First Indochina War

Japanese troops lay down their arms to British troops in a ceremony in Saigon after the surrender of Japan.

An armistice was signed between Japan and the United States on August 20, 1945. 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.

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 French government official Jean Sainteny.[74] The Imperial Japanese Army, being the only force capable of maintaining law and order, remained in power while keeping French colonial troops and Sainteny detained.[75]

Japanese forces allowed the Việt Minh and other nationalist groups to take over public buildings and weapons without resistance, which began the August Revolution. On August 25, Hồ Chí Minh was able to persuade Emperor Bảo Đại to abdicate. Bảo Đại was appointed "supreme advisor" to the new Việt Minh-led government in Hanoi.

Commander of the C.L.I. (Corps Léger d'Intervention) arriving in Indochina.

On September 2, aboard USS Missouri in Tokyo Bay, CEFEO Expeditionary Corps leader General Leclerc signed the armistice with Japan on behalf of France. The same day, Hồ Chí Minh declared Vietnam's independence from France. Deliberately borrowing from the Declaration of Independence of the United States of America, Hồ Chí Minh proclaimed:

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.[76]

After their surrender, the Japanese Army gave weapons to the Việt Minh. 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 Hồ Chí Minh and other Việt Minh officers during this period.[77] The Việt Minh recruited more than 600 Japanese soldiers and gave them roles to train or command Vietnamese soldiers.[78][79]

On September 13, 1945, 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.[80] Allied troops in Saigon were an airborne detachment, two British companies of the Indian 20th Infantry 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.[81]

Telegram from Hồ Chí Minh to U.S. President Harry S. Truman requesting support for independence (Hanoi, February 28, 1946)

Almost immediately afterward, as agreed to at the Potsdam Conference (and under Supreme Commander for the Allied Powers' "General Order no. One"[82][83]), 200,000 troops of the Chinese 1st Army occupied Indochina as far south as the 16th parallel. They had been sent by Chiang Kai-shek under General Lu Han to accept the surrender of Japanese forces occupying that area, then to supervise the disarming and repatriation of the Japanese Army. This effectively ended Hồ Chí Minh's nominal government in Hanoi. Initially, the Chinese kept the French Colonial soldiers interned, with the acquiescence of the Americans.[75] The Chinese used the VNQDĐ, the Vietnamese branch of the Chinese Kuomintang, to increase their influence in Indochina and put pressure on their opponents.[84]

On October 9, 1945, General Leclerc arrived in Saigon, accompanied by 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 Việt Minh officials.[81]

Chiang Kai-shek threatened the French with war in response to manoeuvering by the French and Hồ Chí Minh against each other, forcing them to come to a peace agreement. In February 1946, he also forced the French to surrender and renounce all of their concessions and ports in China, such as Shanghai, in exchange for withdrawing from northern Indochina and allowing French troops to reoccupy the region starting in March 1946.[85][86][87][88] Following this agreement, VNQDĐ forces became vulnerable due to the withdrawal of Chinese forces and were attacked by Việt Minh and French troops. The Việt Minh massacred thousands of VNQDĐ members and other nationalists in a large-scale purge.[89][90]

