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World War One in numbers

As we mark 100 years since the end of World War One, we take a look at some of the statistics from the conflict.
World War One started in 1914 and ended in 1918.
Soldiers.Getty Images
Britain's entry into World War One was announced at 11pm on 4 August 1914.
WW1 soldiers.PA
65 million people around the world fought in the war. Around five million of those were British.
Posters from World War One.Getty Images (Source: Imperial War Musuem)
Officially, you had to be 18 to sign up to the armed forces and 19 to serve abroad. However, the youngest British soldier was a 12-year-old who lied about his age.
Young soldiers.
8.5 million troops are thought to have been killed, including around 750,000 British servicemen.
Soldiers in Somme.Source: Imperial War Museum
21 million troops were wounded, of whom around 1.5 million were British.
Wounded soldiers.Getty Images (Source: Imperial War Museum)
12 million letters were delivered to the front every week. By the end of the war, two billion letters and 114 million parcels had been delivered.
World War One letters.Getty Images
An estimated two million soldiers, sailors and airmen died from disease, malnutrition and other causes.
TrenchesSource: Imperial War Museum
An estimated 13 million civilians were also killed.
House damaged during WW1.Getty Images Source: Imperial War Museum