"To End All Wars: A Story of Loyalty and Rebellion, 1914-1918" (Houghton Mifflin Harcourt), by Adam Hochschild: Even today, people are killed in northern France by unexploded shells left over from the 700 million artillery and mortar rounds fired on the Western Front during World War I. The fighting between 1914 and 1918 left at least 8.5 million soldiers dead worldwide, including half of all Frenchmen ages 20 to 32, and more than 21 million wounded.