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Lieutenant Colonel Langlais assumes effective control of the French garrison at Dien Bien Phu, a biography of him.  The Viet Minh attack the eastern defences of the French base, most of which are successful but some French defensive positions do fight the Viet Minh off.  The Isabelle position, south of the main base is cut off by the Viet Minh.  However the Viet Minh do suffer heavy losses during this battles.