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Thanks to everybody that responded. I realise that such statistics are extremely difficult to create and that many men died, as pojnted out by bert_h and paddywack for reasons the precise nature of which will always be unknown. 'Killed in action' was considered an appropriate 'catch-all' description. The reason for my question might interest you all. I'm researching the content of public school OTC training during the years leading up to the Great War. One school's newly formed OTC group, was addressed by a retired general in 1909. He told them that: 'In the Franco-German war [1870-71] the proportion of casualties due to rifle fire was 94 per cent. The remaining six percent being divided between the artillery, the sword and the lance. The proportion was not so high now, but it could be taken at 75% or 80% so that the values of careful instruction in rifle shooting was obvious'. So that many thousands of youngsters were instructed in rifle shooting which, when it came to it, was somewhat obsolete (as pointed out by Andy1512) most casualties (presumably on both sides) were caused through machine-gun or artillery fire. Although single-shot snipers would have counted for many deaths (especially among officers) as a proportion of the total, this figure was probably low. Anyway - thanks again to all