"Over There: 101 Keys to Understanding the First World War," written by master history teacher Brian Hurd, features descriptions of 101 essential events, people, places, and concepts of the First World War. The text is copiously illustrated with pictures and maps. In then chapters, Hurd takes readers young and old through the "keys" to understanding the "Great War," from setting the stage for war, through the initial invasion of Belgium and eventual trench warfare, to the entry of the US into the war, the Russian revolution, the introduction of new war technologies, and the eventual armistice and aftermath.