Voices from both sides of WWI trenches to be heard for centenary German veteran asks why soldiers went for each other 'like mad dogs?' Footage filmed in 1964 for iconic series The Great War Never-before-seen interviews with First World War soldiers revealing the true horror of going 'over the top' in battle are to be shown on television for the first time. In the heart-wrenching footage the former soldiers tell the true story of life in the trenches, and the emotions which went through the minds of the young men who gave their all in the deadly conflict. In one poignant clip, to be shown on the BBC as part of a series of programmes commemorating the Great War, one unnamed German veteran asks: 'What was it, that we soldiers stabbed each other, strangled each other, went for each other, like mad dogs?'. Poignant: In one never-before-seen interview to be screened on the BBC this former British soldier reveals the 'terror' of the First World War Questioning: In another clip, to be shown on BBC2's My Great War a German veteran asks what made soldiers fight 'like mad dogs?' Another British soldier remarks: 'As soon as you get over the top, fear has left you and it's terror'. The powerful interviews were filmed back in 1964, but were left on the cutting room floor when producers of the classic 1960s series The Great War decided to focus on the history of the conflict. Instead, the hours of unseen interviews with war veterans, stored on the original film reels, have been kept in the vaults of the Imperial War Museum for 50 years. They are now set to be broadcast for the first time in BBC Two's My Great War - which aims to show the personal experiences of those involved in battle, taking in everyday life in the trenches, dog fights in the air, fraternising with the enemy and even the actual experience of killing. Over the top: Soldiers climbing over their trench on July 1, 1916 - the first day of the Battle of the Somme, July 1, 1916 A selection of the original recordings, in their entirety, will also be made permanently available to view on the BBC iPlayer. My Great War is one of 130 programmes to be shown between next years and 2018 as part of a huge project to mark the centenary of the First World War. As part of the four-year series the BBC aims to create a "digital cenotaph" to honour the sacrifices made between 1914 and 1918. The First World War season - billed as the biggest in the corporation's history - will begin with a four-part BBC1 series Britain's Great War hosted by Jeremy Paxman.