The battle was a strategic victory for the PAVN in that they were able to take control of the A Shau Valley and use it as a base area for the rest of the war.
[1] The valley was strategically important for the PAVN as a major infiltration route because it served as a bridge from the Ho Chi Minh Trail in Laos into populated coastal areas of Thừa Thiên Province.
However, Air Commandos conducting reconnaissance flights observed large build-ups of PAVN troops along with anti-aircraft emplacements.
Because of poor weather conditions that would hinder tactical air and resupply efforts, the PAVN decided to continue despite their heavy casualties.
The second attack began during the early morning hours of March 9 with mortar bombardment, damaging communications and reducing many defensive positions to rubble.
At 1300 hours an AC-47D "Spooky 70" from the 4th Air Commando Squadron, circling the camp, fired on the attacking PAVN formations.
However, reinforcements from Huế and Phu Bai could not be deployed because of the bad weather, leaving the camp's defenders to repair their defensive wall and dig in for the night.
[6][5]: 61 As fighting continued the situation deteriorated as ammunition began running short and the decision was made to evacuate all personnel.
[5]: 61–2 Panic-stricken South Vietnamese soldiers and civilians mobbed the evacuation helicopters and overwhelmed U.S. Special Forces troops as they abandoned the camp.
[5]: 149–50 The PAVN transformed the A Shau Valley into a heavily fortified base area with bunkers, antiaircraft guns, and artillery.
During the Tet Offensive the A Shau Valley provided Communist troops an important sanctuary from which to launch attacks at South Vietnamese cities and military bases, especially Huế and Phu Bai.