General Lu Han's 200,000 Chinese soldiers occupied north Vietnam starting August 1945. 90,000 arrived by October, the 62nd army came on 26 September to Nam Dinh and Haiphong. Lang Son and Cao Bang were occupied by the Guangxi 62nd army corps and the red river region and Lai Cai were occupied by a column from Yunnan. Vietnamese VNQDD fighters accompanied the Chinese soldiers. Ho Chi Minh ordered his DRV administration to set quotas for rice to give to the Chinese soldiers and rice was sold in Chinese currency in the red River delta. Lu Han occupied the French governor general's palace after ejecting the French staff under Sainteny.[91] Chinese soldiers occupied northern Indochina north of the 16th parallel while the British under the South-East Asia Command of Lord Mountbatten occupied the south.[92][93] Chiang Kai-shek deliberately withheld his crack and well trained soldiers from occupying Vietnam since he was going to use them to fight the Communists inside China and instead sent undisciplined warlord troops from Yunnan under Lu Han to occupy north Vietnam and Hanoi north of the 16th parallel to disarm and get Japanese troops to surrender.[94][95] Ho Chi Minh confiscated gold taels, jewelry and coins in September 1945 during "Gold Week" to give to Chinese forces occupying northern Vietnam. Rice to Cochinchina by the French in October 1945 were divided by Ho Chi Minh, and the northern Vietnamese only received one third while the Chinese soldiers were given two thirds by Ho Chi Minh. For 15 days elections were postponed by Ho Chi Minh in response to a demand by Chinese general Chen Xiuhe on 18 December 1945 so that the Chinese could get the Dong Minh Hoi and VNQDD to prepare. The Chinese left only in April–June 1946.[96] Ho Chi Minh gave golden smoking paraphernalia and a golden opium pipe to the Chinese general Lu Han after gold week and purchased weapons with what was left of the proceeds. Starving Vietnamese were dying throughout northern Vietnam in 1945 due to the Japanese seizure of their crops by the time the Chinese came to disarm the Japanese and Vietnamese corpses were all throughout the streets of Hanoi and had to be cleaned up by students.[70] While Chiang Kai-shek, Xiao Wen (Hsiao Wen) and the Kuomintang central government of China was disinterested in occupying Vietnam beyond the allotted time period and involving itself in the war between the Viet Minh and the French, the Yunnan warlord Lu Han held the opposite view and wanted to occupy Vietnam to prevent the French returning and establish a Chinese trusteeship of Vietnam under the principles of the Atlantic Charter with the aim of eventually preparing Vietnam for independence and blocking the French from returning.[97] Ho Chi Minh sent a cable on 17 October 1945 to American President Harry S. Truman calling on him, Generalissimo Chiang Kai-shek, Premier Stalin and Premier Attlee to go to the United Nations against France and demand France not be allowed to return to occupy Vietnam, accusing France of having sold out and cheated the Allies by surrendering Indochina to Japan and that France had no right to return.[98] Ho Chi Minh dumped the blame on Dong Minh Hoi and VNDQQ for signing the agreement with France for returning its soldiers to Vietnam after he had to do it himself.[99][100] Ho Chi Minh's Viet Minh tried to organize welcome parades for Chinese soldiers in northern Vietnam and covered for instances of bad behavior by warlord soldiers, trying to reassure Vietnamese that the warlord troops of Lu Han were only there temporarily and that China supported Vietnam's independence. Viet Minh newspapers said that the same ancestors (huyết thống) and culture were shared by Vietnamese and Chinese and that the Chinese heroically fought Japan and changed in the 1911 revolution and was attacked by western imperialists so it was "not the same as feudal China". Ho Chi Minh forbade his soldiers like Trần Huy Liệu in Phú Thọ from attacking Chinese soldiers and Ho Chi Minh even surrendered Vietnamese who attacked Chinese soldiers to be executed as punishment in the Ro-Nha incident in Kiến An district on 6 March 1946 after Hồ Đức Thành and Đào Văn Biểu, special commissioners sent from Hanoi by Ho's DRV examined the case.[101] Ho Chi Minh appeased and granted numerous concessions to the Chinese soldiers to avoid the possibility of them clashing with the Viet Minh, with him ordering Vietnamese not to carry out anything against Chinese soldiers and pledging his life on his promise, hoping the Chinese would disarm the Japanese soldiers and finish their mission as fast as possible.[102]

Chinese communist guerilla leader Chu Chia-pi came into northern Vietnam multiple times in 1945 and 1948 and helped the Viet Minh fight against the French from Yunnan. Other Chinese Communists also did the same.[103]

In addition to British support, the French also received assistance from various groups that modern historians consider unambiguously Vietnamese. Armed militias from the religious Hòa Hảo sect and the Bình Xuyên organized crime group individually sought power in the country and fought the Việt Minh towards that end.[104][105] Conversely, militias from the Cao Đài sect fought against the French.[106][107]

Vietnamese society also polarized along ethnic lines: the Nung minority assisted the French, while the Tay assisted the Việt Minh.[108]

Hồ Chí Minh and Marius Moutet shaking hands after signing modus vivendi 1946 after Fontainebleau Agreements

In early 1946, the French landed a military force at Haiphong, and negotiations took place about the future for Vietnam as a state within the French Union. Fighting broke out in Haiphong between the Việt Minh government and the French over a conflict of interest in import duty at the port.[109] On November 23, 1946, the French fleet bombarded the Vietnamese sections of the city killing 6,000 Vietnamese civilians in one afternoon.[110][111][112] The Việt Minh quickly agreed to a cease-fire and left the cities. This is known as the Haiphong incident.

