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Pre-WWI
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, Bosnia. -
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History of World War One
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Pre-WWI
Austria-Hungary declares war on Serbia. -
WWI
Germany declares war on Russia. -
WWI
Germany declares war on France. -
WWI
The United Kingdom declares war on Germany, after Germany invades Belgium. -
WWI
Austria-Hungary declares war on Russia and Serbia declares war on Germany. -
WWI
U.S. President Woodrow Wilson announces the U.S. will remain neutral. -
WWI
The Battle of Tannenberg begins. -
WWI
The First Battle of the Marne begins. Trench warfare begins as soldiers on both sides dig in. -
WWI
Battle of Ypres begins -
WWI
The United Kingdom announces that the North Sea is a military area, effectively creating a blockade of goods into Germany. -
WWI
The unofficial Christmas truce is declared -
WWI
Germany declares a "war zone" around Great Britain, essentially effecting a submarine blockade where even neutral merchant vessels were to be potential targets -
WWI
The Dardanelles Campaign begins. -
WWI
The Second Battle of Ypres begins. It is during this battle that the Germans first use poison gas. -
WWI
The Battle of Gallipoli begins. -
WWI
The British ocean liner RMS Lusitania is sunk by German U-boat, U-20 -
WWI
Tsar Nicholas II takes personal control over Russia's armies. -
WWI
The Battle of Verdun begins. The Battle of Verdun was the longest battle of World War 1 and was one of the bloodiest. -
WWI
The Battle of Jutland, the major naval battle of the war, begins. -
WWI
The Battle of the Somme begins. During the Battle of the Somme, tanks are first introduced into battle. -
WWI
Germany sends the secret Zimmerman Telegram to Mexico in an effort to entice Mexico to join the war. The British intercept and decipher the coded message. -
WWI
The United States declares war on Germany. -
WWI
The Battle of Passchendaele (also known as the Third Battle of Ypres) begins -
WWI
The Bolsheviks successfully overthrow the Russian government -
WWI
The armistice agreed upon between the new Russian government and the Central Powers goes into effect. -
WWI
U.S. President Woodrow Wilson issues his Fourteen Points to peace -
WWI
Russia signs the Treaty of Brest Litovsk, which is a peace treaty between Russia and the Central Powers. -
WWI
Germany launches the Spring Offensive. -
WWI
German flying ace, Baron Manfred von Richthofen (more commonly known as the Red Baron), is shot down. -
WWI
The Second Battle of the Marne begins. -
WWI
German Kaiser Wilhelm II abdicates and flees Germany -
WWI
Germany signs the armistice at Compiegne, France. Fighting ends on the 11th hour of the 11th day of the 11th month (i.e. 11 a.m. on November 11). -
Post-WWI
The Treaty of Versailles officially ends World War 1.