In Cambodia, communist fighters renew their assaults on government positions, forcing the retreat of Cambodian government forces from Kompong Thmar and nearby Ba Ray, six miles northeast of Phnom Penh.
Premier Lon Nol and his troops had been locked in a desperate battle with the communist Khmer Rouge and their North Vietnamese allies for control of Cambodia since 1970, when Nol had taken over the government from Prince Norodom Sihanouk. The communist forces had just launched a major offensive and the government troops were reeling under the new attacks.
By December 2, the North Vietnamese overran Cambodian forces trying to protect Route 6, one of the key road links between Phnom Penh and the interior. The communists gained control of a 30-mile stretch of Route 6, cutting off thousands of refugees and nearly 10,000 government troops in the northern Kompong Thmar area.
On December 6, Hanoi radio reported that the Cambodian government had lost 12,000 fighting men in the past week's action. The next day, communist gunners renewed their shelling of Phnom Penh, firing three rockets into the capital and eight rockets into the international airport. As the rockets fell, the Communists troops attacked government positions all around the city and by December 11, Lon Nol's forces were in imminent danger of being encircled by the Khmer Rouge, as the communists tried to isolate Phnom Penh from the rest of the country and outside support. With most of the government forces tied down and fighting for their lives, the North Vietnamese were free to use their sanctuaries and resupply routes in Cambodia to begin building up for a major offensive they were planning in South Vietnam for the spring of 1972.