Vietnam was absorbed into French Indochina in stages between 1858 and 1887. Nationalism grew until World War II provided a break in French control. Early Vietnamese resistance centered on the intellectual Phan Bội Châu. Châu looked to Japan, which had modernized and was one of the few Asian nations to successfully resist European colonization.
The 1881 Haiphong typhoon was a typhoon that struck Haiphong, in Dai Nam (now Vietnam), and the northern part of the Captaincy General of the Philippines (now the Philippines) on October 8, 1881. About 300000 people were killed in and around Haiphong by the typhoon alone (casualties likely went up even in the storm's passing due to disease and starvation).
Due to French pressure, Japan deported Phan Bội Châu to China. Witnessing Sun Yat-sen's Xinhai Revolution, Châu 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.
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.
In March 1945, Japan launched the Second French Indochina Campaign to oust the Vichy French and formally installed Emperor Bảo Đại as head of the nominally independent Empire of Vietnam. The Japanese arrested and imprisoned most of the French officials and military officers remaining in the country.
In April 1945, he met with the OSS agent Archimedes Patti and offered to provide intelligence to the allies provided that he could have "a line of communication with the allie". The OSS agreed to this and later sent a military team of OSS members to train his men and Hồ Chí Minh himself was treated for malaria and dysentery by an OSS doctor.
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.
Following the August Revolution (1945) organized by the Việt Minh, Hồ Chí Minh became Chairman of the Provisional Government (Premier of the Democratic Republic of Vietnam) and issued a Proclamation of Independence of the Democratic Republic of Vietnam.
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.
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.
On 23 September 1945, with the knowledge of the British commander in Saigon, French forces overthrew the local DRV (the Democratic Republic of Vietnam) government, and declared French authority restored in Cochinchina.
In Saigon, with violence between rival Vietnamese factions and French forces increasing, the British commander, General Sir Douglas Gracey, declared martial law. On 24 September, the Việt Minh leaders responded with a call for a general strike.
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.
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.
In the final days of 1946, after a year of diplomatic failure and many concessions in agreements, such as the Dalat and Fontainebleau conferences, the Democratic Republic of Vietnam government found that war was inevitable.
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.
When Chiang forced the French to give the French concessions in Shanghai back to China in exchange for withdrawing from northern Indochina, he had no choice but to sign an agreement with France on 6 March 1946 in which Vietnam would be recognized as an autonomous state in the Indochinese Federation and the French Union. The agreement soon broke down.
On November 23, 1946, the French fleet began a naval bombardment of the Vietnamese sections of Haiphong that killed over 6,000 Vietnamese civilians in one afternoon. The Việt Minh quickly agreed to a cease-fire and left the cities. This is known as the Haiphong incident.
The bombardment of Haiphong by French forces at Hanoi only strengthened the belief that France had no intention of allowing an autonomous, independent state in Vietnam. The bombardment of Haiphong reportedly killed more than 6000 Vietnamese civilians. French forces marched into Hanoi, now the capital city of the Socialist Republic of Vietnam.
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.
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.
By January 1950, Hồ Chí Minh'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.
Military advisors from the People's Republic of China (PRC) began assisting the Viet Minh ((League for the Independence of Vietnam) was a national independence coalition formed at Pác Bó by Hồ Chí Minh on May 19, 1941) in July 1950.
In September 1950, the United States created a Military Assistance and Advisory Group (MAAG) to screen French requests for aid, advise on strategy, and train Vietnamese soldiers. By 1954, the United States had spent US$1 billion in support of the French military effort, shouldering 80 percent of the cost of the war.
On January 13, 1951, Giáp moved the 308th and 312th Divisions, made up of over 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.
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 Phat Diem south of Hanoi.
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.
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.
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.
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.
According to the Pentagon Papers, however, from 1954 to 1956 "Ngô Đình Diệm really did accomplish miracles" in South Vietnam: "It is almost certain that by 1956 the proportion which might have voted for Ho—in a free election against Diệm—would have been much smaller than eighty percent."
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 Battle of Dien Bien Phu occurred 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.
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.
In 1954, after the crushing defeat of French Union forces at Battle of Dien Bien Phu, 2300 French soldiers died during the Battle of Dien Bien Phu more than 10000 french soldiers have surrendered to Vieth Minh. France gave up its fight against the Việt Minh, losing 70,000 soldiers from the eight years of the First Indochina War.
When the French fortress of Dien Bien Phu fell to the Vietnamese Communists in May 1954, Eisenhower refused to intervene despite urgings from the Chairman of the Joint Chiefs, the Vice President and the head of NCS.
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.
The south, meanwhile, constituted the State of Vietnam, with Bảo Đại as Emperor and Ngô Đình Diệm (appointed in July 1954) as his prime minister. Neither the United States government nor Ngô Đình Diệm's State of Vietnam signed anything at the 1954 Geneva Conference.
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 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.
In late 1954, Gen. J. Lawton Collins was made ambassador to "Free Vietnam" (the term South Vietnam came into use in 1955), effectively elevating the country to sovereign status. Collins' instructions were to support the leader Ngo Dinh Diem in subverting communism, by helping him to build an army and wage a military campaign.
In February 1955, Eisenhower dispatched the first American soldiers to Vietnam as military advisors to Diem's army. After Diem announced the formation of the Republic of Vietnam (RVN, commonly known as South Vietnam) in October, Eisenhower immediately recognized the new state and offered military, economic, and technical assistance.
From April to June 1955, Diệm eliminated any political opposition in the south by launching military operations against two religious groups: the Cao Đài and Hòa Hảo of Ba Cụt. The campaign also focused on the Bình Xuyên organized crime group, which was allied with members of the communist party secret police and had some military elements. As broad-based opposition to his harsh tactics mounted, Diệm increasingly sought to blame the communists.
In a referendum on the future of the State of Vietnam on 23 October 1955, Diệm rigged the poll supervised by his brother Ngô Đình Nhu and was credited with 98.2 percent of the vote, including 133% in Saigon. His American advisors had recommended a more modest winning margin of "60 to 70 percent." Diệm, however, viewed the election as a test of authority.
Beginning in the summer of 1955, Diệm launched the "Denounce the Communists" campaign, during which suspected communists and other anti-government elements were arrested, imprisoned, tortured, or executed. He instituted the death penalty against any activity deemed communist in August 1956.
At the end of 1959, conscious that the national election would never be held and that Diem intended to purge opposing forces (mostly ex Việt Minh) from the South Vietnamese government, Hồ Chí Minh informally chose Lê Duẩn to become the next party leader.
To counter the accusation that North Vietnam was violating the Geneva Accord, the independence of the Việt Cộng was stressed in Communist propaganda. North Vietnam created the National Liberation Front of South Vietnam in December 1960 as a "united front", or political branch of the Viet Cong intended to encourage the participation of non-Communists.
The inept performance of the South Vietnamese army was exemplified by failed actions such as the Battle of Ap Bac on 2 January 1963, in which a small band of Viet Cong won a battle against a much larger and better-equipped South Vietnamese force, many of whose officers seemed reluctant even to engage in combat.