There was never any intention among the Vietnamese to give up, as General Võ Nguyên Giáp soon brought up 30,000 men to attack the city. Although the French were outnumbered, their superior weaponry and naval support made any Việt Minh attack unsuccessful. In December, hostilities between the Việt Minh and the French broke out in Hanoi, and Hồ Chí Minh was forced to evacuate the capital in favor of remote forested and mountainous areas. Guerrilla warfare ensued, with the French controlling most of the country except far-flung areas.

In 1947, General Võ Nguyên Giáp retreated with his command to Tan Trao deep in the hills of Tuyên 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 Việt Minh disappeared. Late in the year the French launched Operation Léa to take out the Việt Minh communications center at Bắc Kạn. They failed to capture Hồ Chí Minh and his key lieutenants as intended. The French claimed 9,000 Việt Minh soldiers KIA during the campaign which, if true, would represent a major blow for the insurgency.

In 1948, France started looking for means of opposing the Việt Minh politically, with an alternative government in Saigon. They began negotiations with the former emperor Bảo Đại 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 Bảo Đại as he had freely collaborated with French rule of Vietnam in the past and was in no position to seriously negotiate or impose demands.

French Marine commandos wade ashore off the Annam coast

In 1949, France officially recognized the nominal "independence" of the State of Vietnam as an associated state within the French Union under Bảo Đại. However, France still controlled all foreign relations and every defense issue. The Việt Minh quickly denounced the government and stated that they wanted "real independence, not Bảo Đại independence". Within the framework of the French Union, France also granted independence to the other nations in Indochina, the Kingdoms of Laos and Cambodia.

Later, as a concession to the new government and a way to increase their numbers, France agreed to the formation of the Vietnamese National Army commanded by Vietnamese officers. These troops were used mostly to garrison quiet sectors, so French forces would be available for combat. Private armies from the Cao Đài and Hòa Hảo religious sects and the Bình Xuyên crime syndicate were used in the same way.

With the triumph of the communists in China's civil war, the Vietnamese communists gained a major political ally on their northern border, supporting them with weapons and supplies. 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.

The United States began to give military aid to France in the form of weaponry and military observers.

A map of dissident activities in Indochina in 1950

By January 1950, Ho's government gained recognition from China and the Soviet Union. In the same year, the government of Bảo Đại gained recognition by the United States and the United Kingdom.

In February, Giap seized the vulnerable 150-strong French garrison at Lai Khê in Tonkin just south of the border with China.

In June, the Korean War broke out 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 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 Hồ Chí Minh, in part, because it was supported and supplied by China.

Major General Thái attacked Đông Khê on September 15.[113] Đông Khê fell on September 18.

The Cao Bằng garrison was then evacuated south and, together with the relief force coming from That Khe, were attacked all the way by ambushing Việt Minh forces, which resulted in a stunning French defeat in the Battle of Route Coloniale 4. The French air-dropped a paratroop battalion south of Cao Bằng to act as a diversion only to see it quickly surrounded and destroyed. After that, Lạng Sơn was evacuated in panic while it was not menaced.

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 Hồ Chí 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 Aéronavale).

The military situation improved for France when its 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 Việt 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.

General Trình Minh Thế

On January 13, 1951, Giáp moved the 308th and 312th Divisions, with more than 20,000 men, to attack Vĩnh Yên, 20 miles (32 km) northwest of Hanoi, which was manned by the 6,000-strong 9th Foreign Legion Brigade. The Việt 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 heavily attacked by concentrated French artillery and machine gun fire. By January 16, the Battle of Vĩnh Yên ended as Giáp was forced to withdraw, with over 6,000 of his troops killed, 8,000 wounded and 500 captured.

On March 23, Giáp tried again, launching an attack against Mạo Khê, 20 miles (32 km) 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 withdrew, having lost around 500 troops (by Việt Minh estimation) to over 3,000 (by French estimation) dead and wounded by March 28.

