrounded by heavily wooded hills . Encountering little opposition , the French and Tai units operating from Lai Chau to the north patrolled the hills . The operation was a tactical success for the French . However , Giap , seeing the weakness of the French position , started moving most of his forces from the De Lattre line to Dien Bien Phu . By mid - December , most of the French and Tai patrols in the hills around the town were wiped out by Viet Minh ambushes . The fight for control of this position would be the longest and hardest battle for the French Far East Expeditionary Corps and would be remembered by the veterans as " 57 Days of Hell " . 1954 . By 1954 , despite official propaganda presenting the war as a " " crusade against communism " " , the war in Indochina was still growing unpopular with the French public . The political stagnation of the Fourth Republic meant that France was unable to extract itself from the conflict . The United States initially sought to remain neutral , viewing the conflict as chiefly a decolonization war . The Battle of Dien Bien Phu occurred in 1954 between Viet Minh forces under Vo Nguyen Giap supported by China and the Soviet Union and the French Union ' s French Far East Expeditionary Corps supported by Indochinese allies . The battle was fought near the village of Dien Bien Phu in northern Vietnam and became the last major battle between the French and the Vietnamese in the First Indochina War . The battle began on March 13 when preemptive Viet Minh attack surprised the French with heavy artillery . The artillery damaged both the main and secondary airfields that the French were using to fly in supplies . The only road into Dien Bien Phu , already difficult to traverse , was also knocked out by Viet Minh forces . Their supply lines interrupted , the French position became untenable , particularly when the advent of the monsoon season made dropping supplies and reinforcements by parachute difficult . With defeat imminent , the French sought to hold on until the opening of the Geneva peace meeting on April 26 . The last French offensive took place on May 4 , but it was ineffective . The Viet Minh then began to hammer the outpost with newly supplied Russian Katyusha rockets along with all the other inventions and implements now being turned against the French . The final fall took two days , May 6 and 7 , during which the French fought on but were eventually overrun by a huge frontal assault . General Cogny based in Hanoi ordered General de Castries , who was commanding the outpost to cease fire at 5 : 30 pm and to destroy all material ( weapons , transmissions , etc . ) to deny their use to the enemy . A formal order was given to not use the white flag so that it would not be considered to be a surrender but a ceasefire . Much of the fighting ended on May 7 ; however , a ceasefire was not respected on Isabelle , the isolated southern position , where the battle lasted until May 8 1 : 00 am . At least 2 , 200 members of the 20 , 000 - strong French forces died , and another 1 , 729 were reported missing after the battle . Of the 50 , 000 or so Vietnamese soldiers thought to be involved , there were an estimated 4 , 800 to 8 , 000 killed and another 9 , 000 – 15 , 000 wounded . The prisoners taken at Dien Bien Phu were the greatest number the Viet Minh had ever captured : one - third of the total captured during the entire war . One month after Dien Bien Phu , the composite Groupe Mobile 100 ( GM100 ) of the French Union forces evacuated the An Khe outpost and was ambushed by a larger Viet Minh force at the Battle of Mang Yang Pass from June 24 to July 17 . On the same time , Giap launched some offensives against the delta but they all failed . The Viet Minh victory at Dien Bien Phu heavily influenced the outcome of the 1954 Geneva accords that took place on July 21 . In August Operation Passage to Freedom began , consisting of the evacuation of Catholic and loyalist Vietnamese civilians from communist North Vietnamese persecution . Geneva Conference and Partition . Negotiations between France and the Viet Minh started in Geneva in April 1954 at the Geneva Conference , during which time the French Union and the Viet Minh were fighting a battle at Dien Bien Phu . In France , Pierre Mendès France , opponent of the war since 1950 , had been invested as Prime Minister on June 17 , 1954 , on a promise to put an end to the war , reaching a ceasefire in four months : The Geneva Conference on July 21 , 1954 , recognized the 17th parallel as a " provisional military demarcation line " temporarily dividing the country into two zones , Communist North Vietnam and pro - Western South Vietnam . The Geneva Accords promised elections in 1956 to determine a national government for a united Vietnam . Neither the United States government nor Ngo Dinh Diem ' s State of Vietnam signed