On what date did XXX end?
Battle of Vĩnh Yên
The Battle of Vĩnh Yên (Vietnamese: Trận Vĩnh Yên), also called Tran Hung Dao Campaign by Vietminh, 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.
17 January 1951