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World War I (1914–1918) Remembering 100 Years
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June 1914
Assassination of Franz Ferdinand
Serbian Gavrilo Princip assassinates Archduke Franz Ferdinand, heir to the throne of the Austro-Hungarian Empire, in Sarajevo after Bosnia-Herzegovina is annexed into Austria.
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July 1914
Austria-Hungary Declares War on Serbia
A month after the assassination of the archduke, Austria-Hungary declares war on Serbia, beginning the First World War. A series of alliances quickly brings Germany, Russia, and France into the conflict.
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August 1914
Germany Declares War on Russia and France
After Germany declares war on Russia and France in the first days of August, the Germany military quickly mobilizes its troops and invades Belgium, who had remained neutral.
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August 1914
Great Britain Enters the War
When Germany refuses to remove their troops from Belgium, Great Britain issues a declaration of war on 4 August 1914.
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August 1914
Battle of Tannenberg
Germans decimate Russian forces in a maneuver aided by intercepted radio communications and discord among Russian generals. Some 92,000 Russian fighters are taken as prisoners of war.
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September 1914
First Battle of the Marne
Germany invades France, sparking a week-long Franco-British counterattack, including a rush of soldiers to the frontlines in taxis and buses. Strategic offensives by Allies result in a German retreat.
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October 1914
First Battle of Ypres
In October of 1914, the First Battle of Ypres finds countries battling to control ports in Northern France. The muddy struggle of trench warfare is many soldiers’ first taste of the Great War.
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Dec 1914
First Zeppelin Raids on England
In the middle of the night, the Norfolk Coast explodes with terrifying noise as enormous German airships drop bombs on Great Britain for the first time.
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December 1914
Christmas Truce
Around Christmas Day in December 1914, the bloody struggle of the Great War is paused as both the Allies and the Central Powers celebrate a temporary—and unofficial—ceasefire.
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January 1915
Bombing Raids on Britain
Starting in January 1915, Germany attacks Britain from above, carrying out 50 zeppelin raids in three years. Though the death toll never passes 1,500, the bombings cause panic and hurt morale.
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March 1915
Churchill Resigns
In the fallout of the failed Battle of Gallipoli, Winston Churchill resigns from his governmental post and joins the army, commanding a battalion in the trenches of France.
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April 1915
Dardanelles and Gallipoli Campaigns
In hopes of capturing the Ottoman capital of Constantinople, Russian, British, and French troops land on the Gallipoli Peninsula in April of 1915. Eight months later, defeated Allied troops withdraw to Egypt.
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April 1915
Second Battle of Ypres
Germans unleash poison gas on the Allied forces, the first use of a chemical weapons in a major military offensive. Flooding the trenches, the toxic fumes result in high casualties.
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May 1915
Zeppelins Attack London
Zeppelins began hitting strategic sites in London. Though Kaiser Wilhelm forbade attacks on royal palaces and residential areas, many civilians lost their lives in the bombings.
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May 1915
Sinking of the Lusitania
On 7 May 1915, a German U-boat torpedoes the British ocean liner Lusitania, killing 1,198—including 128 Americans. The tragedy rouses anti-German sentiment and helps bring the U.S. into the war.
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September 1915
Battle of Loos
The Battle of Loos in September 1915 is one of the largest Allied offensives in the war. Despite the strength of 75,000 British soldiers, “The Big Push” brings minor gains and high casualties.
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February 1916
Battle of Verdun
In February of 1916, the Germans attack the French at Verdun. It turns into the longest battle of the war; fighting continues for nine months and resulted in approximately one million causalities.
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May 1916
Battle of Jutland
In the war’s only full-scale conflict at sea, German battleships near Jutland, Denmark, face the powerful British fleet on 31 May 1916. After a day of fighting, both sides claim victory.
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July 1916
Battle of the Somme
In July 1916, French and British troops challenge Germany in the Battle of the Somme—a five-month confrontation that includes the bloodiest day in British history when almost 60,000 soldiers fall.
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January 1917
German U-boat Campaign
Desperate for victory, in early 1917 the German Kaiser signs an order resuming unrestricted submarine warfare targeting British and Allied vessels in hopes of disrupting shipments of food and munitions.
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April 1917
U.S. Declares War on Germany
After years of neutrality, the United States officially enters the war on 6 April 1917, providing much needed manpower and financial aid to the Allied cause.
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July 1917
Battle of Passchendaele
The Allies launch an offensive attack against Germany on 31 July 1917 in the Battle of Passchendaele. Once again, Ypres, Belgium, is turned into a battlefield of mud, mustard gas, and mass casualties.
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November 1917
Battle of Cambrai
In November and December of 1917, tanks became a staple of war during the Battle of Cambrai, when the British deploy almost 500 equipped with machine guns and artillery.
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December 1917
Treaty of Brest-Litovsk
After suffering more than 1.7 million casualties, Russians sign a treaty with leaders of the Central Powers on 3 March 1918, in Belarus, officially withdrawing from the war.
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March 1918
German Spring Offensive
On the first day of spring, 21 March 1918, Germany begins their last offensive against a British-held section of the Western Front. Almost a million Germans are lost in their quest for victory.
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April 1918
Forming the RAF
In response to frequent bombing raids by the Germans, Great Britain forms the Royal Air Force in April 1918. By war’s end it is the largest air force in the world.
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April 1918
Battle of the Lys
During the three-week battle in April of 1918, British, Portuguese, Belgian, French, and American troops attack German lines in Flanders, Belgium. In the end, casualties ran high on both sides of no man’s land.
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July 1918
Second Battle of the Marne
In the summer of 1918, British troops ally themselves with the French (pictured), Americans, and Italians to defeat Germany along the Western Front. This decisive battle marks the Allied advance to victory.
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August 1918
100-Days Offensive
Starting in August 1918, and lasting through the fall, the Allies launch a series of attacks, hoping to force the Germans out of France, eventually bringing the war to a close.
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November 1918
Armistice Ends the War
In 1918, at 11 a.m. on the 11th day of the 11th month, the Great War officially comes to an end when German and Allied forces sign a ceasefire in Compiègne, France.
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