My grandfather, a Dorset farmer, served in the cavalry during this war. He died when I was very young and my clearest memory of him was his persistent cough that plagued him in his armchair. Only later did I understand the cough to be a permanent effect of mustard gas encountered 60 years earlier on the battlefield. The Great War, as it is known, left 16 million dead and 20 million wounded. It is right to remember such tragic but important events.