Dien Bien Phu (Điện Biên Phủ) is a town in northwestern Vietnam. It is the capital of Dien Bien province, and is known for the events there during the First Indochina War, the Battle of Dien Bien Phu, during which the region was a breadbasket for the Viet Minh.  

In the 1950s, the town was known not only for its famous opium traffic, generating 500,000,000 French Francs per year, but more so for a fierce battle that would result in a major realignment of world geopolitics. It was also an extensive source of rice for the Viet Minh

The region was fortified in November 1953 by the French Union force in the biggest airborne operation of the 1946-1954 First Indochina War, Operation Castor, to block Viet Minh transport routes and to set the stage to draw out Việt Minh forces.

The following year, the important Battle of Dien Bien Phu was fought between the Việt Minh (led by Vo Nguyen Giap), and the United States-backed French Union (led by General Navarre, successor to General Raoul Salan). The siege of the French garrison lasted fifty-seven days, from 5:30PM on March 13 to 5:30PM on May 7, 1954. The southern outpost or fire base of the camp, Isabelle, did not follow the cease-fire order and fought until the next day at 01:00AM; a few hours before the long-scheduled Geneva Meeting's Indochina conference involving the United States, the United Kingdom, the French Union and the Soviet Union.

The battle was significant beyond the valleys of Dien Bien Phu. Vo Nguyen Giap's victory ended major French involvement in Indochina and led to the accords which partitioned Vietnam into North and South. Eventually, these conditions inspired American involvement in the Vietnam War. The battle of Điện Biên Phủ is described by historians as "the first time that a non-European colonial independence movement had evolved through all the stages from guerrilla bands to a conventionally organized and equipped army able to defeat a modern Western occupier in pitched battle."