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Franz Ferdinand and wife assassinated
June 28 - Archduke Franz Ferdinand, heir to Austria-Hungary's throne, and his wife, Sophie, are assassinated by Serbian nationalist Gavrilo Princip while the couple were visiting Sarajevo. -
Austria-Hungary declares war
July 28 - Austria-Hungary declares war on Serbia. -
Germany declares war
August 1 - Germany declares war on Russia -
Germany declares war
August 3 - Germany declares war on France. -
United Kingdom declares war
August 4 - The United Kingdom declares war on Germany, after Germany invades Belgium. -
Austria-Hungary declares war on Russia
August 6 - Austria-Hungary declares war on Russia -
August 19 - U.S will remain neutral.
August 19 - U.S. President Woodrow Wilson announces the U.S. will remain neutral. -
Christmas truce declared
December 24 The unofficial Christmas truce is declared. -
Germany declares "War Zone"
February 4 - Germany declares a "war zone" around Great Britain, essentially effecting a submarine blockade where even neutral merchant vessels were to be potential targets. -
Tanks are seen in The Battle of Somme
July 1 - The Battle of the Somme begins. During the Battle of the Somme, tanks are first introduced into battle. -
The United States declares war
April 6 - The United States declares war on Germany. -
Fighting ends
November 11 - Germany signs the armistice at Compiegne, France. Fighting ends on the 11th hour of the 11th day of the 11th month.
