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June 28, 1914
Assassination of Archduke Franz Ferdinand -
July 28, 1914
Austria-Hungary declares war on Serbia which starts the First World War -
August 1, 1914
Germany declares war on Russia -
August 3, 1914
Germany declares war on France -
August 7, 1914
The first British troops land in France. -
August 12, 1914
Great Britain and France declare war on Austria-Hungary. -
August 23, 1914
First contact since Battle of Waterloo -
November 1, 1914
German-British naval battle at Coronel, Chile -
February 4, 1915
Germany declared the waters about the British Isles a "war zone" in which submarines would destroy enemy vessels. -
April 24,1915
The Armenian genocide began. The Turkish government arrested and executed several hundred Armenian intellectuals. -
April 26, 1915
Italy signs the Treaty of London, committing itself to enter World War I on the side of the Allies. -
May 7, 1915
The British ocean liner Lusitania is torpedoed without warning by a German submarine off the south coast of Ireland. 1,198 people were killed. -
July 1, 1916
British soldiers began an attack against a German trench line which was supposed to have been destroyed. 29,000 people were killed and many more wounded. -
November 21, 1916
HMHS Britannic sinks in the Aegean Sea after a mine explodes, killing 30 people -
January 9, 1917
The Battle of Rafa occurs near the Egyptian border with Palestine. -
March 3, 1917
German Foreign Secretary Arthur Zimmermann publicly admits the "Zimmermann Telegram" is genuine. Generates support for the US declaration of war on Germany in April.
