Since 1950, the war in Indochina entered a fierce phase, especially in Tonkin (Vietnam). Viet Minh forces, supported by China and the Soviet Union, cornered the French expeditionary army and lost many important bases on the battlefield. That is why the US has increased its support for the French army in the war and at the same time trusted a very talented General of the French army, General Jean de Lattre de Tassigny. Jean de Lattre de Tassigny went to Indochina to implement a strategy to reverse the situation of the French army with a series of effective military policies. The strategies of General Jean de Lattre de Tassigny caused many difficulties for the Viet Minh and the Indochina battlefield also had great changes. However, as his strategies were being implemented, he died in 1952 and the French army lost a man capable of turning the tide. The rise of the Viet Minh and the strength of the Vietnamese patriotism completely defeated the French army in 1954. This article refers to General Jean de Lattre de Tassigny's strategy in Tonkin (Vietnam) battlefield, thereby clarifying his military policies in the first Indochina war.