Jonathan Marcus reports on the utility of force

As the United States begins the drawdown of its forces in Afghanistan, the outcome of more than a decade of fighting against the Taliban is far from clear. The same could also be said of the conflict in Iraq, which began ten years ago this month. So is it possible for armies to win wars anymore – and have outcomes always been more complicated than just “winners” and “losers”? Jonathan Marcus begins his third and final special report on the future of warfare on the Civil War battlefield of Gettysburg in Pennsylvania…