Vietnam ground combat operations in 1965, and at their peak they numbered more than 500,000. The US also engaged in a sustained aerial bombing campaign. Meanwhile, China and the Soviet Union provided North Vietnam with significant material aid and 15,000 combat advisers. Communist forces supplying the Việt Cộng carried supplies along the Hồ Chí Minh trail, which passed through the Kingdom of Laos. The communists attacked South Vietnamese targets during the 1968 Tết Offensive. Although the campaign failed militarily, it shocked the American establishment, and turned US public opinion against the war. During the offensive, communist troops massacred over 3,000 civilians
1959 in the Vietnam War States Army historian said, "Bolstered by some $190 million a year in American military and economic aid, Diệm enforced at least a degree of governmental authority throughout South Vietnam. His regime resettled the refugees, achieved a measure of economic prosperity, and promulgated what was, on paper, a progressive land reform policy. By means of a series of harsh and indiscriminate but effective anti-Communist 'denunciation' campaigns, Diệm made progress in destroying the remaining Viet Minh organization in the countryside. His troops kept the surviving sect and Communist guerrillas on the run, and his government attempted to establish mass organizations of its