Photos: World War I, a century later
In June of 1914, the assassination of Archduke Ferdinand of Austria started a conflict that engulfed Europe and spread to Asia Minor, Africa and beyond. The "War to End All Wars" killed some 9 million combatants and set the stage for an even deadlier conflict — World War II.
World War One Centenary Timeline
In this June 28, 1914 file photo, the Archduke of Austria Franz Ferdinand, center right, and his wife Sophie, center left, walk to their a car in Sarajevo. This photo was taken minutes before their assassination, an event which set off a chain reaction of events that led to World War One. (AP Photo, File)
World War One Centenary Timeline
In this August 1914 file photo, German troops stand in formation during the occupation of Brussels. (AP Photo, File)
World War One Centenary Timeline
In this 1914 file photo, German army troops receive rations from a field transport while advancing toward Brussels. In mid-August 1914 the German army launched its assault on Brussels. (AP Photo, File)
World War One Centenary Timeline
In this 1914 file photo, damage to one of the forts at Liege, Belgium. On August 5,1914, the Battle of Liege began, the siege lasted longer than planned and may have delayed the German advance into France. (AP Photo, File)
World War One Centenary Timeline
In this undated file photo World War One Belgian troops set out from Brussels in the direction of Louvain. (AP Photo, File)
World War One Centenary Timeline
In this undated file photo, Prussian soldiers leaving Berlin for the front are given flowers by a woman during World War One. (AP Photo, File)
World War One Centenary Timeline
In this Aug. 8, 1914 file photo, Russian reservists walk with their belongings in St. Petersburg, Russia. Russia entered World War One with an army which was massive but badly armed. (AP Photo, File)
Gavrilo Princip
In this June 28, 1914 file photo, a suspect, second right, is captured by police in Sarajevo, Yugoslavia. Princip fired the shots that assassinated Archduke Franz Ferdinand, heir to the Austrian-Hungarian throne, and his wife Sophie. (AP Photo, File)
World War One Centenery Timeline
SIXTY-EIGHT - In this 1917 file photo, wounded Canadian and German World War One soldiers help one another through the mud during the Battle of Passchendaele in Passchendaele, Belgium. (AP Photo/File)
World War One Centenary Timeline
FORTY FOUR - In this undated file photo, a British recruiting poster displays Field Marshal Herbert Kitchener in 1914. The poster reads "Your Country Needs You". Kitchener's Army was a group of all-volunteer soldiers formed in the United Kingdom. (AP Photo, FIle)
World War One Centenary Timeline
FORTY THREE - In this 1915 file photo, Turkish soldiers raise their flag at Kanli Sirt, Gallipoli, Turkey during World War One. (AP Photo, File)
World War One Centenary TImeline
FORTY TWO- In this undated file photo, troops are mobilized on the bank of the Danube River across from Belgrade during World War One. Austrian forces captured the Serbian capitol on Oct. 9, 1915. (AP Photo, File)
World War One Centenary Timeline
FORTY ONE - In this undated file photo, the U Boat 139, which sank the Lusitania, in an unknown location. The British liner was sank on May 7, 1915, by a German submarine off the southern coast of Ireland. About 1,150 men, women and children, perished, 114 of whom were Americans. Among those Americans who perished were Charles Frohman, Alfred G. Vanderbilt and Elbert Hubbard. (AP Photo, File)
World War One Centenary Timeline
FORTY - In this May 1, 1915 file photo, the British cargo and passenger ship Lusitania as it sets out for England on its last voyage from New York City. The British ocean liner was sunk off Ireland on May 7, 1915 by a German U-Boat, killing 1,150 people, 114 of them Americans. (AP Photo, File)
World War One Centenary Timeline
In this 1915 file photo, Turkish soldiers take a rest during fighting, with their guns in their hands, in a trench in Gallipoli, Turkey. (AP Photo, File)
World War One Centenary Timeline
In this 1915 file photo, Turkish soldiers form a queue to get water from a fountain, behind their lines in Gallipoli, Turkey. (AP Photo, File)
World War One Centenary Timeline
In this undated file photo, an unidentified soldier, wearing a gas mask around his neck, bangs on a frying pan as a gas warning on the field near Reims, France. (AP Photo, File)
World War One Centenary Timeline
In this 1915 file photo, a bridge, an abandoned tank and shell craters full of water on the battlefield in St. Julien, Belgium. (AP Photo)
World War One Centenary Timeline
In this undated file photos German troops cut a barbed wire fence in an unknown location. (AP Photo, File)
World War One Centenary Timeline
In this undated photo, French troops man a lookout in France during a battle in the Argonne Forest during World War One. (AP Photo, File)
World War One Centenary Timeline
In this 1915 file photo, Mustafa Kemal Ataturk, military Commander of the Turkish troops in Gallipoli, Turkey, looks over the battlefield during World War One. (AP Photo, File)
World War One Centenary Timeline
In this undated file photo, a Turkish cannon moves to the front lines on the Gallipoli Peninsula, Turkey, during World War One. (AP Photo, File)
World War One Centenary Timeline
In this 1915 file photo, a Turkish soldier takes aim at British troops from a trench in Gallipoli, Turkey. (AP Photo File)
World War One Centenary Timeline
THIRTY - In this 1915 file photo, Australian troops arrive in Alexandria, Egypt, en route to the battlefield on the Gallipoli Peninsula during World War One. (AP Photo, File)
World War One Centenary Timeline
TWENTY NINE - In this undated file photo, soldiers of the French Red Cross transport a wounded soldier to a first aid station immediately after the battle of Flanders in Belgium. (AP Photo, File)
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