From the Wooden Horse of Troy to the Gulf War, military history has been as much marked by chance and error as gallantry and heroism.  Here is an entertaining observation that shows how many conflicts have been decided by the caprices of weather, bad intelligence or individual incompetence. In military terms, the incident that swings a battle from victory to defeat in a moment is known as the Hinge Factor. Features:  Agincourt, Waterloo, Balaclava, The Bismarck, the Gulf War and many other crucially historic military moments.