[3]: 230  On 18 April following the completion of Operation Pegasus the 26th Marines moved from Khe Sanh Combat Base to Quảng Trị.

This detachment utilized the AN/TPQ-10 Course Directing Radar Central to provide aerial delivered fires in all weather conditions both day and night.

In 1969 the Quang Tri ASRT was operational for 1,526 hours controlling 717 sorties of aircraft and responsible for the employment of 1,754.449 short tons of ordnance.

[4] On 23 April 1969, the base was the scene of one of the first reported Fragging incidents of the war when 1LT Robert T. Rohweller of the 3rd Battalion, 9th Marines was killed by a grenade thrown into his hut.

[9]: 37–8  On the evening of 1 April, the 3rd Division headquarters was moved to a new position inside Quảng Trị City while the remaining U.S. advisers stayed at Ái Tử to coordinate artillery, naval and air support.

An armored task force of 8 M48s and 12 M113s from the ARVN 20th Tank Battalion were despatched from Ái Tử to support the Marines at Pedro.

[9]: 78  At 02:00 on 29 April the PAVN attacked the ARVN positions north and south of the base and the ARVN defenses began to crumble, by midday on 30 April, the 3rd Division commander ordered a withdrawal from Ái Tử to a defensive line along the south of the Thạch Hãn River and the withdrawal was completed late that day.

[9]: 79–80 By August 1972 the area around the base was home to numerous PAVN artillery units which were used to bombard the ARVN defenders in Quảng Trị city.

[9]: 121 In late October the ARVN began attacks north of Quảng Trị to try to regain positions along the south bank of the Cua Viet River.