 This attack was repulsed by a combination of U.S. airpower and the determined stand of ARVN soldiers on the ground.Almost every B-52 in Southeast Asia was called in to strike the massing enemy tanks and infantry.The commander of the defending forces had placed a grid around the town creating many "boxes", each measuring 1 km by 3 km in size, which were given a number and could be called by ground forces at any time.