 To stop the onslaught, U.S. fighter-bombers were called in to strafe PAVN and VC formations, while U.S. soldiers on the ground used small arms and artillery fire to break up the attack at point-blank range.A U.S. Army UH-1 Huey and an O-2 Skymaster were shot down while circling the compound.By the time the first attack was stopped, the opposite end of the compound also came under fire, and by early morning tactical air-support became difficult, as PAVN troops were in close proximity with U.S. and allied forces.