to continue to occupy those regions of South Vietnam they had conquered in the 1972 Easter Offensive. The North Vietnamese never intended to abide by the agreement. Fighting continued sporadically through 1973 and 1974, while the North Vietnamese planned a major offensive, tentatively scheduled for 1976. The North Vietnamese Army in South Vietnam had been ravaged during the Easter offensive in 1973, and it was projected that it would take until 1976 to rebuild their logistical capabilities. The withdrawal had catastrophic effects on the South Vietnamese Army (ARVN). Shortly after the Paris Peace Accords, the United States Congress made major budget cuts in military aid to the South Vietnamese. The ARVN, which had been trained by American troops to use American tactics, quickly fell into disarray. Although it remained an effective fighting force throughout 1973 and 1974, by January 1975 it had disintegrated. The North Vietnamese hurriedly attacked the much weakened South, and were met with little resistance. Saigon, the capital of South Vietnam, was taken by the PAVN on April 30, 1975, and the Second Indochina War ended. The fighting that took place between North and South Vietnam following United States withdrawal is sometimes called the Third Indochina War; this term usually refers to a later 1979 conflict, however (see below). Third Indochina War The Third Indochina War, commonly known as the Cambodian–Vietnamese War, started on 1 May 1975 when the Kampuchean Revolutionary Army invaded the Vietnamese island of Phu Quoc. Vietnamese forces quickly counter-attacked, regaining their territory and invading the Kampuchean island of Koh Wai. In August 1975, Vietnam returned the island of Koh Wai to Kampuchea and both governments started making peaceful noises, but behind the scenes tensions were mounting. On 30 April 1977, Kampuchea started attacking Vietnamese villages. In September, six divisions crossed the border, advancing 10 kilometers (6.2 mi) into Tay Ninh Province. Angered by the scale of the attacks, the Vietnam People’s Army assembled eight divisions to launch a retaliatory strike against Kampuchea. In December, in an effort to force the Kampuchean government to negotiate, the Vietnamese forces invaded Kampuchea, easily defeating the Kampuchean army. On 6 January 1978, Vietnamese forces were only 38 kilometers (24 mi) from Phnom Penh; however, the Kampuchean government remained defiant and the Vietnamese leadership realised they would not secure their political objective and decided to withdraw their troops. As Kampuchean forces soon resumed their attacks across the border,