After firing more than 5,000 rockets, artillery, and mortar shells on 12 South Vietnamese positions just below the Demilitarized Zone, the North Vietnamese Army launches ground assaults against South Vietnamese positions in Quang Tri Province. The attacks were thrown back, with 87 North Vietnamese killed. South Vietnamese fire bases Fuller, Mai Loc, Holcomb, Pioneer, and two smaller bases near the Demilitarized Zone were abandoned as the North Vietnamese pushed the defenders back toward their rear bases. At the same time, attacks against three bases west of Saigon forced the South Vietnamese to abandon six outposts along the Cambodian border.
These were a continuation of the opening attacks of the North Vietnamese Nguyen Hue Offensive, a major coordinated communist offensive initiated on March 30. Committing almost their entire army to the offensive, the North Vietnamese launched a massive three-pronged attack. In the initial attack, four North Vietnamese divisions attacked directly across the Demilitarized Zone into Quang Tri province. Following the assault in Quang Tri province, the North Vietnamese launched two more major attacks: at An Loc in Binh Long Province, 60 miles north of Saigon, and at Kontum in the Central Highlands. With the three attacks, the North Vietnamese had committed 500 tanks and 150,000 regular troops (as well as thousands of Viet Cong) supported by heavy rocket and artillery fire.
After initial successes, especially against the newly formed South Vietnamese 3rd Division in Quang Tri, the North Vietnamese attack was stopped cold by the combination of defending South Vietnamese divisions (along with their U.S. advisers) and massive American airpower. Estimates placed the North Vietnamese losses at more than 100,000 and at least one-half of their tanks and large caliber artillery.