The Battle of Dien Bien Phu (Vietnamese: Chiến dịch Điện Biên Phủ) was the climactic confrontation of the First Indochina War between the French Union's French Far East Expeditionary Corps and Viet Minh communist revolutionaries. The battle occurred between March and May 1954 and culminated in a comprehensive French defeat. Shortly after the battle, the war ended with the 1954 Geneva Accords, under which France agreed to withdraw from its former Indochinese colonies. The accords partitioned Vietnam in two; fighting later broke out between opposing Vietnamese factions in 1959, resulting in the Vietnam (Second Indochina) War. Military historian Martin Windrow wrote that Điện Biên Phủ was "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."