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Monday marks the centenary of the start of the Third Battle of Ypres, more commonly known as Passchendaele. In the three months of fighting, half a million Allied and German soldiers were killed, wounded or went missing. Author of Epitaphs of the Great War: Passchendaele, Sarah Wearne, and chief historian at the Commonwealth War Graves Commission, Glyn Prysor, discuss the impact of a battlefront which was "one of the most horrific, one of the most frightening places in the world". The BBC's Jonny Dymond reports. (Image: Soldiers at Passchendaele. Credit: PA) (Image: Soliders in the Battle of Passchendaele.