Photos: World War One Centenary
A look back at key events in World War I.
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)
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 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)
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 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 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)
Belgium World War One Centenary Timeline
SEVEN IN TIMELINE - In this undated file photo, Serbian soldiers take position on the battle line. Some of the first battles of World War One were fought between Serbia and Austria-Hungary around the Cer Mountain region. (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 August 1914 file photo, German troops stand in formation during the occupation of Brussels. (AP Photo, File)
World War One Centenary Timeline
TEN IN TIMELINE - In this 1914 file photo, a bridge across the Meuse River in Belgium, which was destroyed by retreating Belgian troops, is being rebuilt by invading German troops. (AP Photo, File)
World War One Centenary TImeline
ELEVEN IN TIMELINE - In this Aug. 1914 file photo, a Belgian machine gun detachment sets up near Haelen, Belgium. The Belgians often used dogs to draw the ammunitions cart. The Battle of Haelen was also known as the Battle of the Silver Helmets. (AP Photo, File)
World War One Centenary Timeline
TWELVE IN TIMELINE - In this 1914 file photo, a man stands next to a building damaged by shrapnel from bombs dropped from a Zeppelin in Antwerp, Belgium. Antwerp was damaged heavily during World War One. (AP Photo, File)
World War One Centenary Timeline
THIRTEEN IN TIMELINE - In this Sept. 1914 file photo, the Cathedral of Reims, France smokes after bombardment during World War One. The advancing German Army heavily damaged the city. (AP Photo, File)
World War One Centenary Timeline
FOURTEEN IN TIMELINE - In this undated file photo, Indian troops arrive in France during World War One. (AP Photo, File)
World War One Centenary Timeline
FIFTEEN IN TIMELINE - In this undated file photo, German soldiers speak with each other on the Western Front during World War One. (AP Photo, File)
World War One Centenary Timeline
SIXTEEN IN TIMELINE - In this undated file photo, France's battle torn Marne district is reduced to rubble and mud during World War One. (AP Photo, File)
World War One Centenary Timeline
SEVENTEEN IN TIMELINE - In this 1914 file photo, German troops march through the streets of Antwerp, Belgium during World War One. (AP Photo, File)
World War One Centenary Timeline
EIGHTEEN IN TIMELINE - In this Oct. 1914 file photo, people crowd the Antwerp quaysides as they prepare for an exodus out of the city during World War One. (AP Photo, File)
World War One Centenary Timeline
NINETEEN IN TIMELINE - In this Oct. 14, 1914 file photo, Belgian civilians and a cavalry detail move out of the pathway of the German advance during World War One in Antwerp, Belgium. (AP Photo)
World War One Centenary Timeline
TWENTY IN TIMELINE - In this 1914 file photo, small boats, pushed together, create a pontoon bridge over the Scheldt River in Antwerp, Belgium. The bridge was constructed during World War One for residents and troops to escape the German Army. (AP Photo, File)
World War One Centenary Timeline
TWENTY INÂ TIMELINE - In this 1914 file photo, Allied troops huddle in a trench around a tiny fire near Ypres, Belgium. (AP Photo, File)
World War One Centenary Timeline
TWENTY TWO IN TIMELINE - In this Dec. 1914 file photo, damage from German bombardment to the lighthouse in Scarborough,northern England during World War One. (AP Photo, File)
World War One Centenary Timeline
TWENTY THREE IN TIMELINE - In this Dec. 1914 file photo, damage to the Royal Hotel in Scarborough, northern England after a bombing raid. (AP Photo)
World War One Centenary Timeline
TWENTY FOUR IN TIMELINE - In this undated file photo, bodies on a battlefield after the battle of Champagne in France during World War One. (AP Photo, File)
World War One Centenary Timeline
TWENTY FIVE IN TIMELINE - Serbian troops on the promenade of the public gardens in Belgrade in an undated photo. (AP Photo)
World War One Centenary Timeline
TWENTY SIX IN TIMELINE - In this 1914 file photo, German soldiers gather at Christmas at an unknown location during World War One. (AP Photo, File)
World War One Centenary Timeline
TWENTY SEVEN IN TIMELINE - A lone wounded Austrian soldier lies on the field of battle during World War One in an undated photo. (AP Photo)
