The Battle of Dien Bien Phu (; ) was the climactic confrontation of the First Indochina War between the French Union's French Far East Expeditionary Corps and Viet Minh communist-nationalist revolutionaries. It was, from the French view before the event, a set piece battle to draw out the Vietnamese and destroy them with superior firepower. The battle occurred between March and May 1954 and culminated in a comprehensive French defeat that influenced negotiations over the future of Indochina at Geneva.