Giáp launched yet another attack, the Battle of the Day River, on May 29 with the 304th Division at Phủ Lý, the 308th Division at Ninh Bình, and the main attack delivered by the 320th Division at Phát Diệm south of Hanoi. The attacks fared no better and the three divisions lost heavily. Taking advantage of this, de Lattre mounted his counteroffensive against the demoralized Việt Minh, driving them back into the jungle and eliminating the enemy pockets in the Red River Delta by June 18, costing the Việt Minh over 10,000 killed.[114]

Every effort by Võ Nguyên Giáp to break the De Lattre Line failed, and every attack he made was answered by a French counter-attack that destroyed his forces. Việt 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 propaganda suicide attack at Sa Đéc in South Vietnam that was blamed on the Việt Minh although it was argued in some quarters that Cao Đài nationalist Trình Minh Thế could have been involved in its planning.

On November 14, 1951, the French seized Hòa Bình, 25 miles (40 km) west of the De Lattre Line, by a parachute drop and extended their perimeter.

In January, General de Lattre fell ill from cancer and returned 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. The Việt Minh launched attacks on Hòa Bình, 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.

French foreign airborne 1st BEP firing with an FM 24/29 light machine gun during an ambush (1952)

Throughout the war theater, the Việt Minh cut French supply lines and wore 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 for larger operations. In the Battle of Nà Sản, starting on October 2, French commanders began using "hedgehog" tactics, consisting in setting up well-defended outposts to get the Việt Minh out of the jungle and force them to fight conventional battles instead of using guerrilla tactics.

On October 17, 1952, Giáp launched attacks against the French garrisons along Nghĩa Lộ, northwest of Hanoi, and overran much of the Black River valley, except for the airfield of Nà Sản where a strong French garrison entrenched. Giáp 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 Giáp to relieve pressure on the Nghĩa Lộ 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 Việt Minh supply dumps at Phú Yên. Salan took Phú Thọ on November 5, and Phu Doan on November 9 by a parachute drop, and finally Phú Yên on November 13. Giáp at first did not react to the French offensive. He planned to wait until their supply lines were overextended and then cut them off from the Red River Delta.

Salan correctly guessed what the Việt 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 Việt 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. The operation was partially successful, proving that the French could strike out at targets outside the De Lattre Line. However, it failed to divert the Việt Minh offensive or seriously damage its logistical network.

A Bearcat naval fighter aircraft of the Aéronavale drops napalm on Việt Minh Division 320th's artillery during Operation Mouette (November 1953)

On April 9, 1953, Giáp, 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. In May, General Henri Navarre replaced Salan as supreme commander of French forces in Indochina. He reported to the French 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 Việt 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 Điện Biên Phủ, located about 10 miles (16 km) north of the Lao border and 175 miles (282 km) west of Hanoi, as a target to block the Việt Minh from invading Laos. Điện Biên Phủ had a number of advantages: it was on a Việt 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 troops, allied with 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 Điện Biên Phủ and sweeping aside the local Việt Minh garrison. The paratroopers gained control of a heart-shaped valley 12 miles (19 km) long and 8 miles (13 km) wide surrounded by heavily wooded hills. Encountering little opposition, the French and Tai units operating from Lai Châu to the north patrolled the hills.

The operation was a tactical success for the French. However, Giáp, seeing the weakness of the French position, started moving most of his forces from the De Lattre Line to Điện Biên Phủ. By mid-December, most of the French and Tai patrols in the hills around the town were wiped out by Việt 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".

Map of the war in 1954: Orange = Areas under Việt Minh control. Purple = Areas under French control. White-dotted hatch = Areas of Việt Minh guerrilla encampment and fighting.

By 1954, despite official propaganda presenting the war as a "crusade against communism",[115][116] the war in Indochina was still growing unpopular with the French public. The political stagnation in the Fourth Republic meant that France was unable to extract itself from the conflict.

The Battle of Dien Bien Phu took place in 1954 between Việt Minh forces under Võ Nguyên Giáp, supported by China and the Soviet Union, and the French Union's French Far East Expeditionary Corps, supported by US financing and Indochinese allies. The battle was fought near the village of Điện Biên Phủ 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 a preemptive Việt 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 Điện Biên Phủ, already difficult to traverse, was also knocked out by Việt Minh forces. With French 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 Việt Minh then began to hammer the outpost with newly supplied Soviet Katyusha rockets and other weaponry provided by communist allies.

