Dan explores his great-grandfather's part in the First World War. Lieutenant-General Thomas Snow was a senior officer in the British Army who commanded troops on the first day of the Somme. It was a disaster; thousands of men died for almost no strategic gains, and his legacy would be tarnished forever. But Snow's record is more complicated than that, having proved himself a competent defensive commander earlier in the conflict. So how should we remember the men who presided over catastrophes like the Somme? Were these disasters due to a lack of preparation, failures in leadership, or both?

Dan speaks to Paul Reed, a leading historian of the First World War, to find out more about his great-granddad's wartime service and his complex legacy.

Produced by James Hickmann and edited by Dougal Patmore.

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