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World War I

  • 24 Jul 1923

    The Treaty of Lausanne is signed between Turkey and the countries that formed the Allied Powers in the First World War.

  • 10 Jan 1920

    The Treaty of Versailles takes effect.

  • 11 Nov 1918

    After nearly four and a half years of cataclysmic conflict, World War I ended.

  • 8 Oct 1918

    American Army Corporal Alvin York and seven men attacked a major German gun nest on their own during World War I.

  • 21 Apr 1918

    The Red Baron is killed.

  • 31 Jul 1917

    Third Battle of Ypres begins in Flanders

  • 24 Jul 1917

    Dutch exotic dancer Mata Hari was put on trial in Paris after being accused of being a spy.

  • 5 Jun 1917

    Registration of US men aged between 21 and 31 began for troops for WWI.

  • 18 May 1917

    The US Congress passed Selective Service Act.

  • 6 Apr 1917

    The US declared war against Germany and its Central Powers Alliance in World War I.

  • 18 Nov 1916

    Battle of the Somme ends.

  • 5 Oct 1916

    During World War I, as a soldier, Adolf Hitler was injured by a grenade blast.

  • 15 Sep 1916

    Tanks were used for the first time in battle, at the Battle of the Somme, during World War I.

  • 1 Jul 1916

    The Battle of Somme began.

  • 30 Apr 1916

    Germany and its World War I allies become the first countries to use daylight saving time (DST).

  • 9 Jan 1916

    During WWI, The Battle of Gallipoli concluded with an Ottoman Empire victory when the last Allied forces were evacuated from the Peninsula.

  • 1 Jan 1916

    Medical researcher Oswald Hope Robertson performed the first-ever blood transfusion using stored and refrigerated blood.

  • 20 Dec 1915

    The last Australian troops were evacuated from Gallipoli during World War I.

  • 7 May 1915

    A German U-Boat sinks the RMS Lusitania.

  • 26 Apr 1915

    The Treaty of London was signed by Italy, Britain, France, and Russia.

  • 3 Mar 1915

    The US National Advisory Committee for Aeronautics was founded as an emergency measure during WWI.

  • 24 Dec 1914

    Unofficial ceasefires sprang up across World War I's Western Front.

  • 19 Oct 1914

    First Battle of Ypres.

  • 6 Sep 1914

    The First Battle of the Marne began during World War I.

  • 23 Aug 1914

    During World War I, Japan officially declared war on Germany.

  • 18 Aug 1914

    President Woodrow Wilson issued a Proclamation of Neutrality.

  • 7 Aug 1914

    The first British troops arrived in France during World War I.

  • 4 Aug 1914

    Britain declares war on Germany.

  • 4 Aug 1914

    The United States of America declared neutrality at the beginning of World War I.

  • 3 Jul 1914

    Germany declared war on France and sent its first wave of troops to Belgium to start the attack.

  • 28 Jun 1914

    Franz Ferdinand and his wife Sophie were assassinated, ultimately causing World War I.

  • 8 Apr 1904

    France and the United Kingdom sign the Entente cordiale.