Operation Lam Son 719 (Vietnamese: Chiến ịch Lam Sơn 719 or Chiến dịch đường 9 - Nam Lào) was a limited-objective offensive campaign conducted in southeastern portion of the Kingdom of Laos by the armed forces of the Republic of Vietnam (South Vietnam) between 8 February and 25 March 1971, during the Vietnam War. The United States provided logistical, aerial, and artillery support to the operation, but its ground forces were prohibited by law from entering Laotian territory. The objective of the campaign was the disruption of a possible future offensive by the People's Army of Vietnam (PAVN), whose logistical system within Laos was known as the Ho Chi Minh Trail (the Truong Son Road to North Vietnam).