'War is a duel written large.' How did we get from clubs and spears to machine guns and drone missiles? What led to the human race firing projectiles across a no-man's-land, from straightforward warfare to spies and insurgency? Here renowned military historian Martin van Creveld has compiled a concise guide to the history of war in 100 key events, from 10,000 BCE to the present day: Stone Age 'war...