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To mark the centenary of World War One, Mike Williams explores the meaning of sacrifice. We often talk of military sacrifice - young men and women, giving their lives for a higher cause. The \\u201cultimate sacrifice\\u201d. Countless acts of bravery on the battlefield have ended in death. Some are remembered, many are not. But is that sacrifice? Or, is there a darker side to be considered - not the willing self-sacrifice of a soldier, but a soldier sacrificed? And have we, as one philosopher suggests, misunderstood the meaning of sacrifice completely?

(Photo: A flower appears alongside the Vietnam Veterans Memorial. Credit: AFP/Getty Images)