conduct of all of the parties for the remainder of the Second Indochina War. In 1959, North Vietnam had already established a supply line through "neutral" Laotian territory to supply the Viet Cong insurgency against South Vietnam. The communists called the supply line the "Trường Sơn Strategic Supply Route (Đường Trường Sơn)." The Pathet Lao and the North Vietnamese continued to use and to improve the supply route, which would become known as the Ho Chi Minh Trail. More specifically, during the Second Indochina War, the North Vietnamese obtained the co-operation of the Pathet Lao to construct and maintain the Ho Chi Minh Trail, which passed throughout the length of Laos. Thousands of Vietnamese troops were stationed in Laos to maintain the road network and to provide for its security. Vietnamese military personnel also fought beside the Pathet Lao in its struggle to overthrow the neutralist government of Laos. The co-operation persisted after the war and the communist victory in Laos. References External links Declaration on the Neutrality of Laos. Signed at Geneva, on 23 July 1962 1962 in Laos Treaties concluded in 1962 Treaties entered into force in 1962 Treaties of the Kingdom of Laos Treaties of the Soviet Union Treaties of Myanmar Treaties of the Kingdom of Cambodia (1953–1970) Treaties of Canada Treaties of the People's Republic of China Treaties of Thailand Treaties of the United Kingdom Treaties of the United States Treaties of France Treaties of the Polish People's Republic Treaties of North Vietnam Treaties of South Vietnam Treaties of India Laos–United States relations