The Barbarian InvasionsMoral decadence did not contribute to the fall of the Roman Empire, but political instability that was most strongly reflected in a weakened army did, writes Hans Delbrck in volume 2 of History of the Art of War. The rise of sectionalism and the constant overthrowing of emperors left the empire without a secure superior authority demanding the loyalty of the legions and without the money to support them. Delbrcks celebrated work traces the collapse of