Horse Guards Parade, London UK. 15th June 2017. 2017 marks the 100th anniversary of Passchendaele, one of the bloodiest conflicts of the First World War. A new composition is performed, written by Major Simon Haw, Director of Music Coldsteam Guards Band at Beating Retreat, the words taken from Colour Sergeant Darren Hardy’s poem, "Tyne Cot Passchendaele" which was written after a Battlefield Tour in 2013. The performance coincides with a dramatic sunset over central London. Credit: Malcolm Park / Alamy Live News.