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 materiél (weapons, transmissions, etc.) to deny their use to the enemy. A formal order was given to not use the white flag so that the action would be considered a ceasefire instead of a surrender. Much of the fighting ended on May 7; however, the ceasefire was not respected on Isabelle, the isolated southern position, where the battle lasted until May 8, 1:00 am.[117]

Captured French soldiers, escorted by Vietnamese troops, walk to a prisoner-of-war camp in Dien Bien Phu

At least 2,200 members of the 20,000-strong French forces died, and another 1,729 were reported missing after the battle, and 11,721 were captured. 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 Điện Biên Phủ were the greatest number the Việt Minh had ever captured: one-third of the total captured during the entire war.

One month after Điện Biên Phủ, the composite Groupe Mobile 100 (GM100) of the French Union forces evacuated the An Khê outpost and was ambushed by a larger Việt Minh force at the Battle of Mang Yang Pass from June 24 to July 17. At the same time, Giap launched some offensives against the delta, but they all failed. The Việt Minh victory at Điện Biên Phủ 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 other Vietnamese civilians from communist North Vietnamese persecution.

Many former Imperial Japanese Army soldiers fought alongside the Việt Minh—perhaps as many as 5,000 volunteered their services throughout the war. These Japanese had stayed behind in Indochina after World War II concluded in 1945. The occupying British authorities then repatriated most of the rest of the 50,000 Japanese troops back to Japan.[151] For those that stayed behind, supporting the Việt Minh became a more attractive idea than returning to a defeated and occupied homeland. In addition the Việt Minh had very little experience, in warfare or government so the advice of the Japanese was welcome. Some of the Japanese were ex-Kenpeitai who were wanted for questioning by Allied authorities. Giap arranged for them all to receive Vietnamese citizenship and false identification papers.[151] Some Japanese were captured by the Việt Minh during the last months of the World War II and were recruited into their ranks.

Most of the Japanese officers who stayed served as military instructors for the Việt Minh forces, most notably at the Quảng Ngãi Army Academy.[152] They imparted necessary conventional military knowledge - such as how to conduct assaults, night attacks, company/battalion level exercises, commanding, tactics, navigation, communications and movements. A few, however, actively led Vietnamese forces into combat.[152] The French also identified eleven Japanese nurses and two doctors working for the Việt Minh in northern Vietnam in 1951. The Yasukuni Shrine commemorates a number of Japanese involved in the First Indochina War.[153]

Notable Japanese officers serving in Việt Minh included:

• Colonel Mukaiyama - reportedly a staff officer in the 38th Army, who became a technical advisor to the Vietnamese. Credited as the leader of Japanese forces in Vietnam; killed in combat in 1946.
• Colonel Masanobu Tsuji - Operations Staff Officer.[154]
• Major Ishii Takuo - a staff officer in the 55th Division who had commanded a squadron of its cavalry regiment. Supposedly the youngest major in the Imperial Army at the time, he led a number of volunteers to the Vietnamese cause, becoming a colonel and military advisor to General Nguyễn Sơn. He headed the Quảng Ngãi Military Academy for a while before founding the Tuy Hòa Military Academy, and was killed by a land mine in 1950.
• Major Kanetoshi Toshihide - served with Major Igari in the 2nd Division and followed him to join the Việt Minh; he became Chief of Staff for General Nguyễn Giác Ngộ.
• Major Igawa Sei - a staff officer in the 34th Independent Mixed Brigade; he joined the Viet Minh forces, and was killed in action against the French in 1946. He allegedly conceived the idea of establishing the Quảng Ngãi Military Academy.
• Lieutenant Igari Kazumasa - the commander of an infantry company in the 2nd Division's 29th Infantry Regiment; he became an instructor at the Quảng Ngãi Military Academy.
• Lieutenant Kamo Tokuji - a platoon leader under Lieutenant Igari; he also became an instructor at the Quảng Ngãi Military Academy.
• 2nd Lieutenant Tanimoto Kikuo an intelligence officer who was originally supposed to remain behind in Indonesia, but linked up with the 34th Brigade to try to get home, only to end up as an instructor at the Quảng Ngãi Military Academy until 1954.
• 2nd Lieutenant Nakahara Mitsunobu - an intelligence officer of the 34th Independent Mixed Brigade; became a decorated soldier in the Việt Minh forces, and later an instructor at the Quảng Ngãi Military Academy.[155][156][157]

China supplied the Việt Minh with hundreds of Soviet-built GAZ-51 trucks during the 1950s.