anything at the 1954 Geneva Conference . With respect to the question of reunification , the non - communist Vietnamese delegation objected strenuously to any division of Vietnam , but lost out when the French accepted the proposal of Viet Minh delegate Pham Van Dong , who proposed that Vietnam eventually be united by elections under the supervision of " local commissions " . The United States countered with what became known as the " American Plan " , with the support of South Vietnam and the United Kingdom . It provided for unification elections under the supervision of the United Nations , but was rejected by the Soviet delegation . From his home in France , Emperor Bao Dai appointed Ngo Dinh Diem as Prime Minister of South Vietnam . With American support , in 1955 Diem used a referendum to remove the former Emperor and declare himself the president of the Republic of Vietnam . When the elections failed to occur , Viet Minh cadres who stayed behind in South Vietnam were activated and started to fight the government . North Vietnam also invaded and occupied portions of Laos to assist in supplying the guerilla fighting National Liberation Front in South Vietnam . The war gradually escalated into the Second Indochina War , more commonly known as the " Vietnam War " in the West and the " American War " in Vietnam . Ho Chi Minh . In 1923 , Ho Chi Minh moved to Guangzhou , China . From 1925 – 26 , he organized the ' Youth Education Classes ' and occasionally gave lectures at the famous Whampoa Military Academy on the revolutionary movement in Indochina . He stayed there in Hong Kong as a representative of the organization . In June 1931 , he was arrested and incarcerated by British police until his release in 1933 . He then made his way back to the Soviet Union , where he spent several years recovering from tuberculosis . In 1938 , he returned to China and served as an adviser with the Chinese Communist armed forces . In 1941 , Ho Chi Minh , seeing communist revolution as the path to freedom , returned to Vietnam and formed the " Viet Nam Doc Lap Dong Minh Hoi " ( League for the Independent of Vietnam ) , better known as the Viet Minh . He spent many years in Moscow and participated in the International Comintern . At the direction of Moscow , he combined the various Vietnamese communist groups into the in Hong Kong in 1930 . Ho created the Viet Minh as an umbrella organization for all the nationalist resistance movements , de - emphasizing his communist social revolutionary background . Late in the war , the Japanese created a nominally independent government of Vietnam under the overall leadership of Bao Dai . Around the same time , the Japanese arrested and imprisoned most of the French officials and military officers left in the country . After the French army and other officials were freed from Japanese prisons in Vietnam , they began reasserting their authority over parts of the country . At the same time , the French government began negotiations with both the Viet Minh and the Chinese for a return of the French army to Vietnam north of the 16th parallel . The Viet Minh were willing to accept French rule to end Chinese occupation . Ho and others had fears of the Chinese , based on China ' s historic domination and occupation of Vietnam . The French negotiated a deal with the Chinese where pre - war French concessions in Chinese ports such as Shanghai were traded for Chinese cooperation in Vietnam . The French landed a military force at Haiphong in early 1946 . Negotiations then took place about the future for Vietnam as a state within the French Union . These talks eventually failed and the Viet Minh fled into the countryside to wage guerrilla war . In 1946 , Vietnam created its first constitution . The British had supported the French in fighting the Viet Minh , armed militias from the religious Cao Dai and Hoa Hao sects and the Binh Xuyen organized crime groups which were all individually seeking power in the country . In 1948 , as part of a post - colonial solution , the French re - installed Bao Dai as head of state of Vietnam under the French Union . The Viet Minh were militarily ineffective in the first few years of the war and could do little more than harass the French in remote areas of Indochina . In 1949 , the war changed with the triumph of the communists in China on Vietnam ' s northern border . China was able to give almost unlimited support in terms of weapons and supplies to the Viet Minh which transformed itself into a conventional army . After World War II , the United States and the USSR entered into the Cold War . The Korean War broke out in 1950 between communist North Korea ( DPRK ) supported by China and the Soviet Union , and South Korea ( ROK ) supported by the United States and its allies in the UN . The Cold War was now turning ' hot ' in East Asia , and the American