Assassination of Archduke Ferdinand 28th June, 1914

Austra-Hungary demands that Serbia arrest the leaders of the Black Hand 23rd July, 1914

Serbia appeals to Russia for help 24th July, 1914

Serbia refuses to hand over leaders of the Black Hand group 25th July, 1914

Austria-Hungary declares war on Serbia 28th July, 1914

Germany declares war on Russia 1st August, 1914

Germany declares war on France 3rd August, 1914

Moltke orders the Schlieffen Plan to proceed 4th August, 1914

German troops enter Belgium 4th August, 1914

Great Britain declares war on Germany 4th August, 1914

Lord Kitchener calls for 100,000 men to join British Army 7th August, 1914

Big Bertha used against Liege Forts 12th August, 1914

Austro-Hungarian troops invade Serbia 12th August, 1914

French troops enter Lorraine 14th August, 1914

British Expeditionary Force arrives in France 22nd August, 1914

Battle of Mons begins 23rd August, 1914

French Army abandons Plan 17 24th August, 1914

Battle of Tannenberg begins 26th August, 1914

Battle of Heligoland 28th August, 1914

War Propaganda Bureau Writers Conference 2nd September, 1914

Battle of the Marne begins 6th September, 1914

French troops attack German Army at the River Aisne 13th September, 1914

Battle of Albert 25th September, 1914

Battle of Arras 1st October, 1914

First German aircraft shot down by Allied plane 5th October, 1914

Battle of Ypres 15th October, 1914

Canadian troops arrive in Britain 16th October, 1914

Turkey joins Central Powers 29th October, 1914

Anglo-Indian invasion of Mesopotamia 21st November, 1914

Farman MF-11 carries out first night bombing raid 21st December, 1914

Christmas Truce on the Western Front 25th December, 1914

South African forces occupy Swakopmund 14th January, 1915

Battle of Dogger Bank 24th January, 1915

BEF attacks at Neuve Chapelle 10th March, 1915

Allied naval attack on the Dardanelles 18th March, 1915

Roland Garros uses deflector plates 1st April, 1915

German gas attack at Ypres 22nd April, 1915

Allied landings at Gallipoli 25th April, 1915

Sinking of the Lusitania 7th May, 1915

Artois Offensive 9th May, 1915

Italy declares war on Austria-Hungary 23rd May, 1915

Germany abandons Ypres offensive 25th May, 1915

Asquith forms coalition government 25th May, 1915

First Zeppelin raid on London 31st May, 1915

Isonzo Offensive begins 23rd June, 1915

Suvla Bay Offensive at Gallipoli 6th August, 1915

Grand Duke Nikolai sacked as Commander-in-Chief 5th September, 1915

First tank demonstrated to British military leaders 11th September, 1915

Anglo-French Offensive at Artois-Loos 25th September, 1915

Allied troops land at Salonika 5th October, 1915

Edith Cavell executed 12th October, 1915

Sir Douglas Haig, new BEF commander 19th December, 1915

Britain introduces conscription 2nd February, 1916

German Verdun Offensive 21st February, 1916

Germany declares war on Portugal 9th March, 1916

Battle of Jutland 31st May, 1916

Russian Brusilov Offensive 4th June, 1916

Lord Kitchener killed at sea 5th June, 1916

Start of Anglo-French Somme Offensive 1st July, 1916

Italian Gorizia Offensive 9th August, 1916

Hindenburg becomes German Chief of Staff 29th August, 1916

First use of British tanks at Flers-Courcelette 15th September, 1916

French recapture Douaumont Fort at Verdun 24th October, 1916

Somme Offensive ends 18th November, 1916

Beatty replaces Jellicoe as C-in-C of Grand Fleet 29th November, 1916

Lloyd George becomes British Prime Minister 6th December, 1916

Nivelle becomes French Western Front C-in-C 12th December, 1916

Zimmermann Telegram intercepted by Britain 19th January, 1917

Battle of Gaza begins 26th March, 1917

United States declares war on Germany 6th April, 1917

Start of Nivelle Offensive 9th April, 1917

Start of Arras offensive 9th April, 1917

Canadian Army captures Vimy Ridge 12th April, 1917

2nd Battle of the Aisne begins 16th April, 1917

French tanks used for the first time in battle 17th April, 1917

Petain becomes French Western Front C-in-C 15th May, 1917

Maria Bochkareva forms the Women's Battalion 16th May, 1917

John Pershing given command of AEF 19th May, 1917

British attack at Messines 7th June, 1917

United States troops arrive in France 25th June, 1917

Greece declares war on the Central Powers 29th June, 1917

King George V changes name to Windsor 17th July, 1917

British Offensive at Passchendaele 12th October, 1917

Italian Caproretto Offensive 24th October, 1917

Sir Frederick Maude dies in Mesopotamia 18th November, 1917

Massed tank attack at Cambrai 20th November, 1917

Bolshevik government disbands Women's Battalion 21st November, 1917

Wilson announces 14 Points Peace Programme 8th January, 1918

Start of German Spring Offensive 21st March, 1918

Foch appointed Allied Co-ordinator in France 29th March, 1918

3rd Battle of the Aisne begins 27th May, 1918

Battle of Le Hamel 4th July, 1918

2nd Battle of the Marne 15th July, 1918

German retreat at the Marne 20th July, 1918

Amiens Offensive 8th August, 1918

Allied breakthrough at Albert 21st August, 1918

United States St Mihiel Offensive 12th September, 1918

Meuse-Argonne Offensive begins 26th September, 1918

Canal du Nord Offensive 27th September, 1918

Max von Baden appointed Chancellor of Germany 3rd October, 1918

Allied forces capture the Hindenburg Line 5th October, 1918

Italian Vittorio Veneto Offensive 23rd October, 1918

Kaiser Wilhelm II of Germany abdicates 9th November, 1918

Armistice 11th November, 1918

Lloyd George wins British General Election 14th December, 1918

Paris Peace Conference 12th January, 1919

Treaty of Versailles signed 28th June, 1919