Speaking ahead of the First World War's centenary, War Horse author Michael Morpurgo said it is important to remember the conflict.
The writer, best known for his moving novel-turned-blockbuster telling a tale of one horse's experiences during the First World War, said the war was a "seismic movement" that changed Britain from being "extraordinarily class-ridden".
He said: "All of a sudden these people were fighting the same war in the same trenches and dying in the same way, and that really hadn't happened before.
"The other thing that happened is how the role of women changed in our society.
"It was an extraordinary moment which is why it's important to remember it, because it's the young people of today who are living still with the consequences of not just that war but the war that followed it."
As the Lights Out event to remember those who fought and died in WWI happened last night ITV asked our viewers what they did to take part.
Lights on some of Britain's most famous landmarks were extinguished between 10pm and 11pm to remember those who died in WWI.