government feared communist domination of the entire region would have deep implications for American interests . The US became strongly opposed to the government of Ho Chi Minh , in part , because it was supported and supplied by China . Ho ' s government gained recognition from China and the Soviet Union by January 1950 in response to Western support for the State of Vietnam that the French had proposed as an associate state within the French Union . In the French - controlled areas of Vietnam , in the same year , the government of Bao Dai gained recognition by the United States and the United Kingdom . French domestic situation . The 1946 Constitution creating the Fourth Republic ( 1946 – 1958 ) made France a Parliamentary republic . Because of the political context , it could find stability only by an alliance between the three dominant parties : the Christian Democratic Popular Republican Movement ( MRP ) , the French Communist Party ( PCF ) and the socialist French Section of the Workers ' International ( SFIO ) . Known as " tripartisme " , this alliance briefly lasted until the May 1947 crisis , with the expulsion from Paul Ramadier ' s SFIO government of the PCF ministers , marking the official start of the Cold War in France . This had the effect of weakening the regime , with the two most significant movements of this period , Communism and Gaullism , in opposition . Unlikely alliances had to be made between left and right - wing parties in order to form a government invested by the National Assembly , which resulted in strong parliamentary unstability . Hence , France had fourteen prime ministers in succession between the creation of the Fourth Republic in 1947 and the Battle of Dien Bien Phu in 1954 . The rapid turnover of governments ( there were 17 different governments during the war ) left France unable to prosecute the war with any consistent policy according to veteran General René de Biré ( who was a lieutenant at Dien Bien Phu ) . France was increasingly unable to afford the costly conflict in Indochina and , by 1954 , the United States was paying 80 % of France ' s war effort which was $ 3 , 000 , 000 per day in 1952 . A strong anti - war movement came into existence in France driven mostly by the then powerful French Communist Party ( outpowering the socialists ) and its young militant associations , major trade unions like the General Confederation of Labour as well as notable leftist intellectuals . The first occurrence was probably at the National Assembly on March 21 , 1947 when the communist deputees refused to back the military credits for Indochina . The following year a pacifist event was organized , the " 1st Worldwide Congress of Peace Partisans " ( " 1er Congrès Mondial des Partisans de la Paix " , the World Peace Council ' s predecessor ) which took place between March 25 – 28 , 1948 in Paris , with the French communist Nobel laureate atomic physicist Frédéric Joliot - Curie as president . Later on April 28 , 1950 , Joliot - Curie would be dismissed from the military and civilian Atomic Energy Commission for political reasons . Young communist militants ( UJRF ) were also accused of sabotage actions like the famous Henri Martin Affair and the case of Raymonde Dien who was jailed one year for having blocked an ammunition train , with the help of other militants , in order to prevent the supply of French forces in Indochina in February 1950 . Similar actions against trains occurred in Roanne , Charleville , Marseille , and Paris . Even ammunition sabotage by PCF agents have been reported , such as grenades exploding in the hands of legionaries . These actions became such a cause for concern by 1950 that the French Assembly voted a law against sabotage between March 2 – 8 . At this session tension was so high between politicians that fighting ensued in the assembly following communist deputees speeches against the Indochinese policy . This month saw the French navy mariner and communist militant Henri Martin arrested by military police and jailed for five years for sabotage and propaganda operations in Toulon ' s arsenal . On May 5 communist Ministers were dismissed from the government , marking the end of Tripartism . A few months later on November 11 , 1950 , the French Communist Party leader Maurice Thorez went to Moscow . Some military officers involved in the Revers Report scandal ( " Rapport Revers " ) like Salan were pessimistic about the way the war was being conducted , with multiple political - military scandals all happening during the war , starting with the Generals ' Affair ( " Affaire des Généraux " ) from September 1949 to November 1950 . As a result , General Georges Revers was dismissed in December 1949 and socialist Defense Ministry Jules Moch ( SFIO ) was brought on court by the National Assembly on November 28 , 1950 . Emerging media played their role . The scandal started the commercial success of the first French news magazine " L ' Express " created in 1953 . The third scandal was a financial - political scandal , concerning military corruption , money and arms trading involving both the French Union army and the Viet Minh , known as the Piastres Affair . The war ended in 1954 but its sequel started in French Algeria where the French Communist Party played an even stronger role by supplying the National Liberation Front ( FLN ) rebels with intelligence documents and financial aids . They were called " the suitcase carriers " ( " les porteurs de valises " ) . In the French news , the Indochina War was presented as a direct continuation of the Korean War where France had fought as a UN French battalion then incorporated in a U . S . unit , which was later involved in the terrible Battle of Mang Yang Pass of June and July 1954 . In an interview taped in May 2004 , General Marcel Bigeard ( 6th BPC ) argues that " one of the deepest mistakes done by the French during the war was the propaganda telling you are fighting for Freedom , you are fighting against Communism " , hence the sacrifice of volunteers during the climactic battle of Dien Bien Phu . In the latest days of the siege , 652 non - paratrooper soldiers from all army corps from cavalry to infantry to artillery dropped for the first and last time of their life to support their comrades . The Cold War excuse was later used by General Maurice Challe through his famous " Do you want Mers El Kébir and Algiers to become Soviet bases as soon as tomorrow ? " , during the Generals ' putsch ( Algerian War ) of 1961 , with limited effect though . The same propaganda existed in the United States with local newsreels using French news footage , probably supplied by the army ' s cinematographic service . Occurring during the Red Scare years , propaganda was necessary both to justify financial aid and at the same time to promote the American effort in the ongoing Korean War . A few hours after the French Union defeat at Dien Bien Phu in May 1954 , United States Secretary of State John Foster Dulles made an official speech depicting the " tragic event " and " its defense for fifty seven days and nights will remain in History as one of the most heroic of all time . " Later on , he denounced Chinese aid to the Viet Minh , explained that the United States could not act openly because of international pressure , and concluded with the call to " all concerned nations " concerning the necessity of " a collective defense " against " the communist aggression " . Other countries ' involvement . By 1946 , France headed the French Union . As successive governments had forbidden the sending of metropolitan troops , the French Far East Expeditionary Corps ( CEFEO ) was created in March 1945 . The Union gathered combatants from almost all French territories made of colonies , protectorates and associated states ( Madagascar , Senegal , Tunisia , etc . ) to fight in French Indochina , which was then occupied by the Japanese . About 325 , 000 of the 500 , 000 French troops were Indochinese , almost all of whom were used in conventional units . The Afrique Occidentale Française ( AOF ) was a federation of African colonies . Senegalese and other African troops were sent to fight in Indochina . Some African alumni were trained in the Infantry Instruction Center no . 2 ( " Centre d ' Instruction de l ' Infanterie no . 2 " ) located in southern Vietnam . Senegalese of the Colonial Artillery fought at the siege of Dien Bien Phu . As a French colony ( later a full province ) , French Algeria sent local troops to Indochina including several RTA ( " Régiment de Tirailleurs Algériens " ) light infantry battalions . Morocco was a French protectorate and sent troops to support the French effort in Indochina . Moroccan troops were part of light infantry RTMs ( " Régiment de Tirailleur s Marocains " ) for " Moroccan Sharpshooters Regiment " . As a French protectorate , Bizerte , Tunisia , was a major French base . Tunisian troops , mostly RTT ( " Régiment de Tirailleurs Tunisiens " ) , were sent to Indochina . Part of French Indochina , then part of the French Union and later an associated state , Laos fought the communists along with French forces . The role played by Laotian troops in the conflict was depicted by veteran Pierre Schoendoerffer ' s famous " 317th Platoon " released in 1964 . The French Indochina state of Cambodia played a significant role during the Indochina War through its infantrymen and paratroopers . While Bao Dai ' s State of Vietnam ( formerly Annam , Tonkin , Cochinchine ) had the Vietnamese National Army supporting the French forces , some minorities were trained and organized as regular battalions ( mostly infantry " tirailleurs " ) that fought with French forces against the Viet Minh . The Tai Battalion 2 ( BT2 , " 2e Bataillon Thai " ) is famous for its desertion during the siege of Dien Bien Phu . Propaganda leaflets written in Tai and French sent by the Viet Minh were found in the deserted positions and trenches . Such deserters were called the " Nam Yum rats " by Bigeard during the siege , as they hid close to the Nam Yum river during the day and searched at night for supply drops . Another allied minority was the Muong people ( " Mường " ) . The 1st Muong Battalion ( " 1er Bataillon Muong " ) was awarded the " Croix de guerre des théâtres d ' opérations extérieures " after the victorious Battle of Vinh Yen in 1951 . In the 1950s , the French established secret commando groups based on loyal montagnard ethnic minorities referred as " partisan s " or " maquisard s " , called the " Groupement de Commandos Mixtes Aéroportés " ( Composite Airborne Commando Group or GCMA ) , later renamed " Groupement Mixte d ' Intervention " ( GMI , or Mixed Intervention Group ) , directed by the SDECE counter - intelligence service . The SDECE ' s " Service Action " GCMA used both commando and guerrilla techniques and operated in intelligence and secret missions from 1950 to 1955 . Declassified information about the GCMA include the name of its commander , famous Colonel Roger Trinquier , and a mission on April 30 , 1954 , when Jedburgh veteran Captain Sassi led the Meo partisans of the GCMA Malo - Servan in Operation Condor during the siege of Dien Bien Phu . In 1951 , Adjutant - Chief Vandenberghe from the 6th Colonial Infantry Regiment ( 6e RIC ) created the " Commando Vanden " ( aka " Black Tigers " , aka " North Vietnam Commando # 24 " ) based in Nam Dinh . Recruits were volunteers from the Tho people , Nung people and Miao people . This commando unit wore Viet Minh black uniforms to confuse the enemy and used techniques of the experienced Bo doi ( " Bộ đội " , regular army ) and Du Kich ( guerrilla unit ) . Viet Minh prisoners were recruited in POW camps . The commando was awarded the " Croix de guerre des TOE " with palm in July 1951 , however Vandenberghe was betrayed by a Viet Minh recruit , commander Nguien Tinh Khoi ( 308th Division ' s 56th Regiment ) , who assassinated him ( and his Vietnamese fiancee ) with external help on the night of January 5 , 1952 . Coolie s and POW s known as " PIM " ( " Prisonniers Internés Militaires " which is basically the same as POW ) were civilians used by the army as logistical support personnel . During the battle of Dien Bien Phu , coolies were in charge of burying the corpses – the first days only , after they were abandoned hence a terrible smell according to veterans – and they had the dangerous job of gathering supply packets delivered in drop zones while the Viet Minh artillery was firing hard to destroy the crates . The Viet Minh also used thousands of coolies to carry the Chu - Luc ( regional units ) supplies and ammunition during assaults . The PIM were civilian males old enough to join Bao Dai ' s army . They were captured in enemy controlled villages , and those who refused to join the State of Vietnam ' s army were considered prisoners or used as coolies to support a given regiment . One point that the French had a major problem with , was the concept of sanctuary . As long as the revolutionaries who are fighting a guerilla war have a sanctuary , in which they can hide out , recoup after losses , and store supplies , it is almost impossible for any foreign enemy to ever destroy them . In the early 1950s , southern China was used as a sanctuary by Viet Minh guerrillas . Several hit and run ambushes were successfully operated against French Union convoys along the neighboring Route Coloniale 4 ( RC 4 ) which was a major supply way in Tonkin ( northern Vietnam ) . One of the most famous attack of this kind was the battle of Cao Bằng . China supplied the Viet Minh guerrillas with food ( thousands of tons of rice ) , money , medics , arms , ammunitions , artillery ( 24 guns were used at Dien Bien Phu ) and other military equipment including a large part of material captured from Chiang Kai - shek ' s National Revolutionary Army during the Chinese Civil War . Evidences of the Chinese secret aid were found in caves during Operation Hirondelle in July 1953 . 