World War One Centenary Timeline
TWENTY EIGHT IN TIMELINE - In this undated file photo, Allied soldiers eat and drink in a shell hole in France 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)
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
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
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, 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 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 undated file photos German troops cut a barbed wire fence in an unknown location. (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 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, 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 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
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
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 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 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 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 FIVE IN TIMELINE - In this April 8, 1916 file photo, French soldiers move troops and cargo at Nixeville, France, during the World War One Battle of Verdun. (AP Photo, File)
World War One Centenary TImeline
FORTY SIX IN TIMELINE - In this undated file photo, one of the batteries of the famous French 75's at Douaumont, France during the World War One Battle of Verdun. (AP Photo, File)
World War One Centenary Timeline
FORTY SEVEN IN TIMELINE - In this 1917 file photo, the battlefield, pockmarked with craters filled with water, after the major World War One Battle of Verdun, France. (AP Photo, File)
World War One Centenary Timeline
FORTY EIGHT IN TIMELINE - In this August 1916 file photo, Gen. Sir Sam Hughes and an unidentified group look at ruins in Arras, France during World War One. (AP Photo, File)
World War One Centenary Timeline
FORTY NINE IN TIMELINE - In this Oct. 1917 file photo, French troops in a shell hole during the offensive which resulted in its winning back of the Chemin des Dames in France at the end of October 1917. (AP Photo, File)
World War One Centenary Timeline
FIFTYÂ - In this 1916 file photo, French troops attend to the funeral of an unknown aviator at an unknown location. (AP Photo, File)
World War One Centenary TImeline
FIFTY ONE IN TIMELINE - In this Aug. 1917 file photo, French troops walk on regained ground near the River Meuse, near Beaumont, France during World War One. (AP Photo, File)
World War One Centenary Timeline
FIFTY TWO IN TIMELINE - In this undated photo, Turkish soldiers at a military review at Damascus, Syria. (AP Photo, File)
World War One Centenary Timeline
FIFTY THREE IN TIMELINE - In this May 31, 1916 file photo, the German fleet with battle cruisers on the way in the North Sea to meet the British Grand Fleet in the Battle of Jutland during World War One. (AP Photo, File )
World War One Centenary Timeline
FIFTY FOUR IN TIMELINE - in this May 31,1916 file photo, the British Grand Fleet under admiral John Jellicoe on their way to meet the Imperial German Navy's fleet for the Battle of Jutland in the North Sea. (AP Photo, File)
World War One Centenary TImeline
FIFTY FIVE IN TIMELINE - In this 1916 file photo, German troops man a machine gun post from a trench at the Vistula River in Russia during World War One. (AP Photo, File)
World War One Centenary TImeline
In this 1916 file photo, Australian artillery soldiers operate a large caliber gun at the Somme front, in France during World War One. (AP Photo, File)
World War One Centenary Timeline
 In this undated file photo, French soldiers carry the wounded during the World War One Battle of the Somme, France. (AP Photo, File)
Georges Guynemer
FIFTY EIGHT IN TIMELINE - In this Sept. 24, 1916 file photo, French Captain Georges Guynemer in front of his shot-down plane in Piennes, France during World War One. (AP Photo, File)
World War One Centenary Timeline
FIFTY NINE IN TIMELINE - In this undated photo, soldiers attend a burial just in back of the battle lines in Pervyse, Belgium. (AP Photo, File)
World War One Centenary Timeline
SIXTY IN TIMELINE - In this April 2, 1917 file photo, President Woodrow Wilson delivers a speech to the joint session of Congress, in Washington, United States, during World War One. (AP Photo, File)
World War One Centenary Timeline
SIXTY ONE IN TIMELINE-In this 1917 file photo, German soldiers bring in Canadian wounded during the Battle of Vimy, France during World War One. (AP Photo, File)
