As well as bravery, leadership and luck, wars have always been decided by technology. This book looks at the weapons, armour and fighting hardware that made the difference in World War I. Twenty signficant vehicles, ships or weapons are described and the specific actions in which they played a decisive part. Combines concise reliable technical specifications with eyewitness accounts and quotes from the people who used the machines. Includes a timeline placing the weapons in the context of war.