Yesterday, June 28, marked the 100th anniversary of the assassination of the Archduke of Austria Franz Ferdinand and his wife Sophie in Sarajevo, the event that triggered the first World War.

Between 1914 and 1918 when the armistice was signed, ending what was also known as The Great War, 14 million people were killed — 5 million civilians and 9 million soldiers — including sailors and airmen from 28 countries, and at least 7 million troops were permanently disabled.

Today, we present a few photos of the fighting that has been described as unprecedented in scope and savagery.

AMERICAN OFFENSIVE

In this May 28, 1918 file photo, the 28th Infantry Regiment of the First Division, AEF goes over the top of a trench during an American offensive in the Battle of Cantigny, France.

AMERICAN TROOPS

In this 1918 file photo, American troops carrying guns with fixed bayonets climb over a sandbag revetment in France during World War One.

ARMISTICE 3

American troops near St Mihiel, France cheer after hearing the news that the Armistice has been signed, ending World War One in 1918.

ARMISTICE 4

A group of people gather in front of Buckingham Palace in London, England on November 11, 1918 to celebrate the signing of the Armistice that ended the fighting of World War One.

ARMISTICE FRANCE

People in the streets of Paris, France, celebrate the signing of the Armistice on November 11, 1918 that ended the fighting of World War One.

BELGIAN MACHINE GUN

A Belgian machine gun detachment sets up near Haelen, Belgium in August 1914. The Belgians often used dogs to draw the ammunitions cart. The Battle of Haelen was also known as the Battle of the Silver Helmets.

SERBIAN SOLDIERS

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.

CANADIAN WOUNDED

In this 1917 file photo, German soldiers bring in Canadian wounded during the Battle of Vimy, France during World War One.

FRENCH BATTERY

One of the batteries of the famous French 75s at Douaumont, France during the World War One Battle of Verdun.

FRENCH TROOPS

French troops in a shell hole during the offensive which resulted in their winning back the Chemin des Dames in France at the end of October 1917.

GERMAN BARBED WIRE

German troops cut a barbed wire fence in an unknown location in this undated photo.

GERMAN TROOPS

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.

ITALIAN TROOPS

In this 1918 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 and 23, 1918.

RUINED FRENCH TOWN

American troops from the 18th Infantry, First Division, pause in a ruined French town near St Mihiel, France in July 1918 during World War One.

SOLDIER THROWS GRENADE

An American soldier from the First Division throws a hand grenade in battle on March 15, 1918 during World War One along the Western Front in France.

US ARMY GUN CREW

A US Army 37-mm gun crew man their position during the World War One Meuse-Argonne Allied offensive in France on September 26, 1918. (PHOTOS: AP)