 The fall of Vienna provided the French a huge bounty as they captured 100,000 muskets, 500 cannons, and the intact bridges across the Danube.At this critical juncture, both Tsar Alexander I and Holy Roman Emperor Francis II decided to engage Napoleon in battle, despite reservations from some of their subordinates.Napoleon sent his army north in pursuit of the Allies, but then ordered his forces to retreat so that he could feign a grave weakness.