 PAVN tanks were sighted about 5km southwest of the camp, and the Republic of Vietnam Air Force (RVNAF) began to provide fire support to the defenders.Heavy artillery, rocket, and mortar fire continued, augmented by antiaircraft guns, up to 37 mm, used in direct fire.Contact was also lost with the 4th Company, 78th Rangers, and the two-gun platoon of 105 mm howitzers in the camp had been knocked out of action.