One point that the French had a major problem with was the concept of "sanctuary". So long as the anti-colonial revolutionaries who are fighting a guerrilla war have a sanctuary, in which they can hide out, rest and recuperate after losses and store supplies and necessary material, it is almost impossible and highly unlikely for any foreign enemy or foe to ever destroy and defeat them. During the early 1950s guerrilla troops used the southern areas of China, by then under the rule of Chinese communists allied with the anti-French Việt Minh, as a sanctuary. The Việt Minh successfully carried out several hit-and-run ambushes against French Union military convoys along the neighboring Route Coloniale 4 (RC 4) roadway, which was a major supply passage in Tonkin (northern Vietnam). One of the most famous attacks of this nature was the Battle of Cao Bằng of 1947–1949.

China supplied and provided the Việt Minh guerrilla forces with almost every kind of crucial and important supplies and material required, such as food (including thousands of tonnes of rice), money, medics and medical aid and supplies, arms and weapons (ranging from artillery guns (24 of such were used at the Battle of Dien Bien Phu) to rifles and machine-guns), ammunition and explosives and other types of military equipment, including a large part of war-material captured from the then-recently defeated National Revolutionary Army (NRA) of Chiang Kai-shek's Nationalist Chinese government following the end of the Chinese Civil War in 1949. Evidence of the PRC's secret aid and supplies were found hidden in caves during the French military's Operation Hirondelle in July 1953.[158][159] 2,000 military advisors from the PRC and the Soviet Union trained the Việt Minh guerrilla force with the aim of turning it into a full-fledged armed force to fight off their French colonial masters and gain national independence.[122] On top of this, the PRC sent two People's Liberation Army (PLA) artillery battalions to fight at the siege of Dien Bien Phu on May 6, 1954, with one battalion operating the Soviet Katyusha multiple-rocket launcher systems (MRLS) against French forces besieged at Dien Bien Phu's valley.[160]

From 1950 to 1954 the Chinese government shipped goods, materials, and medicine worth $46 billion (in 2021 dollars) to Vietnam. From 1950 to 1956 the Chinese government shipped 155,000 small arms, 58 million rounds of ammunition, 4,630 artillery pieces, 1,080,000 artillery shells, 840,000 hand grenades, 1,400,000 uniforms, 1,200 vehicles, 14,000 tons of food, and 26,000 tons of fuel to Vietnam. Mao Zedong considered it necessary to buttress the Viet Minh to secure his country's southern flank against potential interference by westerners, while the bulk of the PRC's regular military forces participated in the Korean War from 1950 to 1953. After the end of the Korean War and the resolution of the First Taiwan Strait Crisis, China stepped up involvement in the Indochina Wars, viewing the presence of potentially hostile forces in Indochina as the main threat.[161][162]

The Soviet Union was the other major ally of the Việt Minh, alongside the PRC. Moscow supplied GAZ-built trucks, truck engines and motor-parts, fuel, tyres, many different kinds of arms and weapons (including thousands of Škoda-manufactured light machine-guns of Czech origin), all kinds of ammunition (ranging from rifle to machine-gun ammunition), various types of anti-aircraft guns (such as the 37mm air-defense gun) and even cigarettes and tobacco products. During Operation Hirondelle, French Union paratroopers captured and destroyed many tonnes of Soviet-supplied material destined for Việt Minh use in the area of Ky Lua.[158][163] According to General Giap, the chief military leader of all Việt Minh forces, the Việt Minh used about 400 Soviet-produced GAZ-51 trucks at the Battle of Dien Bien Phu. Because the trucks were concealed and hidden with the use of highly effective camouflage (comprised predominantly of thick vegetation), French Union reconnaissance aircraft were not able to notice them and take note of the effective Việt Minh supply-train. On May 6, 1954, during the siege against French forces at the valley of Dien Bien Phu, Soviet-supplied Katyusha MLRS were successfully fielded against French Union military outposts, destroying enemy troop formations and bases and lowering their morale levels. Together with the PRC, the Soviet Union sent up to 2,000 military advisors to provide training to the Việt Minh guerrilla troops and to turn it into a conventional army.[122]

