To mark the 70th anniversary of the Battle of Dien Bien Phu, which put an end to the Indochina War, this documentary looks back at this little-known French war, thanks to the recent opening of declassified archives. The Indochina War was the most violent decolonization war of the 20th century. From 1940 to 1954, the pearl of the French colonial empire went up in flames.