How best to fight a seemingly unwinnable war? That is the question that hangs over the US led Nato commitment in Afghanistan. It has prompted prolonged debate and disagreement within the Obama administration; it has also preoccupied western soldiers deployed to the Afghan frontline. Patrick Bury was sent to Sangin, the deadliest pocket of Helmand province, as a young officer with the Royal Irish Regiment. Stephen Sackur asks him now that he has left Afghanistan and the army, what lessons did he learn?
