On June 28, 1914, an assassin's bullet set off a chain of events that would lead to the most terrible war the world had ever seen. This was the day Archduke Ferdinand, heir to the throne of Austria-Hungary, made a state visit to Sarajevo, the capital city of Bosnia. At the time, the Great Powers of Europe were heavily armed and ready for battle. When Gavrilo Princip stepped up to the archduke's car and fired two bullets, it lit the spark that would...