Why did medieval knights wear such heavy armour? How did weapons change after the invention of gunpowder? Which invention killed millions of soldiers in the First World War? This book helps children at Key Stage 2 to discover the answers to these and other fascinating questions. It also recommends sites on the Internet and sources in local libraries where they can find out more about weapons and armour. The detective shows children how to research weapons and armour in their own area, find out how weapons have changed over time and describe a re-enacted battle. Packed with fascinating information, The History Detective Investigates series inspires children's curiosity to find out more about the past.