World War One Centenary Timeline
SIXTY TWO IN TIMELINE - In this undated photo, German mine-throwing troops, at an attack at the Keil and Poehl mounts, Germany. (AP Photo, File)
World War One Centenary Timeline
SIXTY THREE IN TIMELINE - In this 1917 file photo, World War One Canadian soldiers carry a stretcher through the mud near Boesinghe, Belgium. (AP Photo/File)
World War One Centenary Timeline
SIXTY FOUR IN TIMELINE - In this undated file photo, a Canadian soldier helps an injured German soldier to a dressing station. (AP Photo, File)
World War One Centenary Timeline
SIXTY FIVE IN TIMELINE - In this 1917 file photo, an unidentified World War One soldier walks along wooden planks placed over the mud of Flanders’ Fields near the Yperlee Canal near Ypres, Belgium. (AP Photo/File)
World War One Centenary Timeline
SIXTY SIX IN TIMELINE - In this 1917 file photo, British World War One soldiers return in formation to Ypres, Belgium. (AP Photo/File)
World War One Centenary Timeline
SIXTY SEVEN IN TIMELINE - In this undated file photo, the cathedral in the town square of Ypres, Belgium, is in ruins after bombing in World War One. (AP Photo)
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
SIXTY NINE IN TIMELINE - In this undated file photo, World War One wounded are being placed in ambulance during the advance on Lens, France. (AP Photo, File)
World War One Centenary Timeline
SEVENTY IN TIMELINE - In this undated file photo, dancer "Mata Hari", who was born Margaretha Geertruida Zelle poses in an unknown location. Zelle was executed October 15, 1917 during World War One for spying for Germany. (AP Photo, File)
World War One Centenary Timeline
SEVENTY ONE IN TIMELINE - In this 1917 file photo, an old type tank from World War One. Tanks came into use during World War One and increased the mobility of soldiers who were mainly fighting a trench war. Their design was taken from farm vehicles. (AP Photo, File)
World War One Centenary Timeline
SEVENTY TWO IN TIMELINE - In this undated file photo, British troops run under heavy fire outside Cambrai, France during World War One. (AP Photo, File)
France Brabant-en-Meuse WW I Trench
SEVENTY THREE IN TIMELINE - In this 1917 file photo, a World War One trench winds through the village of Brabant-en-Meuse near Verdun, France in 1917. (AP Photo, File)
World War One Centenary Timeline
SEVENTY FOUR IN TIMELINE - In this Dec. 1917 file photo, smoke billows out of buildings in Cambrai, France, after being bombarded by German forces during the World War One Battle of Cambrai. (AP Photo, File)
World War One Centenary Timeline
SEVENTY FIVE IN TIMELINE - In this Dec. 9, 1917 file photo, British General Sir Edmund Allenby enters the captured city of Jerusalem, during World War One. (AP Photo, File)
World War One Centenary Timeline
SEVENTY SIX IN TIMELINE - In this undated file photo, wounded World War One soldiers play a game at a London hospital. (AP Photo, File)
World War One Centenary Timeline
SEVENTY SEVEN IN TIMELINE - In this 1917 file photo, members of the first contingent of New Yorkers drafted into the United States Army line up in front of their barracks at Camp Upton, Yaphank, Long Island, N.Y. (AP Photo, File)
World War One Centenary Timeline
SEVENTY EIGHT IN TIMELINE - In this June 1917 file photo, the first troops of the American Expeditionary Force land at the French port of St. Nazaire, France. (AP Photo, File)
World War One Centenarty Timeline
SEVENTY NINE IN TIMELINE - In this 1917 photo provided by the U.S. Signal Corps, the first 5,000 American soldiers to reach England march across historic Westminster Bridge in London. (AP Photo/U.S. Signal Corps)
John Pershing
EIGHTY OF ONE HUNDRED IN TIMELINE - In this June 13, 1917 file photo, U.S. Army General John J. Pershing, center, inspects French troops at Boulogne, France. (AP Photo, File)
World War One Centenary Timeline
EIGHTY ONE IN TIMELINE - In this March 15, 1918 file photo, an American soldier from the First Division throws a hand grenade in battle during World War One along the Western Front in France. (AP Photo, File)
World War One Centenary Timeline
EIGHTY TWO IN TIMELINE - In this March 1918 file photo, American soldiers of Company K, 165th Infantry of the Fighting 69th, Old Rainbow Division, march to the trenches at St. Clement, France during World War One. (AP Photo, File)
World War One Centenary Timeline
