intervention which lasted until 1973, when they withdrew their forces from Vietnam following a peace treaty. The war went on, and in 1975 North Vietnam emerged victorious. Cambodian Civil War The Cambodian Civil War was a mixed result of the Khmer Rouge's desire to establish a communist regime in Cambodia, eventually dragging Cambodia into the Vietnam War due to the North Vietnamese support for the Khmer Rouge and their use of Cambodian soil to stage attacks into South Vietnam. The US heavily bombed PVA, VC and Khmer Rouge position in Cambodia. Khmer Rouge was aided militarily by the North Vietnam and the Viet Cong, and won the war in 1975. Hmong Insurgency When the Laotian Civil War ended in 1975, the government of Laos started to persecute the Hmong-tribes, who had been fighting alongside the United States in the Vietnam War. Vietnam has participated in the persecution, which has led to thousands of Hmong fleeing to the United States and Thailand. Although the Hmong no longer poses a military threat to the government of Laos, they are still under suspect by Laotian authorities. Cambodian-Vietnamese War When the Vietnam War ended, the Khmer Rouge, which then controlled Cambodia, claimed the Mekong Delta being a historical part of Cambodia. When Vietnam refused to cede the delta to Cambodia, the Khmer Rouge responded by conducting several border skirmishes, infiltrations and sabotage. By the late 1978, Vietnam invaded Cambodia, and after two weeks of fighting, Vietnamese forces captured Pnomh Penh. Vietnam occupied Cambodia until 1988. Vietnamese border raids in Thailand The Vietnamese border raids in Thailand were a Vietnamese attempt to stop the Khmer Rouge from using Thailand as a base when fighting against Vietnam and the Vietnamese-friendly regime in Pnomh Penh. This nearly led to a war, as Vietnamese troops often penetrated into Thai territory, chasing Khmer Rouge guerrillas. This often resulted in clashes between Vietnamese and Thai forces. However, this never led to a war. Sino-Vietnamese War In response to Vietnam's 1978 invasion and occupation of Cambodia (which ended the rule of the Chinese-backed Khmer Rouge), the People's Republic of China launched a brief punitive military campaign against Vietnam, lasting from 17 February to 16 March. Chinese forces entered northern Vietnam and captured several cities near the border. On 6 March 1979, China declared that the gate to Hanoi was open and that their punitive mission had been achieved, before withdrawing their