-
Germany attacks Verdun. -
Allied forces land at Gallipoli. -
German U-boat sinks the passenger liner Lusitania. -
Austria-Hungary declares war on Serbia. -
Assassination of Archduke Franz Ferdinand of Austria-Hungary in Sarajevo. -
Assassination of Archduke Franz Ferdinand of Austria-Hungary in Sarajevo. -
Major European powers commit to war. -
Germany invades Belgium; the United States declares neutrality. -
First Battle of the Marne.