Vietnam War marked a tragic period in U.S. history.High-interest topics, real stories, engaging design and astonishing photos are the building blocks of the XBooks, a new series of books designed to engage and motivate reluctant and enthusiastic readers alike. With topics based in science, history, and social studies, these action-packed books will help students unlock the power and pleasure of reading... and always ask for more!This is the story of one man who lost a friend and a leader in a massacre known as Hamburger Hill.