Test your World War I knowledge in this quiz
They called it "the war to end war". An optimistic hope that soon became bitterly ironic.
World War I raged from July 1914 to November 1918 and claimed around 20 million lives; maybe 21 million were injured.
At its end, innevitably, the world was reshaped.
The last veterans passed away in the first two decades of this century, but as World War I fades beyond living memory we still live with its consequences.
How well do you know the world's first truly global, industrialised conflict and one of history's greatest tragedies?