In the early morning hours of 31 January 1968, the largest battle of the Vietnam War, the Tet Offensive, was launched by 84,000 PAVN/VC soldiers across South Vietnam. In the Division's area of operation, the PAVN/VC forces seized most of the city of Huế. As the 3rd Brigade, 1st Cavalry Division, fought to cut off PAVN/VC reinforcements pouring into Huế, at Quang Tri City, five battalions, most from the 324th Division, attacked the city and LZ Betty (Headquarters 1st Brigade). To stop allied troops from intervening, three other PAVN/VC infantry battalions deployed as blocking forces, all supported by a 122mm-rocket battalion and two heavy-weapons companies armed with 82mm mortars and 75mm recoilless rifles. After intense fighting, 900 PAVN/VC soldiers were killed in and around Quang Tri City and LZ Betty. However, across South Vietnam, 1,000 Americans, 2,100 South Vietnamese, 14,000 civilians, and 32,000 PAVN/VC were killed.