This book reveals the evolving US, Viet Cong and NVA tactics at battalion level and below throughout the Vietnam War. Beginning with a description of the terrain, climate and the unique nature of operations in this theater of war, author Gordon Rottman, a Vietnam veteran himself, goes on to explain how unit organization was broken down by combatant forces and the impact this had on the kind of tactics they employed. In particular, Rottman highlights how units were organized in reality on the battlefield as opposed to their theoretical tables of organization. US tactics included the standard US tactical doctrine as prescribed by several field manuals and in which leaders and troops were rigorously trained. But it also reveals how many American units developed innovative small unit tactics specifically tailored to the terrain and enemy practices. Key Free World Forces' tactics that will be discussed in detail include Command and Control, Combat Patrols and Ambushes, Counter-Ambushes, Defensive Perimeters, and Offensive Operations (sweeps, search and destroy, clear and secure). In contrast, this book reveals the tactics employed by Viet Cong and NVA units including their own Offensive Operations (attacking bases and installations, attacking moving forces), Reconnaissance, Movement Formations and Security, and Ambushes.