In late 1952, an important confrontation between the French and the communist Viet Minh took place in then French Indochina, in a valley transformed into a well-fortified camp. A direct predecessor to the sad 1954 battle of Dien Bien Phu, the confrontation ended with a clear French victory, thanks to a significant role of the French Foreign Legion men.

To learn more about the battle, follow the link:
1952 Battle of Na San