Now heavily reinforced, the Australian and American artillery and mortars quickly responded with heavy counter-battery fire, with a total of 60 guns from three batteries of 105 mm field guns, one battery of 155 mm howitzers, one 8 inches battery and nine 81 mm mortars firing in support, augmented by air support from three heavy fire teams (each of three UH-1 helicopter gunships) and three fighter-bombers with bombs and napalm.