5 April, marked the beginning of Operation Pegasus; the battalion and other 1st Cavalry elements came to the relief of the Marines at beleaguered Khe Sanh Combat Base. After successful operations, the battalion moved on to their biggest operation for the year. On 23 April 1968 1st Battalion, 8th Cavalry began Operation Delaware in which it air-assaulted into and constructed LZ Stallion in the A Shau Valley. Within two days after its arrival 1st Battalion captured the largest cache accredited to the 1st Brigade since its arrival in the Republic of Vietnam, Company D captured 5 1½-ton trucks, crew-served weapons, mine detectors, flame throwers, 135 cases of 37-mm ammunition, 35 cases of black uniforms, 440 AK-47 rifles, large drums of diesel fuel, explosives and food supplies. With the close of Operation Delaware and the start of Operation Jeb Stuart III, the 1st Battalion, 8th Cavalry returned to operating in Quang Tri Province, in the general vicinity of Quang Tri City. Immediately after its return the battalion made contact with the enemy. On 18 May 1968 the night perimeter of Company B was attacked by PAVN soldiers. The result of this encounter was twelve PAVN killed, one POW, 10 grenades, and 10 small arms weapons captured. For the remainder of the months of May, June and July contact was light and scattered.