[2]: 474  In late April following the heavy losses in the previous month's fighting, General Giáp ordered the Division's 9th Regiment to Điện Biên Phủ as reinforcements.

In December 1967, US Intelligence reported that the division had crossed over from Laos and had taken up positions southwest of Khe Sanh Combat Base.

[4]: 106 At dawn on 21 January the Division's 66th Regiment attacked Khe Sanh village, seat of Hướng Hóa District.

[4]: 109–10 On the night of 29 February, the 9th Regiment of the division launched 3 attacks on the eastern perimeter of the Combat Base, but were beaten back each time by US firepower.

"[7]: 108  The diary of one PAVN soldier killed in the battle reflected that while moving southward under the pressure of U.S. air power to replace casualties in the division, 300 men had deserted rather than face the feared B-52.

In late February a company of the ARVN 3rd Airborne Battalion operating south of Fire Support Base 31 (16°42′54″N 106°25′34″E / 16.715°N 106.426°E / 16.715; 106.426) received a Chieu Hoi, a sergeant from the Division's 24B Regiment.

At this time a United States Air Force F-4 Phantom jet was shot down in the area and the Forward air control (FAC) aircraft coordinating fire support for FSB 31 left the area of the battle to direct a rescue effort for the downed aircraft crew.

[9]: 84–5  By the 19 March the 24B Regiment was operating east of Ban Dong/A Luoi (16°38′06″N 106°25′48″E / 16.635°N 106.430°E / 16.635; 106.430) in an attempt to prevent ARVN withdrawal along Route 9.

[5]: 291  Also on the 2nd the Division's 66th Regiment began attacking 14th Marine Brigade at Mai Loc Camp forcing their withdrawal.

At 02:00 on 29 April the division 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.

[12]: 154 From 27–28 April the division fought the 468th Marine Brigade supported by the 318th Armored Regiment for control of Nuoc Trong.