On Armistice Day the Imperial War Museum (IWM) has released poignant portrait photos of some of the men who served in the First World War, also known as The Great War.

IWM will continue to release a new previously unseen picture every day until Aug. 14 2014, which will mark 100 years since the outbreak of the war, as part of its "Faces of the First World War" project.

It is also in the middle of four years of centenary celebrations.

More than 16 million people died as a result of the war between 1914 and 1918.

The museum acquired the portraits between 1917 and 1920, following an international public appeal which was advertised in the press as well as wartime ration books.

Some bereaved families donated their only photograph.

"The First World War Centenary is a landmark anniversary for Britain and the world. The war was a turning point in world history," Diane Lees, Director General of the IWM said.

"Everybody in the world has a connection to the First World War, either through their own family history, links to their local community or because of its long term impact on the world we live in today.

"Through projects like Faces of the First World War and the wider Centenary programme, IWM will help reconnect people with the First World War and keep the history and personal recollections of the war alive."

The full set of photos, as well as those uploaded daily, can be seen on Flickr.