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Russia Mobilizes
Russia begins mobilizing its forces in defense of Serbia, escalating tensions -
Britain Declares War on Germany
Britain declares war on Germany in response to the invasion of Belgium -
Assassination of Archduke Franz Ferdinand
The heir to the Austro-Hungarian throne is assassinated by Gavrilo Princip in Sarajevo, triggering a chain reaction that leads to the war. -
Austria-Hungary Declares War on Serbia
Austria-Hungary declares war on Serbia, beginning the escalation of the conflict. -
Germany Declares War on Russia
In response to Russia’s mobilization, Germany declares war on Russia -
Germany Declares War on France
Germany declares war on France as part of its strategy to invade France via Belgium -
Germany Invades Belgium
Germany invades Belgium, violating its neutrality, prompting Britain to declare war on Germany -
First Battle of the Marne
Allied forces stop the German advance into France, marking a significant turning point early in the war (September 6–12, 1914) -
The Battle of Ypres
The first battle of Ypres takes place in Belgium, with heavy losses on both sides (October 19 – November 22, 1914) -
Gallipoli Campaign
Allied forces attempt to secure a route to Russia through the Dardanelles, but are defeated by the Ottoman Empire (April 25, 1915 – January 9, 1916) -
The Battle of Verdun
One of the longest and bloodiest battles of WWI, with over 700,000 casualties (February 21 – December 18, 1916). -
The Battle of the Somme
One of the largest battles of the war, with over one million casualties, it marks the first use of the tank in warfare (July 1 – November 18, 1916) -
Russian Revolution
The Russian Revolution leads to the overthrow of the Tsarist government and the rise of the Bolsheviks under Lenin (March through November 1917) -
United States Enters the War
The United States declares war on Germany following unrestricted submarine warfare and the Zimmermann Note -
The Battle of Passchendaele
Also known as the Third Battle of Ypres, it results in heavy casualties and gains little ground for either side (July 31 – November 10, 1917) -
The Spring Offensive (March – July 1918)
Germany launches a series of offensives on the Western Front in a last-ditch attempt to win the war -
Russia Signs the Treaty of Brest-Litovsk
Soviet Russia exits the war, signing a peace treaty with the Central Powers -
Treaty of Versailles
The peace treaty officially ends the war, placing heavy reparations and territorial losses on Germany -
The Second Battle of the Marne
The Allied forces, bolstered by American troops, successfully repelled the last German offensive (July 15 – August 5, 1918) -
Armistice Signed
An armistice is signed between Germany and the Allies, ending the fighting on the Western Front