The Paris Peace Accords, officially the Agreement on ending the war and restoring peace in Viet-Nam, was a peace agreement signed on 27 January 1973 to establish peace in Vietnam and end the Vietnam War. It included a main treaty and accompanying annexes. It was scheduled to take effect at 8:00 AM Saigon time the following day. The agreement was signed by the Democratic Republic of Vietnam, the Republic of Vietnam, the Provisional Revolutionary Government (PRG), and the United States. The PRG represented the Viet Cong, a South Vietnamese opposition movement de facto controlled by the North. US ground forces had begun to withdraw from Vietnam in 1969, and had suffered from deteriorating morale during the withdrawal. By the beginning of 1972 those that remained had very little involvement in combat. The last American infantry battalions withdrew in August 1972. Most air and naval forces, and most advisers, also were gone from South Vietnam by that time, though air and naval forces not based in South Vietnam were still playing a large role in the war.