Anti-communist Vietnamese refugees moving from a French LSM landing ship to the USS Montague during Operation Passage to Freedom in 1954

At the beginning of the war, the U.S. was neutral in the conflict because of its opposition to European colonialism, because the Việt Minh had recently been U.S. 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 1949 victory of Mao Zedong's Chinese Communist Party in the Chinese Civil War. By 1949 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.[164]

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 declassified US documents have revealed 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.[165]

In May 1950, after Chinese communist forces occupied Hainan island, 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 of Moscow, with the Soviets ultimately controlling Vietnamese affairs. The prospect of a communist-dominated Southeast Asia spurred the U.S. to support France, with a view to containing the spread of Soviet-allied communism.

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.

As the situation at Dien Bien Phu deteriorated in 1954, France requested more support from the United States, including equipment and direct intervention. For instance, on April 4 French Prime Minister Joseph Laniel and Foreign Minister Georges Bidault conveyed to U.S. Ambassador C. Douglas Dillon that "immediate armed intervention of US carrier aircraft at DienBien Phu is now necessary to save the situation". The United States discussed with allies multiple options, including the use of nuclear weapons. A key concern in the planning was the response of China. While the planning continued, the United States moved an aircraft-carrier task-force, which included the carriers Boxer and Essex, into the South China Sea between the Philippines and Indochina. However, the leadership of the United States eventually decided that there was not sufficient international or domestic support for the United States to become directly involved in the conflict.[166]

Bois Belleau (aka USS Belleau Wood) transferred to France in 1953

USS Windham Bay delivered Grumman F8F Bearcat fighter aircraft to Saigon on January 26, 1951.[167]

On March 2, 1951, the United States Navy transferred USS Agenor (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. USS Sitkoh Bay carrier delivered Grumman F8F Bearcat aircraft to Saigon on March 26, 1951. During September 1953, USS Belleau Wood (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 Hạ Long 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 USS Windham Bay.[168] On April 18, 1954, during the siege of Dien Bien Phu, USS Saipan delivered 25 Korean War AU-1 Corsair aircraft for use by the French Aeronavale in supporting the besieged garrison.

A 1952 F4U-7 Corsair of the 14.F flotilla which fought at Dien Bien Phu

A total of 94 F4U-7s were built for the Aéronavale 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 Aéronavale 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-119s for Operation Castor at Dien Bien Phu. The USAF also provided C-124 Globemasters to transport French paratroop reinforcements to Indochina.

Under the codename Project Swivel Chair,[169] on March 3, 1954, 12 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.[165]

French-marked USAF C-119 flown by CIA pilots over Dien Bien Phu in 1954

Twenty four Central Intelligence Agency (Civil Air Transport) pilots supplied the French Union garrison during the siege of Dien Bien Phu - airlifting paratroopers, ammunition, artillery pieces, tons of barbed wire, medics and other military materiel. With the reducing Drop zone areas, night operations and anti-aircraft artillery assaults, many of the "packets" fell into Việt Minh hands. The 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.[165] On February 25, 2005, the French ambassador to the United States, Jean-David Levitte, awarded the seven remaining CIA pilots the Légion d'honneur.[165]

In August 1954, in support of the French navy and the merchant navy, the U.S. Navy launched Operation Passage to Freedom and sent hundreds of ships, including USS Montague, 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,[170] with around one tenth of that number moving in the opposite direction.

During 1952 and 1954 New Zealand provided from its obsolete and surplus (but serviceable) military stocks a selection of military equipment for the French Forces in Indochina, including:[171]

• 43,000 rifles
• 1,350 machine guns
• 670,000 rounds of small arms ammunition
• 10,000 rounds of 40mm armour-piercing shot
• 500 revolvers
• 50 Bofors anti-aircraft guns and ammunition
• wireless sets
• field telephones
• charging sets
• various uniform items