First Indochina War
French defeat at Dien Bien Phu, end of the war (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 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. 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. 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 matériel (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. 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. The Viet Minh suffered approximately 25,000 casualties over the course of the battle, with as many as 10,000 Viet Minh personnel having been killed in the battle. Such a high amount of losses has led some historians to classify the Viet Minh's triumph as a pyrrhic victory and has been attributed as a factor motivating the Viet Minh's leadership to enter peace negotiations with France shortly thereafter. 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 on June 24, and again at the Battle of Chu Dreh Pass July 17. 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.
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