The 56th Regiment was taking over Camp Carroll, Firebase Khe Gio and Firebase Fuller from the 2nd Regiment. The 57th Regiment was taking over the area from Đông Hà Combat Base north to the DMZ and east to the coast. The 2nd Regiment was taking over the combat bases north of Cam Lộ Combat Base.[1]: 23–4 The two Regiments were intermingled on Route 9 and out of radio contact with Division headquarters when the PAVN began their offensive.[2]: 130