Francis Ferdinand assassinated at Sarajevo by Serbians
June 28, 1914
Kaiser William II promised German support for Austria against Serbia
July 5, 1914
Germany declares war on Russia.
August 1 1914
Germany declares war on France.
August 3 1914
The United Kingdom declares war on Germany, after Germany invades Belgium.
August 4 1914
Austria-Hungary declares war on Russia and Serbia declares war on Germany.
August 6 1914
U.S. President Woodrow Wilson announces the U.S. will remain neutral.
August 19 1914
First Battle of the Marne begins - trench warfare soldiers on both sides dig in.
September 5 1914
Britain said that North Sea is military area = blockade of goods into Germany
November 3, 1914
Germany declares "war zone" around Britain, effecting submarine blockade
February 4 1915
Second Battle of Ypres begins - Germans first use poison gas.
April 22 1915
British ocean liner RMS Lusitania is sunk by German U-boat, U-20
May 7 1915
Tsar Nicholas II takes personal control over Russia's armies.
September 5, 1915
The Battle of Verdun begins- longest and one of bloodiest battles
February 21, 1916
The Battle of Jutland, the major naval battle
May 31 1916
The Battle of the Somme, tanks are first introduced into battle.
July 1 1916
Russian Revolutions - toppled monarchy
Germany sends the secret Zimmerman Telegram to Mexico, U.S. intercepts it.
January 19, 1917
Russian Tsar Nicholas II abdicates.
March 15, 1917
The United States declares war on Germany.
April 6, 1917
The Bolsheviks successfully overthrow the Russian government.
November 7, 1917
Armistice agreed upon between new Russian gov. and Central Powers effective
December 17, 1917
Civil War in Russia
1918 - 1921
Russia signs Treaty of Brest Litovsk - peace treaty with the Central Powers.
March 3 1918
German flying ace, Baron Manfred von Richthofen - Red Baron - shot down.
April 21, 1918
German Kaiser Wilhelm II abdicates and flees Germany.
November 9 1918
Germany signs the armistice at Compiegne, France - fighting ends
November 11, 1918
The Treaty of St. Germain - Between Austria and Allied powers
The Treaty of Versailles officially ends WWI.
June 28, 1919
The Treaty of Sèvres - abolished Ottoman Empire
August 10, 1920