In the spring of 1968, after the Tet Offensive and before the opening of the Paris peace talks, the North Vietnamese Army (NVA) and Vietcong made a determined effort to improve their bargaining position. They conducted 119 attacks on provincial and district capitals, military installations, and major cities in South Vietnam. The United States Marines maintained a supply base at Dong Ha in I Corps. It was in the northeastern area of Quang Tri Province. Late in April and early in May, the NVA 320th Division, with 8,000 troops, attacked Dong Ha and fought a rigorous battle against an allied force of 5,000 marines and South Vietnamese soldiers. The North Vietnamese failed to destroy the supply base and had to retreat back across the Demilitarized Zone (DMZ), leaving behind 856 dead. Sixty-eight Americans died in the fighting.