World War One in numbers
- Published
World War One started in 1914 and ended in 1918.
Britain's entry into World War One was announced at 11pm on 4 August 1914.
65 million people around the world fought in the war. Around five million of those were British.
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.
8.5 million troops are thought to have been killed, including around 750,000 British servicemen.
21 million troops were wounded, of whom around 1.5 million were British.
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.
An estimated two million soldiers, sailors and airmen died from disease, malnutrition and other causes.
An estimated 13 million civilians were also killed.