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With Beijing's promise of limited assistance to Hanoi, the communist The Communist military strategy concetrated on the liberation of Tonkin and concined Cochinchina to a lower priority. The top military priority, as set by Giap, was to free the northern border areas in order to protect the movement of supplies and personnel from China. By Autumn of 1950, the Viet Minh had again liberated the Viet bac in decisive battles that forced the French to evacuate the entire border region, leaving hehind a large quantity of ammunition . From their liberated zone in the northern border area, the Viet Minh were free to make raids into the Red River Delta. The French military in Vietnem found it increasingly difficult to convince Paris and the French electorates to give them the man power and material needed to defeat the Viet Minh. For the next two years, the Viet Minh, well aware of the growing disillusionment of the French people with IndoChina, concentrated its efforts on wearing down the French military by attacking its weakests outpostsand by maximizing the physical distance between engagements to disperse the French forces. Being able to choose the time and place for such engagements gave the guerrillas a decided advantage. Meanwhile, political activity was increased until by late 1952, more than half the villages of the Red River Deltawere under Viet Minh control.