All Thai troops from the Royal Thai Army Volunteer Force leave the country. March 30 - October 22, 1972 The Easter Offensive, officially, the Nguyen Hue Offensive and also (Chiến dịch Xuân hè 1972 in Vietnamese) was a military campaign conducted by the People's Army of Vietnam (PAVN, the regular army of North Vietnam) against the Army of the Republic of Vietnam (ARVN, the regular army of South Vietnam) and the United States. March 30-May 1 The First Battle of Quảng Trị resulted in the first major victory for the North Vietnamese Army during the Nguyen Hue Offensive of 1972.