EIGHTY THREE IN TIMELINE - In this April 25, 1918 file photo, a field of barbed wire in a no-man's land near Ancerviller, France, during World War One. The area was a sector of the 2nd Battalion, 165th Infantry. (AP Photo/U.S. Army Signal Corps, FIle)
Manfred von Richthofen
EIGHTY FOUR IN TIMELINE - In this 1916 file photo, German flying ace Manfred von Richthofen, also known as the "Red Baron," is shown returning from a mission at his squadron's aerodrome. Von Richthofen was shot down and killed over France in April 1918. (AP Photo, File)
World War One Centenary Timeline
EIGHTY FIVE IN TIMELINE - In this undated file photo, two soldiers are passed by tanks on their way to support French troops in Juvigny, France, during World War One. (AP Photo, File)
World War One Centenary TImeline
EIGHTY SIX IN TIMELINE - In this May 28, 1918 file photo, the 28th Infantry Regiment of the First Division, A.E.F. goes over the top of a trench during an American offensive of World War One in the Battle of Cantigny, France. (AP Photo, File)
World War One Centenary Timeline
EIGHTY SEVEN IN TIMELINE - In this undated file photo, soldiers attend the burial of fellow soldiers and two Canadian nurses, killed in German air raid, during World War One. (AP Photo, FIle)
World War One Centenary Timeline
EIGHTY EIGHT IN TIMELINE - In this undated file photo, United States Army troops stand in the trenches in France during World War One. (AP Photo, File)
World War One Centenary Timeline
EIGHTY NINE IN TIMELINE - In this 1918 file photo, American troops carrying guns with fixed bayonets climb over a sandbag revetment in France during World War One. (AP Photo, File)
World War One Centenary Timeline
NINETY IN TIMELINE - In this 1918 file photo, Italian army soldiers look out of their dugouts at the Battle of the Piave River, Italy during World War One. The Battle of the Piave River was fought between June 15-23, 1918. (AP Photo, File)
World War One Centenary Timeline
NINETY ONE IN TIMELINE - In this 1918 file photo, members of the Red Cross sort the backpacks of dead and wounded soldiers in France, during World War One. (AP Photo, File)
World War One Centenary Timeline
NINETY TWO IN TIMELINE - In this July 1918 file photo, American troops from the 18th Infantry, First Division, pause in a ruined French town near St. Mihiel, France during World War One. (AP Photo, File)
World War One Centenary Timeline
In this Sept. 13, 1918 file photo, U.S. troops of the 107th Regiment Infantry, 27th Division, advance on a path through a barbed wire entanglement near Beauqueanes, Somme, France during World War One. (AP Photo/U.S. Army Signal Corps, File)
World War One Centenary Timeline
NINETY FOUR IN TIMELINE - In this undated file photo, German reserves being rushed to front by trucks in Germany.(AP Photo, File)
World War One Centenary Timeline
NINETY FIVE IN TIMELINE - In this 1918 file photo, U.S. Marines respond to a gas attack near Verdun, France during World War One. (AP Photo, File)
World War One Centenary Timeline
NINETY SIX IN TIMELINE - In this Sept. 26, 1918 file photo, a U.S .Army 37-mm gun crew man their position during the World War One Meuse-Argonne Allied offensive in France. (AP Photo, File)
World War One Centenary Timeline
NINETY SEVEN IN TIMELINE - In this Nov. 1918 file photo, American soldiers from New York, who served on the frontline in Cambria, France, rig up a Liberty Bell to celebrate the signing of the Armistice to end World War One. (AP Photo, File)
World War One Centenary Timeline
NINETY EIGHT IN TIMELINE - In this Nov. 11, 1918 file photo, a group of people gather in front of Buckingham Palace in London, England to celebrate the signing of the Armistice that ended the fighting of World War One. (AP Photo)
World War One Centenary Timeline
NINETY NINE IN TIMELINE - In this Nov. 11, 1918 file photo, people in the streets of Paris, France, celebrate the signing of the Armistice that ended the fighting of World War One. (AP Photo, File)
World War One Centenary Timeline
ONE HUNDRED IN TIMELINE - In this 1918 file photo, American troops, near St. Mihiel, France, cheer after hearing the news that the Armistice has been signed, ending World War One. (AP Photo, File)
Most Popular
Thursday's news: What you missed while you were at work.
Get a quick digest of today's top local news stories from Arizona Daily Star.
Our weekly round-up of letters published in the Arizona Daily Star.
Don't miss Wednesday's most popular stories from Arizona Daily Star.