In early March 1972 People's Army of Vietnam (PAVN) forces from the 6th Regiment began attacks on Bastogne and its outposts. The heaviest fighting occurred on 18-19 March when 235 PAVN were killed during fighting at Cu Mong/Hill 640. A total of 513 PAVN and 42 ARVN were killed in two weeks of fighting before the PAVN withdrew to its base areas in the west.[2]
Firebase Bastogne, like most other support bases in Thừa Thiên Province, came under intense fire during the Easter Offensive of 1972. On 9 April a PAVN attack on the base was defeated for the loss of 182 PAVN and nine ARVN, however 14 M113 armored personnel carriers were destroyed in the fighting on Route 547.[3] The ARVN then withdrew the four M107s at the base to Camp Eagle and moved the 54th Regiment's headquarters from the base to Firebase Birmingham, 6km to the east.[4] The PAVN then laid siege to the base and on 11 April lost 102 killed as an ARVN armored column tried for the third day to relieve the base.[5] By 12 April the base was running low on food and ammunition and PAVN fire prevented helicopters from evacuating more than 100 wounded at the base.[4] On 13 April after two B-52 strikes around the base, the ARVN relief force reported finding 210 PAVN dead.[6] On 18 April ARVN relief forces reported approximately 400 PAVN and 21 ARVN killed in fighting 4 miles (6.4 km) east of the base.[7] The PAVN began a renewed attack on the base on 28 April and succeeding in overrunning it on 29 April with the survivors withdrawing east to Firebase Birmingham.[8]
After the capture of Bastogne, other ARVN firebases nearby, including Firebase Birmingham, continued to repel the offensive.[9]: 308 On 14 May a force of over 4,000 ARVN soldiers of the 1st Division launched a counterattack due to the strategic importance of Firebase Bastogne as it was approximately 32km southwest of Huế and within shelling distance.[9]: 311 The base was recaptured by 15 May. On 27 June PAVN forces fired more than 1,000 mortar rounds on ARVN positions 2 miles (3.2 km) southeast of Bastogne, the attack was repulsed for the loss of 60 PAVN and nine ARVN[10] Heavy shelling and repeated ground attacks together with the difficulties of resupply forced the ARVN to abandon Bastogne on 27 July.[9]: 318 [11] On 2 August, preceded by B-52 strikes, the ARVN recaptured Firebase Bastogne, meeting no resistance. In fighting east and north of Bastogne 56 PAVN were reported killed.[12]