A look at how Germany and Russia planned to fight the Great War.

A survey of the most important reasons why the Great War happened and why the international order failed to prevent it.

Germany mobilizes and declares war on Russia and France. As German troops move into Luxembourg and Belgium, the British Cabinet comes around and joins the war.

Russia finds the Austrian ultimatum unacceptable. Austria, egged on by Germany, pursues war with Serbia anyway.

In the four weeks following the assassination of Archduke Ferdinand, the Austrian government slowly pondered its response. Meanwhile, in the rest of Europe, the murders were already being forgotten.

In the final days of peace, many European leaders were preoccupied with domestic problems as others debated whether war was inevitable, or obsolete.

Despite warnings of possible violence, the Austrian Crown Prince travels to Bosnia to observe military maneuvers. During a visit to Sarajevo, he and his wife are assassinated.

In 1914, with victory against the Turks secured, Serb nationalist extremists look north toward Austria.

The airplane means that the English Channel may no longer be all the defense Britain needs. Women's suffrage and Irish Home Rule remain contentious issues in British politics.

Just weeks after the First Balkan War ended, the Second Balkan War broke out over the spoils. When it was over, Serbia was Russia's only remaining diplomatic asset in the Balkans, and was spoiling for a fight with Austria.