On August 13, 1945, the ICP Central Committee held its Ninth Plenum at Tan Trao to prepare an agenda for a National Congress of the Viet Minh a few days later. At the plenum, convened just after the dropping of the atomic bombs on Hiroshima and Nagasaki, an order for a general uprising was issued, and a national insurrection committee was established headed by ICP general secretary Truong Chinh. On August 16, the Viet Minh National Congress convened at Tan Trao and ratified the Central Committee decision to launch a general uprising. The Congress also elected a National Liberation Committee, headed by Ho Chi Minh (who was gravely ill at the time), to serve as a provisional government. The following day, the Congress, at a ceremony in front of the village dinh, officially adopted the national red flag with a gold star, and Ho read an appeal to the Vietnamese people to rise in revolution.
By the end of the first week following the Tan Trao conference, most of the provincial and district capitals north of Hanoi had fallen to the revolutionary forces. When the news of the Japanese surrender reached Hanoi on August 16, the local Japanese military command turned over its powers to the local Vietnamese authorities. By August 17, Viet Minh units in the Hanoi suburbs had deposed the local administrations and seized the government seals symbolizing political authority. Selfdefense units were set up and armed with guns, knives, and sticks. Meanwhile, Viet Minh-led demonstrations broke out inside Hanoi. The following morning, a member of the Viet Minh Municipal Committee announced to a crowd of 200,000 gathered in Ba Dinh Square that the general uprising had begun. The crowd broke up immediately after that and headed for various key buildings around the city, including the palace, city hall, and police headquarters, where they accepted the surrender of the Japanese and local Vietnamese government forces, mostly without resistance. The Viet Minh sent telegrams throughout Tonkin announcing its victory, and local Viet Minh units were able to take over most of the provincial and district capitals without a struggle. In Annam and Cochinchina, however, the Communist victory was less assured because the ICP in those regions had neither the advantage of long, careful preparation nor an established liberated base area and army. Hue fell in a manner similar to Hanoi, with the takeover first of the surrounding area. Saigon fell on August 25 to the Viet Minh, who organized a nine-member, multiparty Committee of the South, including six members of the Viet Minh, to govern the city. The provinces south and west of Saigon, however, remained in the hands of the Hoa Hao. Although the Hoa Hao and Cao Dai were anti-French, both were more interested in regional autonomy than in communist-led national independence. As a result, clashes between the Hoa Hao and the Viet Minh broke out in the Mekong Delta in September.
Ho Chi Minh moved his headquarters to Hanoi shortly after the Viet Minh takeover of the city. On August 28, the Viet Minh announced the formation of the provisional government of the Democratic Republic of Vietnam (DRV) with Ho as president and minister of foreign affairs. Vo Nguyen Giap was named minister of interior and Pham Van Dong minister of finance. In order to broaden support for the new government, several noncommunists were also included. Emperor Bao Dai, whom the communists had forced to abdicate on August 25, was given the position of high counselor to the new government. On September 2, half a million people gathered in Ba Dinh Square to hear Ho read the Vietnamese Declaration of Independence, based on the American Declaration of Independence and the French Declaration of the Rights of Man and the Citizen. After indicting the French colonial record in Vietnam, he closed with an appeal to the victorious Allies to recognize the independence of Vietnam.
Despite the heady days of August, major problems lay ahead for the ICP. Noncommunist political parties, which had been too weak and disorganized to take advantage of the political vacuum left by the fall of the Japanese, began to express opposition to communist control of the new provisional government. Among these parties, the nationalist VNQDD and Viet Nam Phuc Quoc Dong Minh Hoi parties had the benefit of friendship with the Chinese expeditionary forces of Chiang Kai-shek, which began arriving in northern Vietnam in early September. At the Potsdam Conference in July 1945, the Allies had agreed that the Chinese would accept the surrender of the Japanese in Indochina north of the 16°N parallel and the British, south of that line. The Vietnamese nationalists, with the help of Chinese troops, seized some areas north of Hanoi, and the VNQDD subsequently set up an opposition newspaper in Hanoi to denounce "red terror." The communists gave high priority to avoiding clashes with Chinese troops, which soon numbered 180,000. To prevent such encounters, Ho ordered VLA troops to avoid provoking any incidents with the Chinese and agreed to the Chinese demand that the communists negotiate with the Vietnamese nationalist parties. Accordingly, in November 1945, the provisional government began negotiations with the VNQDD and the Viet Nam Phuc Quoc Dong Minh Hoi, both of which initially took a hard line in their demands. The communists resisted, however, and the final agreement called for a provisional coalition government with Ho as president and nationalist leader Nguyen Hai Than as vice president. In the general elections scheduled for early January, 50 of the 350 National Assembly seats were to be reserved for the VNQDD and 20, for Viet Nam Phuc Quoc Dong Minh Hoi, regardless of the results of the balloting.
At the same time, the communists were in a far weaker political position in Cochinchina because they faced competition from the well-organized, economically influential, moderate parties based in Saigon and from the Hoa Hao and Cao Dai in the countryside. Moreover, the commander of the British expeditionary forces, which arrived in early September, was unsympathetic to Vietnamese desires for independence. French troops, released from Japanese prisons and rearmed by the British, provoked incidents and seized control of the city. A general strike called by the Vietnamese led to clashes with the French troops and mob violence in the French sections of the city. Negotiations between the French and the Committee of the South broke down in early October, as French troops began to occupy towns in the Mekong Delta. Plagued by clashes with the religious sects, lack of weapons, and a high desertion rate, the troops of the Viet Minh were driven deep into the delta, forests, and other inaccessible areas of the region.
Meanwhile, in Hanoi candidates supported by the Viet Minh won 300 seats in the National Assembly in the January 1946 elections. In early March, however, the threat of the imminent arrival of French troops in the north forced Ho to negotiate a compromise with France. Under the terms of the agreement, the French government recognized the DRV as a free state with its own army, legislative body, and financial powers, in return for Hanoi's acceptance of a small French military presence in northern Vietnam and membership in the French Union. Both sides agreed to a plebiscite in Cochinchina. The terms of the accord were generally unpopular with the Vietnamese and were widely viewed as a sell-out of the revolution. Ho, however, foresaw grave danger in refusing to compromise while the country was still in a weakened position. Soon after the agreement was signed, some 15,000 French troops arrived in Tonkin, and both the Vietnamese and the French began to question the terms of the accord. Negotiations to implement the agreement began in late spring at Fontainbleau, near Paris, and dragged on throughout the summer. Ho signed a modus vivendi (temporary agreement), which gave the Vietnamese little more than the promise of negotiation of a final treaty the following January, and returned to Vietnam.