The Vietnamese nationalists in 1954 decisively defeated the French at the battle of AP World History Chapter 35 The Vietnamese nationalists in 1954 decisively defeated the French at the battle of a. Qang Diep. b. Dien Bien Phu. c. Danang. d. Hue. e. Hanoi. Answer: B Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+