The Battle of Vĩnh Yên (Vietnamese: Trận Vĩnh Yên) which occurred from 13 to 17 January 1951, was a major engagement in the First Indochina War between the French Union and the Việt Minh. The French Union forces, led by World War II hero Jean de Lattre de Tassigny, inflicted a decisive defeat on the Việt Minh forces, which were commanded by Võ Nguyên Giáp. The victory marked a turn in the tide of the war, which was previously characterized by a number of Việt Minh victories.