Book excerpt: [Includes 6 charts, 2 diagrams, 15 maps, and 17 illustrations] This book forms part of the “Vietnam Studies” series produced by various senior commanders who had served in the U.S. Army during the Vietnam War; each officer was chosen for their knowledge of the number of specialized subjects that were covered by the series. This volume of the Vietnam Studies series sees Lt-General Willard Pearson describe the struggles in the Quang Tri and Thua Thien provinces in the far north of Vietnam. Due to their proximity to the North Vietnamese border and the demilitarized zone they saw much fighting and during the years 1966-1968. The provinces were under constant threat and frequent incursions by the Northern Vietnamese forces ensured that American forces had much tough fighting even before the Tet Offensive in 1968 when the camp at Khe Sanh was besieged and the city of Quang Tri overrun. This is a study into some of the toughest fighting that the American troops ever undertook during the whole of their efforts in Vietnam.