 Following this visit two more cavalry battalions (1st Battalion, 7th Cavalry Regiment and 2nd Battalion, 501st Infantry Regiment) and additional air and artillery support were committed to the attack on La Chu.On 21 February following intensive radar-guided airstrikes and artillery strikes, the four Cavalry battalions launched a four-pronged attack from the north, west and south on Que Chu and La Chu.The PAVN strongly defended the perimeter, but once the Cavalry forces broke through with the support of two newly arrived M42 Dusters, they found that the base had been largely abandoned while the Cavalry had been building up their forces for the attack.