World War I completely changed how wars were fought. It was the first major conflict to use planes, tanks, and certain kinds of chemical weapons. Readers expand their knowledge of "the war to end all wars" with this high-interest look at the technology that made an Allied victory possible. As readers learn impressive facts about various pieces of military technology, they enhance their understanding of social studies and STEM topics. Fact boxes and sidebars are presented alongside the informative main text, and detailed historical photographs allow readers to visualize the amazing machines they're learning about.