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Archduke Franz Ferdinard assassinated
Assassination of Archduke Franz Ferdinand, heir to the throne of Austro-Hungarian empire, in Sarajevo, Bosnia -
Austria-Hungary declares war on Serbia
Austria-Hungary declares war on Serbia -
WW1 Starts
WW1 Starts -
Austria-Hungary repeatedly invades Serbia but is repeatedly repulsed
Austria-Hungary repeatedly invades Serbia but is repeatedly repulsed -
Germany declares war on Russia
Outbreak of war - Germany declares war on Russia -
Germany invades neutral Belgium
Germany invades neutral Belgium -
Germany declares war on France
Germany declares war on France -
Britain declares war on Germany
Britain declares war on Germany -
US President Woodrow Wilson declares policy of US neutrality
US President Woodrow Wilson declares policy of US neutrality -
Battle of the Frontiers begins
Battle of the Frontiers begins -
Russia invades East Prussia
Russia invades East Prussia -
Japan declares war on Germany
Japan declares war on Germany -
Battle of Tannenberg
Battle of Tannenberg, which Russia loses; Germany's greatest success of the war on Eastern Front -
Austria-Hungary invades Russian Poland (Galicia)
Austria-Hungary invades Russian Poland (Galicia) -
First Battle of Marne
First Battle of Marne, halts German advance, resulting in stalemate and trench warfare -
First Battle of Masurian Lakes
First Battle of Masurian Lakes, which Russia loses -
First Battle of Aisne begins
First Battle of Aisne begins -
Austro-German attack on western Poland
Austro-German attack on western Poland -
First Battle of Ypres
First Battle of Ypres -
Turkey enters the war on the side of the Central Powers
Turkey enters the war on the side of the Central Powers -
Battle of the Falkland Islands
Battle of the Falkland Islands -
Austria-Hungary repeatedly invades Serbia
Austria-Hungary repeatedly invades Serbia but is repeatedly repulsed -
Unofficial Christmas truce declared by soldiers along the Western Front
Unofficial Christmas truce declared by soldiers along the Western Front -
First German zeppelin attack on England
First German zeppelin attack on England -
Germany declares blockade of Britain
German U-boat attacks on Allied and neutral shipping; declares blockade of Britain -
Second Battle of Masurian Lakes.
Russians suffer heavy losses at Second Battle of Masurian Lakes (also known as the Winter Battle) -
Britain announces blockade of German ports
Britain announces blockade of German ports -
First use of poison gas by Germany starts Second Battle of Ypres
First use of poison gas by Germany starts Second Battle of Ypres -
France, Russia, Italy and Britain conclude secret Treaty of London
France, Russia, Italy and Britain conclude secret Treaty of London -
Austro-German offensive on Galicia begins
Austro-German offensive on Galicia begins -
U-boat sinks British liner Lusitania with the loss of American lives
U-boat sinks British liner Lusitania with the loss of American lives, creating a US-German diplomatic crisis -
Second Battle of Artois begins
Second Battle of Artois begins -
Italy Ignores treaty agreements with the Central Powers
Ignoring treaty agreements with the Central Powers, Italy declares war on Austria-Hungary -
Battles of Isonzo begin
Italians launch unsuccessful attack on Hungarians at 1st, 2nd, 3rd & 4th Battles of Isonzo; there are to be 12 in total -
Germans capture Warsaw
Germans capture Warsaw -
Tsar Nicholas takes command of Russian armies
Tsar Nicholas takes command of Russian armies -
Second Battle of Champagne begins
Second Battle of Champagne begins -
Battle of Verdun starts
German attack on Verdun in the longest battle of the war, ultimately defended by the French at great cost to both sides -
5th, 6th, 7th, 8th and 9th Battles of Isonzo
5th, 6th, 7th, 8th and 9th Battles of Isonzo between Italy and Austria-Hungary -
Germany renounces submarine policy
Germany renounces submarine policy -
Britain and France conclude Sykes-Picot agreement
Britain and France conclude Sykes-Picot agreement -
Battle of Jutland
Battle of Jutland, the biggest naval battle in history, ultimately without a clear victor the biggest naval battle in history, ultimately without a clear victor -
Start of the Battle of the Somme
Start of the Battle of the Somme, with the greatest number of casualties in British military history, 60,000 -
Romania enters the war with the Allies
Romania enters the war with the Allies, but is quickly overrun by German forces -
Italy declares war on Germany
Italy declares war on Germany -
Germany suspends submarine assaults
Germany suspends submarine assaults -
Tanks introduced for the first time on the Somme battlefield by the British
Tanks introduced for the first time on the Somme battlefield by the British -
Germany resumes U-boat attacks
Germany resumes U-boat attacks -
US President Woodrow Wilson secures re-election
US President Woodrow Wilson secures re-election -
End of the Battle of the Somme
End of the Battle of the Somme -
David Lloyd George replaces Asquith as British Prime Minister
David Lloyd George replaces Asquith as British Prime Minister -
Battle of Verdun ends
German attack on Verdun in the longest battle of the war, ultimately defended by the French at great cost to both sides -
Germany announces unrestricted submarine warfare
Germany announces unrestricted submarine warfare -
US severs diplomatic ties with Germany
US severs diplomatic ties with Germany -
Britain intercepts Zimmerman telegram
Zimmermann Telegram is passed to the US by Britain, detailing alleged German proposal of an alliance with Mexico against the US -
US declares war on Germany
US declares war on Germany -
Nivelle Offensive
Nivelle Offensive (Second Battle of Aisne, Third Battle of Champagne) ends in French failure -
10th, 11th and 12th Battles of Isonzo
10th, 11th and 12th Battles of Isonzo fought, ending in Italian failure -
Greece enters the war on the side of the Allies
Greece enters the war on the side of the Allies -
Third Battles of Ypres (Passchendaele) begins
Third Battles of Ypres (Passchendaele) begins -
Major British offensive launched at Ypres
Major British offensive launched at Ypres -
Bolshevik Revolution,Lenin becomes Dictator of Russia
Bolshevik Revolution results in Lenin becoming leader of Russia -
US declares war on Austria-Hungary
US declares war on Austria-Hungary -
Germany launches second Spring offensive
Germany launches second Spring offensive, the Battle of the Lys, in the British sector of Armentieres -
German U-boats appear in US waters for first time
German U-boats appear in US waters for first time -
Third German Spring offensive, Third Battle of the Aisne
Third German Spring offensive, Third Battle of the Aisne, begins in French sector along Chemin des Dames -
Battle of Piave
Italians prevail against Austro-Hungarian forces at Battle of Piave -
Final phase of great German Spring push, the Second Battle of Marne begins
Final phase of great German Spring push, the Second Battle of Marne, begins -
Germany and Austria send peace notes to US President
Germany and Austria send peace notes to US President Woodrow Wilson requesting an armistice -
Germany ceases unrestricted submarine warfare
Germany ceases unrestricted submarine warfare -
German republic is founded
German republic is founded -
Start of peace negotiations in Paris
Start of peace negotiations in Paris -
Treaty of Versailles drafted and signed
Treaty of Versailles drafted and signed