2 , 000 Chinese and Soviet Union military advisors trained the Viet Minh guerrilla to turn it into a full range army . On top of this China sent two artillery battalions at the siege of Dien Bien Phu on May 6 , 1954 . One operated 12 x 6 Katyusha rockets China and the Soviet Union were the first nations to recognize North Vietnam . The Soviet Union was the other ally of the Viet Minh supplying GAZ trucks , truck engines , fuel , tires , arms ( thousands of Skoda light machine guns ) , all kind of ammunitions , anti - aircraft guns ( 4 x 37 mm type ) and cigarettes . During Operation Hirondelle , the French Union paratroopers captured and destroyed tons of Soviet supply in the Ky Lua area . According to General Giap , the Viet Minh used 400 GAZ - 51 soviet - built trucks at the battle of Dien Bien Phu . Using highly effective camouflage , the French Union reconnaissance planes were not able to notice them . On May 6 , 1954 during the siege , Katyusha were successfully used against the outpost . Together with China , the Soviet Union sent 2 , 000 military advisors to train the Viet Minh and turn it into a fully organized army . The Soviet Union and China were the first nations to recognize Ho Chi Minh ' s North Vietnam . Mutual Defense Assistance Act ( 1950 – 1954 ) . At the beginning of the war , the U . S . was neutral in the conflict because of opposition to imperialism , because the Viet Minh had recently been their allies , and because most of its attention was focused on Europe where Winston Churchill argued an Iron Curtain had fallen . Then the U . S . government gradually began supporting the French in their war effort , primarily through the Mutual Defense Assistance Act , as a means of stabilizing the French Fourth Republic in which the French Communist Party was a significant political force . A dramatic shift occurred in American policy after the victory of Mao Zedong ' s Communist Party of China in the Chinese Civil War . By 1949 , however , the United States became concerned about the spread of communism in Asia , particularly following the end of the Chinese Civil War , and began to strongly support the French as the two countries were bound by the Cold War Mutual Defense Programme . After the Moch – Marshall meeting of September 23 , 1950 , in Washington , the United States started to support the French Union effort politically , logistically and financially . Officially , US involvement did not include use of armed force . However , recently it has been discovered that undercover ( CAT ) - or not - US Air Force pilots flew to support the French during Operation Castor in November 1953 . Two US pilots were killed in action during the siege at Dien Bien Phu the following year . These facts were declassified and made public more than 50 years after the events , in 2005 during the Légion d ' honneur award ceremony by the French ambassador in Washington . In May 1950 , after the capture of Hainan island by Chinese Communist forces , U . S . President Harry S . Truman began covertly authorizing direct financial assistance to the French , and on June 27 , 1950 , after the outbreak of the Korean War , announced publicly that the U . S . was doing so . It was feared in Washington that if Ho were to win the war , with his ties to the Soviet Union , he would establish a puppet state with Moscow with the Soviets ultimately controlling Vietnamese affairs . The prospect of a communist dominated Southeast Asia was enough to spur the U . S . to support France , so that the spread of Soviet - allied communism could be contained . On June 30 , 1950 , the first U . S . supplies for Indochina were delivered . In September , Truman sent the Military Assistance Advisory Group ( MAAG ) to Indochina to assist the French . Later , in 1954 , U . S . President Dwight D . Eisenhower explained the escalation risk , introducing what he referred to as the " domino principle " , which eventually became the concept of Domino theory . During the Korean War , the conflict in Vietnam was also seen as part of a broader proxy war with China and the USSR in Asia . US Navy assistance ( 1951 – 1954 ) . The delivered Grumman F8F Bearcat fighter aircraft to Saigon on January 26 , 1951 . On March 2 of that year , the United States Navy transferred the ( LST 490 ) to the French Navy in Indochina in accordance with the MAAG - led MAP . Renamed RFS " Vulcain " ( A - 656 ) , she was used in Operation Hirondelle in 1953 . The carrier delivered Grumman F8F Bearcat aircraft to Saigon on March 26 , 1951 . During September 1953 , the ( renamed " Bois Belleau " ) was lent to France and sent to French Indochina to replace the " Arromanches " . She was used to support delta defenders in the Halong Bay operation in May 1954 . In August , she joined the Franco - American evacuation operation called " Passage to Freedom " . The same month , the United States delivered additional aircraft , again using the USS " Windham Bay " . On April 18 , 1954 , during the siege of Dien Bien Phu , the delivered 25 Korean War AU - 1 Corsair aircraft for use by the French Aeronavale in supporting the besieged garrison . US Air Force assistance ( 1952 – 1954 ) . A total of 94 F4U - 7s were built for the Aeronavale in 1952 , with the last of the batch , the final Corsair built , rolled out in December 1952 . The F4U - 7s were actually purchased by the U . S . Navy and passed on to the Aeronavale through the U . S . Military Assistance Program ( MAP ) . They were supplemented