sentences:  Naval gunfire and a B-52 strike were soon directed at PAVN forces gathered on the northern bank.On 2 April, after several days of shelling and surrounded by a PAVN regiment Colonel Pham Van Dinh, commander of the 56th Regiment, surrendered Camp Caroll and his 1,500 troops with barely a shot being fired.With the loss of Camp Carroll the 147th Marine Brigade abandoned Mai Loc, the last western base and fell back to Quang Tri and then to Huế, the brigade was replaced by the fresh 369th Marine Brigade which established a new defensive line at Firebase Nancy.