War Posters

World War I in Photos: Introduction A century ago, an assassin, a Serbian nationalist, killed the heir to the throne of Austria-Hungary as he visited Sarajevo. This act was the catalyst for a massive conflict that lasted four years. More than 65 million soldiers were mobilized by more than 30 nations, with battles taking place around the world. Industrialization brought modern weapons, machinery, and tactics to warfare, vastly increasing the killing power of armies. A century ago, an assassin, a Serbian nationalist, killed the heir to the throne of Austria-Hungary as he visited Sarajevo.