 On 27 April heralded by massive artillery attacks with 122mm rockets and 130mm guns, a new PAVN offensive began against South Vietnamese positions all along the Mieu Giang-Cua Viet River defense line.The barrage was quickly followed by violent attacks by PAVN infantry and armor, met by equally determined resistance on the part of the South Vietnamese defenders.The 3rd Squadron, 20th Regiment, supporting the 5th Ranger Group, received the brunt of the attack and was soon heavily engaged.