-
1956
South Vietnamese President Ngo Dinh Diem begins campaign against political dissidents. -
1957
Beginning of Communist insurgency in the South. -
1959
Weapons and men from North Vietnam begin infiltrating the South. -
1960
American aid to Diem increased -
1962
Number of US military advisors in South Vietnam rises to 12,000 -
1963
Viet Cong, the communist guerrillas operating in South Vietnam, defeat units of the ARVN, the South Vietnamese Army.