The Hinge Factor

From the wooden horse at Troy to a harrowing photograph snapped in Vietnam, from Robert E. Lee’s lost battle plans to the evacuation of Dunkirk, world history has been shaped as much by chance and error as by courage and heroism. Time and again, invincible armies fall to weaker opponents in the face of impossible odds, when the outcome had seemed a foregone conclusion. How and why does this happen? What is it that decides the fate of battle? Writing with the style and flair that has made him an