• assassination of archduke and wife

    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.
  • declare war

    Austria-Hungary declares war on Russia and Serbia declares war on Germany.
  • United States remains nuetral

    U.S. President Woodrow Wilson announces the U.S. will remain neutral.
  • trench warfare begins

  • Blockade of goods created

    The United Kingdom announces that the North Sea is a military area, effectively creating a blockade of goods into Germany.
  • Christmas Truce :)

    December 24 The unofficial Christmas truce is declared.
  • Germany Declares warzone around Britain

    Germany declares a "war zone" around Great Britain, essentially effecting a submarine blockade where even neutral merchant vessels were to be potential targets.
  • poisen gas introduced

    poisen gas WW1The Second Battle of Ypres begins. It is during this battle that the Germans first use poison gas.
  • Third battle of ypres

    people in the battleThe Battle of Passchendaele (also known as the Third Battle of Ypres) begins.
  • Verdun-Bloodiest Battle

    The Battle of Verdun begins. The Battle of Verdun was the longest battle of World War I and was one of the bloodiest.
  • tanks introduced

    The Battle of the Somme begins. During the Battle of the Somme, tanks are first introduced into battle.
  • Russian Revolution

    The Bolsheviks successfully overthrow the Russian government during the 1917 Russian Revolution.
  • U.S. President Woodrow Wilson issues his Fourteen Points to peace.

  • peace with central powers

    Russia signs the Treaty of Brest Litovsk, which is a peace treaty between Russia and the Central Powers.
  • The Treaty of Versailles officially ends WWI.