by 25 ex - U . S . MC AU - 1s ( previously used in the Korean War ) and moved from Yokosuka , Japan to Tourane Air Base ( Da Nang ) , Vietnam in April 1952 . US Air Force assistance followed in November 1953 when the French commander in Indochina , General Henri Navarre , asked General Chester E . McCarty , commander of the Combat Cargo Division , for 12 Fairchild C - 119 for Operation Castor at Dien Bien Phu . The USAF also provided C - 124 Globemasters to transport French paratroop reinforcements to Indochina . On March 3 , 1954 , twelve C - 119s of the 483rd Troop Carrier Wing ( " Packet Rats " ) based at Ashiya , Japan , were painted with France ' s insignia and loaned to France with 24 CIA pilots for short term use . Maintenance was carried out by the US Air Force and airlift operations were commanded by McCarty . Central Intelligence Agency covert operations ( 1954 ) . Twenty four Central Intelligence Agency ( Civil Air Transport ) pilots supplied the French Union garrison during the siege of Dien Bien Phu by airlifting paratroopers , ammunition , artillery pieces , tons of barbed wire , medics and other military material . With the reducing Drop zone areas , night operations and anti - aircraft artillery assaults , many of the " packets " fell into Viet Minh hands . The 37 CIA pilots completed 682 airdrops under anti - aircraft fire between March 13 and May 6 . Two CAT pilots , Wallace Bufford and James B . McGovern , Jr . were killed in action when their Fairchild C - 119 Flying Boxcar was shot down on May 6 , 1954 . On February 25 , 2005 , the French ambassador to the United States , Jean - David Levitte , awarded the seven remaining CIA pilots the Légion d ' honneur . Operation Passage to Freedom ( 1954 ) . In August 1954 , in support to the French navy and the merchant navy , the U . S . Navy launched Operation Passage to Freedom and sent hundreds of ships , including , in order to evacuate non - communist – especially Catholic Vietnamese refugees from North Vietnam following the July 20 , 1954 armistice and partition of Vietnam . Up to 1 million Vietnamese civilians were transported from North to South during this period , with around one tenth of that number moving in the opposite direction . Popular culture . Although a kind of taboo in France , " the dirty war " has been featured in various films , books and songs . Since its declasification in the 2000s ( decade ) , television documentaries have been released using new perspectives about the U . S . covert involvement and open critics about the French propaganda used during wartime . Famous Communist propagandist Roman Karmen was in charge of the media exploitation of the battle of Dien Bien Phu . In his documentary , " Vietnam " ( Вьетнам , 1955 ) , he staged the famous scene with the raising of the Viet Minh flag over de Castries ' bunker which is similar to the one he staged over the Berlin Reichstag roof during World War II ( " Берлин " , 1945 ) and the " S " shaped POW column marching after the battle , where he used the same optical technique he experimented before when he staged the German prisoners after the Siege of Leningrad ( " Ленинград в борьбе " , 1942 ) and the Battle of Moscow ( " Разгром немецких войск под Москвой " , 1942 ) . Hollywood made a film about Dien Bien Phu in 1955 , " Jump Into Hell " , directed by David Butler and scripted by Irving Wallace , before his fame as a bestselling novelist . Hollywood also made several films about the war , Robert Florey ' s " Rogues ' Regiment " ( 1948 ) . Samuel Fuller ' s " China Gate " ( 1957 ) . and James Clavell ' s " Five Gates to Hell " ( 1959 ) . The first French movie about the war , " Shock Patrol " ( " Patrouille de Choc " ) aka " Patrol Without Hope " ( " Patrouille Sans Espoir " ) by Claude Bernard - Aubert , came out in 1956 . The French censor cut some violent scenes and made the director change the end of his movie which was seen as " " too pessismistic " " . Léo Joannon ' s film " Fort du Fou " ( Fort of the Mad ) / " Outpost in Indochina " was released in 1963 . Another film was " The 317th Platoon " ( " La 317ème Section " ) was released in 1964 , it was directed by Indochina War ( and siege of Dien Bien Phu ) veteran Pierre Schoendoerffer . Schoendoerffer has since become a media specialist about the Indochina War and has focused his production on realistic war movies . He was cameraman for the army ( " Cinematographic Service of the Armies " , SCA ) during his duty time , moreover as he had covered the Vietnam War he released " The Anderson Platoon " , which won the Academy Award for Documentary Feature . Graham Greene ' s novel " The Quiet American " takes place during this war . A Vietnamese software developer made a videogame called 7554 after the date of Battle of Dien Bien Phu to commemorate the First Indochina War from the Vietnamese point of view .