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1914
- 28 June--Archduke Francis Ferdinand of Austria was assassinated
- 28 June--Austria-Hungary declared war on Serbia
- 29 July--Austria invaded Serbia
- 1 August--Germany declared war on Russia
- 2 August--Germany invaded Luxembourg
- 3 August--Germany declared war on France
- 4 August--Germany invaded Belgium
- 4 August--Great Britain declared war on Germany
- 6 August--Austria declaration of war on Russia
- 12 August--French and British declaration of war on Austria-Hungary
- 23 August--Battle of Mons (British Expeditionary Force)
- 1 October--The first division of Canadian troops sailed to complete its training in Great Britain
- 21 October-17 November--Germany failed to reach the English Channel in the First Battle of Ypres
- 2 November--Russia and Serbia declared war on Turkey
- 5 November--Britain and France declared war on Turkey
1915
- 11 February--The first Canadian soldiers land in France
- 22 April-25 May--The Second Battle of Ypres
- 25 April--Landing of British and French troops at Gallipoli
- 26 April--Secret Treaty of London between England, France, Russia, and Italy
- May-June--The Actions at Festubert and Givenchy
- 23 May--Italy declared war on Austria-Hungary
- 19 December--Beginning of the Allied withdrawal from Gallipoli
1916
- 21 February--Beginning of the Battle of Verdun
- 31 May-1 June--Battle of Jutland
- 2 June-13 June--The Battle of Mount Sorrel
- 4 June--Russia began offensive in eastern Galicia
- 1 July-18 November--Battle of the Somme
- 27 August--Italy declared war on Germany
1917
- 1 February--Germany began unrestricted submarine warfare
- 6 April--The United States declared war on Germany
- 9 April-4 May--Battle of Arras
- April-May--Battle of the Scarpe
- 26 June--American troops began landing in France
- 31 July-9 August--Germany ended Russia's last offensive
- 31 July-10 November--Third Battle of Ypres
- 20 August-15 December--Second Battle of Verdun
- 27 November--Supreme Allied War Council established at Versailles
- 5 December--Russia signed an armistice with Germany
- 7 December--American Declaration of War on Austria-Hungary
- 15 December--Armistice concluded between the Central Powers and Russia
1918
- 8 January--President Wilson announced his Fourteen Points program for peace
- 3 March--Russia signed the Treaty of Brest-Litovsk
- 21 March--Germany launched an offensive along the Somme
- 9 April--Germany launched an offensive at Ypres
- 27 May--Germany launched an offensive on the Aisne
- 15 July-7 August--Second Battle of the Marne
- 8 August-11 August--The Battle of Amiens
- 21 August-3 September--Second Battles of the Somme and of Arras
- 26 September--The Allies began their final offensive on the Western Front
- 29 September--Bulgaria signed an armistice
- 3 November--Austria signed an armistice
- 11 November--Germany signed an armistice
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