For 10 points, name this decisive Viet Minh victory at the end of the First Indochina War.
This event's site was chosen by General Naverre and was captured by paratroopers during Operation Castor. During this event, Colonel Piroth committed suicide after failing to counter the initial surprise attack on Beatrice, which was proceeded by the fall of Anne-Marie and Gabrielle. At this battle the defending troops were commanded by Colonel Christian de (*) Castries and it ended the day before the Geneva Accords were signed. After 55 days of fighting, this battle ended when troops under General Giap overran the French fortifications. For 10 points, name this decisive Viet Minh victory at the end of the First Indochina War.
This event's site was chosen by General Naverre and was captured by paratroopers during Operation Castor.
Battle of {Dien Bien Phu}